# Solved papers for NEET Physics Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर NEET PYQ-Current Electricity Charging Capacitors

### done NEET PYQ-Current Electricity Charging Capacitors Total Questions - 95

• question_answer1) Three equal resistors connected in series across .a source of emf together dissipate 10 watt of power. What will be the power dissipated in watt if the same resistors are connected in parallel across the same source of emf?             [AIPMT 1998]

A)
10/3

B)
10

C)
30

D)
90

• question_answer2) A $5{}^\circ C$ rise in temperature is observed in a conductor by passing a current. When the current is doubled the rise in temperature will be approximately:                                                                                       [AIPMT 1998]

A)
$16{}^\circ C$

B)
$10{}^\circ C$

C)
$20{}^\circ C$

D)
$12{}^\circ C$

• question_answer3) If nearly ${{10}^{5}}C$ liberate 1 g equivalent of aluminium, then the amount of aluminium (equivalent weight 9) deposited through electrolysis in 20 min by a current of 50 amp will be:                                              [AIPMT 1998]

A)
0.6 g

B)
0.09 g

C)
5.4 g

D)
10.8 g

• question_answer4) A galvanometer having a resistance of 8 ohm is shunted by a wire of resistance 2 ohm. If the total current is 1 A, the part of it passing through the shunt will be:                                                                            [AIPMT 1998]

A)
0.25 A

B)
0.8 A

C)
0.2 A

D)
0.5 A

• question_answer5)  The current $(l)$ in the given circuit is:                                                      [AIPMT 1999]

A)
1.6 A

B)
2 A

C)
0.32 A

D)
3.2 A

• question_answer6) In metre-bridge the balancing length from left is found to be 20 cm when standard resistance of $1\,\,\Omega$ is in right gap. The value of unknown resistance is:                                                                                               [AIPMT 1999]

A)
$0.25\,\,\Omega$

B)
$0.4\,\,\Omega$

C)
$0.5\,\,\Omega$

D)
$4\,\,\Omega$

• question_answer7) A potentiometer consists of a wire of length 4 m and resistance $10\,\,\Omega$. It is connected to a cell of emf 2V. The potential gradient of wire is:                                                                                               [AIPMT 1999]

A)
0.5 V/m

B)
2 V/m

C)
5 V/m

D)
10 V/m

• question_answer8) The internal resistance of a cell of emf 2 V is $0.1\,\,\Omega$. It is connected to a resistance of $3.9\,\,\Omega \,$. The voltage across the cell will be:                                                                                          [AIPMT 1999]

A)
0.5 V

B)
1.9 V

C)
1.95 V

D)
2 V

• question_answer9) Two wires are held perpendicular to the plane of paper at 5 m apart. They carry currents of 2.5 A and 5 A in same direction. Then the magnetic field strength  at a point midway between the wires will be:              [AIPMT 2000]

A)
$\frac{{{\mu }_{0}}}{4\pi }T$

B)
$\frac{{{\mu }_{0}}}{2\pi }T$

C)
$\frac{3{{\mu }_{0}}}{2\pi }T$

D)
$\frac{3{{\mu }_{0}}}{4\pi }T$

• question_answer10)  A bridge circuit is shown in figure the equivalent resistance between A and B will be:   [AIPMT 2000]

A)
$21\,\,\Omega$

B)
$7\,\,\Omega$

C)
$\frac{252}{85}\,\Omega$

D)
$\frac{14}{3}\Omega$

• question_answer11) Two bulbs 25 W, 220 V and 100 W, 220 V are given. Which has higher resistance?                  [AIPMT 2000]

A)
25 W bulb

B)
100 W bulb

C)
Both bulbs will have equal resistance

D)
Resistance of bulbs cannot be compared

• question_answer12) Potentiometer measures the potential difference more accurately than a voltmeter because:                  [AIPMT 2000]

A)
it has a wire of high resistance

B)
it has a wire of low resistance

C)
it does not draw current from external circuit

D)
it draws a heavy current from external circuit

• question_answer13) In electrolysis the mass deposited on an electrode is directly proportional to:                            [AIPMT 2000]

A)
current

B)
square of current

C)
concentration of solution

D)
inverse of current

• question_answer14) A cell has an emf 1.5 V. When connected across an external resistance of $2\,\,\Omega ,$ the terminal potential difference falls to 1.0 V. The internal resistance of the cell is:                                                                        [AIPMT 2000]

A)
$2\,\,\Omega$

B)
$1.5\,\,\Omega$

C)
$1.0\,\,\Omega$

D)
$0.5\,\,\Omega$

• question_answer15) Si and Cu are cooled to a temperature of 300 K, then resistivity:                              [AIPMT 2001]

A)
for Si increases and for Cu decreases

B)
for Cu increases and for Si decrease

C)
deceases for both Si and Cu

D)
increases for both Si and Cu

• question_answer16) In a Wheatstone's bridge resistance of each of the four sides is $10\,\,\Omega$. If the resistance of the galvanometer is also $10\,\,\Omega$ then effective resistance of the bridge will be:                                              [AIPMT 2001]

A)
$10\,\,\Omega$

B)
$5\,\,\Omega$

C)
$20\,\,\Omega$

D)
$40\,\,\Omega$

• question_answer17) Resistivity of potentiometer wire is ${{10}^{-7}}\,ohm$ metre and its area of cross-section is ${{10}^{-6}}\,{{m}^{2}}$. When a current $i=0.1\text{ }A$ flows through the wire, its potential gradient is:           [AIPMT 2001]

A)
${{10}^{-2}}\,V/m$

B)
${{10}^{-4}}\,V/m$

C)
$0.1\text{ }V/m$

D)
$10\text{ }V/m$

• question_answer18) The specific resistance of a conductor increases with:                                             [AIPMT 2002]

A)
increase in temperature

B)
increase in cross-sectional area

C)
decrease in length

D)
decrease in cross-sectional area

• question_answer19) To convert a galvanometer into a voltmeter, one should connect a:              [AIPMT 2002]

A)
high resistance in series with galvanometer

B)
low resistance in series with galvanometer

C)
high resistance in parallel with galvanometer

D)
low resistance in parallel with galvanometer

• question_answer20) For a cell the terminal potential difference is $2.2\text{ }V$ when circuit is open and reduces to $1.8\text{ }V$ when cell is connected to a resistance $R=5\,\Omega ,$ the internal resistance (r) of cell is:                       [AIPMT 2002]

A)
$\frac{10}{9}\Omega$

B)
$\frac{9}{10}\,\Omega$

C)
$\frac{11}{9}\Omega$

D)
$\frac{5}{9}\Omega$

• question_answer21) An electric kettle has two heating coils. When one of the coils is connected to an AC source, the water in the kettle boils in 10 min. When the other coil is used the water boils in 40 min. If both the coils are connected in parallel, the time taken by the same quantity of water to boil will be:                                                                               [AIPMT 2003]

A)
25 min

B)
15 min

C)
8 min

D)
4 min

• question_answer22) In a Wheatstone's bridge all the four arms have equal resistance R. If the resistance of the galvanometer arm is also R, the equivalent resistance of the combination as seen by the battery is:                            [AIPMT 2003]

A)
R

B)
2R

C)
$\frac{R}{4}$

D)
$\frac{R}{2}$

• question_answer23) Fuse wire is a wire of:                                                                                           [AIPMT 2003]

A)
low resistance and low melting point

B)
low resistance and high melting point

C)
high resistance and high melting point

D)
high resistance and low melting point

• question_answer24) A battery is charged at a potential of 15 V for 8 H when the current flowing is 10 A. The battery on discharge supplies a current of 5 A for 15 H. The mean terminal voltage during discharge is 14 V. The watt-hour efficiency of the battery is:                                                                                                                                     [AIPMT (S) 2004]

A)
82.5%

B)
80%

C)
90%

D)
87.5%

• question_answer25) The electric resistance of a certain wire of iron is R. If its length and radius are both doubled, then:   [AIPMT (S) 2004]

A)
the resistance will be doubled and the specific resistance will be halved

B)
the resistance will be halved and the specific resistance will remain unchanged

C)
the resistance will be halved and the specific resistance will be doubled

D)
the resistance and the specific resistance, will both remain unchanged

• question_answer26) A galvanometer acting as a voltmeter will have:                                                      [AIPMT (S) 2004]

A)
a high resistance in parallel with its coil

B)
a high resistance in series with its coil

C)
a low resistance in parallel with its coil

D)
a low resistance in series with its coil

• question_answer27) When three identical bulbs of 60 W, 200 V rating are connected in series to a 200 V supply, the power drawn by them will be:                                                                                                                                     [AIPMT (S) 2004]

A)
60 W

B)
180 W

C)
10 W

D)
20 W

• question_answer28) Resistances n, each, of r ohm, when connected in parallel give an equivalent resistance of R ohm. If these resistances were connected in series, the combination would have a resistance in ohms, equal to:

A)
${{n}^{2}}R$

B)
$R/{{n}^{2}}$

C)
R/n

D)
nR

• question_answer29)  Five equal resistances each of resistance R are connected as shown in the figure. A battery of V volts is connected between A and B. The current flowing in AFCEB will be:                                                          [AIPMT (S) 2004]

A)
$\frac{3V}{R}$

B)
$\frac{V}{R}$

C)
$\frac{V}{2R}$

D)
$\frac{2V}{R}$

• question_answer30) A galvanometer of $50\,\Omega$ resistance has 25 divisions. A current of $4\times {{10}^{-4}}A$ gives a deflection of one division. To convert this galvanometer into a voltmeter having a range of 25 V, it should be connected with a resistance of:                                                                                                                   [AIPMT (S) 2004]

A)
$2500\,\Omega$ as a shunt

B)
$245\,\Omega$  as shunt

C)
$2550\,\Omega$ in series

D)
$2450\,\Omega$ in series

• question_answer31) A 6V battery is connected to the terminals of a three metre long wire of uniform thickness and resistance of $100\,\Omega$. The difference of potential between two points on the wire separated by a distance or 50 cm will be:     [AIPMT (S) 2004]

A)
2 V

B)
3 V

C)
1 V

D)
1.5 V

• question_answer32) In India electricity is supplied for domestic use at 220 V. It is supplied at 110 V in USA. If the resistance of a 60 W bulb for use in India is R, the resistance of a 60 W bulb for use in USA will be:                                  [AIPMT (S) 2004]

A)
$R$

B)
$2R$

C)
$\frac{R}{4}$

D)
$\frac{R}{2}$

• question_answer33)  Two batteries, one of emf 18 V and internal resistance $2\,\,\Omega$ and the other of emf 12 V and internal resistance $1\,\,\Omega ,$ are connected as shown. The voltmeter V will record a reading of:      [AIPMT (S) 2005]

A)
15 V

B)
30 V

C)
14 V

D)
18 V

• question_answer34) The temperature of inversion of a thermocouple is $620{}^\circ C$ and the neutral temperature is $300{}^\circ C$.  What is the temperature of cold junction?                                                              [AIPMT (S) 2005]

A)
$20{}^\circ C$

B)
$320{}^\circ C$

C)
$-20{}^\circ C$

D)
$40{}^\circ C$

• question_answer35) When a wire of uniform cross-section a, length $l$ and resistance R is bent into a complete circle, resistance between two of diametrically opposite points will be:                                                                         [AIPMT (S) 2005]

A)
$\frac{R}{4}$

B)
$\frac{R}{8}$

C)
$4\,R$

D)
$\frac{R}{2}$

• question_answer36) A 5 A fuse wire can withstand a maximum power of 1 W in circuit. The resistance of the fuse wire is:  [AIPMT (S) 2005]

A)
$0.2\,\,\Omega$

B)
$5\,\,\Omega$

C)
$0.4\,\,\Omega$

D)
$0.04\,\,\Omega$

• question_answer37)  For the network shown in the figure, the value of the current i is:                         [AIPMT (S) 2005]

A)
$\frac{9V}{35}$

B)
$\frac{5V}{18}$

C)
$\frac{5V}{9}$

D)
$\frac{18V}{5}$

• question_answer38) In producing chlorine through electrolysis 100 W power at 125 V is being consumed. How much chlorine per min is liberated? ECE of chlorine is $0.367\times {{10}^{-6}}\,kg/C$:                                                        [AIPMT (S) 2006]

A)
17.6 mg

B)
21.3 mg

C)
24.3 mg

D)
13.6 mg

• question_answer39)  In die circuit shown, if a conducting wire is connected between points A and B, the current in this wire will:                                                                                                                                                                                                                                                                                                     [AIPMT (S) 2006]

A)
flow from A to B

B)
flow in the direction which will be decided by the value of V

C)
be zero

D)
flow from B to A

• question_answer40) Two cells, having the same emf, are connected in series through an external resistance R. Cells have internal resistances ${{r}_{1}}$ and ${{r}_{2}}({{r}_{1}}>{{r}_{2}})$ respectively. When the circuit is closed, the potential difference across the first cell is zero. The value of R is:                                                                    [AIPMT (S) 2006]

A)
${{r}_{1}}-{{r}_{2}}$

B)
$\frac{{{r}_{1}}+{{r}_{2}}}{2}$

C)
$\frac{{{r}_{1}}-{{r}_{2}}}{2}$

D)
${{r}_{1}}+{{r}_{2}}$

• question_answer41)  Power dissipated across the $8\,\,\Omega$ resistor in the circuit shown here is 2 W. The power dissipated in watt units across the $3\,\,\Omega$ resistor is:                                                                                              [AIPMT (S) 2006]

A)
2.0

B)
1.0

C)
0.5

D)
3.0

• question_answer42) Kirchhoffs first and second laws for electrical circuits are consequences of:                               [AIPMT (S) 2006]

A)
conservation of energy

B)
conservation of electric charge and energy respectively

C)
conservation of electric charge

D)
conservation of energy and electric charge respectively

• question_answer43) If the cold junction of a thermo-couple is kept at $0{}^\circ C$ and the hot junction is kept at $T{}^\circ C,$ then the relation between neutral temperature $({{T}_{n}})$ and temperature of inversion $({{T}_{i}})$ is:                                                                                                                                    [AIPMT (S) 2007]

A)
${{T}_{n}}=\frac{{{T}_{i}}}{2}$

B)
${{T}_{n}}=2{{T}_{i}}$

C)
${{T}_{n}}={{T}_{i}}-T$

D)
${{T}_{n}}={{T}_{i}}+T$

• question_answer44)  The total power dissipated in watts in the circuit shown here                   [AIPMT (S) 2007]

A)
16

B)
40

C)
54

D)
4

• question_answer45) The resistance of an ammeter is x$13\,\,\Omega$ and its scale is graduated for a current upto 100 A. After an additional shunt has been connected to this ammeter it becomes possible to measure currents upto 750 A by this meter. The value of shunt resistance is:                                                                                                                      [AIPMT (S) 2007]

A)
$20\,\,\Omega$

B)
$2\,\,\Omega$

C)
$0.2\,\,\Omega$

D)
$2\,k\,\Omega$

• question_answer46) A steady current of 1.5 A flows through a copper voltameter for 10 min. If the electrochemical equivalent of copper is $30\times {{10}^{-5}}g\text{ }{{C}^{-1}}$ the mass of copper deposited on the electrode will be:                            [AIPMT (S) 2007]

A)
0.40 g

B)
0.50 g

C)
0.67 g

D)
0.27 g

• question_answer47) Three resistances P, Q, R each of $2\,\Omega$ and an unknown resistance S form the four arms of a Wheatstone's bridge circuit. When a resistance of $6\,\Omega$ is connected in parallel to S the bridge gets balanced. What is the value of S? [AIPMT (S) 2007]

A)
$2\,\,\Omega$

B)
$3\,\,\Omega$

C)
$6\,\,\Omega$

D)
$1\,\,\Omega$

• question_answer48) The ground state energy of hydrogen atom is $-13.6\text{ }eV$. When its electron is in the first excited state, its excitation energy is                                                                                                                      [AIPMPT (S) 2008]

A)
$3.4\text{ }eV$

B)
$6.8\text{ }eV$

C)
$10.2\text{ }eV$

D)
zero

• question_answer49) A wire of a certain material is stretched slowly by ten per cent. Its new resistance and specific resistance become respectively [AIPMPT (S) 2008]

A)
1.2 times, 1.1 times

B)
1.21 times, same

C)
both remain the same

D)
1.1 times, 1.1 times

• question_answer50) A cell can be balanced against 110 cm and 100 cm of potentiometer wire, respectively with and without being short circuited through a resistance of $10\,\,\Omega$ its internal resistance is                                                        [AIPMPT (S) 2008]

A)
$1.0\,\,\Omega$

B)
$0.5\,\,\Omega$

C)
$2.0\,\,\Omega$

D)
zero

• question_answer51)  In the circuit shown, the current through the $4\,\,\Omega$resistor is 1 A when the points P and M are connected to a DC voltage source. The potential difference between the points M and N is                                     [AIPMPT (S) 2008]

A)
1.5 V

B)
1.0 V

C)
0.5 V

D)
A galvanometer of resistance 500 is connected to a battery of 3 V along with a resistance of $2950\,\Omega$ in series. A full scale deflection of 30 divisions is obtained in the galvanometer. In order to reduce this deflection to 20 divisions, the resistance in series should be                                                                                                              [AIPMPT (S) 2008]

A)
$5050\,\,\Omega$

B)
$5550\,\,\Omega$

C)
$6050\,\,\Omega$

D)
$4450\,\,\Omega$

• question_answer53)  A potentiometer circuit is set up as shown. The potential gradient across the potentiometer wire, is k volt/cm and the ammeter, present in the circuit, reads 1.0 A when two way key is switched off. The balance points, when the key between the terminals (i) 1 and 2 (ii) 1 and 3, is plugged in, are found to be at lengths ${{l}_{1}}cm$ and ${{l}_{2}}cm$ respectively. The magnitudes,  of the resistors R and X, in ohm, are then, equal, respectively, to [AIPMT (S) 2010]

A)
$k({{l}_{2}}-{{l}_{1}})$ and $k{{l}_{2}}$

B)
$k{{l}_{2}}$ and $k\,({{l}_{2}}-{{l}_{1}})$

C)
$k({{l}_{2}}-{{l}_{1}})$ and $k\,{{l}_{1}}$

D)
$k{{l}_{2}}$ and $k{{l}_{2}}$

• question_answer54) A galvanometer has a coil of resistance $100\,\Omega$ and gives a full scale deflection for 30 mA current. If it is to work as a voltmeter of 30 V range, the resistance required to be added will be                                [AIPMT (S) 2010]

A)
$900\,\Omega$

B)
$1800\,\Omega$

C)
$500\,\Omega$

D)
$1000\,\Omega$

• question_answer55)  In the given circuit the reading of voltmeter ${{V}_{1}}$ and ${{V}_{2}}$ are 300 V each. The reading to the voltmeter ${{V}_{3}}$ and ammeter A are respectively                                                       [AIPMT (S) 2010]

A)
150 V, 2.2 A

B)
220 V, 2.2 A

C)
220 V, 2.0 A

D)
100 V, 2.0 A

• question_answer56)  Consider the following two statements Kirchhoffs junction law follows from the conservation of charge. Kirchhoffs loop law follows from the conservation of energy.                                             [AIPMT (S) 2010] Which of the following is correct?

A)
Both  and  are wrong

B)
is correct and  is wrong

C)
is wrong and  is correct

D)
Both  and  are correct

• question_answer57) The thermo emf E in volt of a certain thermo-couple is found to vary with temperature difference $\theta$ in $^{o}C$ between the two junctions according to the relation $E=30\,\theta -\frac{{{\theta }^{2}}}{15}$. The neutral temperature for the thermo-couple will be                                                                                             [AIPMT (M) 2010]

A)
$450{}^\circ C$

B)
$400{}^\circ C$

C)
${{225}^{o}}C$

D)
${{30}^{o}}C$

• question_answer58) A galvanometer of resistance, G is shunted by a resistance S ohm. To keep the main current in the circuit unchanged, the resistance to be put in series with the galvanometer is                                                           [AIPMT (M) 2011]

A)
$\frac{{{S}^{2}}}{(S+G)}$

B)
$\frac{SG}{(S+G)}$

C)
$\frac{{{G}^{2}}}{(S+G)}$

D)
$\frac{G}{(S+G)}$

• question_answer59) A thermocouple of negligible resistance, produces an emf of $40\mu V{{/}^{o}}C$ in the linear range of temperature. A galvanometer of resistance $10\,\Omega$ whose sensitivity is $1\mu A/div,$ employed with the thermocouple. The smallest value of temperature difference that can be detected by the system will be                                [AIPMT (M) 2011]

A)
$0.5{}^\circ C$

B)
$1{}^\circ C$

C)
$0.1{}^\circ C$

D)
$0.25{}^\circ C$

• question_answer60)  In the circuit shown in the figure, if potential, at point A is taken to be zero, the potential at point B is

A)
$-1\text{ }V$

B)
$+2\text{ }V$

C)
$-2\text{ }V$

D)
$+1\text{ }V$

• question_answer61)  If power dissipated in the $9\,\,\Omega$ resistor in the circuit shown is 36 W, the potential difference across the $2\,\Omega$ resistor is                                                       [AIPMT (S) 2011]

A)
8 V

B)
10 V

C)
2 V

D)
4 V

• question_answer62) The rate of increase of thermo emf with temperature at the neutral temperature of a thermocouple     [AIPMT (S) 2011]

A)
is zero

B)
depends upon the choice of the two materials of the thermocouple

C)
is negative

D)
is positive

• question_answer63)  The power dissipated in the circuit shown in the figure is 30 Watt. The value of R is     [AIPMT (M) 2012]

A)
$20\,\,\Omega$

B)
$15\,\,\Omega$

C)
$10\,\,\Omega$

D)
$30\,\,\Omega$

• question_answer64)  A millivolt meter of 25 mV range is to be converted into an ammeter of 25 A range. [AIPMT (S) 2012] The value (in ohm) of necessary shunt will be

A)
0.001

B)
0.01

C)
1

D)
0.05

• question_answer65)  In the circuit shown the cells A and B have negligible   resistances.   For  ${{V}_{A}}=12\,V,$ ${{R}_{1}}=500\,\Omega$ and $R=100\,\Omega$ the galvanometer (G) shows no deflection. The value of ${{V}_{B}}$ is [AIPMT (S) 2012]

A)
4 V

B)
2 V

C)
12 V

D)
6 V

• question_answer66) If voltage across a bulb rated $220\text{ }V-100\text{ }W$ drops by 2.5% of its rated value, the percentage of the rated value by which the power would decrease is                                                                                [AIPMT (S) 2012]

A)
20%

B)
2.5%

C)
5%

D)
10%

• question_answer67) A wire of resistance $4\,\Omega$ is stretched to twice   its   original   length. The resistance of stretched wire would be                                                                                                                                        [NEET 2013]

A)
$2\,\,\Omega$

B)
$4\,\,\Omega$

C)
$8\,\,\Omega$

D)
$16\,\,\Omega$

• question_answer68) The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of $10\,\,\Omega$ is [NEET 2013]

A)
$0.2\,\,\Omega$

B)
$0.5\,\,\Omega$

C)
$0.8\,\,\Omega$

D)
$1.0\,\,\Omega$

• question_answer69) The resistances of the four arms P, Q, R and S in a Wheat stone's bridge are $10\,\,\Omega ,\,30\,\,\Omega ,30\,\,\Omega$ and $90\,\,\Omega ,$ respectively. The emf and internal resistance of the cell are 7 V and $5\,\,\Omega$ respectively. If the galvanometer resistance is $50\,\,\Omega ,$ the current drawn from the cell will be                 [NEET 2013]

A)
1.0 A

B)
0.2 A

C)
0.1 A

D)
2.0 A

• question_answer70) Two cities are 150 km apart. Electric power is sent from one city to another city through copper wires. The fall of potential per km is 8 V and the average resistance per km is $0.5\,\,\Omega$. The power loss in the wire is  [NEET 2014]

A)
19.2 W

B)
19.2 kW

C)
19.2 J

D)
12.2 Kw

• question_answer71)  The resistances in the two arms of the meter bridge are $5\,\Omega$ and $R\,\Omega$, respectively. When the resistance R is shunted with an equal resistance, the new balance point is at $1.6\,{{l}_{1}}$.                              [NEET 2014] The resistance R, is

A)
$10\,\,\Omega$

B)
$15\,\,\Omega$

C)
$20\,\,\Omega$

D)
$25\,\,\Omega$

• question_answer72)  A potentiometer circuit has been set up for finding the internal resistance of a given cell. The main battery, used across the potentiometer wire, has an emf of 2.0 V and a negligible internal resistance. The potentiometer wire itself is 4 m long. When the resistance, R, connected across the given cell, has values of [NEET 2014] (i) infinity                       (ii) $9.5\,\,\Omega$ the balancing lengths, on the potentiometer wire are found to be 3 m and 2.85 m, respectively. The value of internal resistance of the cell is

A)
$0.25\,\,\Omega$

B)
$0.95\,\,\Omega$

C)
$0.5\,\,\Omega$

D)
$0.75\,\,\Omega$

• question_answer73) In an ammeter 0.2% of main current passes through the galvanometer. If resistance of galvanometer is G, the resistance of ammeter will be                                                                                                              [NEET 2014]

A)
$\frac{1}{499}G$

B)
$\frac{499}{500}G$

C)
$\frac{1}{500}G$

D)
$\frac{500}{499}G$

• question_answer74) A potentiometer wire has length 4 m and resistance $8\,\,\Omega$. The resistance that must be connected in series with the wire and an accumulator of emf 2V, so as to get a potential gradient 1 mV per cm on the wire is      [NEET  2015]

A)
$32\,\,\Omega$

B)
$40\,\,\Omega$

C)
$44\,\,\Omega$

D)
$48\,\,\Omega$

• question_answer75)  A, B and C are voltmeters of resistance R, 1.5 R and 3R respectively as shown in the figure. When some potential difference is applied between X and Y, the voltmeter readings are ${{V}_{A}},{{V}_{B}}$ and ${{V}_{C}}$ respectively.                                                                                                      [NEET  2015] Then,

A)
${{V}_{A}}={{V}_{B}}={{V}_{C}}$

B)
${{V}_{A}}\ne {{V}_{B}}={{V}_{C}}$

C)
${{V}_{A}}={{V}_{B}}\ne {{V}_{C}}$

D)
${{V}_{A}}\ne {{V}_{B}}\ne {{V}_{C}}$

• question_answer76) Across a metallic conductor of non-uniform cross-section, a constant potential difference is applied. The quantity which remain constant along the conductor is                                                                                         [NEET  2015]

A)
current density

B)
current

C)
drift velocity

D)
electric field

• question_answer77) A circuit contains an ammeter, a battery of 30V and a resistance $40.8\,\Omega$ all connected in series. If the ammeter has a coil of resistance $480\,\Omega$ and a shunt of $20\,\Omega ,$ then reading in the ammeter will be   [NEET (Re) 2015]

A)
0.5 A

B)
0.25 A

C)
2 A

D)
1 A

• question_answer78) A potentiometer wire of length L and a resistance r are connected in series with a battery of e.m.f. ${{E}_{0}}$ and a resistance ${{r}_{1}}$. An unknown e.m.f. is balanced at a length $I$ of the potentiometer wire. The e.m.f. E will be given by                                                                                                                             [NEET (Re) 2015]

A)
$\frac{L{{E}_{0}}f}{l\,{{r}_{1}}}$

B)
$\frac{{{E}_{0}}r}{(r+{{r}_{1}})}.\frac{l}{L}$

C)
$\frac{{{E}_{0}}l}{L}$

D)
$\frac{L{{E}_{0}}r}{(r+{{r}_{1}})l}$

• question_answer79) The charge flowing through a resistance R varies with time t as $Q=at-b{{t}^{2}},$ where a and b are positive constants. The total heat produced in R is:                                                                                                          [NEET - 2016]

A)
$\frac{{{a}^{3}}R}{6b}$

B)
$\frac{{{a}^{3}}R}{3b}$

C)
$\frac{{{a}^{3}}R}{2b}$

D)
$\frac{{{a}^{3}}R}{b}$

• question_answer80) A potentiometer wire is 100 cm long and a constant potential difference is maintained across it. Two cells are connected in series first to support one another and then in opposite direction. The balance points are obtained at 50 cm and 10 cm from the positive end of the wire in the two cases. The ratio of emf's is                                                           [NEET - 2016]

A)
5 : 1

B)
5 : 4

C)
3 : 4

D)
3 : 2

• The resistance of a wire is R ohm. If it is melted and stretched to n times its original length, its new resistance will be                                                                                                                            [NEET-2017]

A)
$\frac{R}{{{n}^{2}}}$

B)
$nR$

C)
$\frac{R}{n}$

D)
${{n}^{2}}R$

• question_answer82) A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F, because the method involves:                                                                                                                                         [NEET-2017]

A)
A combination of cells, galvanometer and resistances

B)
Cells

C)

D)
A condition of no current flow through the galvanometer

• question_answer83) A carbon resistor of$(47\pm 4.7)$ $\text{k}\Omega$ is to be marked with rings of different colours for its identification. The colour code sequence will be                                                                                             [NEET - 2018]

A)
Yellow - Green - Violet - Gold

B)
Yellow - Violet - Orange - Silver

C)
Violet - Yellow - Orange - Silver

D)
Green - Orange - Violet - Gold

• question_answer84) A set of 'n' equal resistors, of value 'R' each, are connected in series to a battery of emf 'E' and internal resistance 'R'. The current drawn is I. Now, the 'n' resistors are connected in parallel to the same battery. Then the current drawn from battery becomes 10 I. The value of n is                                                                                            [NEET - 2018]

A)
20

B)
11

C)
10

D)
9

• question_answer85) A battery consists of a variable number 'n' of identical cells (having internal resistance 'r' each) which are connected in series. The terminals of the battery are short-circuited and the current I is measured. Which of the graphs shows the correct relationship between I and n?                                                                                                [NEET - 2018]

A)

B)

C)

D)

• question_answer86)  In the circuits shown below, the readings of the voltmeters and the ammeters will be:           [NEET 2019]

A)
${{V}_{1}}={{V}_{2}}\text{ }and\text{ }{{i}_{1}}={{i}_{2}}$

B)
${{V}_{2}}>{{V}_{1}}\text{ }and\text{ }{{i}_{1}}>{{i}_{2}}$

C)
${{V}_{2}}>{{V}_{1}}\text{ }and\text{ }{{i}_{1}}={{i}_{2}}$

D)
${{V}_{1}}={{V}_{2}}\text{ }and\text{ }{{i}_{1}}>{{i}_{2}}$

• question_answer87) Which of the following acts as a circuit protection device?                                          [NEET 2019]

A)
Switch

B)
fuse

C)
Conductor

D)
inductor

• question_answer88) A parallel plate capacitor of capacitance 20 $\mu F$is being charged by a voltage source whose potential is charging at the rate of 3 V/s. The conduction current through the connecting wires, and the displacement current through the plates of the capacitor, would be, respectively:                                                                                         [NEET 2019]

A)
60 $\mu A$, zero

B)
zero, zero

C)
zero, 60 $\mu A$

D)
60 $\mu A$, 60 $\mu A$

• question_answer89)  Six similar bulbs are connected as shown in the figure with a DC source of emf E and zero internal resistance. The ratio of power consumption by the bulbs when (i) all are glowing and (ii) in the situation when two from section A and one from section B are glowing, will be.                                               [NEET 2019]

A)
1 : 2

B)
2 : 1

C)
4 : 9

D)
9 : 4

• question_answer90) Which of the following graph represents the variation of resistivity $(\rho )$ with temperature (T) for copper?   [NEET 2020]

A)

B)

C)

D)

• question_answer91)  The color code of a resistance is given below                                                           [NEET 2020] The values of resistance and tolerance, respectively, are

A)
$47\,\,k\Omega ,\,\,10%$

B)
$4.7\,\,k\Omega ,\,\,5%$

C)
$470\,\,\Omega ,\,\,5%$

D)
$470\,\,k\Omega ,\,\,5%$

• question_answer92) Find the torque about the origin when a force of $3\widehat{j}N$acts on a particle whose position vector is $2\widehat{k}\,m$.                                                                                                        [NEET 2020]

A)
$6\widehat{j}\,Nm$

B)
$-6\,\widehat{i}\,Nm$

C)
$6\,\widehat{k}\,Nm$

D)
$6\,\widehat{i}\,Nm$

• question_answer93) A resistance wire connected in the left gap of a metre bridge balances a $10\text{ }\Omega$ resistance in the right gap at a point which divides the bridge wire in the ratio$3:2$. If the length of the resistance wire is 1.5 m, then the length of $1\text{ }\Omega$ of the resistance wire is:                                                                                   [NEET 2020]

A)
$1.0\times {{10}^{1}}m$

B)
$1.5\times {{10}^{1}}m$

C)
$1.5\times {{10}^{2}}m$

D)
$1.0\times {{10}^{2}}m$

• question_answer94) A charged particle having drift velocity of $7.5\times {{10}^{4}}\text{ }m\text{ }{{s}^{1}}$ in an electric field of  $3\times {{10}^{10}}\text{ }V{{m}^{1}}$, has a mobility in ${{m}^{2}}\text{ }{{V}^{1}}\text{ }{{s}^{1}}$of:                                                                                                      [NEET 2020]

A)
$2.5\times {{10}^{6}}$

B)
$2.5\times {{10}^{6}}$

C)
$2.25\times {{10}^{15}}$

D)
$2.25\times {{10}^{15}}$

• question_answer95) The solids which have the negative temperature coefficient of resistance are:                       [NEET 2020]

A)
insulators only

B)
semiconductors only

C)
insulators and semiconductorsv

D)
metals