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Question (11)

QN0036382

A 12 V battery moves 3 C of charge between two points. The work done is:

(A) 4 J
(B) 9 J
(C) 36 J
(D) 48 J

Correct Answer: C

Explanation:

W = VQ = 12 × 3 = 36 J.

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Question (12)

QN0036383

According to Ohm’s law, at constant temperature, the potential difference across a conductor is:

(A) Inversely proportional to current
(B) Directly proportional to current
(C) Independent of current
(D) Equal to resistance

Correct Answer: B

Explanation:

According to Ohm’s law, V ∝ I at constant temperature.

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Question (13)

QN0036384

A resistor has a potential difference of 20 V across it and carries 4 A current. Its resistance is:

(A) 5 Ω
(B) 16 Ω
(C) 24 Ω
(D) 80 Ω

Correct Answer: A

Explanation:

R = V/I = 20/4 = 5 Ω.

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Question (14)

QN0036385

A 10 Ω resistor is connected to a 5 V source. The current through it is:

(A) 0.2 A
(B) 0.5 A
(C) 2 A
(D) 50 A

Correct Answer: B

Explanation:

I = V/R = 5/10 = 0.5 A.

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Question (15)

QN0036386

If the resistance of a conductor is doubled while the potential difference remains constant, the current becomes:

(A) Double
(B) Half
(C) Four times
(D) Unchanged

Correct Answer: B

Explanation:

I = V/R, so doubling resistance makes current half.

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Question (16)

QN0036387

A resistor carries 3 A current at 12 V. If the voltage is increased to 24 V and temperature remains constant, the new current will be:

(A) 1.5 A
(B) 3 A
(C) 6 A
(D) 9 A

Correct Answer: C

Explanation:

R = 12/3 = 4 Ω. New current = 24/4 = 6 A.

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Question (17)

QN0036388

A 220 V supply is connected to a bulb having resistance 1100 Ω. The current drawn is:

(A) 0.02 A
(B) 0.2 A
(C) 2 A
(D) 20 A

Correct Answer: B

Explanation:

I = V/R = 220/1100 = 0.2 A.

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Question (18)

QN0036389

A conductor has a resistance of 8 Ω. If 2 A current flows through it, its potential difference is:

(A) 4 V
(B) 10 V
(C) 16 V
(D) 32 V

Correct Answer: C

Explanation:

V = IR = 2 × 8 = 16 V.

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Question (19)

QN0036390

Which device is used to change the resistance in an electric circuit without changing the source voltage?

(A) Voltmeter
(B) Ammeter
(C) Rheostat
(D) Cell

Correct Answer: C

Explanation:

A rheostat is a variable resistance used to regulate current.

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Question (20)

QN0036391

The resistance of a uniform wire is directly proportional to its:

(A) Area of cross-section
(B) Length
(C) Reciprocal of length
(D) Diameter only

Correct Answer: B

Explanation:

Resistance is directly proportional to the length of the wire.

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Question (11)

A 12 V battery moves 3 C of charge between two points. The work done is:

Explanation:

Link:

Question (12)

According to Ohm’s law, at constant temperature, the potential difference across a conductor is:

Explanation:

Link:

Question (13)

A resistor has a potential difference of 20 V across it and carries 4 A current. Its resistance is:

Explanation:

Link:

Question (14)

A 10 Ω resistor is connected to a 5 V source. The current through it is:

Explanation:

Link:

Question (15)

If the resistance of a conductor is doubled while the potential difference remains constant, the current becomes:

Explanation:

Link:

Question (16)

A resistor carries 3 A current at 12 V. If the voltage is increased to 24 V and temperature remains constant, the new current will be:

Explanation:

Link:

Question (17)

A 220 V supply is connected to a bulb having resistance 1100 Ω. The current drawn is:

Explanation:

Link:

Question (18)

A conductor has a resistance of 8 Ω. If 2 A current flows through it, its potential difference is:

Explanation:

Link:

Question (19)

Which device is used to change the resistance in an electric circuit without changing the source voltage?

Explanation:

Link:

Question (20)

The resistance of a uniform wire is directly proportional to its:

Explanation:

Link:

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