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Question (41)

QN0036462

What is the main purpose of an earth wire?

(A) To increase voltage
(B) To provide a low-resistance path for leakage current and protect against electric shock
(C) To increase appliance power
(D) To reduce the supply frequency

Correct Answer: B

Explanation:

The earth wire provides a low-resistance path for leakage current and helps protect against severe electric shock.

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Question (42)

QN0036463

Which appliance is especially likely to need an earth connection because it has a metallic body?

(A) Metal-bodied electrical appliance
(B) Plastic ruler
(C) Wooden table
(D) Glass bottle

Correct Answer: A

Explanation:

Appliances with metallic bodies are connected to earth for safety.

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Question (43)

QN0036464

What is the main purpose of a fuse in a domestic circuit?

(A) To increase current
(B) To protect the circuit from overloading and short circuit
(C) To increase voltage
(D) To store electrical energy

Correct Answer: B

Explanation:

A fuse protects the circuit by breaking the circuit when excessive current flows.

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Question (44)

QN0036465

What happens to the current during a short circuit?

(A) It decreases sharply
(B) It increases abruptly
(C) It becomes zero immediately
(D) It remains unchanged

Correct Answer: B

Explanation:

A short circuit causes an abrupt increase in current.

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Question (45)

QN0036466

Why does a fuse wire melt when excessive current flows?

(A) Due to Joule heating
(B) Due to magnetic cooling
(C) Due to low voltage
(D) Due to reduced temperature

Correct Answer: A

Explanation:

Excessive current produces heat in the fuse wire, causing it to melt.

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Question (46)

QN0036467

A 2 kW appliance is connected to a 220 V supply. What current does it draw approximately?

(A) 4.55 A
(B) 9.09 A
(C) 22 A
(D) 44 A

Correct Answer: B

Explanation:

I = P/V = 2000/220 ≈ 9.09 A.

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Question (47)

QN0036468

A 2 kW oven is connected to a circuit protected by a 5 A fuse. What is most likely to happen?

(A) It will draw about 2 A
(B) It may cause overloading because it draws about 9.09 A
(C) It will draw no current
(D) The voltage becomes zero

Correct Answer: B

Explanation:

I = 2000/220 ≈ 9.09 A, which exceeds the 5 A rating and may cause overloading.

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Question (48)

QN0036469

If the current through a conductor is increased from 2 A to 4 A while other conditions remain the same, the magnetic field:

(A) Becomes half
(B) Becomes twice
(C) Becomes four times
(D) Remains unchanged

Correct Answer: B

Explanation:

Magnetic field increases with current, so doubling current doubles the field.

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Question (49)

QN0036470

A compass is moved farther away from a current-carrying straight wire. What happens to the magnetic effect observed by the compass?

(A) It increases
(B) It decreases
(C) It becomes infinite
(D) It remains unchanged

Correct Answer: B

Explanation:

The magnetic field decreases as the distance from the current-carrying wire increases.

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Question (50)

QN0036471

If both the current direction and the magnetic field direction acting on a conductor are reversed simultaneously, the direction of force on the conductor:

(A) Reverses
(B) Remains unchanged
(C) Becomes zero
(D) Becomes random

Correct Answer: B

Explanation:

Reversing both current and magnetic field simultaneously leaves the direction of force unchanged.

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Question (41)

What is the main purpose of an earth wire?

Explanation:

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Question (42)

Which appliance is especially likely to need an earth connection because it has a metallic body?

Explanation:

Link:

Question (43)

What is the main purpose of a fuse in a domestic circuit?

Explanation:

Link:

Question (44)

What happens to the current during a short circuit?

Explanation:

Link:

Question (45)

Why does a fuse wire melt when excessive current flows?

Explanation:

Link:

Question (46)

A 2 kW appliance is connected to a 220 V supply. What current does it draw approximately?

Explanation:

Link:

Question (47)

A 2 kW oven is connected to a circuit protected by a 5 A fuse. What is most likely to happen?

Explanation:

Link:

Question (48)

If the current through a conductor is increased from 2 A to 4 A while other conditions remain the same, the magnetic field:

Explanation:

Link:

Question (49)

A compass is moved farther away from a current-carrying straight wire. What happens to the magnetic effect observed by the compass?

Explanation:

Link:

Question (50)

If both the current direction and the magnetic field direction acting on a conductor are reversed simultaneously, the direction of force on the conductor:

Explanation:

Link:

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