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

done Kirchhoff's Law, Cells Total Questions - 85

• question_answer1)
  The battery \[E\] has an \[e.m.f.\] of \[2\,volt\]. If the galvanometer \[G\] reads zero, then the value of the resistance \[X\] in ohm is [NCERT 1990; AIEEE 2005]
  A)
                     10 done clear
  B)
                     100 done clear
  C)
                     500 done clear
  D)
                     200 done clear
  View Solution play_arrow

• question_answer2)
  The magnitude and direction of the current in the circuit shown will be                                  [CPMT 1986, 88]
  A)
                     \[\frac{7}{3}\]A from a to b through e done clear
  B)
                     \[\frac{7}{3}\]A from b to a through e done clear
  C)
                     1A from b to a through e done clear
  D)
                     1A from a to b through e             done clear
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• question_answer3)
  A cell of \[e.m.f.\] \[1.5\,V\] having a finite internal resistance is connected to a load resistance of \[2\,\Omega \]. For maximum power transfer the internal resistance of the cell should be [BIT 1988]
  A)
                     4 ohm                               done clear
  B)
             0.5 ohm done clear
  C)
                     2 ohm                               done clear
  D)
             None of these done clear
  View Solution play_arrow

• question_answer4)
  By a cell a current of 0.9 A flows through 2 ohm resistor and 0.3 A through 7 ohm resistor. The internal resistance of the cell is                                                                            [KCET 2003]
  A)
                     \[0.5\,\Omega \] done clear
  B)
             \[1.0\,\Omega \] done clear
  C)
                     \[1.2\,\Omega \]         done clear
  D)
             \[2.0\,\Omega \] done clear
  View Solution play_arrow

• question_answer5)
  The e.m.f. of a cell is E volts and internal resistance is \[r\] ohm. The resistance in external circuit is also\[r\] ohm. The p.d. across the cell will be                     [CPMT 1985; NCERT 1973]
  A)
                     E/2 done clear
  B)
                                       2E done clear
  C)
                     4E                                       done clear
  D)
             E/4 done clear
  View Solution play_arrow

• question_answer6)
  A cell of e.m.f. \[E\] is connected with an external resistance \[R\], then p.d. across cell is \[V\].  The internal resistance of cell will be                [MNR 1987; Kerala PMT 2002; MP PMT 2002]
  A)
                     \[\frac{(E-V)R}{E}\] done clear
  B)
                                       \[\frac{(E-V)R}{V}\] done clear
  C)
                     \[\frac{(V-E)R}{V}\]    done clear
  D)
             \[\frac{(V-E)R}{E}\] done clear
  View Solution play_arrow

• question_answer7)
  Two cells, e.m.f. of each is \[E\] and internal resistance \[r\] are connected in parallel between the resistance \[R\]. The maximum energy given to the resistor will be, only when [MNR 1988; MP PET 2000; UPSEAT 2001]
  A)
                     \[R=r/2\] done clear
  B)
                                       \[R=r\] done clear
  C)
                     \[R=2r\]                           done clear
  D)
             \[R=0\] done clear
  View Solution play_arrow

• question_answer8)
  Kirchhoff's first law \[i.e.\] \[\Sigma i=0\] at a junction is based on the law of conservation of      [CBSE PMT 1997; AIIMS 2000; MP PMT 2002; RPMT 2001; DPMT 2005]
  A)
                     Charge done clear
  B)
                                       Energy done clear
  C)
                     Momentum                   done clear
  D)
             Angular momentum done clear
  View Solution play_arrow

• question_answer9)
  Kirchhoff's second law is based on the law of conservation of [RPET 2003; MH CET 2001]
  A)
                     Charge done clear
  B)
                                       Energy done clear
  C)
                     Momentum                   done clear
  D)
             Sum of mass and energy done clear
  View Solution play_arrow

• question_answer10)
  The figure below shows currents in a part of electric circuit. The current i is                          [CPMT 1981; RPET 1999]
  A)
                     1.7 amp done clear
  B)
                     3.7 amp done clear
  C)
                     1.3 amp done clear
  D)
                     1 amp done clear
  View Solution play_arrow

• question_answer11)
  The terminal potential difference of a cell is greater than its e.m.f. when it is
  A)
                     Being discharged done clear
  B)
                     In open circuit done clear
  C)
                     Being charged done clear
  D)
                     Being either charged or discharged done clear
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• question_answer12)
  In the circuit shown, potential difference between X and Y will be           
  A)
                     Zero done clear
  B)
                     20 V done clear
  C)
                     60 V done clear
  D)
                     120 V done clear
  View Solution play_arrow

• question_answer13)
  In the above question, potential difference across the \[40\,\Omega \] resistance will be
  A)
                     Zero done clear
  B)
                                       80 V done clear
  C)
                     40 V                                   done clear
  D)
             120 V done clear
  View Solution play_arrow

• question_answer14)
  In the circuit shown, A and V are ideal ammeter and voltmeter respectively. Reading of the voltmeter will be
  A)
                     2 V done clear
  B)
                     1 V done clear
  C)
                     0.5 V done clear
  D)
                     Zero done clear
  View Solution play_arrow

• question_answer15)
  When a resistance of 2ohm is connected across the terminals of a cell, the current is 0.5 amperes. When the resistance is increased to 5 ohm, the current is 0.25 amperes. The internal resistance of the cell is                                   [MP PMT 1996]
  A)
                     \[0.5\,ohm\] done clear
  B)
                                       \[1.0\,ohm\] done clear
  C)
                     \[1.5\,ohm\]                 done clear
  D)
             \[2.0\,ohm\] done clear
  View Solution play_arrow

• question_answer16)
  The terminal potential difference of a cell when short-circuited is (\[E\] = E.M.F. of the cell)
  A)
                     \[E\] done clear
  B)
                                       \[E/2\] done clear
  C)
                     Zero                                  done clear
  D)
             \[E/3\] done clear
  View Solution play_arrow

• question_answer17)
  A primary cell has an e.m.f. of 1.5 volts, when short-circuited it gives a current of 3 amperes. The internal resistance of the cell is                                                               [CPMT 1976, 83]
  A)
                     4.5\[ohm\] done clear
  B)
                                       2\[ohm\] done clear
  C)
                     0.5\[ohm\]                     done clear
  D)
             1/4.5\[ohm\] done clear
  View Solution play_arrow

• question_answer18)
  A 50V battery is connected across a 10 ohm resistor. The current is 4.5 amperes. The internal resistance of the battery is                                                 [CPMT 1985; BHU 1997; Pb. PMT 2001]
  A)
                     Zero done clear
  B)
                                       0.5 ohm done clear
  C)
                     1.1 ohm done clear
  D)
             5.0 ohm done clear
  View Solution play_arrow

• question_answer19)
  The potential difference in open circuit for a cell is 2.2 volts. When a 4 ohm resistor is connected between its two electrodes the potential difference becomes 2 volts. The internal resistance of the cell will be                                             [MP PMT 1984; SCRA 1994; CBSE PMT 2002]
  A)
                     1 ohm done clear
  B)
                                       0.2 ohm done clear
  C)
                     2.5 ohm                           done clear
  D)
             0.4 ohm done clear
  View Solution play_arrow

• question_answer20)
  A new flashlight cell of e.m.f. 1.5 volts gives a current of 15 amps, when connected directly to an ammeter of resistance \[0.04\,\Omega \]. The internal resistance of cell is [MP PET 1994]
  A)
                     \[0.04\,\Omega \] done clear
  B)
                                       \[0.06\,\Omega \] done clear
  C)
                     \[0.10\,\Omega \]       done clear
  D)
             \[10\,\Omega \] done clear
  View Solution play_arrow

• question_answer21)
  A cell whose e.m.f. is 2 V and internal resistance is \[0.1\,\Omega \], is connected with a resistance of\[3.9\,\Omega \]. The voltage across the cell terminal will be [CPMT 1990; MP PET 1993; CBSE PMT 1999; AFMC 1999; Pb. PMT 2000; AIIMS 2001]
  A)
                     \[0.50\,V\] done clear
  B)
                                       \[1.90\,V\] done clear
  C)
                     \[1.95\,V\]                     done clear
  D)
             \[2.00\,V\] done clear
  View Solution play_arrow

• question_answer22)
  The reading of a high resistance voltmeter when a cell is connected across it is 2.2 V. When the terminals of the cell are also connected to a resistance of \[5\,\Omega \] the voltmeter reading drops to 1.8 V. Find the internal resistance of the cell                                                                                                            [KCET 2003; MP PMT 2003]
  A)
                     \[1.2\,\Omega \] done clear
  B)
                                       \[1.3\,\Omega \] done clear
  C)
                     \[1.1\,\Omega \]         done clear
  D)
             \[1.4\,\Omega \] done clear
  View Solution play_arrow

• question_answer23)
  When cells are connected in parallel, then                                                                                                [MNR 1983]
  A)
                     The current decreases      done clear
  B)
             The current increases done clear
  C)
                     The e.m.f. increases  done clear
  D)
             The e.m.f. decreases done clear
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• question_answer24)
  The internal resistance of a cell depends on
  A)
                     The distance between the plates done clear
  B)
                     The area of the plates immersed done clear
  C)
                     The concentration of the electrolyte done clear
  D)
                     All the above done clear
  View Solution play_arrow

• question_answer25)
  n identical cells each of e.m.f. E and internal resistance r are connected in series. An external resistance R is connected in series to this combination. The current through R is [DPMT 2002]
  A)
                     \[\frac{nE}{R+nr}\] done clear
  B)
                                       \[\frac{nE}{nR+r}\] done clear
  C)
                     \[\frac{E}{R+nr}\]        done clear
  D)
             \[\frac{nE}{R+r}\] done clear
  View Solution play_arrow

• question_answer26)
  A cell of internal resistance r is connected to an external resistance R. The current will be maximum in R, if                                                                                              [CPMT 1982]
  A)
                     \[R=r\] done clear
  B)
                                       \[R<r\] done clear
  C)
                     \[R>r\]                             done clear
  D)
             \[R=r/2\] done clear
  View Solution play_arrow

• question_answer27)
  To get the maximum current from a parallel combination of n identical cells each of internal resistance r in an external resistance R, when                                                       [DPMT 1999]
  A)
                     \[R>>r\] done clear
  B)
                                       \[R<<r\] done clear
  C)
                     \[R=r\]                             done clear
  D)
             None of these done clear
  View Solution play_arrow

• question_answer28)
  Two identical cells send the same current in \[2\,\Omega \] resistance, whether connected in series or in parallel. The internal resistance of the cell should be                                                                 [NCERT 1982; Kerala PMT 2002]
  A)
                     \[1\,\Omega \] done clear
  B)
                                       \[2\,\Omega \] done clear
  C)
                     \[\frac{1}{2}\Omega \]     done clear
  D)
             \[2.5\,\Omega \] done clear
  View Solution play_arrow

• question_answer29)
  The internal resistances of two cells shown are \[0.1\,\Omega \] and \[0.3\,\Omega \]. If \[R=0.2\,\Omega \], the potential difference across the cell
  A)
                     B will be zero done clear
  B)
                     A will be zero done clear
  C)
                     A and B will be 2V done clear
  D)
                     A will be \[>2V\] and B will be \[<2V\] done clear
  View Solution play_arrow

• question_answer30)
  A torch battery consisting of two cells of 1.45 volts and an internal resistance \[0.15\,\Omega \], each cell sending currents through the filament of the lamps having resistance 1.5ohms. The value of current will be          [MP PET 1994]
  A)
                     16.11 amp                      done clear
  B)
             1.611 amp done clear
  C)
                     0.1611 amp                    done clear
  D)
             2.6 amp done clear
  View Solution play_arrow

• question_answer31)
  The electromotive force of a primary cell is 2 volts. When it is short-circuited it gives a current of 4 amperes. Its internal resistance in ohms is                                                 [MP PET 1995]
  A)
                     0.5 done clear
  B)
                                       5.0 done clear
  C)
                     2.0                                     done clear
  D)
             8.0 done clear
  View Solution play_arrow

• question_answer32)
  The figure shows a network of currents. The magnitude of currents is shown here. The current i will be                                                                                          [MP PMT 1995]
  A)
                     3 A done clear
  B)
                     13 A done clear
  C)
                     23 A done clear
  D)
                     ? 3 A done clear
  View Solution play_arrow

• question_answer33)
  A battery of e.m.f. E and internal resistance r is connected to a variable resistor R as shown here. Which one of the following is true                                                         [MP PMT 1995]
  A)
                     Potential difference across the terminals of the battery is maximum when R = r done clear
  B)
                     Power delivered to the resistor is maximum when R = r done clear
  C)
                     Current in the circuit is maximum when R = r done clear
  D)
                     Current in the circuit is maximum when \[R>>r\] done clear
  View Solution play_arrow

• question_answer34)
  A dry cell has an e.m.f. of 1.5 V and an internal resistance of \[0.05\,\Omega \]. The maximum current obtainable from this cell for a very short time interval is                                                                  [Haryana CEE 1996]
  A)
                     30 A done clear
  B)
                                       300 A done clear
  C)
                     3 A                                     done clear
  D)
             0.3 A done clear
  View Solution play_arrow

• question_answer35)
  Consider the circuit given here with the following parameters            E.M.F. of the cell = 12 V. Internal resistance of the cell \[=2\,\Omega \]. Resistance \[R=4\,\Omega \]            Which one of the following statements in true
  A)
                     Rate of energy loss in the source is = 8 W done clear
  B)
                     Rate of energy conversion in the source is 16 W done clear
  C)
                     Power output in is = 8 W done clear
  D)
                     Potential drop across R is = 16 V done clear
  View Solution play_arrow

• question_answer36)
  A current of two amperes is flowing through a cell of e.m.f. 5 volts and internal resistance 0.5 ohm from negative to positive electrode. If the potential of negative electrode is 10V, the potential of positive electrode will be                                                                                          [MP PMT 1997]
  A)
                     5 V                                     done clear
  B)
             14 V done clear
  C)
                     15 V                                   done clear
  D)
             16 V done clear
  View Solution play_arrow

• question_answer37)
  100 cells each of e.m.f. 5 V and internal resistance 1 ohm are to be arranged so as to produce maximum current in a 25 ohms resistance. Each row is to contain equal number of cells. The number of rows should be              [MP PMT 1997]
  A)
                     2 done clear
  B)
                                       4 done clear
  C)
                     5                                         done clear
  D)
             10 done clear
  View Solution play_arrow

• question_answer38)
  The current in the arm CD of the circuit will be                                      [MP PMT/PET 1998; MP PMT 2000; DPMT 2000]
  A)
                     \[{{i}_{1}}+{{i}_{2}}\] done clear
  B)
                     \[{{i}_{2}}+{{i}_{3}}\] done clear
  C)
                     \[{{i}_{1}}+{{i}_{3}}\] done clear
  D)
                     \[{{i}_{1}}-{{i}_{2}}+{{i}_{3}}\] done clear
  View Solution play_arrow

• question_answer39)
  When a resistance of 2 ohm is connected across the terminals of a cell, the current is 0.5 A. When the resistance is increased to 5 ohm, the current is 0.25 A. The e.m.f. of the cell is                                 [MP PET 1999, 2000; Pb. PMT 2002; MP PMT 2000]
  A)
                     1.0 V done clear
  B)
                                       1.5 V done clear
  C)
                     2.0 V                                 done clear
  D)
             2.5 V done clear
  View Solution play_arrow

• question_answer40)
  Two non-ideal identical batteries are connected in parallel. Consider the following statements                                   [MP PMT 1999]            (i)   The equivalent e.m.f. is smaller than either of the two e.m.f.s            (ii)  The equivalent internal resistance is smaller than either of the two internal resistances
  A)
                     Both (i) and (ii) are correct done clear
  B)
                     (i) is correct but (ii) is wrong done clear
  C)
                     (ii) is correct but (i) is wrong done clear
  D)
                     Both (i) and (ii) are wrong done clear
  View Solution play_arrow

• question_answer41)
  If six identical cells each having an e.m.f. of 6V are connected in parallel, the e.m.f. of the combination is                                   [EAMCET (Med.) 1995; Pb. PMT 1999; CPMT 2000]
  A)
                     1 V done clear
  B)
                                       36 V done clear
  C)
                     \[\frac{1}{6}V\]            done clear
  D)
             6 V done clear
  View Solution play_arrow

• question_answer42)
  Consider the circuit shown in the figure. The current \[{{I}_{3}}\] is equal to                                        [AMU 1995]
  A)
                     5 amp done clear
  B)
                     3 amp done clear
  C)
                     \[-3\,amp\] done clear
  D)
                     \[-5/6\,amp\] done clear
  View Solution play_arrow

• question_answer43)
  If \[{{V}_{AB}}=4V\] in the given figure, then resistance X will be [RPET 1997]
  A)
                                                       \[5\,\Omega \] done clear
  B)
                     \[10\,\Omega \] done clear
  C)
                     \[15\,\Omega \] done clear
  D)
                     \[20\,\Omega \] done clear
  View Solution play_arrow

• question_answer44)
  Two resistances \[{{R}_{1}}\] and \[{{R}_{2}}\] are joined as shown in the figure to two batteries of e.m.f. \[{{E}_{1}}\] and \[{{E}_{2}}\]. If \[{{E}_{2}}\] is short-circuited, the current through \[{{R}_{1}}\] is           [NDA 1995]
  A)
                     \[{{E}_{1}}/{{R}_{1}}\] done clear
  B)
                     \[{{E}_{2}}/{{R}_{1}}\] done clear
  C)
                     \[{{E}_{2}}/{{R}_{2}}\] done clear
  D)
                     \[{{E}_{1}}/({{R}_{2}}+{{R}_{1}})\] done clear
  View Solution play_arrow

• question_answer45)
  A storage battery has e.m.f. 15 volts and internal resistance 0.05 ohm. Its terminal voltage when it is delivering 10 ampere is                                                                       [JIPMER 1997]
  A)
                     30 volts done clear
  B)
                                       1.00 volts done clear
  C)
                     14.5 volts                        done clear
  D)
             15.5 volts done clear
  View Solution play_arrow

• question_answer46)
  The number of dry cells, each of e.m.f. 1.5 volt and internal resistance 0.5 ohm that must be joined in series with a resistance of 20 ohm so as to send a current of 0.6 ampere through the circuit is                                                [SCRA 1998]
  A)
                     2 done clear
  B)
                                       8 done clear
  C)
                     10                                       done clear
  D)
             12 done clear
  View Solution play_arrow

• question_answer47)
  Emf is most closely related to                                     [DCE 1999]
  A)
             Mechanical force                done clear
  B)
             Potential difference done clear
  C)
             Electric field                           done clear
  D)
             Magnetic field done clear
  View Solution play_arrow

• question_answer48)
  For driving a current of 2 A for 6 minutes in a circuit, 1000 J of work is to be done.  The e.m.f. of the source in the circuit is                                                                                          [CPMT 1999]
  A)
             1.38 V done clear
  B)
                                       1.68 V done clear
  C)
             2.04 V                                       done clear
  D)
             3.10 V done clear
  View Solution play_arrow

• question_answer49)
  Two batteries of e.m.f. 4V and 8 V with internal resistances 1 W and 2 W are connected in a circuit with a resistance of 9 W as shown in figure.  The current and potential difference between the points P and Q are                    [AFMC 1999]
  A)
             \[\frac{1}{3}A\,\,\text{and }\,3V\] done clear
  B)
             \[\frac{1}{6}A\,\,\text{and}\,\text{ }4V\] done clear
  C)
             \[\frac{1}{9}A\,\,\text{and}\,\text{ 9}V\] done clear
  D)
             \[\frac{1}{2}A\,\,\text{and}\,\,12V\] done clear
  View Solution play_arrow

• question_answer50)
  In the shown circuit, what is the potential difference across A and B                                        [AIIMS 1999]
  A)
             50 V done clear
  B)
             45 V done clear
  C)
             30 V done clear
  D)
             20 V done clear
  View Solution play_arrow

• question_answer51)
  Four identical cells each having an electromotive force (e.m.f.) of 12V, are connected in parallel. The resultant electromotive force (e.m.f.) of the combination is                                                                                              [CPMT 1999]
  A)
             48 V                                          done clear
  B)
             12 V done clear
  C)
             4 V done clear
  D)
             3 V done clear
  View Solution play_arrow

• question_answer52)
  Electromotive force is the force, which is able to maintain a constant                                      [Pb. PMT 1999]
  A)
             Current done clear
  B)
                                       Resistance done clear
  C)
             Power                                      done clear
  D)
             Potential difference done clear
  View Solution play_arrow

• question_answer53)
  A cell of emf 6 V and resistance 0.5 ohm is short circuited.  The current in the cell is                                           [JIPMER 1999]
  A)
             3 amp done clear
  B)
             12 amp done clear
  C)
             24 amp                                    done clear
  D)
             6 amp done clear
  View Solution play_arrow

• question_answer54)
  A storage cell is charged by 5 amp D.C. for 18 hours.  Its strength after charging will be                                    [JIPMER 1999]
  A)
             18 AH done clear
  B)
                                       5 AH done clear
  C)
             90 AH done clear
  D)
             15 AH done clear
  View Solution play_arrow

• question_answer55)
  A battery having e.m.f. \[5\,\,V\] and internal resistance 0.5 W is connected with a resistance of 4.5 W then the voltage at the terminals of battery is                                    [RPMT 2000]
  A)
             4.5 V                                         done clear
  B)
             4 V done clear
  C)
             0 V done clear
  D)
             2 V done clear
  View Solution play_arrow

• question_answer56)
  In the given circuit the current I1 is                           [DCE 2000]
  A)
             0.4 A done clear
  B)
             ? 0.4 A done clear
  C)
             0.8 A done clear
  D)
             ? 0.8 A done clear
  View Solution play_arrow

• question_answer57)
  The internal resistance of a cell of e.m.f. 12V is \[5\times {{10}^{-2}}\,\Omega \]. It is connected across an unknown resistance. Voltage across the cell, when a current of 60 A is drawn from it, is [CBSE PMT 2000]
  A)
             15 V                                          done clear
  B)
             12 V done clear
  C)
             9 V done clear
  D)
             6 V done clear
  View Solution play_arrow

• question_answer58)
  The current in the given circuit is                                                   [AIIMS 2000; MH CET 2003]
  A)
             0.1 A done clear
  B)
             0.2 A done clear
  C)
             0.3 A done clear
  D)
             0.4 A done clear
  View Solution play_arrow

• question_answer59)
  A current of 2.0 ampere passes through a cell of e.m.f. 1.5 volts having internal resistance of 0.15 ohm.  The potential difference measured, in volts, across both the ends of the cell will be                                     [UPSEAT 1999, 2000]
  A)
             1.35                                           done clear
  B)
             1.50 done clear
  C)
             1.00                                           done clear
  D)
             1.20 done clear
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• question_answer60)
  A battery has e.m.f. 4 V and internal resistance r. When this battery is connected to an external resistance of 2 ohms, a current of 1 amp. flows in the circuit.  How much current will flow if the terminals of the battery are connected directly [MP PET 2001]
  A)
             1 amp                                      done clear
  B)
             2 amp done clear
  C)
             4 amp                                      done clear
  D)
             Infinite done clear
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• question_answer61)
  Two batteries A and B each of e.m.f. 2 V are connected in series to an external resistance R = 1 ohm.  If the internal resistance of battery A is 1.9 ohms and that of B is 0.9 ohm, what is the potential difference between the terminals of battery A                                                                        [MP PET 2001]
  A)
             2 V done clear
  B)
             3.8 V done clear
  C)
             Zero done clear
  D)
             None of the above done clear
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• question_answer62)
  When a resistor of 11 W is connected in series with an electric cell, the current flowing in it is 0.5 A.  Instead, when a resistor of 5 W is connected to the same electric cell in series, the current increases by 0.4 A. The internal resistance of the cell is                                                                  [EAMCET 2001]
  A)
              1.5 W                                       done clear
  B)
             2 W done clear
  C)
              2.5 W                                       done clear
  D)
             3.5 W done clear
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• question_answer63)
  The internal resistance of a cell is the resistance of [BHU 1999, 2000; AIIMS 2001]
  A)
             Electrodes of the cell         done clear
  B)
             Vessel of the cell done clear
  C)
             Electrolyte used in the cell done clear
  D)
             Material used in the cell done clear
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• question_answer64)
  How much work is required to carry a 6 mC charge from the negative terminal to the positive terminal of a 9 V battery [KCET (Med.) 2001]
  A)
             54 × \[{{10}^{-3}}\]J done clear
  B)
                                       54 × \[{{10}^{-6}}\]J done clear
  C)
             54 × \[{{10}^{-9}}J\]           done clear
  D)
             54 × \[{{10}^{-12}}\]J done clear
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• question_answer65)
  Consider four circuits shown in the figure below. In which circuit power dissipated is greatest  (Neglect the internal resistance of the power supply)                       [Orissa JEE 2002]                                
  A)
             done clear
  B)
                              done clear
  C)
                                  done clear
  D)
    done clear
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• question_answer66)
  The  emf of a battery  is 2 V  and  its  internal  resistance is 0.5 W. The maximum power which it can deliver to any external circuit will be                                       [AMU (Med.) 2002]
  A)
             8 Watt done clear
  B)
                                       4 Watt done clear
  C)
             2 Watt                                     done clear
  D)
             None of the above done clear
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• question_answer67)
  Kirchoff?s I law and II law of current, proves the [CBSE PMT 1993; BHU 2002; AFMC 2003]
  A)
             Conservation of charge and energy done clear
  B)
             Conservation of current and energy done clear
  C)
             Conservation of mass and charge done clear
  D)
             None of these done clear
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• question_answer68)
  In the circuit, the reading of the ammeter is (assume internal resistance of the battery be zero)
  A)
                     \[\frac{40}{29}A\] done clear
  B)
                     \[\frac{10}{9}A\] done clear
  C)
                     \[\frac{5}{3}A\] done clear
  D)
                     2 A done clear
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• question_answer69)
  In the above question, if the internal resistance of the battery is 1 ohm, then what is the reading of ammeter
  A)
                     5/3 A done clear
  B)
                                       40/29 A done clear
  C)
                     10/9 A                              done clear
  D)
             1 A done clear
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• question_answer70)
  Eels are able to generate current with biological cells called electroplaques. The electroplaques in an eel are arranged in 100 rows, each row stretching horizontally along the body of the fish containing 5000 electroplaques. The arrangement is suggestively shown below. Each electroplaques has an emf of 0.15 V and internal resistance of 0.25 W                    [AIIMS 2004] The water surrounding the eel completes a circuit between the head and its tail. If the water surrounding it has a resistance of 500 W, the current an eel can produce in water is about
  A)
             1.5 A done clear
  B)
                                       3.0 A done clear
  C)
             15 A                                          done clear
  D)
             30 A done clear
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• question_answer71)
  Current provided by a battery is maximum when [AFMC 2004]
  A)
             Internal resistance equal to external resistance done clear
  B)
             Internal resistance is greater than external resistance done clear
  C)
             Internal resistance is less than external resistance done clear
  D)
             None of these done clear
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• question_answer72)
  A battery is charged at a potential of 15 V for 8 hours when the current flowing is 10 A. The battery on discharge supplies a current of 5 A for 15 hours. The mean terminal voltage during discharge is 14 V. The "Watt-hour" efficiency of the battery is                                                       [CBSE PMT 2004]
  A)
             82.5%                                       done clear
  B)
             80 % done clear
  C)
             90%                                           done clear
  D)
             87.5% done clear
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• question_answer73)
  In the given current distribution what is the value of I [Orissa PMT 2004]
  A)
             3A done clear
  B)
             8 A done clear
  C)
             2A done clear
  D)
             5A done clear
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• question_answer74)
  A capacitor is connected to a cell of emf E having some internal resistance r. The potential difference across the [CPMT 2004; MP PMT 2005]
  A)
             Cell is < E done clear
  B)
                                       Cell is E done clear
  C)
             Capacitor is > E                     done clear
  D)
             Capacitor is < E done clear
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• question_answer75)
  When the resistance of 9 W is connected at the ends of a battery, its potential difference decreases from 40 volt to 30 volt. The internal resistance of the battery is    [DPMT 2003]
  A)
             6 W done clear
  B)
             3 W done clear
  C)
             9 W done clear
  D)
             15 W done clear
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• question_answer76)
  The maximum power drawn out of the cell from a source is given by (where r is internal resistance)        [DCE 2002]
  A)
             \[{{E}^{2}}/2r\] done clear
  B)
                                       \[{{E}^{2}}/4r\] done clear
  C)
             \[{{E}^{2}}/r\]                       done clear
  D)
             \[{{E}^{2}}/3r\] done clear
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• question_answer77)
  Find out the value of current through 2W resistance for the given circuit                                [IIT-JEE (Screening) 2005]
  A)
             5 A done clear
  B)
             2 A done clear
  C)
             Zero done clear
  D)
             4 A done clear
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• question_answer78)
  Two batteries, one of emf 18 volts and internal resistance \[2\Omega \] and the other of emf 12 volt and internal resistance \[1\Omega \], are connected as shown. The voltmeter \[V\]will record a reading of                                   [CBSE PMT 2005]
  A)
                      15 volt done clear
  B)
                      30 volt done clear
  C)
                      14 volt done clear
  D)
                      18 volt done clear
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• question_answer79)
  Two sources of equal emf are connected to an external resistance R. The internal resistances of the two sources are \[{{R}_{1}}\] and \[{{R}_{2}}\,({{R}_{2}}>{{R}_{1}})\]. If the potential difference across the source having internal resistance \[{{R}_{2}}\] is zero, then [AIEEE 2005]
  A)
              \[R={{R}_{1}}{{R}_{2}}/({{R}_{1}}+{{R}_{2}})\]                         done clear
  B)
                      \[R={{R}_{1}}{{R}_{2}}/({{R}_{2}}-{{R}_{1}})\]                  done clear
  C)
              \[R={{R}_{2}}\times ({{R}_{1}}+{{R}_{2}})/({{R}_{2}}-{{R}_{1}})\] done clear
  D)
              \[R={{R}_{2}}-{{R}_{1}}\] done clear
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• question_answer80)
  An energy source will supply a constant current into the load if its internal resistance is                                  [AIEEE 2005]
  A)
              Zero done clear
  B)
                      Non-zero but less than the resistance of the load done clear
  C)
              Equal to the resistance of the load done clear
  D)
              Very large as compared to the load resistance done clear
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• question_answer81)
  The magnitude of i in ampere unit is                      [KCET 2005]
  A)
                     0.1 done clear
  B)
                     0.3 done clear
  C)
                     0.6 done clear
  D)
                     None of these done clear
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• question_answer82)
  To draw maximum current from a combination of cells, how should the cells be grouped                                              [AFMC 2005]
  A)
                     Series done clear
  B)
                     Parallel done clear
  C)
                     Mixed done clear
  D)
             Depends upon the relative values of external and internal resistance done clear
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• question_answer83)
  The figure shows a network of currents. The magnitude of currents is shown here. The current I will be [BCECE 2005]
  A)
             3 A done clear
  B)
             9 A done clear
  C)
             13 A done clear
  D)
             19 A done clear
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• question_answer84)
  The n rows each containing m cells in series are joined in parallel. Maximum current is taken from this combination across an external resistance of 3W resistance. If the total number of cells used are 24 and internal resistance of each cell is 0.5 W then                                                       [J & K CET 2005]
  A)
             \[m=8,n=3\] done clear
  B)
                                       \[m=6,n=4\] done clear
  C)
             \[m=12,n=2\] done clear
  D)
             \[m=2,n=12\] done clear
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• question_answer85)
  A cell of constant e.m.f. first connected to a resistance \[{{R}_{1}}\] and then connected to a resistance \[{{R}_{2}}\]. If power delivered in both cases is then the internal resistance of the cell is [Orissa JEE 2005]
  A)
             \[\sqrt{{{R}_{1}}{{R}_{2}}}\] done clear
  B)
                                       \[\sqrt{\frac{{{R}_{1}}}{{{R}_{2}}}}\] done clear
  C)
             \[\frac{{{R}_{1}}-{{R}_{2}}}{2}\]                                        done clear
  D)
             \[\frac{{{R}_{1}}+{{R}_{2}}}{2}\] done clear
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