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Question (11)

QN001961

Friction always acts —

(A) In the direction of motion
(B) Opposite to the direction of motion
(C) Upward only
(D) Downward only

Correct Answer: B

Explanation:

Friction opposes motion.

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Question (12)

QN001962

A student slides the same book on glass, wood, and sand. On which surface will the book stop first?

(A) Glass
(B) Polished wood
(C) Sand
(D) All at the same distance

Correct Answer: C

Explanation:

Friction is maximum on sand.

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Question (13)

QN001963

Why is it difficult to pedal a bicycle on a rough road?

(A) Gravity becomes stronger
(B) Friction between tyres and road increases
(C) Air pressure decreases
(D) Weight of bicycle increases

Correct Answer: B

Explanation:

Rough roads increase friction.

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Question (14)

QN001964

Which of the following is a contact force?

(A) Magnetic force
(B) Gravitational force
(C) Electrostatic force
(D) Muscular force

Correct Answer: D

Explanation:

Muscular force requires contact.

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Question (15)

QN001965

Which activity mainly uses muscular force?

(A) Compass needle pointing north
(B) Apple falling from a tree
(C) Lifting a school bag
(D) Charged scale attracting paper bits

Correct Answer: C

Explanation:

Lifting involves muscular force.

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Question (16)

QN001966

A magnet attracts an iron nail kept nearby without touching it. This shows that magnetic force is —

(A) A contact force
(B) A balanced force
(C) A non-contact force
(D) A muscular force

Correct Answer: C

Explanation:

Magnetic force acts without contact.

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Question (17)

QN001967

Two ring magnets are arranged with like poles facing each other. What will happen?

(A) They attract strongly
(B) They repel each other
(C) Both lose magnetism
(D) No force acts between them

Correct Answer: B

Explanation:

Like poles repel each other.

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Question (18)

QN001968

A rubbed plastic scale attracts tiny paper pieces because of —

(A) Muscular force
(B) Frictional force
(C) Electrostatic force
(D) Gravitational force

Correct Answer: C

Explanation:

Static charges produce electrostatic force.

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Question (19)

QN001969

Two balloons rubbed with woollen cloth move away from each other because —

(A) Both balloons become heavy
(B) Both balloons get similar charges
(C) Air pushes them apart
(D) Gravity acts differently on them

Correct Answer: B

Explanation:

Similar charges repel each other.

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Question (20)

QN001970

Which statement about electric charges is correct?

(A) Like charges attract each other
(B) Unlike charges repel each other
(C) Like charges repel each other
(D) Charges act only on contact

Correct Answer: C

Explanation:

Similar charges repel each other.

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Question (11)

Friction always acts —

Explanation:

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Question (12)

A student slides the same book on glass, wood, and sand. On which surface will the book stop first?

Explanation:

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Question (13)

Why is it difficult to pedal a bicycle on a rough road?

Explanation:

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Question (14)

Which of the following is a contact force?

Explanation:

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Question (15)

Which activity mainly uses muscular force?

Explanation:

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Question (16)

A magnet attracts an iron nail kept nearby without touching it. This shows that magnetic force is —

Explanation:

Link:

Question (17)

Two ring magnets are arranged with like poles facing each other. What will happen?

Explanation:

Link:

Question (18)

A rubbed plastic scale attracts tiny paper pieces because of —

Explanation:

Link:

Question (19)

Two balloons rubbed with woollen cloth move away from each other because —

Explanation:

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Question (20)

Which statement about electric charges is correct?

Explanation:

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