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Question (11)

QN003511

Why are ball bearings used in machines?

(A) To increase friction
(B) To reduce friction
(C) To increase weight
(D) To stop motion

Correct Answer: B

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Question (12)

QN003512

A bicycle slows down after pedalling stops mainly due to:

(A) Muscular force
(B) Frictional force
(C) Magnetic force
(D) Buoyant force

Correct Answer: B

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Question (13)

QN003513

Which type of friction acts when a box slides on a floor?

(A) Rolling friction
(B) Fluid friction
(C) Sliding friction
(D) Magnetic friction

Correct Answer: C

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Question (14)

QN003514

Lubricants reduce friction by:

(A) Increasing roughness
(B) Filling irregularities between surfaces
(C) Increasing pressure
(D) Increasing mass

Correct Answer: B

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Question (15)

QN003515

A car tyre with grooves helps to:

(A) Increase friction with road
(B) Decrease engine power
(C) Reduce air pressure
(D) Increase weight

Correct Answer: A

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Question (16)

QN003516

Which force opposes the motion of objects through air?

(A) Magnetic force
(B) Electrostatic force
(C) Air resistance
(D) Muscular force

Correct Answer: C

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Question (17)

QN003517

A force of 90 N pulls a cart forward while friction of 35 N opposes it. Resultant force is:

(A) 125 N forward
(B) 55 N forward
(C) 55 N backward
(D) 125 N backward

Correct Answer: B

Explanation:

90 − 35 = 55 N forward.

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Question (18)

QN003518

Friction can produce:

(A) Cooling only
(B) Heat only
(C) Heat and wear
(D) Light only

Correct Answer: C

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Question (19)

QN003519

Which activity requires friction?

(A) Writing with chalk
(B) Skating on ice
(C) Sliding on oil
(D) Floating in water

Correct Answer: A

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Question (20)

QN003520

Static friction acts:

(A) Only after motion starts
(B) Before motion begins
(C) Only in liquids
(D) Only during rolling

Correct Answer: B

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Question (11)

Why are ball bearings used in machines?

Explanation:

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Question (12)

A bicycle slows down after pedalling stops mainly due to:

Explanation:

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Question (13)

Which type of friction acts when a box slides on a floor?

Explanation:

Link:

Question (14)

Lubricants reduce friction by:

Explanation:

Link:

Question (15)

A car tyre with grooves helps to:

Explanation:

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Question (16)

Which force opposes the motion of objects through air?

Explanation:

Link:

Question (17)

A force of 90 N pulls a cart forward while friction of 35 N opposes it. Resultant force is:

Explanation:

Link:

Question (18)

Friction can produce:

Explanation:

Link:

Question (19)

Which activity requires friction?

Explanation:

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Question (20)

Static friction acts:

Explanation:

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