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Question (31)

QN0036452

In Fleming's left-hand rule, the thumb represents the direction of:

(A) Magnetic field
(B) Current
(C) Force
(D) Resistance

Correct Answer: C

Explanation:

The thumb represents the direction of force on the conductor.

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Question (32)

QN0036453

If the direction of current through a conductor is reversed while the magnetic field remains unchanged, the force:

(A) Reverses direction
(B) Becomes zero
(C) Remains unchanged
(D) Doubles

Correct Answer: A

Explanation:

Reversing current reverses the direction of the magnetic force.

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Question (33)

QN0036454

If the magnetic field is reversed while the current remains unchanged, the force:

(A) Reverses direction
(B) Remains unchanged
(C) Becomes zero
(D) Becomes infinite

Correct Answer: A

Explanation:

Reversing the magnetic field reverses the direction of force.

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Question (34)

QN0036455

Which of the following devices works using the force on a current-carrying conductor in a magnetic field?

(A) Electric motor
(B) Electric heater only
(C) Fuse only
(D) Thermometer

Correct Answer: A

Explanation:

An electric motor works using the force on a current-carrying conductor in a magnetic field.

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Question (35)

QN0036456

When an electron enters a magnetic field at right angles, the magnetic force acts:

(A) Along the magnetic field
(B) Along the electron's direction of motion
(C) Perpendicular to both the field and motion
(D) Opposite to the field only

Correct Answer: C

Explanation:

The magnetic force is perpendicular to both the magnetic field and the electron's motion.

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Question (36)

QN0036457

Why are electrical appliances in domestic circuits connected in parallel?

(A) Each appliance receives the same potential difference
(B) Current becomes zero
(C) Resistance becomes infinite
(D) Appliances cannot work independently

Correct Answer: A

Explanation:

Parallel connection ensures that each appliance gets the same potential difference and can operate independently.

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Question (37)

QN0036458

What is the potential difference between the live and neutral wires in a domestic circuit as given in the chapter?

(A) 12 V
(B) 110 V
(C) 220 V
(D) 440 V

Correct Answer: C

Explanation:

The potential difference between live and neutral wires is 220 V.

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Question (38)

QN0036459

What is the colour of the live wire in the domestic circuit described in the chapter?

(A) Green
(B) Black
(C) Red
(D) White

Correct Answer: C

Explanation:

The live wire is represented by red colour.

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Question (39)

QN0036460

What is the colour of the neutral wire in the domestic circuit described in the chapter?

(A) Red
(B) Black
(C) Green
(D) Yellow

Correct Answer: B

Explanation:

The neutral wire is represented by black colour.

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Question (40)

QN0036461

What is the colour of the earth wire in the domestic circuit described in the chapter?

(A) Red
(B) Black
(C) Green
(D) Blue

Correct Answer: C

Explanation:

The earth wire is represented by green colour.

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Question (31)

In Fleming's left-hand rule, the thumb represents the direction of:

Explanation:

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Question (32)

If the direction of current through a conductor is reversed while the magnetic field remains unchanged, the force:

Explanation:

Link:

Question (33)

If the magnetic field is reversed while the current remains unchanged, the force:

Explanation:

Link:

Question (34)

Which of the following devices works using the force on a current-carrying conductor in a magnetic field?

Explanation:

Link:

Question (35)

When an electron enters a magnetic field at right angles, the magnetic force acts:

Explanation:

Link:

Question (36)

Why are electrical appliances in domestic circuits connected in parallel?

Explanation:

Link:

Question (37)

What is the potential difference between the live and neutral wires in a domestic circuit as given in the chapter?

Explanation:

Link:

Question (38)

What is the colour of the live wire in the domestic circuit described in the chapter?

Explanation:

Link:

Question (39)

What is the colour of the neutral wire in the domestic circuit described in the chapter?

Explanation:

Link:

Question (40)

What is the colour of the earth wire in the domestic circuit described in the chapter?

Explanation:

Link:

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