JEE Main & Advanced Physics Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर Question Bank

done Different Measuring Instruments Total Questions - 143

• question_answer1)
  In Meter Bridge or Wheatstone bridge for measurement of resistance, the known and the unknown resistances are interchanged. The error so removed is [MNR 1988; MP PET 1995]
  A)
                                                       End correction done clear
  B)
                     Index error done clear
  C)
                     Due to temperature effect done clear
  D)
                     Random error done clear
  View Solution play_arrow

• question_answer2)
  A galvanometer can be converted into an ammeter by connecting                              [MP PMT 1987, 93; CPMT 1973, 75, 96, 2000; MP PET 1994; AFMC 1993, 95; RPET 2000; DCE 2000]
  A)
                     Low resistance in series done clear
  B)
                     High resistance in parallel done clear
  C)
                     Low resistance in parallel done clear
  D)
                     High resistance in series done clear
  View Solution play_arrow

• question_answer3)
  A cell of internal resistance \[1.5\,\Omega \] and of e.m.f. 1.5 volt balances 500 cm on a potentiometer wire. If a wire of \[15\,\Omega \] is connected between the balance point and the cell, then the balance point will shift                                                                           [MP PMT 1985]
  A)
                     To zero                            done clear
  B)
             By 500 cm done clear
  C)
                     By 750 cm done clear
  D)
                     None of the above done clear
  View Solution play_arrow

• question_answer4)
  \[{{10}^{-3}}amp\] is flowing through a resistance of \[1000\,\Omega \]. To measure the correct potential difference, the voltmeter is to be used of which the resistance should be    [MP PMT 1985]
  A)
                     \[0\,\Omega \] done clear
  B)
                                       \[500\,\Omega \] done clear
  C)
                     \[1000\,\Omega \]      done clear
  D)
             \[>>1000\,\Omega \] done clear
  View Solution play_arrow

• question_answer5)
  A galvanometer of \[100\,\Omega \] resistance gives full scale deflection when 10 mA of current is passed. To convert it into 10 A  range ammeter, the resistance of the shunt required will be                                               [MP PMT 1985]
  A)
                     \[-10\,\Omega \] done clear
  B)
                                       \[1\,\Omega \] done clear
  C)
                     \[0.1\,\Omega \]         done clear
  D)
             \[0.01\,\Omega \] done clear
  View Solution play_arrow

• question_answer6)
  \[50\,\Omega \] and \[100\,\Omega \] resistors are connected in series. This connection is connected with a battery of 2.4 volts. When a voltmeter of \[100\,\Omega \] resistance is connected across \[100\,\Omega \] resistor, then the reading of the voltmeter will be                                                                                           [MP PMT 1985]
  A)
                     1.6 V done clear
  B)
                                       1.0 V done clear
  C)
                     1.2 V done clear
  D)
             2.0 V done clear
  View Solution play_arrow

• question_answer7)
  A 2 volt battery, a \[15\,\Omega \] resistor and a potentiometer of 100 cm length, all are connected in series. If the resistance of potentiometer wire  is \[5\,\Omega \], then the potential gradient of the potentiometer wire is                                                                  [AIIMS 1982]
  A)
                     0.005 V/cm                     done clear
  B)
             0.05 V/cm done clear
  C)
                     0.02 V/cm                       done clear
  D)
             0.2 V/cm done clear
  View Solution play_arrow

• question_answer8)
  An ammeter gives full scale deflection when current of 1.0 A is passed in it. To convert it into 10 A range ammeter, the ratio of its resistance and the shunt resistance will be [MP PMT 1985]
  A)
                     1 : 9 done clear
  B)
                                       1 : 10 done clear
  C)
                     1 : 11                                 done clear
  D)
             9 : 1 done clear
  View Solution play_arrow

• question_answer9)
  By ammeter, which of the following can be measured                                                                       [MP PET 1981; DPMT 2001]
  A)
                     Electric potential          done clear
  B)
             Potential difference done clear
  C)
                     Current                            done clear
  D)
             Resistance done clear
  View Solution play_arrow

• question_answer10)
  The resistance of 1 A ammeter is \[0.018\,\Omega \]. To convert it into 10 A ammeter, the shunt resistance required will be [MP PET 1982]
  A)
                     \[0.18\,\Omega \] done clear
  B)
                                       \[0.0018\,\Omega \] done clear
  C)
                     \[0.002\,\Omega \] done clear
  D)
             \[0.12\,\Omega \] done clear
  View Solution play_arrow

• question_answer11)
  For measurement of potential difference, potentiometer is preferred in comparison to voltmeter because [MP PET 1983]
  A)
                     Potentiometer is more sensitive than voltmeter done clear
  B)
                     The resistance of potentiometer is less than voltmeter done clear
  C)
                     Potentiometer is cheaper than voltmeter done clear
  D)
                     Potentiometer does not take current from the circuit done clear
  View Solution play_arrow

• question_answer12)
  In order to pass 10% of main current through a moving coil galvanometer of 99 ohm, the resistance of the required shunt is   [MP PET 1990, 99; MP PMT 1994; RPET 2001; KCET 2003, 05]
  A)
                     \[9.9\,\Omega \] done clear
  B)
                                       \[10\,\Omega \] done clear
  C)
                     \[11\,\Omega \]          done clear
  D)
             \[9\,\Omega \] done clear
  View Solution play_arrow

• question_answer13)
  An ammeter of 5 ohm resistance can read 5 mA. If it is to be used to read 100 volts, how much resistance is to be connected in series                                           [MP PET 1991; MP PMT 1996; MP PMT 2000]
  A)
                     \[19.9995\,\Omega \]       done clear
  B)
             \[199.995\Omega \] done clear
  C)
                     \[1999.95\,\Omega \]       done clear
  D)
             \[19995\,\Omega \] done clear
  View Solution play_arrow

• question_answer14)
  The potential gradient along the length of a uniform wire is \[10\,volt/metre\]. \[B\] and \[C\] are the two points at \[30\,cm\] and \[60\,cm\] point on a meter scale fitted along the wire. The potential difference between \[B\] and \[C\] will be                                      [CPMT 1986]
  A)
                     \[3\,volt\] done clear
  B)
                                       \[0.4\,volt\] done clear
  C)
                     \[7\,volt\]                       done clear
  D)
             \[4\,volt\] done clear
  View Solution play_arrow

• question_answer15)
  \[100\,mA\] current gives a full scale deflection in a galvanometer of \[2\,\Omega \] resistance. The resistance connected with the galvanometer to convert it into a voltmeter to measure \[5\,V\]is                   [MNR 1994; UPSEAT 2000]
  A)
                     \[98\,\Omega \] done clear
  B)
                                       \[52\,\Omega \] done clear
  C)
                     \[50\,\Omega \]          done clear
  D)
             \[48\,\Omega \] done clear
  View Solution play_arrow

• question_answer16)
  When a \[12\,\Omega \] resistor is connected with a moving coil galvanometer then its deflection reduces from 50 divisions to 10 divisions. The resistance of the galvanometer is [CPMT 2002; DPMT 2003]
  A)
                     \[24\,\Omega \] done clear
  B)
                                       \[36\,\Omega \] done clear
  C)
                     \[48\,\Omega \]          done clear
  D)
             \[60\,\Omega \] done clear
  View Solution play_arrow

• question_answer17)
  A galvanometer can be used as a voltmeter by connecting a        [AFMC 1993; MP PMT 1993, 95; CBSE PMT 2004]
  A)
                     High resistance in series   done clear
  B)
             Low resistance in series done clear
  C)
                     High resistance in parallel                                            done clear
  D)
             Low resistance in parallel done clear
  View Solution play_arrow

• question_answer18)
  The tangent galvanometer, when connected in series with a standard resistance can be used as                               [MP PET 1994]
  A)
             An ammeter done clear
  B)
                     A voltmeter done clear
  C)
                     A wattmeter done clear
  D)
                     Both an ammeter and a voltmeter done clear
  View Solution play_arrow

• question_answer19)
  In Wheatstone's bridge \[P=9\]ohm, \[Q=11\]ohm, \[R=4\]ohm and \[S=6\]ohm. How much resistance must be put in parallel to the resistance \[S\] to balance the bridge                                                                                              [DPMT 1999]
  A)
                     24 ohm                            done clear
  B)
             \[\frac{44}{9}\]ohm done clear
  C)
                     26.4 ohm                         done clear
  D)
             18.7 ohm done clear
  View Solution play_arrow

• question_answer20)
  A Daniel cell is balanced on 125\[cm\] length of a potentiometer wire. Now the cell is short-circuited by a resistance 2 ohm and the balance is obtained at 100\[cm\]. The internal resistance of the Daniel cell is             [UPSEAT 2002]
  A)
                     0.5 ohm done clear
  B)
                                       1.5 ohm done clear
  C)
                     1.25 ohm                         done clear
  D)
             4/5 ohm done clear
  View Solution play_arrow

• question_answer21)
  Sensitivity of potentiometer can be increased by                                                                                                           [MP PET 1994]
  A)
                     Increasing the e.m.f. of the cell done clear
  B)
                     Increasing the length of the potentiometer wire done clear
  C)
                     Decreasing the length of the potentiometer wire done clear
  D)
                     None of the above done clear
  View Solution play_arrow

• question_answer22)
  A potentiometer is an ideal device of measuring potential difference because
  A)
                     It uses a sensitive galvanometer done clear
  B)
                     It does not disturb the potential difference it measures done clear
  C)
                     It is an elaborate arrangement done clear
  D)
                     It has a long wire hence heat developed is quickly radiated done clear
  View Solution play_arrow

• question_answer23)
  A battery of 6 volts is connected to the terminals of a three metre long wire of uniform thickness and resistance of the order of 100\[\Omega \]. The difference of potential between two points separated by 50\[cm\] on the wire will be                    [CPMT 1984; CBSE PMT 2004]
  A)
                     1 V done clear
  B)
                                       1.5 V done clear
  C)
                     2 V                                     done clear
  D)
             3 V done clear
  View Solution play_arrow

• question_answer24)
  A galvanometer of 10 ohm resistance gives full scale deflection with 0.01 ampere of current. It is to be converted into an ammeter for measuring 10 ampere current. The value of shunt resistance required will be     [MP PET 1984]
  A)
                     \[\frac{10}{999}\]ohm done clear
  B)
                                       0.1 ohm done clear
  C)
                     0.5 ohm                           done clear
  D)
             1.0 ohm done clear
  View Solution play_arrow

• question_answer25)
  A potentiometer is used for the comparison of e.m.f. of two cells \[{{E}_{1}}\] and \[{{E}_{2}}\]. For cell \[{{E}_{1}}\] the no deflection point is obtained at 20\[cm\] and for \[{{E}_{2}}\] the no deflection point is obtained at 30\[cm\]. The ratio of their e.m.f.'s will be                                                                                            [MP PET 1984]
  A)
                     2/3 done clear
  B)
                                       1/2 done clear
  C)
                     1 done clear
  D)
                                       2 done clear
  View Solution play_arrow

• question_answer26)
  Potential gradient is defined as                            [MP PET 1994]
  A)
                     Fall of potential per unit length of the wire done clear
  B)
                     Fall of potential per unit area of the wire done clear
  C)
                     Fall of potential between two ends of the wire done clear
  D)
                     Potential at any one end of the wire done clear
  View Solution play_arrow

• question_answer27)
  In an experiment of meter bridge, a null point is obtained at the centre of the bridge wire. When a resistance of 10 ohm is connected in one gap, the value of resistance in other gap is                                        [MP PET 1994]
  A)
                     \[10\,\Omega \] done clear
  B)
                                       \[5\,\Omega \] done clear
  C)
                     \[\frac{1}{5}\Omega \]     done clear
  D)
             \[500\,\Omega \] done clear
  View Solution play_arrow

• question_answer28)
  If the length of potentiometer wire is increased, then the length of the previously obtained balance point will
  A)
                     Increase done clear
  B)
                                       Decrease done clear
  C)
                     Remain unchanged    done clear
  D)
             Become two times done clear
  View Solution play_arrow

• question_answer29)
  In potentiometer a balance point is obtained, when
  A)
                     The e.m.f. of the battery becomes equal to the e.m.f. of the experimental cell done clear
  B)
                     The p.d. of the wire between the +ve end to becomes equal to the e.m.f. of the experimental cell done clear
  C)
                     The p.d. of the wire between +ve point and jockey becomes equal to the e.m.f. of the battery done clear
  D)
                     The p.d. across the potentiometer wire becomes equal to the e.m.f. of the battery done clear
  View Solution play_arrow

• question_answer30)
  In the experiment of potentiometer, at balance, there is no current in the
  A)
                     Main circuit                    done clear
  B)
                     Galvanometer circuit done clear
  C)
                     Potentiometer circuit        done clear
  D)
                     Both main and galvanometer circuits done clear
  View Solution play_arrow

• question_answer31)
  If in the experiment of Wheatstone's bridge, the positions of cells and galvanometer are interchanged, then balance points will
  A)
                     Change done clear
  B)
                     Remain unchanged done clear
  C)
                     Depend on the internal resistance of cell and resistance of galvanometer done clear
  D)
                     None of these done clear
  View Solution play_arrow

• question_answer32)
  The resistance of a galvanometer is 90 ohms. If only 10 percent of the main current may flow through the galvanometer, in which way and of what value, a resistor is to be used                                  [MP PET 1996]
  A)
                     10 ohms in series         done clear
  B)
             10 ohms in parallel done clear
  C)
                     810 ohms in series      done clear
  D)
             810 ohms in parallel done clear
  View Solution play_arrow

• question_answer33)
  Two cells when connected in series are balanced on 8m on a potentiometer. If the cells are connected with polarities of one of the cell is reversed, they balance on 2m. The ratio of e.m.f.'s of the two cells is
  A)
                     \[3:5\]                              done clear
  B)
             \[5:3\] done clear
  C)
                     \[3:4\]                              done clear
  D)
             \[4:3\] done clear
  View Solution play_arrow

• question_answer34)
  A voltmeter has a resistance of G ohms and range V volts. The value of resistance used in series to convert it into a voltmeter of range nV volts is [MP PMT 1999; MP PET 2002; DPMT 2004; MH CET 2004]
  A)
                     nG                                     done clear
  B)
             \[(n-1)G\] done clear
  C)
                     \[\frac{G}{n}\]              done clear
  D)
             \[\frac{G}{(n-1)}\] done clear
  View Solution play_arrow

• question_answer35)
  Which of the following statement is wrong     [MP PET 1994]
  A)
                     Voltmeter should have high resistance done clear
  B)
                     Ammeter should have low resistance done clear
  C)
                     Ammeter is placed in parallel across the conductor in a circuit done clear
  D)
                     Voltmeter is placed in parallel across the conductor in a circuit done clear
  View Solution play_arrow

• question_answer36)
  In the diagram shown, the reading of voltmeter is 20 V and that of ammeter is 4 A. The value of R should be (Consider given ammeter and voltmeter are not ideal)    [RPMT 1997]
  A)
                     Equal to \[5\,\Omega \] done clear
  B)
                     Greater from \[5\,\Omega \] done clear
  C)
                     Less than \[5\,\Omega \] done clear
  D)
                     Greater or less than \[5\,\Omega \] depends on the material of R done clear
  View Solution play_arrow

• question_answer37)
  A moving coil galvanometer has a resistance of \[50\,\Omega \]and gives full scale deflection for 10 mA. How could it be converted into an ammeter with a full scale deflection for 1A               [MP PMT 1996]
  A)
                     \[50/99\,\Omega \] in series                                      done clear
  B)
             \[50/99\,\Omega \] in parallel done clear
  C)
                     \[0.01\,\Omega \] in series                                         done clear
  D)
             \[0.01\,\Omega \] in parallel done clear
  View Solution play_arrow

• question_answer38)
  The current flowing through a coil of resistance 900 ohms is to be reduced by 90%. What value of shunt should be connected across the coil                                      [Roorkee 1992]
  A)
                     \[90\,\Omega \] done clear
  B)
                                       \[100\,\Omega \] done clear
  C)
                     \[9\,\Omega \]             done clear
  D)
             \[10\,\Omega \] done clear
  View Solution play_arrow

• question_answer39)
  A galvanometer of resistance \[25\,\Omega \] gives full scale deflection for a current of 10 milliampere, is to be changed into a voltmeter of range 100 V by connecting a resistance of ?R? in series with galvanometer. The value of resistance R in \[\Omega \] is                         [MP PET 1994]
  A)
                     10000                                done clear
  B)
             10025 done clear
  C)
                     975                                    done clear
  D)
             9975 done clear
  View Solution play_arrow

• question_answer40)
  In a potentiometer circuit there is a cell of e.m.f. 2 volt, a resistance of 5 ohm and a wire of uniform thickness of length 1000 cm and resistance 15 ohm. The potential gradient in the wire is                                       [MP PMT 1994]
  A)
                     \[\frac{1}{500}V/cm\]       done clear
  B)
             \[\frac{3}{2000}V/cm\] done clear
  C)
                     \[\frac{3}{5000}V/cm\]     done clear
  D)
             \[\frac{1}{1000}V/cm\] done clear
  View Solution play_arrow

• question_answer41)
  The resistance of a galvanometer is 25 ohm and it requires \[50\,\mu A\] for full deflection. The value of the shunt resistance required to convert it into an ammeter of 5 amp is                                                                        [MP PMT 1994; BHU 1997]
  A)
                     \[2.5\times {{10}^{-4}}ohm\]                                     done clear
  B)
             \[1.25\times {{10}^{-3}}ohm\] done clear
  C)
                     0.05 ohm                         done clear
  D)
             2.5 ohm done clear
  View Solution play_arrow

• question_answer42)
  Which is a wrong statement                                [MP PMT 1994]
  A)
                     The Wheatstone bridge is most sensitive when all the four resistances are of the same order done clear
  B)
                     In a balanced Wheatstone bridge, interchanging the positions of galvanometer and cell affects the balance of the bridge done clear
  C)
                     Kirchhoff's first law (for currents meeting at a junction in an electric circuit) expresses the conservation of charge done clear
  D)
                     The rheostat can be used as a potential divider done clear
  View Solution play_arrow

• question_answer43)
  A voltmeter having a resistance of 998 ohms is connected to a cell of e.m.f. 2 volt and internal resistance 2 ohm. The error in the measurement of e.m.f. will be   [MP PMT 1994]
  A)
                     \[4\times {{10}^{-1}}\,volt\] done clear
  B)
                                       \[2\times {{10}^{-3}}volt\] done clear
  C)
                     \[4\times {{10}^{-3}}volt\] done clear
  D)
             \[2\times {{10}^{-1}}volt\] done clear
  View Solution play_arrow

• question_answer44)
  For comparing the e.m.f.'s of two cells with a potentiometer, a standard cell is used to develop a potential gradient along the wires. Which of the following possibilities would make the experiment unsuccessful                                   [MP PMT 1994]
  A)
                     The e.m.f. of the standard cell is larger than the E e.m.f.'s of the two cells done clear
  B)
                     The diameter of the wires is the same and uniform throughout done clear
  C)
                     The number of wires is ten done clear
  D)
                     The e.m.f. of the standard cell is smaller than the e.m.f.'s of the two cells done clear
  View Solution play_arrow

• question_answer45)
  Which of the following is correct                               [BHU 1995]
  A)
                     Ammeter has low resistance and is connected in series done clear
  B)
                     Ammeter has low resistance and is connected in parallel done clear
  C)
                     Voltmeter has low resistance and is connected in parallel done clear
  D)
                     None of the above done clear
  View Solution play_arrow

• question_answer46)
  An ammeter with internal resistance \[90\,\Omega \] reads 1.85 A when connected in a circuit containing a battery and two resistors 700\[\Omega \] and \[410\,\Omega \] in series. Actual current will be [Roorkee 1995]
  A)
                     1.85 A                               done clear
  B)
             Greater than \[1.85\,A\] done clear
  C)
                     Less than 1.85 A           done clear
  D)
             None of these done clear
  View Solution play_arrow

• question_answer47)
  AB is a wire of uniform resistance. The galvanometer G shows no current when the length AC = 20cm and CB = 80 cm. The resistance R is equal to                [MP PMT 1995; RPET 2001]
  A)
                     \[2\,\Omega \] done clear
  B)
                     \[8\,\Omega \] done clear
  C)
                     \[20\,\Omega \] done clear
  D)
                     \[40\,\Omega \] done clear
  View Solution play_arrow

• question_answer48)
  The circuit shown here is used to compare the e.m.f. of two cells \[{{E}_{1}}\] and \[{{E}_{2}}({{E}_{1}}>{{E}_{2}})\]. The null point is at C when the galvanometer is connected to \[{{E}_{1}}\]. When the galvanometer is connected to \[{{E}_{2}}\], the null point will be  [MP PMT 1995]
  A)
                     To the left of C done clear
  B)
                     To the right of C done clear
  C)
                     At C itself done clear
  D)
                     Nowhere on AB done clear
  View Solution play_arrow

• question_answer49)
  In an experiment to measure the internal resistance of a cell by potentiometer, it is found that the balance point is at a length of 2m when the cell is shunted by a \[5\,\Omega \] resistance; and is at a length of 3m when the cell is shunted by a \[10\,\Omega \] resistance. The internal resistance of the cell is, then [Haryana CEE 1996]
  A)
                     \[1.5\,\Omega \] done clear
  B)
                                       \[10\,\Omega \] done clear
  C)
                     \[15\,\Omega \]          done clear
  D)
             \[1\,\Omega \] done clear
  View Solution play_arrow

• question_answer50)
  A potentiometer circuit shown in the figure is set up to measure e.m.f. of a cell E. As the point P moves from X to Y the galvanometer G shows deflection always in one direction, but the deflection decreases continuously until Y is reached. In order to obtain balance point between X and Y it is necessary to
  A)
                     Decreases the resistance R done clear
  B)
                     Increase the resistance R done clear
  C)
                     Reverse the terminals of battery V done clear
  D)
                     Reverse the terminals of cell E done clear
  View Solution play_arrow

• question_answer51)
  In the Wheatstone's bridge (shown in figure) \[X=Y\] and \[A>B\]. The direction of the current between ab will be
  A)
             From a to b done clear
  B)
                     From b to a done clear
  C)
                     From b to a through c done clear
  D)
                     From a to b through c done clear
  View Solution play_arrow

• question_answer52)
  The figure shows a circuit diagram of a ?Wheatstone Bridge? to measure the resistance G of the galvanometer. The relation \[\frac{P}{Q}=\frac{R}{G}\] will be satisfied only when
  A)
                     The galvanometer shows a deflection when switch S is closed done clear
  B)
                     The galvanometer shows a deflection when switch S is open done clear
  C)
                     The galvanometer shows no change in deflection whether S is open or closed done clear
  D)
                     The galvanometer shows no deflection done clear
  View Solution play_arrow

• question_answer53)
  The resistance of a galvanometer is 50 ohms and the current required to give full scale deflection is \[100\,\mu A\]. In order to convert it into an ammeter, reading upto 10A, it is necessary to put a resistance of         [MP PMT 1997; AIIMS 1999]
  A)
                     \[5\times {{10}^{-3}}\,\Omega \] in parallel        done clear
  B)
             \[5\times {{10}^{-4}}\,\Omega \] in parallel done clear
  C)
                     \[{{10}^{5}}\,\Omega \] in series                             done clear
  D)
             \[99,950\,\Omega \]in series done clear
  View Solution play_arrow

• question_answer54)
  A resistance of \[4\,\Omega \] and a wire of length 5 metres and resistance \[5\,\Omega \] are joined in series and connected to a cell of e.m.f. 10 V and internal resistance \[1\,\Omega \]. A parallel combination of two identical cells is balanced across 300 cm of the wire.  The e.m.f. E of each cell is              [MP PMT 1997]           
  A)
                                                       1.5 V done clear
  B)
                     3.0 V done clear
  C)
                     0.67 V done clear
  D)
                     1.33 V done clear
  View Solution play_arrow

• question_answer55)
  . The resistivity of a potentiometer wire is \[40\times {{10}^{-8}}\,ohm-m\] and its area of cross-section is \[8\times {{10}^{-6}}\,{{m}^{2}}\]. If 0.2 amp current is flowing through the wire, the potential gradient will be                                         [MP PMT/PET 1998]
  A)
                     \[{{10}^{-2}}\,volt/m\] done clear
  B)
                                       \[{{10}^{-1}}\,volt/m\] done clear
  C)
                     \[3.2\times {{10}^{-2}}\,volt/m\]                             done clear
  D)
             \[1\,volt/m\] done clear
  View Solution play_arrow

• question_answer56)
  If only 2% of the main current is to be passed through a galvanometer of resistance G, then the resistance of shunt will be                                                         [MP PMT/PET 1998]
  A)
                     \[\frac{G}{50}\] done clear
  B)
                                       \[\frac{G}{49}\] done clear
  C)
                     \[50\,G\]                         done clear
  D)
             \[49\,G\] done clear
  View Solution play_arrow

• question_answer57)
  The resistance of an ideal voltmeter is                                    [EAMCET (Med.) 1995; MP PMT/PET 1998; Pb. PMT 1999; CPMT 2000]
  A)
                     Zero done clear
  B)
                                       Very low done clear
  C)
                     Very large                       done clear
  D)
             Infinite done clear
  View Solution play_arrow

• question_answer58)
  A 100 V voltmeter of internal resistance \[20\,k\Omega \] in series with a high resistance R is connected to a 110 V line. The voltmeter reads 5 V, the value of R is [MP PET 1999]
  A)
                     \[210\,k\Omega \]      done clear
  B)
             \[315\,k\Omega \] done clear
  C)
                     \[420\,k\Omega \]      done clear
  D)
             \[440\,k\Omega \] done clear
  View Solution play_arrow

• question_answer59)
  Constantan wire is used in making standard resistances because its                         [MP PET 1999]
  A)
                     Specific resistance is low  done clear
  B)
                     Density is high done clear
  C)
                     Temperature coefficient of resistance is negligible done clear
  D)
                     Melting point is high done clear
  View Solution play_arrow

• question_answer60)
  The net resistance of a voltmeter should be large to ensure that                                                               [MP PMT 1999]
  A)
                     It does not get overheated done clear
  B)
                     It does not draw excessive current done clear
  C)
                     It can measure large potential difference done clear
  D)
                     It does not appreciably change the potential difference to be measured done clear
  View Solution play_arrow

• question_answer61)
  A galvanometer has resistance of \[7\,\Omega \] and gives a full scale deflection for a current of 1.0 A. How will you convert it into a voltmeter of range 10 V        [MP PMT 1999]
  A)
                     \[3\,\Omega \] in series   done clear
  B)
             \[3\,\Omega \] in parallel done clear
  C)
                     \[17\,\Omega \] in series done clear
  D)
             \[30\,\Omega \] in series done clear
  View Solution play_arrow

• question_answer62)
  A potentiometer consists of a wire of length 4 m and resistance \[10\,\Omega \]. It is connected to a cell of e.m.f. 2 V. The potential difference per unit length of the wire will be [CBSE PMT 1999; AFMC 2001]
  A)
                                                       0.5 \[V/m\]                            done clear
  B)
             \[2\,V/m\] done clear
  C)
                     \[5\,V/m\]                     done clear
  D)
             \[10\,V/m\] done clear
  View Solution play_arrow

• question_answer63)
  In a meter bridge, the balancing length from the left end (standard resistance of one ohm is in the right gap) is found to be 20 cm. The value of the unknown resistance is [CBSE PMT 1999; Pb PMT 2004]
  A)
                     \[0.8\,\Omega \] done clear
  B)
                                       \[0.5\,\Omega \] done clear
  C)
                     \[0.4\,\Omega \]         done clear
  D)
             \[0.25\,\Omega \] done clear
  View Solution play_arrow

• question_answer64)
  In the circuit shown \[P\ne R\], the reading of the galvanometer is same with switch S open or closed. Then                                                                            [IIT-JEE (Screening) 1999]
  A)
                     \[{{I}_{R}}={{I}_{G}}\] done clear
  B)
                     \[{{I}_{P}}={{I}_{G}}\]       done clear
  C)
                     \[{{I}_{Q}}={{I}_{G}}\] done clear
  D)
                     \[{{I}_{Q}}={{I}_{R}}\]       done clear
  View Solution play_arrow

• question_answer65)
  In the following Wheatstone bridge \[P/Q=R/S\]. If key K is closed, then the galvanometer will show deflection [CPMT 1999]
  A)
                     In left side done clear
  B)
                     In right side done clear
  C)
                     No deflection done clear
  D)
                     In either side done clear
  View Solution play_arrow

• question_answer66)
  A galvanometer having a resistance of 8 ohm is shunted by a wire of resistance 2 ohm. If the total current is 1 amp, the part of it passing through the shunt will be                                                                                        [CBSE PMT 1998]
  A)
                     0.25 amp                         done clear
  B)
             0.8 amp done clear
  C)
                     0.2 amp                           done clear
  D)
             0.5 amp done clear
  View Solution play_arrow

• question_answer67)
  A potentiometer wire has length 10 m and resistance \[20\,\Omega \]. A 2. 5 V battery of negligible internal resistance is connected across the wire with an \[80\,\Omega \] series resistance. The potential gradient on the wire will be                                                                      [KCET 1994]
  A)
                     \[5\times {{10}^{-5}}\,V/mm\] done clear
  B)
                                       \[2.5\times {{10}^{-4}}\,V/cm\] done clear
  C)
                     \[0.62\times {{10}^{-4}}\,V/mm\]                           done clear
  D)
             \[1\times {{10}^{-5}}\,V/mm\] done clear
  View Solution play_arrow

• question_answer68)
  An ammeter whose resistance is \[180\,\Omega \] gives full scale deflection when current is 2 mA. The shunt required to convert it into an ammeter reading 20 mA (in ohms) is                                                                       [EAMCET (Engg.) 1995]
  A)
                     18 done clear
  B)
                                       20 done clear
  C)
                     0.1                                     done clear
  D)
             10 done clear
  View Solution play_arrow

• question_answer69)
  A galvanometer whose resistance is \[120\,\Omega \] gives full scale deflection with a current of 0.05 A so that it can read a maximum current of 10 A. A shunt resistance is added in parallel with it. The resistance of the ammeter so formed is [Bihar MEE 1995]
  A)
                     \[0.06\,\Omega \] done clear
  B)
                                       \[0.006\,\Omega \] done clear
  C)
                     \[0.6\,\Omega \]         done clear
  D)
             \[6\,\Omega \] done clear
  View Solution play_arrow

• question_answer70)
  In a potentiometer experiment, the galvanometer shows no deflection when a cell is connected across 60 cm of the potentiometer wire. If the cell is shunted by a resistance of \[6\,\Omega \], the balance is obtained across 50 cm of the wire. The internal resistance of the cell is                                      [SCRA 1994]
  A)
                     \[0.5\,\Omega \] done clear
  B)
                                       \[0.6\,\Omega \] done clear
  C)
                     \[1.2\,\Omega \]         done clear
  D)
             \[1.5\,\Omega \] done clear
  View Solution play_arrow

• question_answer71)
  A voltmeter of resistance \[1000\,\Omega \] gives full scale deflection when a current of 100 mA flow through it. The shunt resistance required across it to enable it to be used as an ammeter reading 1 A at full scale deflection is    [SCRA 1994]
  A)
                     \[10000\,\Omega \] done clear
  B)
                                       \[9000\,\Omega \] done clear
  C)
                     \[222\,\Omega \] done clear
  D)
                                       \[111\,\Omega \] done clear
  View Solution play_arrow

• question_answer72)
  The resistance of 10 metre long potentiometer wire is 1ohm/meter. A cell of e.m.f. 2.2 volts and a high resistance box are connected in series to this wire. The value of resistance taken from resistance box for getting potential gradient of 2.2 millivolt/metre will be      [RPET 1997]
  A)
                     \[790\,\Omega \] done clear
  B)
                                       \[810\,\Omega \] done clear
  C)
                     \[990\,\Omega \]        done clear
  D)
             \[1000\,\Omega \] done clear
  View Solution play_arrow

• question_answer73)
  We have a galvanometer of resistance \[25\,\Omega \]. It is shunted by a \[2.5\,\Omega \] wire. The part of total current that flows through the galvanometer is given as                                               [AFMC 1998; MH CET 1999; Pb. PMT 2002]
  A)
                     \[\frac{I}{{{I}_{0}}}=\frac{1}{11}\] done clear
  B)
                                       \[\frac{I}{{{I}_{0}}}=\frac{1}{10}\] done clear
  C)
                     \[\frac{I}{{{I}_{0}}}=\frac{3}{11}\]                            done clear
  D)
             \[\frac{I}{{{I}_{0}}}=\frac{4}{11}\] done clear
  View Solution play_arrow

• question_answer74)
  In the adjoining circuit, the e.m.f. of the cell is 2 volt and the internal resistance is negligible. The resistance of the voltmeter is 80 ohm. The reading of the voltmeter will be [CPMT 1991]
  A)
                     0.80 volt done clear
  B)
                     1.60 volt done clear
  C)
                     1.33 volt done clear
  D)
                     2.00 volt done clear
  View Solution play_arrow

• question_answer75)
  If the resistivity of a potentiometer wire be \[\rho \] and area of cross-section be A, then what will be potential gradient along the wire                                                [RPET 1996]
  A)
                     \[\frac{I\rho }{A}\] done clear
  B)
                                       \[\frac{I}{A\rho }\] done clear
  C)
                     \[\frac{IA}{\rho }\]     done clear
  D)
             \[IA\rho \] done clear
  View Solution play_arrow

• question_answer76)
  A voltmeter has resistance of 2000 ohms and it can measure upto 2V. If we want to increase its range to 10 V, then the required resistance in series will be                                                                           [CPMT 1997, SCRA 1994]
  A)
                     \[2000\,\Omega \] done clear
  B)
                                       \[4000\,\Omega \] done clear
  C)
                     \[6000\,\Omega \]      done clear
  D)
             \[8000\,\Omega \] done clear
  View Solution play_arrow

• question_answer77)
  For a cell of e.m.f. 2V, a balance is obtained for 50 cm of the potentiometer wire. If the cell is shunted by a \[2\,\Omega \] resistor and the balance is obtained across 40 cm of the wire, then the internal resistance of the cell is                                 [SCRA 1998]
  A)
                     \[0.25\,\Omega \] done clear
  B)
                                       \[0.50\Omega \] done clear
  C)
                     \[0.80\,\Omega \]       done clear
  D)
             \[1.00\,\Omega \] done clear
  View Solution play_arrow

• question_answer78)
  The arrangement as shown in figure is called as                                                                                              [CPMT 1999]
  A)
                     Potential divider done clear
  B)
                     Potential adder done clear
  C)
          Potential substracter done clear
  D)
          Potential multiplier done clear
  View Solution play_arrow

• question_answer79)
  A potentiometer wire of length \[1\,m\] and resistance 10 W is connected in series with a cell of emf 2V with internal resistance 1 W and a resistance box including a resistance R.  If potential difference between the ends of the wire is 1 mV, the value of R is                                                      [KCET 1999]
  A)
          20000 W done clear
  B)
                         19989 W done clear
  C)
          10000 W                           done clear
  D)
          9989 W done clear
  View Solution play_arrow

• question_answer80)
  In a balanced Wheatstone?s network, the resistances in the arms Q and S are interchanged.  As a result of this [KCET 1999]
  A)
          Network is not balanced done clear
  B)
          Network is still balanced done clear
  C)
          Galvanometer shows zero deflection done clear
  D)
          Galvanometer and the cell must be interchanged to balance done clear
  View Solution play_arrow

• question_answer81)
  The ammeter A reads 2 A and the voltmeter V reads 20 V.  the value of resistance R is (Assuming finite resistance's of ammeter and voltmeter)                [JIPMER 1999; MP PMT 2004]
  A)
          Exactly 10 ohm done clear
  B)
          Less than 10 ohm done clear
  C)
          More than 10 ohm      done clear
  D)
          We cannot definitely say done clear
  View Solution play_arrow

• question_answer82)
  The resistance of a galvanometer coil is R.  What is the shunt resistance required to convert it into an ammeter of range 4 times                                                                    [BHU 2000]
  A)
          \[\frac{R}{5}\]               done clear
  B)
          \[\frac{R}{4}\] done clear
  C)
          \[\frac{R}{3}\]               done clear
  D)
          4 R done clear
  View Solution play_arrow

• question_answer83)
  If an ammeter is connected in parallel to a circuit, it is likely to be damaged due to excess                             [BHU 2000; BCECE 2004]
  A)
          Current done clear
  B)
          Voltage done clear
  C)
          Resistance                      done clear
  D)
          All of these done clear
  View Solution play_arrow

• question_answer84)
  In the given figure, battery E is balanced on 55 cm length of potentiometer wire but when a resistance of 10 W is connected in parallel with the battery then it balances on 50 cm length of the potentiometer wire then internal resistance r of the battery is             [DCE 2000; RPET 2000]
  A)
          1 W done clear
  B)
          3 W done clear
  C)
          10 W done clear
  D)
          5 W done clear
  View Solution play_arrow

• question_answer85)
  A galvanometer with a resistance of 12 W gives full scale deflection when a current of 3 mA is passed. It is required to convert it into a voltmeter which can read up to 18 V.  the resistance to be connected is                                                [Pb. PMT 2000]
  A)
          6000 W done clear
  B)
                         5988 W done clear
  C)
          5000 W                             done clear
  D)
          4988 W done clear
  View Solution play_arrow

• question_answer86)
  The resistance of an ideal ammeter is                    [KCET 2000]
  A)
          Infinite done clear
  B)
                         Very high done clear
  C)
          Small                                 done clear
  D)
          Zero done clear
  View Solution play_arrow

• question_answer87)
  A galvanometer of 25 W resistance can read a maximum current of 6mA.  It can be used as a voltmeter to measure a maximum of 6 V by connecting a resistance to the galvanometer.  Identify the correct choice in the given answers                                                                       [EAMCET (Med.) 2000]
  A)
          1025 W in series           done clear
  B)
          1025 W in parallel done clear
  C)
          975 W in series              done clear
  D)
          975 W in parallel done clear
  View Solution play_arrow

• question_answer88)
  A galvanometer has a resistance of 25 ohm and a maximum of 0.01 A current can be passed through it.  In order to change it into an ammeter of range 10 A, the shunt resistance required is                                             [MP PET 2000]
  A)
          5/999 ohm done clear
  B)
                         10/999 ohm done clear
  C)
          20/999 ohm                   done clear
  D)
          25/999 ohm done clear
  View Solution play_arrow

• question_answer89)
  In the circuit shown, a meter bridge is in its balanced state.  The meter bridge wire has a resistance 0.1 ohm/cm.  The value of unknown resistance X and the current drawn from the battery of negligible resistance is             [AMU (Engg.) 2000]
  A)
          6 W, 5 amp done clear
  B)
          10 W, 0.1 amp done clear
  C)
          4 W, 1.0 amp done clear
  D)
          12 W, 0.5 amp done clear
  View Solution play_arrow

• question_answer90)
  A galvanometer has 30 divisions and a sensitivity 16\[\mu A/\text{div}\text{.}\]It can be converted into a voltmeter to read 3 V by connecting                                 [Kerala PMT 2005]
  A)
          Resistance nearly 6 \[k\,\Omega \]in series done clear
  B)
          \[6\,k\,\Omega \] in parallel done clear
  C)
          \[500\,\Omega \] in series done clear
  D)
           It cannot be converted done clear
  View Solution play_arrow

• question_answer91)
  Voltmeters V1 and V2 are connected in series across a D.C. line.  V1 reads 80 volts and has a per volt resistance of 200 ohms.  V2 has a total resistance of 32 kilo ohms.  The line voltage is                                           [UPSEAT 2000]
  A)
          120 volts done clear
  B)
          160 volts done clear
  C)
          220 volts                          done clear
  D)
          240 volts done clear
  View Solution play_arrow

• question_answer92)
  A potentiometer having the potential gradient of 2 mV/cm is used to measure the difference of potential across a resistance of 10 ohm. If a length of 50 cm of the potentiometer wire is required to get the null point, the current passing through the 10 ohm resistor is (in mA)                    [AMU (Med.) 2000]
  A)
          1                                         done clear
  B)
          2 done clear
  C)
          5                                         done clear
  D)
          10 done clear
  View Solution play_arrow

• question_answer93)
  AB is a potentiometer wire of length 100 cm and its resistance is 10 ohms.  It is connected in series with a resistance R = 40 ohms and a battery of e.m.f. 2 V and negligible internal resistance.  If a source of unknown e.m.f. E is balanced by 40 cm length of the potentiometer wire, the value of E is                                              [MP PET 2001]
  A)
             0.8 V done clear
  B)
                     1.6 V done clear
  C)
          0.08 V done clear
  D)
          0.16 V done clear
  View Solution play_arrow

• question_answer94)
  An ammeter gives full deflection when a current of 2 amp. flows through it. The resistance of ammeter is 12 ohms.  If the same ammeter is to be used for measuring a maximum current of 5 amp., then the ammeter must be connected with a resistance of                                                   [MP PET 2001]
  A)
          8 ohms in series           done clear
  B)
          18 ohms in series done clear
  C)
          8 ohms in parallel        done clear
  D)
          18 ohms in parallel done clear
  View Solution play_arrow

• question_answer95)
  In a circuit 5 percent of total current passes through a galvanometer.  If resistance of the galvanometer is G then value of the shunt is                                                              [MP PET 2001]
  A)
          19 G                                  done clear
  B)
          20 G done clear
  C)
          \[\frac{G}{20}\]            done clear
  D)
          \[\frac{G}{19}\] done clear
  View Solution play_arrow

• question_answer96)
  A voltmeter having resistance of 50 × 103 ohm is used to measure the voltage in a circuit.  To increase the range of measurement 3 times the additional series resistance required is                                             [MP PET 2001]
  A)
          105 ohm done clear
  B)
                         150 k.ohm done clear
  C)
          900 k.ohm                      done clear
  D)
          9 × 106 ohm done clear
  View Solution play_arrow

• question_answer97)
  In a potentiometer experiment two cells of e.m.f. E1 and E2 are used in series and in conjunction and the balancing length is found to be 58 cm of the wire.  If the polarity of E2 is reversed, then the balancing length becomes 29 cm.  The ratio \[\frac{{{E}_{1}}}{{{E}_{2}}}\] of the e.m.f. of the two cells is                                                                                   [Kerala (Engg.) 2001]
  A)
          1 : 1                                   done clear
  B)
          2 : 1 done clear
  C)
          3 : 1                                   done clear
  D)
          4 : 1 done clear
  View Solution play_arrow

• question_answer98)
  A milliammeter of range 10 mA has a coil of resistance 1 W.  To use it as voltmeter of range 10 volt, the resistance that must be connected in series with it, will be         [KCET 2001]
  A)
          999 W                               done clear
  B)
          99 W done clear
  C)
          1000 W                             done clear
  D)
          None of these done clear
  View Solution play_arrow

• question_answer99)
  A voltmeter has a range 0-V with a series resistance R.  With a series resistance 2R, the range is 0-V¢.  The correct relation between V and V¢ is                                    [CPMT 2001]
  A)
          \[{V}'=2V\] done clear
  B)
                         \[{V}'>2V\] done clear
  C)
          \[{V}'>>2V\]                  done clear
  D)
          \[V'<2V\] done clear
  View Solution play_arrow

• question_answer100)
  The measurement of voltmeter in the following circuit is [AFMC 2001]
  A)
          2.4 V done clear
  B)
          3.4 V done clear
  C)
          4.0 V done clear
  D)
          6.0 V done clear
  View Solution play_arrow

• question_answer101)
  A 36 W galvanometer is shunted by resistance of 4W. The percentage of the total current, which passes through the galvanometer is                                                          [UPSEAT 2002]
  A)
          8 %                                    done clear
  B)
          9 % done clear
  C)
          10 %                                  done clear
  D)
          91 % done clear
  View Solution play_arrow

• question_answer102)
  An ammeter and a voltmeter of resistance R are connected in series to an electric cell of negligible internal resistance. Their readings are A and V respectively.  If another resistance R is connected in parallel with the voltmeter [EAMCET 2000; KCET 2002]
  A)
          Both A and V will increase                                           done clear
  B)
          Both A and V will decrease                                         done clear
  C)
          A will decrease and V will increase done clear
  D)
          A will increase and V will decrease done clear
  View Solution play_arrow

• question_answer103)
  A wire of length 100 cm is connected to a cell of emf 2 V and negligible internal resistance.  The resistance of the wire is 3 W.  The additional resistance required to produce a potential drop of 1 milli volt per cm is      [Kerala PET 2002]
  A)
          60 W                                  done clear
  B)
          47 W done clear
  C)
          57 W                                  done clear
  D)
          35 W done clear
  View Solution play_arrow

• question_answer104)
  A galvanometer of resistance 20 W is to be converted into an ammeter of range 1 A.  If a current of 1 mA produces full scale deflection, the shunt required for the purpose is [Kerala PET 2002]
  A)
          0.01 W done clear
  B)
                         0.05 W done clear
  C)
          0.02 W done clear
  D)
                         0.04 W done clear
  View Solution play_arrow

• question_answer105)
  There are three voltmeters of the same range but of resistances \[10000\,\Omega \], \[8000\,\Omega \] and \[4000\,\Omega \] respectively.  The best voltmeter among these is the one whose resistance is                                                                                           [Kerala PET 2002]
  A)
          10000 W done clear
  B)
                         8000 W done clear
  C)
          4000 W                             done clear
  D)
          All are equally good done clear
  View Solution play_arrow

• question_answer106)
  If an ammeter is to be used in place of a voltmeter then we must connect with the ammeter a                                                                           [AIEEE 2002; AFMC 2002]
  A)
          Low resistance in parallel                                             done clear
  B)
          High resistance in parallel done clear
  C)
          High resistance in series done clear
  D)
          Low resistance in series done clear
  View Solution play_arrow

• question_answer107)
  A 10 m long wire of 20W resistance is connected with a battery of 3 volt e.m.f. (negligible internal resistance) and a 10 W resistance is joined to it is series. Potential gradient along wire in volt per meter is                                       [MP PMT 2003]
  A)
          0.02                                   done clear
  B)
          0.3 done clear
  C)
          0.2 done clear
  D)
          1.3 done clear
  View Solution play_arrow

• question_answer108)
  A potentiometer has uniform potential gradient across it.  Two cells connected in series (i) to support each other and (ii) to oppose each other are balanced over 6m and 2m respectively on the potentiometer wire.  The e.m.f.?s of the cells are in the ratio of                                            [MP PMT 2002]
  A)
          1 : 2                                   done clear
  B)
          1 : 1 done clear
  C)
          3 : 1                                   done clear
  D)
          2 : 1 done clear
  View Solution play_arrow

• question_answer109)
  The material of wire of potentiometer is                                                                                          [MP PMT 2002]
  A)
          Copper done clear
  B)
                         Steel done clear
  C)
          Manganin done clear
  D)
          Aluminium done clear
  View Solution play_arrow

• question_answer110)
  To convert a galvanometer into a voltmeter, one should connect a                                          [CBSE PMT 2002]
  A)
          High resistance in series with galvanometer       done clear
  B)
          Low resistance in series with galvanometer done clear
  C)
          High resistance in parallel with galvanometer done clear
  D)
          Low resistance in parallel with galvanometer done clear
  View Solution play_arrow

• question_answer111)
  To convert a 800 mV range milli voltmeter of resistance 40 W into a galvanometer of 100 mA range, the resistance to be connected as shunt is                                     [CBSE PMT 2002]
  A)
          10 W                                  done clear
  B)
          20 W done clear
  C)
          30 W                                  done clear
  D)
          40 W done clear
  View Solution play_arrow

• question_answer112)
  A 100 ohm galvanometer gives full scale deflection at 10 mA.  How much shunt is required to read 100 mA [MP PET 2002]
  A)
          11.11 ohm done clear
  B)
                         9.9 ohm done clear
  C)
          1.1 ohm                           done clear
  D)
          4.4 ohm done clear
  View Solution play_arrow

• question_answer113)
  The potential difference across the 100W resistance in the following circuit is measured by a voltmeter of 900 W resistance. The percentage error made in reading the potential difference is                                      [AMU (Med.) 2002]
  A)
          \[\frac{10}{9}\] done clear
  B)
          0.1 done clear
  C)
          1.0 done clear
  D)
          10.0 done clear
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• question_answer114)
  A cell of internal resistance 3 ohm and emf 10 volt is connected to a uniform wire of length 500 cm and resistance 3 ohm.  The potential gradient in the wire is      [MP PET 2003]
  A)
          30 mV/cm done clear
  B)
                         10 mV/cm done clear
  C)
          20 mV/cm                       done clear
  D)
          4 mV/cm done clear
  View Solution play_arrow

• question_answer115)
  An ammeter of 100 W resistance gives full deflection for the current of 10?5 amp.  Now the shunt resistance required to convert it into ammeter of 1 amp. range, will be [RPET 2003]
  A)
          \[{{10}^{-4}}\] W done clear
  B)
          \[{{10}^{-5}}\] W done clear
  C)
          \[{{10}^{-3}}\] W          done clear
  D)
          \[{{10}^{-1}}\] W done clear
  View Solution play_arrow

• question_answer116)
  A galvanometer of resistance 36 W is changed into an ammeter by using a shunt of 4 W.  The fraction f0 of total current passing through the galvanometer is                   [BCECE 2003]
  A)
          \[\frac{1}{40}\]             done clear
  B)
          \[\frac{1}{4}\] done clear
  C)
          \[\frac{1}{140}\]          done clear
  D)
          \[\frac{1}{10}\] done clear
  View Solution play_arrow

• question_answer117)
  If the ammeter in the given circuit reads 2 A, the resistance R is                                                 [Orissa JEE 2003]
  A)
          1 ohm done clear
  B)
          2 ohm done clear
  C)
          3 ohm done clear
  D)
          4 ohm done clear
  View Solution play_arrow

• question_answer118)
  A 50 ohm galvanometer gets full scale deflection when a current of 0.01 A passes through the coil.  When it is converted to a 10 A ammeter, the shunt resistance is [Orissa JEE 2003]
  A)
           0.01 W done clear
  B)
                         0.05 W done clear
  C)
          2000 W done clear
  D)
                         5000 W done clear
  View Solution play_arrow

• question_answer119)
  Resistance in the two gaps of a meter bridge are 10 ohm and 30 ohm respectively. If the resistances are interchanged the balance point shifts by                                  [Orissa JEE 2003]
  A)
          33.3 cm done clear
  B)
                         66.67cm done clear
  C)
          25 cm                                done clear
  D)
          50 cm done clear
  View Solution play_arrow

• question_answer120)
  A potentiometer has uniform potential gradient. The specific resistance of the material of the potentiometer wire is 10?7 ohm?meter and the current passing through it is 0.1 ampere; cross-section of the wire is 10?6 m2.  The potential gradient along the potentiometer wire is             [KCET 2003]
  A)
          \[{{10}^{-4}}\] V/m done clear
  B)
          \[{{10}^{-6}}\] V/m done clear
  C)
          \[{{10}^{-2}}\] V/m     done clear
  D)
          \[{{10}^{-8}}\] V/m done clear
  View Solution play_arrow

• question_answer121)
  Two resistances of 400 W and 800 W are connected in series with 6 volt battery of negligible internal resistance.  A voltmeter of resistance 10,000 W is used to measure the potential difference across 400 W.  The error in the measurement of potential difference in volts approximately is                                                  [EAMCET 2003]
  A)
          0.01                                   done clear
  B)
          0.02 done clear
  C)
          0.03                                   done clear
  D)
          0.05 done clear
  View Solution play_arrow

• question_answer122)
  A galvanometer, having a resistance of 50 W gives a full scale deflection for a current of 0.05 A. The length in meter of a resistance wire of area of cross-section 2.97× 10?2 cm2 that can be used to convert the galvanometer into an ammeter which can read a maximum of 5 A current is (Specific resistance of the wire = 5 × \[{{10}^{-7}}\]Wm)                                          [EAMCET 2003]
  A)
          9                                         done clear
  B)
          6 done clear
  C)
          3                                         done clear
  D)
          1.5 done clear
  View Solution play_arrow

• question_answer123)
  An ammeter reads upto 1 ampere.  Its internal resistance is 0.81 ohm.  To increase the range to 10 A the value of the required shunt is                                                            [AIEEE 2003]
  A)
          0.09 W done clear
  B)
                         0.03 W done clear
  C)
          0.3 W                                done clear
  D)
          0.9 W done clear
  View Solution play_arrow

• question_answer124)
  The length of a wire of a potentiometer is 100 cm, and the emf of its standard cell is E volt.  It is employed to measure the e.m.f of a battery whose internal resistance is 0.5 W.  If the balance point is obtained at l = 30 cm from the positive end, the e.m.f. of the battery is                              [AIEEE 2003]
  A)
          \[\frac{30E}{100}\] done clear
  B)
          \[\frac{30E}{100.5}\] done clear
  C)
          \[\frac{30E}{(100-0.5)}\] done clear
  D)
          \[\frac{30(E-0.5i)}{100}\], where i is the current in the potentiometer done clear
  View Solution play_arrow

• question_answer125)
  Resistance of 100 cm long potentiometer wire is 10W, it is connected to a battery (2 volt) and a resistance R in series. A source of 10 mV gives null point at 40 cm length, then external resistance R is                                                 [MP PMT 2003]
  A)
          490 W                               done clear
  B)
          790 W done clear
  C)
          590 W                               done clear
  D)
          990 W done clear
  View Solution play_arrow

• question_answer126)
  The e.m.f. of a standard cell balances across 150 cm length of a wire of potentiometer. When a resistance of \[2\,\Omega \] is connected as a shunt with the cell, the balance point is obtained at \[100\,cm\]. The internal resistance of the cell is                                                                                            [MP PET 1993]
  A)
                                                       \[0.1\,\Omega \]                 done clear
  B)
             \[1\,\Omega \] done clear
  C)
                     \[2\,\Omega \] done clear
  D)
                                       \[0.5\,\Omega \] done clear
  View Solution play_arrow

• question_answer127)
  What is the reading of voltmeter in the following figure [MP PMT 2004]
  A)
                     3 V done clear
  B)
                     2 V done clear
  C)
                     5 V done clear
  D)
                     4 V done clear
  View Solution play_arrow

• question_answer128)
  The current flowing in a coil of resistance 90 W is to be reduced by 90%. What value of resistance should be connected in parallel with it                                                        [MP PMT 2004]
  A)
                     9 W done clear
  B)
                     90 W done clear
  C)
                     1000 W                             done clear
  D)
             10 W done clear
  View Solution play_arrow

• question_answer129)
  The maximum current that can be measured by a galvanometer of resistance 40 W is 10 mA. It is converted into a voltmeter that can read upto 50 V. The resistance to be connected in series with the galvanometer is ... (in ohm) [KCET 2004]
  A)
          5040 done clear
  B)
                         4960 done clear
  C)
          2010                                  done clear
  D)
          4050 done clear
  View Solution play_arrow

• question_answer130)
  For the post office box arrangement to determine the value of unknown resistance the unknown resistance should be connected between                            [IIT-JEE (Screening) 2004]
  A)
          B and C done clear
  B)
          C and D done clear
  C)
          A and D done clear
  D)
          B1 and C1 done clear
  View Solution play_arrow

• question_answer131)
  A galvanometer of 50 ohm resistance has 25 divisions. A current of 4 ´ 10?4 ampere gives a deflection of one division. To convert this galvanometer into a voltmeter having a range of 25 volts, it should be connected with a resistance of [CBSE PMT 2004]
  A)
          2500 W as a shunt        done clear
  B)
          2450 W as a shunt done clear
  C)
          2550 W in series           done clear
  D)
          2450 W in series done clear
  View Solution play_arrow

• question_answer132)
  In a metre bridge experiment null point is obtained at 20 cm from one end of the wire when resistance X is balanced against another resistance Y. If X < Y, then where will be the new position of the null point from the same end, if one decides to balance a resistance of 4X against Y                                                                                                                                                                      [AIEEE 2004]
  A)
          50 cm done clear
  B)
                         80 cm done clear
  C)
          40 cm                                done clear
  D)
          70 cm done clear
  View Solution play_arrow

• question_answer133)
  In the circuit given, the correct relation to a balanced Wheatstone bridge is                                         [Orissa PMT 2004]
  A)
          \[\frac{P}{Q}=\frac{R}{S}\] done clear
  B)
          \[\frac{P}{Q}=\frac{S}{R}\] done clear
  C)
          \[\frac{P}{R}=\frac{S}{Q}\] done clear
  D)
          None of these done clear
  View Solution play_arrow

• question_answer134)
  A galvanometer coil of resistance 50 W, show full deflection of \[100\mu A\]. The shunt resistance to be added to the galvanometer, to work as an ammeter of range 10 mA is [Pb PET 2000]
  A)
          5 W in parallel done clear
  B)
                        0.5 W in series done clear
  C)
          5 W in series                  done clear
  D)
          0.5 W in parallel done clear
  View Solution play_arrow

• question_answer135)
  In given figure, the potentiometer wire AB has a resistance of 5 W and length 10 m. The balancing length AM for the emf of 0.4 V is                                                              [Pb. PET 2001]
  A)
          0.4 m done clear
  B)
          4 m done clear
  C)
          0.8 m done clear
  D)
          8 m done clear
  View Solution play_arrow

• question_answer136)
  A potentiometer consists of a wire of length 4 m and resistance 10 W. It is connected to cell of emf 2 V. The potential difference per unit length of the wire will be [Pb. PET 2002]
  A)
          0.5 V/m done clear
  B)
                         10 V/m done clear
  C)
          2 V/m                               done clear
  D)
          5 V/m done clear
  View Solution play_arrow

• question_answer137)
  A voltmeter essentially consists of                                                           [UPSEAT 2004]
  A)
          A high resistance, in series with a galvanometer done clear
  B)
          A low resistance, in series with a galvanometer done clear
  C)
          A high resistance in parallel with a galvanometer done clear
  D)
          A low resistance in parallel with a galvanometer done clear
  View Solution play_arrow

• question_answer138)
  In a potentiometer experiment the balancing with a cell is at length 240 cm. On shunting the cell with a resistance of 2 W, the balancing length becomes 120 cm. The internal resistance of the cell is                                     [DCE 2002; AIEEE 2005]
  A)
          4 W                                    done clear
  B)
          2 W done clear
  C)
          1 W                                    done clear
  D)
          0.5 W done clear
  View Solution play_arrow

• question_answer139)
  With a potentiometer null point were obtained at 140 cm and 180 cm with cells of emf 1.1 V and one unknown X volts. Unknown emf is                                                               [DCE 2002]
  A)
          1.1 V                                 done clear
  B)
          1.8 V done clear
  C)
          2.4 V                                 done clear
  D)
          1.41 V done clear
  View Solution play_arrow

• question_answer140)
  A moving coil galvanometer of resistance 100W is used as an ammeter using a resistance 0.1W.  The maximum deflection current in the galvanometer is 100mA. Find the minimum current in the circuit so that the ammeter shows maximum deflection                                 [IIT-JEE (Screening) 2005]
  A)
             100.1 mA                                done clear
  B)
             1000.1 mA done clear
  C)
          10.01 mA                         done clear
  D)
          1.01 mA done clear
  View Solution play_arrow

• question_answer141)
  Two resistances are connected in two gaps of a metre bridge. The balance point is 20 cm from the zero end. A resistance of 15 ohms is connected in series with the smaller of the two. The null point shifts to 40 cm. The value of the smaller resistance in ohms is                                                     [KCET 2005]
  A)
          3                                         done clear
  B)
          6 done clear
  C)
          9                                         done clear
  D)
          12 done clear
  View Solution play_arrow

• question_answer142)
  If resistance of voltmeter is 10000W and resistance of ammeter is 2W then find R when voltmeter reads 12V and ammeter reads 0.1 A                                                   [BCECE 2005]
  A)
          118 W                               done clear
  B)
          120 W done clear
  C)
          124 W                               done clear
  D)
          114W done clear
  View Solution play_arrow

• question_answer143)
  Potentiometer wire of length 1 m is connected in series with 490\[\Omega \] resistance and 2V battery. If 0.2 mV/cm is the potential gradient, then resistance of the potentiometer wire is                                                   [DCE 2005]
  A)
          4.9\[\Omega \]            done clear
  B)
          7.9\[\Omega \] done clear
  C)
   5.9\[\Omega \]                done clear
  D)
   6.9\[\Omega \] done clear
  View Solution play_arrow