Question 1: Palette 1/116

NEET 2026 MCQ

A resistor is connected to a battery of 12 V emf and internal resistance $2 \Omega$. If the current in the circuit is 0.6 A , the terminal voltage of the battery is:

A

10 V

B

1.2 V

C

12 V

D

10.8 V

Question 2: Palette 2/116

NEET 2026 MCQ

A uniform metallic wire having resistance $4 \Omega$ is bent to form a square loop (ABCD) (see figure). A resistance of $2 \Omega$ is connected between points $B$ and $D$ and a battery of 2 V is connected across points $A$ and $C$ as shown in the figure. Now the value of current $(l)$ is :

A

2 A

B

8 A

C

4.5 A

D

4 A

Question 3: Palette 3/116

NEET 2026 MCQ

A room heater is rated $400 \mathrm{~W}, 220 \mathrm{~V}$. If the supply voltage drops to 200 V , what will be the power consumed (approximately)?

A

200 W

B

400 W

C

331 W

D

121 W

Question 4: Palette 4/116

NEET 2026 MCQ

A galvanometer of resistance $100 \Omega$ gives full scale deflection for a current of 1 mA . It is converted into an ammeter of range $0-10 \mathrm{~A}$. The shunt required is:

A

$0.01 \Omega$

B

$0.10 \Omega$

C

$1.0 \Omega$

D

$0.001 \Omega$

Question 5: Palette 5/116

NEET 2026 MCQ

In a metre bridge experiment (see figure), the positions of the cell, $E$, and galvanometer, $G$, are interchanged. We shall observe in the galvanometer:

A

Only the left-sided deflection

B

There will be no deflection irrespective of the position of the jockey

C

Only the right-sided deflection

D

Both right-sided and left-sided deflection and at balance point, no deflection

Question 6: Palette 6/116

NEET 2026 MCQ

Consider two circuits, (A) and (B), each having two resistors. One of them has a positive temperature coefficient of resistance, $+\alpha$, while the other one has a negative temperature of coefficient, $-\alpha$, as shown in the figure. The current through these circuits are denoted by $I_A$ and $I_B$. At initial temperature, the resistance of the two resistors is $R_0$. As the temperature is increased, the correct option that describes the variation of current in these circuits is:

A

Both $I_A$ and $I_B$ remain constant

B

$I_A$ remains constant while $I_B$ increases

C

$I_A$ decreases while $I_B$ increases

D

$I_A$ increases while $I_B$ decreases

Question 7: Palette 7/116

NEET 2025 MCQ

The current passing through the battery in the given circuit, is:

A

2.5 A

B

1.5 A

C

2.0 A

D

0.5 A

Question 8: Palette 8/116

NEET 2025 MCQ

A wire of resistance $R$ is cut into 8 equal pieces. From these pieces two equivalent resistances are made by adding four of these together in parallel. Then these two sets are added in series. The net effective resistance of the combination is:

A

$\frac{R}{16}$

B

$\frac{R}{8}$

C

$\frac{R}{64}$

D

$\frac{R}{32}$

Question 9: Palette 9/116

NEET 2025 MCQ

A constant voltage of 50 V is maintained between the points $A$ and $B$ of the circuit shown in the figure. The current through the branch $C D$ of the circuit is:

A

2.5 A

B

3.0 A

C

1.5 A

D

2.0 A

Question 10: Palette 10/116

NEET 2024 MCQ

A uniform wire of diameter $d$ carries a current of $100 \mathrm{~mA}$ when the mean drift velocity of electrons in the wire is $v$. For a wire of diameter $\frac{d}{2}$ of the same material to carry a current of $200 \mathrm{~mA}$, the mean drift velocity of electrons in the wire is

A

$4 v$

B

$8 v$

C

$v$

D

$2 v$

Question 11: Palette 11/116

NEET 2024 MCQ

A uniform metal wire of length $l$ has $10 \Omega$ resistance. Now this wire is stretched to a length $2l$ and then bent to form a perfect circle. The equivalent resistance across any arbitrary diameter of that circle is

A

$10 \Omega$

B

$5 \Omega$

C

$40 \Omega$

D

$20 \Omega$

Question 12: Palette 12/116

NEET 2024 MCQ

The given circuit shows a uniform straight wire $A B$ of $40 \mathrm{~cm}$ length fixed at both ends. In order to get zero reading in the galvanometer $G$, the free end of $J$ is to be placed from $B$ at:

A

32 cm

B

8 cm

C

16 cm

D

24 cm

Question 13: Palette 13/116

NEET 2024 MCQ

The terminal voltage of the battery, whose emf is $10 \mathrm{~V}$ and internal resistance $1 \Omega$, when connected through an external resistance of $4 \Omega$ as shown in the figure is:

A

4 V

B

6 V

C

8 V

D

10 V

Question 14: Palette 14/116

NEET 2024 MCQ

A wire of length '$l$' and resistance $100 \Omega$ is divided into 10 equal parts. The first 5 parts are connected in series while the next 5 parts are connected in parallel. The two combinations are again connected in series. The resistance of this final combination is:

A

$26 \Omega$

B

$52 \Omega$

C

$55 \Omega$

D

$60 \Omega$

Question 15: Palette 15/116

NEET 2024 MCQ

Two heaters $A$ and $B$ have power rating of $1 \mathrm{~kW}$ and $2 \mathrm{~kW}$, respectively. Those two are first connected in series and then in parallel to a fixed power source. The ratio of power outputs for these two cases is:

A

$1: 1$

B

$2: 9$

C

$1: 2$

D

$2: 3$

Question 16: Palette 16/116

NEET 2024 MCQ

Choose the correct circuit which can achieve the bridge balance.

A

B

C

D

Question 17: Palette 17/116

NEET 2023 MCQ

A certain wire $\mathrm{A}$ has resistance $81 ~\Omega$. The resistance of another wire $\mathrm{B}$ of same material and equal length but of diameter thrice the diameter of A will be :

A

$81 ~\Omega$

B

$9 ~\Omega$

C

$729 ~\Omega$

D

$243 ~\Omega$

Question 18: Palette 18/116

NEET 2023 MCQ

A copper wire of radius $1 \mathrm{~mm}$ contains $10^{22}$ free electrons per cubic metre. The drift velocity for free electrons when $10 \mathrm{~A}$ current flows through the wire will be (Given, charge on electron $=1.6 \times 10^{-19} \mathrm{C}$ ) :

A

$\frac{6.25 \times 10^4}{\pi} \mathrm{ms}^{-1}$

B

$\frac{6.25}{\pi} \times 10^3 \mathrm{~ms}^{-1}$

C

$\frac{6.25}{\pi} \mathrm{ms}^{-1}$

D

$\frac{6.25 \times 10^5}{\pi} \mathrm{ms}^{-1}$

Question 19: Palette 19/116

NEET 2023 MCQ

The emf of a cell having internal resistance $1 \Omega$ is balanced against a length of $330 \mathrm{~cm}$ on a potentiometer wire. When an external resistance of $2 \Omega$ is connected across the cell, the balancing length will be :

A

220 cm

B

330 cm

C

115 cm

D

332 cm

Question 20: Palette 20/116

NEET 2023 MCQ

The magnitude and direction of the current in the following circuit is :-

A

0.5 A from $A$ to $B$ through $E$

B

$\frac{5}{9} A$ from $A$ to $B$ through $E$

C

1.5 A from $B$ to $A$ through $E$

D

0.2 A from $B$ to $A$ through $E$

Question 21: Palette 21/116

NEET 2023 MCQ

If the galvanometer $G$ does not show any deflection in the circuit shown, the value of $R$ is given by:

A

50 $\Omega$

B

100 $\Omega$

C

400 $\Omega$

D

200 $\Omega$

Question 22: Palette 22/116

NEET 2023 MCQ

Resistance of a carbon resistor determined from colour codes is $(22000 \pm 5 \%) \Omega$. The colour of third band must be :

A

Green

B

Orange

C

Yellow

D

Red

Question 23: Palette 23/116

NEET 2023 MCQ

The resistance of platinum wire at $0^{\circ} \mathrm{C}$ is $2 ~\Omega$ and $6.8 ~\Omega$ at $80^{\circ} \mathrm{C}$. The temperature coefficient of resistance of the wire is :

A

$3 \times 10^{-3} \mathrm{C}^{-1}$

B

$3 \times 10^{-2} \mathrm{C}^{-1}$

C

$3 \times 10^{-10} \mathrm{C}^{-1}$

D

$3 \times 10^{-4} \mathrm{C}^{-1}$

Question 24: Palette 24/116

NEET 2023 MCQ

10 resistors, each of resistance $\mathrm{R}$ are connected in series to a battery of emf $E$ and negligible internal resistance. Then those are connected in parallel to the same battery, the current is increased $n$ times. The value of $n$ is :

A

100

B

1

C

1000

D

10

Question 25: Palette 25/116

NEET 2022 MCQ

The reciprocal of resistance is :

A

conductance

B

reactance

C

mobility

D

conductivity

Question 26: Palette 26/116

NEET 2022 MCQ

A cell of emf 4 V and internal resistance 0.5 $\Omega$ is connected to a 7.5 $\Omega$ external resistance. The terminal potential difference of the cell is

A

0.375 V

B

3.75 V

C

4.25 V

D

4 V

Question 27: Palette 27/116

NEET 2022 MCQ

The equivalent resistance of the infinite network given below is :

A

$\left( {1 + \sqrt 5 } \right)\Omega $

B

$2\,\Omega $

C

$\left( {1 + \sqrt 2 } \right)\Omega $

D

$\left( {1 + \sqrt 3 } \right)\Omega $

Question 28: Palette 28/116

NEET 2022 MCQ

The sliding contact C is at one fourth of the length of the potentiometer wire (AB) from A as shown in the circuit diagram. If the resistance of the wire AB is R₀, then the potential drop (V) across the resistor R is

A

${{2{V_0}R} \over {2{R_0} + 3R}}$

B

${{4{V_0}R} \over {3{R_0} + 16R}}$

C

${{4{V_0}R} \over {3{R_0} + R}}$

D

${{2{V_0}R} \over {4{R_0} + R}}$

Question 29: Palette 29/116

NEET 2022 MCQ

Two resistors of resistance, 100 $\Omega$ and 200 $\Omega$ are connected in parallel in an electrical circuit. The ratio of the thermal energy developed in 100 $\Omega$ to that in 200 $\Omega$ in a given time is

A

1 : 2

B

2 : 1

C

1 : 4

D

4 : 1

Question 30: Palette 30/116

NEET 2022 MCQ

A copper wire of length 10 m and radius $\left( {{{{{10}^{ - 2}}} \over {\sqrt \pi }}} \right)$ m has electrical resistance of 10 $\Omega$. The current density in the wire for an electric field strength of 10 (V/m) is

A

10⁴ A/m²

B

10⁶ A/m²

C

10^$-$5 A/m²

D

10⁵ A/m²

Question 31: Palette 31/116

NEET 2022 MCQ

A wheatstone bridge is used to determine the value of unknown resistance X by adjusting the variable resistance Y as shown in the figure. For the most precise measurement of X, the resistance P and Q

A

Should be approximately equal to 2X

B

Should be approximately equal and are small

C

Should be very large and unequal

D

Do not play any significant role

Question 32: Palette 32/116

NEET 2021 MCQ

In a potentiometer circuit a cell of EMF 1.5 V gives balance point at 36 cm length of wire. If another cell of EMF 2.5 V replaces the first cell, then at what length of the wire, the balance point occurs?

A

62 cm

B

60 cm

C

21.6 cm

D

64 cm

Question 33: Palette 33/116

NEET 2021 MCQ

The effective resistance of a parallel connection that consists of four wires of equal length, equal area of cross-section and same material is 0.25$\Omega$. What will be the effective resistance if they are connected in series?

A

4$\Omega$

B

0.25$\Omega$

C

0.5$\Omega$

D

1$\Omega$

Question 34: Palette 34/116

NEET 2021 MCQ

Column - I gives certain physical terms associated with flow of current through a metallic conductor. Column-II gives some mathematical relations involving electrical quantities. Match column-I and column-II with appropriate relations.

	Column - I		Column - II
(A)	Drift Velocity	(P)	${m \over {n{e^2}p}}$
(B)	Electrical Resistivity	(Q)	$ne{\upsilon _d}$
(C)	Relaxation Period	(R)	${{eE} \over m}\tau $
(D)	Current Density	(S)	${E \over J}$

A

(A)-(R); (B)-(Q); (C)-(S); (D)-(P)

B

(A)-(R); (B)-(S); (C)-(P); (D)-(Q)

C

(A)-(R); (B)-(S); (C)-(Q); (D)-(P)

D

(A)-(R); (B)-(P); (C)-(S); (D)-(Q)

Question 35: Palette 35/116

NEET 2021 MCQ

Three resistors having resistances r₁, r₂ and r₃ are connected as shown in the given circuit. The ratio ${{{i_3}} \over {{i_1}}}$ of currents in terms of resistances used in the circuit is :

A

${{{r_2}} \over {{r_1} + {r_3}}}$

B

${{{r_1}} \over {{r_2} + {r_3}}}$

C

${{{r_2}} \over {{r_2} + {r_3}}}$

D

${{{r_1}} \over {{r_1} + {r_2}}}$

Question 36: Palette 36/116

NEET 2020 MCQ

A resistance wire connected in the left gap of a metre bridge balances a 10 $\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 $\Omega $ of the resistance wire is :

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 37: Palette 37/116

NEET 2020 MCQ

The color code of a resistance is given below :

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 38: Palette 38/116

NEET 2020 MCQ

A charged particle having drift velocity 7.5$ \times $10^-4 ms^-1 in an electric field of 3$ \times $10^-10 Vm^-1 has a mobility in m² V^-1s^-1 of :

A

2.5 $ \times $10⁶

B

2.5 $ \times $10^-6

C

2.25 $ \times $10^-15

D

2.25 $ \times $10¹⁵

Question 39: Palette 39/116

NEET 2020 MCQ

Which of the following graph represents the variation of resistivity ($\rho $) with temperature (T) for copper?

A

B

C

D

Question 40: Palette 40/116

NEET 2020 MCQ

The solids which have the negative temperature coefficient of resistance are :

A

insulators only

B

semiconductors only

C

insulators and semiconductors

D

metals

Question 41: Palette 41/116

NEET 2019 MCQ

In the circuits shown below, the readings of voltmeters and the ammeters will be :

A

V₁ = V₂ and i₁ = i₂

B

V₁ > V₂ and i₁ > i₂

C

V₁ > V₂ and i₁ = i₂

D

V₁ = V₂ and i₁ > i₂

Question 42: Palette 42/116

NEET 2019 MCQ

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 :

A

4 : 9

B

9 : 4

C

1 : 2

D

2 : 1

Question 43: Palette 43/116

NEET 2019 MCQ

Which of the following acts as a circuit protection device?

A

inductor

B

conductor

C

switch

D

fuse

Question 44: Palette 44/116

NEET 2018 MCQ

A carbon resistor of (47 $ \pm $ 4.7) k$\Omega $ is to be marked with rings of different colours for its identification. The colour code sequence will be

A

Violet – Yellow – Orange – Silver

B

Yellow – Violet – Orange – Silver

C

Yellow – Green – Violet – Gold

D

Green – Orange – Violet – Gold

Question 45: Palette 45/116

NEET 2018 MCQ

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?

A

B

C

D

Question 46: Palette 46/116

NEET 2018 MCQ

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 10I. The value of n is

A

10

B

11

C

20

D

9

Question 47: Palette 47/116

NEET 2017 MCQ

A potentiometer is an accurate and versatile device to make electrical measurements of EMF because the method involves

A

potential gradients

B

a condition of no current flow through the galvanometer

C

a combination of cells, galvanometer and resistances

D

cells

Question 48: Palette 48/116

NEET 2017 MCQ

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

A

${R \over n}$

B

n²R

C

${R \over {{n^2}}}$

D

nR

Question 49: Palette 49/116

NEET 2016 MCQ

The potential difference (V_A $-$ V_B) between the points A and B in the given figure is

A

$-$ 3V

B

+3 V

C

+6 V

D

+9 V

Question 50: Palette 50/116

NEET 2016 MCQ

A filament bulb (500 W, 100 V) is to be used in a 230 V main supply. When a resistance R is connected in series, it works perfectly and the bulb consumes 500 W. The value of R is

A

230 $\Omega $

B

46 $\Omega $

C

26 $\Omega $

D

13 $\Omega $

Question 51: Palette 51/116

NEET 2016 MCQ

The charge flowing through a resistance R varies with time t is Q = at $-$ bt², where $a$ and $b$ are positive constants. The total heat produced in R is

A

${{{a^3}R} \over {2b}}$

B

${{{a^3}R} \over {b}}$

C

${{{a^3}R} \over {6b}}$

D

${{{a^3}R} \over {3b}}$

Question 52: Palette 52/116

NEET 2016 MCQ

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

A

3 : 4

B

3 : 2

C

5 : 1

D

5 : 4

Question 53: Palette 53/116

NEET 2015 MCQ

Two metal wires of identical dimensions are connected in series. If $\sigma $₁ and $\sigma $₂ are the conductivity of the combination is

A

${{{\sigma _1} + {\sigma _2}} \over {{\sigma _1}{\sigma _2}}}$

B

${{{\sigma _1}{\sigma _2}} \over {{\sigma _1} + {\sigma _2}}}$

C

${{2{\sigma _1}{\sigma _2}} \over {{\sigma _1} + {\sigma _2}}}$

D

${{{\sigma _1} + {\sigma _2}} \over {2{\sigma _1}{\sigma _2}}}$

Question 54: Palette 54/116

NEET 2015 MCQ

A circuit contains an ammeter, a battery of 30 V and a resistance 40.8 ohm all connected in series. If the ammeter has a coil of resistance 480 ohm and a shunt of 20 ohm, the reading in the ammeter will be

A

2A

B

1A

C

0.5 A

D

0.25 A

Question 55: Palette 55/116

NEET 2015 MCQ

A potentiometer wire of length L and a resistance r are connected in series with a battery of e.m.f. E₀ and a resistance r₁. An unknown e.m.f. E is balanced at a length $l$ of the potentiometer wire. The e.m.f. E will be given by

A

${{{E_0}l} \over L}$

B

${{L{E_0}r} \over {\left( {r + {r_1}} \right)l}}$

C

${{L{E_0}r} \over {l{r_1}}}$

D

${{{E_0}r} \over {\left( {r + {r_1}} \right)}}.{l \over L}$

Question 56: Palette 56/116

NEET 2015 MCQ

Across a metallic conductor of non-uniform cross section a constant potential difference is applied. The quantity which remains constant along the conductor is

A

drift velocity

B

electric field

C

current density

D

current

Question 57: Palette 57/116

NEET 2015 MCQ

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 e.m.f. 2 V, so as to get a potential gradient 1 mV per cm on the wire is

A

44 $\Omega $

B

48 $\Omega $

C

32 $\Omega $

D

40 $\Omega $

Question 58: Palette 58/116

NEET 2015 MCQ

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, Then

A

V_A = V_B $ \ne $ V_C

B

V_A $ \ne $ V_B $ \ne $ V_C

C

V_A = V_B = V_C

D

V_A $ \ne $ V_B = V_C

Question 59: Palette 59/116

NEET 2014 MCQ

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. The resistance R is

A

10 $\Omega $

B

15 $\Omega $

C

20 $\Omega $

D

25 $\Omega $

Question 60: Palette 60/116

NEET 2014 MCQ

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 volt and the average resistance per km is 0.5 $\Omega $. The power loss in the wire is

A

19.2 W

B

19.2 kW

C

19.2 J

D

12.2 kW

Question 61: Palette 61/116

NEET 2014 MCQ

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 (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 62: Palette 62/116

NEET 2013 MCQ

Ten identical cells connected in series are needed to heat a wire of length one meter and radius 'r' by 10^oC in time 't'. How many cells will be required to heat the wire of length two meter of the same radius by the same temperature in time 't' ?

A

20

B

30

C

40

D

10

Question 63: Palette 63/116

NEET 2013 MCQ

Two rods are joined end to end, as shown. Both have a cross-sectional area of 0.01 cm². Each is 1 meter long. One rod is of copper with a resistivity of 1.7 $ \times $ 10^$-$6 ohm-centimeter, the other is of iron with a resistivity of 10^$-$5 ohm-centimeter.

How much voltage is required to produce a current of 1 ampere in the rods?

A

0.00145 V

B

0.0145 V

C

1.7 $ \times $ 10^$-$6 V

D

0.117 V

Question 64: Palette 64/116

NEET 2013 MCQ

A 12 cm wire is given a shape of a right angled triangle ABC having sides 3 cm, 4 cm and 5 cm as shown in the figure. The resistance between two ends (AB, BC, CA) of the respective sides are measuread one by one ratio

A

9 : 16 : 25

B

27 : 32 : 35

C

21 : 24 : 25

D

3 : 4 : 5

Question 65: Palette 65/116

NEET 2013 MCQ

The resistances of the four arms P, Q, R and S in a Wheatstone's bridge are 10 ohm, 30 ohm, 30 ohm and 90 ohm, respectively. The e.m.f. and internal resistance of the cell are 7 volt and 5 ohm respectively. If the galvanometer resistance is 50 ohm, the current drawn from the celll will be

A

0.1 A

B

2.0 A

C

1.0 A

D

0.2 A

Question 66: Palette 66/116

NEET 2013 MCQ

A wire of resistance 4 $\Omega $ is stretched to twice its original length. The resistance of stretched wire would be

A

8 $\Omega $

B

16 $\Omega $

C

2 $\Omega $

D

4 $\Omega $

Question 67: Palette 67/116

NEET 2013 MCQ

The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of 10 $\Omega $ is

A

0.8 $\Omega $

B

1.0 $\Omega $

C

0.2 $\Omega $

D

0.5 $\Omega $

Question 68: Palette 68/116

NEET 2012 MCQ

A cell having an emf $\varepsilon $ and internal resistance r is connected across a variable external resistance R. As the resistance R is increased, the plot of potential difference V across R is given by

A

B

C

D

Question 69: Palette 69/116

NEET 2012 MCQ

The power dissipated in the circuit shown in the figure is 30 watts. The value of R is

A

20 $\Omega $

B

15 $\Omega $

C

10 $\Omega $

D

30 $\Omega $

Question 70: Palette 70/116

NEET 2012 MCQ

In the circuit shown the cells A and B have negligible resistances. For V_A = 12 V, R₁ = 500 $\Omega $ and R = 100 $\Omega $ the galvanometer (G) shows no deflection. The value of V_s is

A

4 V

B

2 V

C

12 V

D

6 V

Question 71: Palette 71/116

NEET 2012 MCQ

If voltage across a bulb rated 220 volt-100 watt drops by 2.5% of its rated value, the percentage of the rated value by which the power would decrease is

A

20%

B

2.5%

C

5%

D

10%

Question 72: Palette 72/116

NEET 2012 MCQ

A ring is made of a wire having a resistance R₀ = 12 $\Omega $. Find the points A and B, as shown in the figure, at which a current carrying conductor should be connected so that the resistance R of the sub circuit between these point is equal to ${8 \over 3}\Omega $.

A

${{{l_1}} \over {{l_2}}} = {5 \over 8}$

B

${{{l_1}} \over {{l_2}}} = {1 \over 3}$

C

${{{l_1}} \over {{l_2}}} = {3 \over 8}$

D

${{{l_1}} \over {{l_2}}} = {1 \over 2}$

Question 73: Palette 73/116

NEET 2011 MCQ

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

A

+1 V

B

$-$1 V

C

+2 V

D

$-$2 V

Question 74: Palette 74/116

NEET 2011 MCQ

A thermocouple of negligible resistance produces an e.m.f. of 40 µV/ºC in the linear range of temperature. A galvanometer of resistance 10 ohm whose sensitivity is 1 µA/division, is employed with the thermocouple. The smallest value of temperature difference that can be detected by the system will be

A

1ºC

B

0.5 ºC

C

0.1ºC

D

0.25ºC

Question 75: Palette 75/116

NEET 2011 MCQ

A current of 2 A flows through a 2 $\Omega $ resistor when connected across a battery a 2 $\Omega $ resistor when connected across a battery. The same battery supplies a current of 0.5 A when connected across a 9 $\Omega $ resistor. The internal resistance of the battery is

A

0.5 $\Omega $

B

1/3 $\Omega $

C

1/4 $\Omega $

D

1 $\Omega $

Question 76: Palette 76/116

NEET 2011 MCQ

If power dissipated in the 9 $\Omega $ resistor in the circuit shown is 36 watt, the potential difference across the 2 $\Omega $ resistor is

A

4 volt

B

8 volt

C

10 volt

D

2 volt

Question 77: Palette 77/116

NEET 2010 MCQ

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 length $l$₁ cm and $l$₂ cm respectively. The magnitudes, of the resistors R and X, in ohms, are then, equal, respectively, to

A

$k({l_2} - {l_1})$ and $k{l_2}$

B

$k{l_1}$ and $k({l_2} - {l_1})$

C

$k\left( {{l_2} - {l_1}} \right)$ and $k{l_1}$

D

$k{l_1}$ and $k{l_2}$

Question 78: Palette 78/116

NEET 2010 MCQ

Consider the following two statements.
(A)  Kirchoff's junction law follows from the conservation of charge.
(B)  Kirchhoff's loop law follows from the conservation of energy.

Which of the following is correct?

A

Both (A) and (B) are wrong

B

(A) is correct and (B) is wrong

C

(A) is wrong and (B) is correct

D

Both (A) and (B) are correct

Question 79: Palette 79/116

NEET 2009 MCQ

A wire of resistance 12 ohms per meter is bent to form a complete circle of radius 10 cm. The resistance between its two diametrically opposite points, A and B as shown in the figure is

A

$3\,\Omega $

B

$6\pi \,\Omega $

C

$6\,\Omega $

D

$0.6\pi \,\Omega $

Question 80: Palette 80/116

NEET 2009 MCQ

The mean free path of electrons in a metal is 4 $ \times $ 10^$-$8 m. The electric field which can give on an average 2 eV energy to an electron in the metal will be in units V/m

A

$5 \times {10^{ - 11}}$

B

8 $ \times $ 10^$-$11

C

5 $ \times $ 10⁷

D

8 $ \times $ 10⁷

Question 81: Palette 81/116

NEET 2009 MCQ

See the electrical circuit shown in this figure. Which of the following equations is a correct equation for it ?

A

${\varepsilon _2} - {i_2}{r_2} - {\varepsilon _1} - {i_1}{r_1} = 0$

B

$ - {\varepsilon _2} - \left( {{i_1} + {i_2}} \right)R + {i_2}{r_2} = 0$

C

${\varepsilon _1} - \left( {{i_1} + {i_2}} \right)R + {i_1}{r_1} = 0$

D

${\varepsilon _1} - \left( {{i_1} + {i_2}} \right)R - {i_1}{r_1} = 0$

Question 82: Palette 82/116

NEET 2009 MCQ

A student measures the terminal potential difference (V) of a cell (of emf $\varepsilon $ and internal resistance r) as a function of the current (I) flowing through it. The slope, and intercept, of the graph between V and I, then respectively, equal

A

$-$ r and $\varepsilon $

B

r and $-$ $\varepsilon $

C

$-$ $\varepsilon $ and r

D

$\varepsilon $ and $-$ r

Question 83: Palette 83/116

NEET 2008 MCQ

In the circuit shown, the current through the 4 $\Omega $ resistor is 1 amp when the points P and M are connected to a d.c. voltage source. The potential difference betwen the points M and N is

A

0.5 volt

B

3.2 volt

C

1.5 volt

D

1.0 volt

Question 84: Palette 84/116

NEET 2008 MCQ

A wire of a certain material is stretched slowly by ten percent. Its new resistance and specific resistance become respectively

A

both remain the same

B

1.1 times, 1.1 times

C

1.2 times, 1.1 times

D

1.21 times, same

Question 85: Palette 85/116

NEET 2008 MCQ

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

A

2.0 ohm

B

zero

C

1.0 ohm

D

0.5 ohm

Question 86: Palette 86/116

NEET 2008 MCQ

A current of 3 amp. flows through the 2 $\Omega $ resistor shown in the circuit. The power dissipated in the 5 $\Omega $ resistor is

A

1 watt

B

5 watt

C

4 watt

D

2 watt

Question 87: Palette 87/116

NEET 2008 MCQ

An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from temperature 20^oC ? The temperature of boiling water is 100^oC

A

12.6 min

B

4.2 min

C

6.3 min

D

8.4 min

Question 88: Palette 88/116

NEET 2007 MCQ

The total power dissipated in watt in the circuit shown here is

A

40

B

54

C

4

D

16

Question 89: Palette 89/116

NEET 2007 MCQ

Three resistances, P, Q, R each of 2$\Omega $ and an unknown resistance S from the four arms of a Wheatstone bridge circuit. When a resistance of 6 $\Omega $ is connected in parallel to S the bridge gets balanced. What is the value of S?

A

3 $\Omega $

B

6 $\Omega $

C

1 $\Omega $

D

2 $\Omega $.

Question 90: Palette 90/116

NEET 2006 MCQ

Power dissipated across the 8 $\Omega $ resistor in the circuit shown here is 2 watt. The power dissipated in watt units across the 3 $\Omega $ resistor is

A

3.0

B

2.0

C

1.0

D

0.5

Question 91: Palette 91/116

NEET 2006 MCQ

Kirchoff's first and second laws of electrical circuits are consequences of

A

conservation of energy and electric charge respectively

B

conservation of energy

C

conservation of electric charhge and energy respectively

D

conservation of electric charge.

Question 92: Palette 92/116

NEET 2006 MCQ

Two cells, having the same e.m.f. are connected in series through an external resistance R. Cells have internal resistances r₁ and r₂ (r₁ > r₂) respectively. When the circuit is closed, the potential difference across the first cell is zero. The value of R is

A

r₁ + r₂

B

r₁ $-$ r₂

C

${{{r_1} + {r_2}} \over 2}$

D

${{{r_1} - {r_2}} \over 2}$

Question 93: Palette 93/116

NEET 2006 MCQ

In the circuit shown, if a conducting wire is connected between points A and B, the current in this wire will

A

flow from B to A

B

flow from A to B

C

flow in the direction which will be decided by the value of V be zero.

D

be zero

Question 94: Palette 94/116

NEET 2005 MCQ

For the network shown in the figure the value of the current $i$ is

A

${{9V} \over {35}}$

B

${{18V} \over 5}$

C

${{5V} \over 9}$

D

${{5V} \over {18}}$

Question 95: Palette 95/116

NEET 2005 MCQ

A 5-ampere fuse wire can withstand a maximum power of 1 watt in the circuit. The resistance of the fuse wire is

A

0.04 ohm

B

0.2 ohm

C

5 ohm

D

0.4 ohm

Question 96: Palette 96/116

NEET 2005 MCQ

When a wire of uniform cross-section $a$ length $l$ and resistance R is bent into a complete circle. resistance between any two of diametrically opposite points will be

A

R/4

B

4R

C

R/8

D

R/2

Question 97: Palette 97/116

NEET 2005 MCQ

Two batteries, one of emf 18 volts and internal resistance 2 $\Omega $ and the other of emf 12 volts and internal resistance 1 $\Omega $, are connected as shown. The voltmeter V will record a reading of

A

30 volt

B

18 volt

C

15 volt

D

14 volt

Question 98: Palette 98/116

NEET 2004 MCQ

A 6 volt battery is connected to the terminals of a three metre long wire of uniform thickness and resistance of 100 ohm. The difference of potential between two points on the wire separated by a distance of 50 cm will be

A

2 volt

B

3 volt

C

1 volt

D

1.5 volt

Question 99: Palette 99/116

NEET 2004 MCQ

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

A

R

B

2R

C

R/4

D

R/2

Question 100: Palette 100/116

NEET 2004 MCQ

Five equal resistances each of resistances 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

A

${{3V} \over R}$

B

${V \over R}$

C

${V \over {2R}}$

D

${{2V} \over R}$

Question 101: Palette 101/116

NEET 2004 MCQ

The electric resistance of a certain wire of iron is R. If its length and radius are both doubled, then

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 102: Palette 102/116

NEET 2004 MCQ

Resistance 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

n²R

B

R/n²

C

R/n

D

nR

Question 103: Palette 103/116

NEET 2004 MCQ

when three identical bulbs of 60 watt, 200 volt rating are connected in series to a 200 volt supply, the power drawn by them will be

A

60 watt

B

180 watt

C

10 watt

D

20 watt

Question 104: Palette 104/116

NEET 2003 MCQ

Fuse wire is a wire of

A

high resistance and high melting point

B

high resistance and low melting point

C

low resistance and low melting point

D

low resistance and high melting point

Question 105: Palette 105/116

NEET 2003 MCQ

An electric kettle has two heating coils. When one of the coils is connected to an a.c. source, the water in the kettle boils in 10 minutes. When the other coil is used the water boils in 40 minutes. If both the coils are connected in parallel, the time taken by the same quantity of water to boil will be

A

8 minutes

B

4 minutes

C

25 minutes

D

15 minutes

Question 106: Palette 106/116

NEET 2003 MCQ

Two 220 volt, 100 watt bulbs are connected first in series and then in parallel. Each time the combination is connected to a 220 volt a.c. supply line. The power drawn by the combination in each case respectively will be

A

50 watt, 100 watt

B

100 watt, 50 watt

C

200 watt, 150 watt

D

50 watt, 200 watt

Question 107: Palette 107/116

NEET 2003 MCQ

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

A

R/4

B

R/2

C

R

D

2R

Question 108: Palette 108/116

NEET 2002 MCQ

Specific resistance of a conductor increases with

A

increase in temperature

B

increase in cross-section area

C

increase in cross-section and decrease in length

D

decrease in cross secton area.

Question 109: Palette 109/116

NEET 2002 MCQ

For a cell terminal potential difference is 2.2V when circuit is open and reduce to 1.8 V when cell is connected to a resistance of R = 5 $\Omega $. Determine internal resistance of cell (r)

A

${{10} \over 9}\Omega $

B

${{9} \over 10}\Omega $

C

${{11} \over 9}\Omega $

D

${{5} \over 9}\Omega $

Question 110: Palette 110/116

NEET 2001 MCQ

Copper and silicon is cooled from 300 K to 60 K , the specific resistance

A

decrease in copper but increase in silicon

B

increase in copper but decrease in silicon

C

increase in both

D

decrease in both

Question 111: Palette 111/116

NEET 2001 MCQ

If specific resistance of a potentiometer wire is 10^-7$\Omega $ m and current flow through it is 0.1 amp., cross-sectional area of wire is 10^$-$6 m² then potential gradient will be

A

10^$-$2 volt/m

B

10^$-$4 volt/m

C

10^$-$6 volt/m

D

10^$-$8 volt/m.

Question 112: Palette 112/116

NEET 2001 MCQ

The resistance of each arm of the Wheatstone's bridge is 10 ohm. A resistance of 10 ohm is connected in series with a galvanometer then the equivalent resistance across the battery will be

A

10 ohm

B

15 ohm

C

20 ohm

D

40 ohm

Question 113: Palette 113/116

NEET 2000 MCQ

The potentiometer is best for measuring voltage, as

A

it has a sensitive galvanometer and gives null deflection

B

it has wire of high resistance

C

it measures p.d. in closed circuit

D

it measures p.d in open circuit.

Question 114: Palette 114/116

NEET 2000 MCQ

Two bulbs of (40 W, 200 V), and (100 W, 200 V). Then correct relation for their resistances

A

R₄₀ < R₁₀₀

B

R₄₀ > R₁₀₀

C

R₄₀ = R₁₀₀

D

no relation can be predicted.

Question 115: Palette 115/116

NEET 2000 MCQ

A car battery of emf 12 V and internal resistance $5 \times {10^{ - 2}}$ $\Omega $., receives a current of 60 amp, from external source, then terminal potential difference of battery is

A

12 V

B

9 V

C

15 V

D

20 V

Question 116: Palette 116/116

NEET 2000 MCQ

The net resistance of the circuit between A and B is

A

${8 \over 3}\Omega $

B

${14 \over 3}\Omega $

C

${{16} \over 3}\Omega $

D

${{22} \over 3}\Omega $