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BITSAT SERIES
Physics

Current Electricity

33 previous year questions.

Volume: 33 Ques
Yield: High

High-Yield Trend

4
2025
3
2021
4
2020
2
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2012
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2011
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2010
2
2007

Chapter Questions
33 MCQs

01
PYQ 2007
medium
physics ID: bitsat-2
In the circuit, the potential difference across will be nearest to
1
9.6 V
2
6.6 V
3
4.8 V
4
3.2 V
02
PYQ 2007
easy
physics ID: bitsat-2
The relation between voltage sensitivity and current sensitivity of a moving coil galvanometer is (resistance of galvanometer is G).
1
2
3
4
03
PYQ 2010
medium
physics ID: bitsat-2
Which of the following quantities does not change when a resistor connected to a battery is heated due to the current?
1
Drift speed
2
Resistivity
3
Resistance
4
Number of free electrons
04
PYQ 2011
easy
physics ID: bitsat-2
A steady current flow in a metallic conductor of non-uniform cross-section. The quantity/quantities remaining constant along the whole length of the conductor is/are
1
current, electric field and drift speed
2
drift speed only
3
current and drift speed
4
current only
05
PYQ 2012
medium
physics ID: bitsat-2

The r.m.s. value of potential difference shown in the figure is:

1

2

3

4

06
PYQ 2013
medium
physics ID: bitsat-2
What should be the characteristic of fuse wire?
1
High melting point, high specific resistance.
2
Low melting point, low specific resistance.
3
High melting point, low specific resistance.
4
Low melting point, high specific resistance.
07
PYQ 2014
medium
physics ID: bitsat-2

For the circuit shown, the current is to be measured. The ammeter shown is a galvanometer with resistance converted into an ammeter by a shunt resistance . The value of the current is:

1

2

3

4
08
PYQ 2014
medium
physics ID: bitsat-2
For a CE transistor amplifier, the audio signal voltage across the collector resistance of is . Suppose the current amplification factor of the transistor is 100. What should be the value of in series with supply of if the base current has to be 10 times the signal current?
1

2

3

4
09
PYQ 2014
medium
physics ID: bitsat-2
Two coaxial non-conducting cylinders of radius and are separated by a material of conductivity and a constant potential difference is maintained between them by a battery. The current per unit length flowing from one cylinder to the other is:
1

2

3

4
10
PYQ 2015
medium
physics ID: bitsat-2
A constant voltage is applied between the two ends of a uniform metallic wire. Some heat is developed in it. The heat developed is doubled if:
1
both the length and the radius of the wire are halved
2
both the length and the radius of the wire are doubled
3
the radius of the wire is doubled
4
the length of the wire is doubled
11
PYQ 2015
medium
physics ID: bitsat-2
A direct current of is superposed on an alternating current flowing through the same wire. The effective value of the resulting current will be:
1

2

3

4
12
PYQ 2016
medium
physics ID: bitsat-2

In the circuit shown in the figure, find the current in the 45Ω resistor.

1

2

3

4
None of these
13
PYQ 2016
medium
physics ID: bitsat-2

An inductor of inductance L = 400mH and resistors of resistance R₁ = 2Ω and R₂ = 2Ω are connected to a battery of emf 12V as shown in the figure. The internal resistance of the battery is negligible. The switch S is closed at t = 0. The potential drop across L as a function of time is:

1

2

3

4
6e⁻5tV
14
PYQ 2016
medium
physics ID: bitsat-2

In the shown arrangement of the meter bridge AC corresponding to null deflection of galvanometer is x. What would be its value if the radius of the wire AB is doubled?

1

2

3

4
2x
15
PYQ 2016
medium
physics ID: bitsat-2
The drift velocity of electrons in a silver wire with cross–sectional area 3.14×10⁻6m² carrying a current of 20A is to be calculated. Given: atomic weight of Ag =108, density of silver =10.5×10³kg m⁻3.
1

2

3

4
6.798×10⁻4m s⁻1
16
PYQ 2017
medium
physics ID: bitsat-2

A meter bridge is set up as shown to determine an unknown resistance X using a standard 10 ohm resistor. The galvanometer shows null point at 52 cm mark. The end corrections are 1 cm and 2 cm respectively for the ends A and B. The determined value of X is

1
10.2 ohm
2
10.6 ohm
3
10.8 ohm
4
11.1 ohm
17
PYQ 2017
medium
physics ID: bitsat-2

A wire is connected to a battery between the points M and N as shown in figure (1). The same wire is bent in the form of a square and then connected to the battery between the points M and N as shown in figure (2). Which of the following quantities increases?

1
Heat produced in the wire and resistance offered by the wire
2
Resistance offered by the wire and current through the wire
3
Heat produced in the wire, resistance offered by the wire and current through the wire
4
Heat produced in the wire and current through the wire
18
PYQ 2017
medium
physics ID: bitsat-2

In the circuit shown in the figure the current through the resistor is

1
the 3Ω resistor is 0.50A
2
the 3Ω resistor is 0.25A
3
the 4Ω resistor is 0.50A
4
the 4Ω resistor is 0.25A
19
PYQ 2018
medium
physics ID: bitsat-2

A 10V battery with internal resistance 1Ω and a 15V battery with internal resistance 0.6Ω are connected in parallel to a voltmeter (see figure). The reading in the voltmeter will be close to:

1
12.5 V
2
24.5 V
3
13 V
4
11.9 V
20
PYQ 2018
medium
physics ID: bitsat-2

Seven resistances, each of value 20Ω, are connected to a 2V battery as shown. The ammeter reading will be:

1

2

3

4
(7)/(10)A
21
PYQ 2019
medium
physics ID: bitsat-2
A constant voltage is applied between the two ends of a uniform metallic wire. Some heat is developed in it. The heat developed is doubled if
1
both the length and the radius of the wire are halved
2
both the length and the radius of the wire are doubled
3
the radius of the wire is doubled
4
the length of the wire is doubled
22
PYQ 2019
medium
physics ID: bitsat-2
A direct current of 5A is superposed on an alternating current I = 10sin ω t flowing through a wire. The effective value of the resulting current will be
1

2

3

4
15A
23
PYQ 2020
medium
physics ID: bitsat-2

An inductor of inductance L = 400mH and resistors of resistance R₁ = 2Ω and R₂ = 2Ω are connected to a battery of emf 12V as shown in the figure. The internal resistance of the battery is negligible. The switch S is closed at t=0. The potential drop across R₁ as a function of time is:

1

2

3

4
6e⁻5tV
24
PYQ 2020
medium
physics ID: bitsat-2

In the circuit shown in the figure, find the current in the 45Ω resistor.

1

2

3

4
None of these
25
PYQ 2020
medium
physics ID: bitsat-2

In the shown arrangement of the experiment of the meter bridge, if AC corresponding to null deflection of galvanometer is x, what would be its value if the radius of the wire AB is doubled?

1

2

3

4
2x
26
PYQ 2020
medium
physics ID: bitsat-2
The drift velocity of electrons in a silver wire with cross-sectional area 3.14×10⁻6m² carrying a current of 20A is. Atomic weight of Ag = 108, density of silver = 10.5×10³kg m⁻3.
1

2

3

4
6.798×10⁻4m/s
27
PYQ 2021
hard
physics ID: bitsat-2

In the circuit shown in figure, the current through the given resistor is

1
the 3Ω resistor is 0.50A.
2
the 3Ω resistor is 0.25A.
3
the 4Ω resistor is 0.50A.
4
the 4Ω resistor is 0.25A.
28
PYQ 2021
medium
physics ID: bitsat-2

A wire is connected to a battery between the points M and N as shown in figure
(1). The same wire is bent in the form of a square and then connected to the battery between the points M and N as shown in figure
(2). Which of the following quantities increases?

1
Heat produced in the wire and resistance offered by the wire
2
Resistance offered by the wire and current through the wire
3
Heat produced in the wire, resistance offered by the wire and current through the wire
4
Heat produced in the wire and current through the wire
29
PYQ 2021
medium
physics ID: bitsat-2

In the circuit given below, V(t) is the sinusoidal voltage source. Voltage drop VAB(t) across the resistance R is

1
is half wave rectified
2
is full wave rectified
3
has the same peak values in the positive and negative half cycles
4
has different peak values during positive and negative half cycle
30
PYQ 2025
easy
physics ID: bitsat-2
A current of 3 A flows through a resistor of resistance 4 Ω for 2 minutes. The heat produced is:
1
4320 J
2
4720 J
3
4960 J
4
4360 J
31
PYQ 2025
easy
physics ID: bitsat-2
Three resistors of , , and are connected in parallel. What is the equivalent resistance of the combination?
1

2

3

4

32
PYQ 2025
easy
physics ID: bitsat-2
Two resistors, 4 and 6 , are connected in parallel to a 12 V battery. What is the total current drawn from the battery?
1
3 A
2
5 A
3
4 A
4
6 A
33
PYQ 2025
easy
physics ID: bitsat-2
The equivalent resistance between points A and B in a circuit with two resistors of 6 each connected in parallel is:
1
12
2
6
3
3
4
4