Class 12 Physics - Chapter 3: Current Electricity MCQ Questions

10 Questions 20 Minutes

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Your Class 12 Physics Study Path

Question 1

A 18

B 2

C 8/9

D 4/9

Question 2

Which of the following characteristics of electrons determines the current in a conductor?

A Neither drift nor thermal velocity.

B Both drift velocity and thermal velocity.

C Thermal velocity alone.

D Drift velocity alone.

Question 3

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 emfs is

A 3 : 2

B 3 : 4

C 5 : 4

D 5 : 1

Question 4

A resistance R is to be measured using a meter bridge. A student chooses the standard resistance S to be 100 â„¦. He finds the null point at l₁ = 2.9 cm. He is told to attempt to improve the accuracy. Which of the following is a useful way?

A He should give up hope of a more accurate measurement with a meter bridge.

B He should change S to 3 â„¦ and repeat the experiment.

C He should change S to 1000 â„¦ and repeat the experiment.

D He should measure l₁ more accurately.

Question 5

The temperature co-efficient of resistance of a wire is 0.00125 Â°C^-1. At 300 K its resistance is 1 â„¦. The resistance of the wire will be 2 â„¦ at

A 1400 K

B 600 K

C 1127 K

D 1154 K

Question 6

A None of these

C 3.8 V

D 2 V

Question 7

Masses of three wires are in the ratio 1 : 3 : 5 and their lengths are in the ratio 5 : 3 : 1. The ratio of their electrical resistance is

A 125 : 15 : 1

B 1 : 15 : 125

C 5 : 3 : 1

D 1 : 3 : 5

Question 8

A When R is increased, the neutral point shifts to left.

B When the jockey contacts a point on the metre wire to the right of D, current flows from B to the wire through galvanometer.

C When the jockey contacts a point on metre wire left of D, current flows to B from the wire.

D The metre bridge will have at least two neutral points for this set of resistances.

Question 9

Kirchhoffâ€™s junction rule is a reflection of

A the fact that there is accumulation of charges at a junction.

B the fact that the momentum with which a charged particle approaches a junction is unchanged (as a vector) as the charged particle leaves the junction.

C conservation of charge.

D conservation of current density vector.

Question 10

Two cells of emfs approximately 5 V and 10 V are to be accurately compared using a potentiometer of length 400 cm.

A Potentiometer is usually used for comparing resistances and not voltages.

B The first portion of 50 cm of wire itself should have a potential drop of 10 V.

C The battery of potentiometer can have a voltage of 15 V and R adjusted so that the potential drop across the wire slightly exceeds 10 V.

D The battery that runs the potentiometer should have voltage of 8 V.

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Class 12 Physics - Chapter 3: Current Electricity MCQ Questions

Your Class 12 Physics Study Path

Which of the following characteristics of electrons determines the current in a conductor?

A resistance R is to be measured using a meter bridge. A student chooses the standard resistance S to be 100 â„¦. He finds the null point at l₁ = 2.9 cm. He is told to attempt to improve the accuracy. Which of the following is a useful way?

The temperature co-efficient of resistance of a wire is 0.00125 Â°C^-1. At 300 K its resistance is 1 â„¦. The resistance of the wire will be 2 â„¦ at

Masses of three wires are in the ratio 1 : 3 : 5 and their lengths are in the ratio 5 : 3 : 1. The ratio of their electrical resistance is

Kirchhoffâ€™s junction rule is a reflection of

Two cells of emfs approximately 5 V and 10 V are to be accurately compared using a potentiometer of length 400 cm.

Practice Complete!

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Grade Calculator

Marks Percentage Calculator

Percentage Calculator

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Quick Links

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Class 12 Physics - Chapter 3: Current Electricity MCQ Questions

Your Class 12 Physics Study Path

Which of the following characteristics of electrons determines the current in a conductor?

A resistance R is to be measured using a meter bridge. A student chooses the standard resistance S to be 100 â„¦. He finds the null point at l1 = 2.9 cm. He is told to attempt to improve the accuracy. Which of the following is a useful way?

The temperature co-efficient of resistance of a wire is 0.00125 Â°C-1. At 300 K its resistance is 1 â„¦. The resistance of the wire will be 2 â„¦ at

Masses of three wires are in the ratio 1 : 3 : 5 and their lengths are in the ratio 5 : 3 : 1. The ratio of their electrical resistance is

Kirchhoffâ€™s junction rule is a reflection of

Two cells of emfs approximately 5 V and 10 V are to be accurately compared using a potentiometer of length 400 cm.

Practice Complete!

Related Student Tools

Grade Calculator

Marks Percentage Calculator

Percentage Calculator

Students Also Read

Discover More on SaralStudy

Latest Blogs

Popular Blogs

Quick & Popular Links

Quick Links

Popular Study Links

What Students Are Viewing

A resistance R is to be measured using a meter bridge. A student chooses the standard resistance S to be 100 â„¦. He finds the null point at l₁ = 2.9 cm. He is told to attempt to improve the accuracy. Which of the following is a useful way?

The temperature co-efficient of resistance of a wire is 0.00125 Â°C^-1. At 300 K its resistance is 1 â„¦. The resistance of the wire will be 2 â„¦ at