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Question (41)

QN0036412

A 2 Ω resistor carries a current of 3 A for 10 s. The heat produced is:

(A) 18 J
(B) 60 J
(C) 90 J
(D) 180 J

Correct Answer: D

Explanation:

H = I²Rt = 3² × 2 × 10 = 180 J.

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Question (42)

QN0036413

If the current through a resistor is doubled while resistance and time remain constant, the heat produced becomes:

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

Correct Answer: C

Explanation:

H = I²Rt, so doubling current makes heat four times.

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Question (43)

QN0036414

A resistor of 5 Ω carries 2 A current for 20 s. The heat generated is:

(A) 100 J
(B) 200 J
(C) 400 J
(D) 800 J

Correct Answer: C

Explanation:

H = I²Rt = 2² × 5 × 20 = 400 J.

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Question (44)

QN0036415

An appliance operates at 220 V and draws 2 A current. Its electric power is:

(A) 110 W
(B) 220 W
(C) 440 W
(D) 880 W

Correct Answer: C

Explanation:

P = VI = 220 × 2 = 440 W.

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Question (45)

QN0036416

A 100 W bulb operates for 5 hours. The electrical energy consumed is:

(A) 0.02 kWh
(B) 0.5 kWh
(C) 5 kWh
(D) 500 kWh

Correct Answer: B

Explanation:

Energy = 0.1 kW × 5 h = 0.5 kWh.

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Question (46)

QN0036417

An electric heater has a resistance of 44 Ω and draws 5 A current. Its power is:

(A) 110 W
(B) 220 W
(C) 550 W
(D) 1100 W

Correct Answer: D

Explanation:

P = I²R = 5² × 44 = 1100 W.

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Question (47)

QN0036418

A 220 V, 100 W bulb is operated at its rated voltage. Its current is approximately:

(A) 0.045 A
(B) 0.45 A
(C) 2.2 A
(D) 22 A

Correct Answer: B

Explanation:

I = P/V = 100/220 ≈ 0.45 A.

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Question (48)

QN0036419

A refrigerator rated 400 W operates for 8 hours per day for 30 days. The energy consumed is:

(A) 9.6 kWh
(B) 32 kWh
(C) 96 kWh
(D) 960 kWh

Correct Answer: C

Explanation:

Energy = 0.4 × 8 × 30 = 96 kWh.

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Question (49)

QN0036420

A 1 kW heater is operated for 3 hours. The electrical energy consumed is:

(A) 0.3 kWh
(B) 1 kWh
(C) 3 kWh
(D) 3000 kWh

Correct Answer: C

Explanation:

Energy = P × t = 1 × 3 = 3 kWh.

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Question (50)

QN0036421

Two appliances consume powers of 250 W and 1200 W. If the first operates for 1 hour and the second for 10 minutes, which consumes more electrical energy?

(A) 250 W appliance
(B) 1200 W appliance
(C) Both consume equal energy
(D) Cannot be determined

Correct Answer: A

Explanation:

First appliance uses 250 Wh. Second uses 1200 × 10/60 = 200 Wh. Therefore, the 250 W appliance consumes more energy.

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Question (41)

A 2 Ω resistor carries a current of 3 A for 10 s. The heat produced is:

Explanation:

Link:

Question (42)

If the current through a resistor is doubled while resistance and time remain constant, the heat produced becomes:

Explanation:

Link:

Question (43)

A resistor of 5 Ω carries 2 A current for 20 s. The heat generated is:

Explanation:

Link:

Question (44)

An appliance operates at 220 V and draws 2 A current. Its electric power is:

Explanation:

Link:

Question (45)

A 100 W bulb operates for 5 hours. The electrical energy consumed is:

Explanation:

Link:

Question (46)

An electric heater has a resistance of 44 Ω and draws 5 A current. Its power is:

Explanation:

Link:

Question (47)

A 220 V, 100 W bulb is operated at its rated voltage. Its current is approximately:

Explanation:

Link:

Question (48)

A refrigerator rated 400 W operates for 8 hours per day for 30 days. The energy consumed is:

Explanation:

Link:

Question (49)

A 1 kW heater is operated for 3 hours. The electrical energy consumed is:

Explanation:

Link:

Question (50)

Two appliances consume powers of 250 W and 1200 W. If the first operates for 1 hour and the second for 10 minutes, which consumes more electrical energy?

Explanation:

Link:

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