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Question (31)

QN0026257

The SI unit of force is:

(A) Joule
(B) Pascal
(C) Newton
(D) Dyne

Correct Answer: C

Explanation:

SI unit of force is Newton.

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Question (32)

QN0026258

A passenger falls forward when a moving bus stops suddenly because of:

(A) Inertia of rest
(B) Inertia of motion
(C) Friction
(D) Gravitation

Correct Answer: B

Explanation:

Body tends to continue moving due to inertia of motion.

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Question (33)

QN0026259

A force of 55 N acts leftward while another force of 25 N acts rightward. Resultant force equals:

(A) 80 N leftward
(B) 30 N leftward
(C) 30 N rightward
(D) 80 N rightward

Correct Answer: B

Explanation:

Net force = 55 − 25 = 30 N leftward.

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Question (34)

QN0026260

Which of the following reduces friction?

(A) Roughening surfaces
(B) Spikes in shoes
(C) Ball bearings
(D) Sand coating

Correct Answer: C

Explanation:

Ball bearings reduce friction by converting sliding friction into rolling friction.

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Question (35)

QN0026261

Newton’s Second Law mathematically is expressed as:

(A) F = ma
(B) P = mv
(C) V = u + at
(D) W = mg

Correct Answer: A

Explanation:

Force equals mass multiplied by acceleration.

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Question (36)

QN0026262

A rocket rises upward because gases are expelled:

(A) Upward
(B) Sideways
(C) Downward
(D) Randomly

Correct Answer: C

Explanation:

Downward action force creates upward reaction force.

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Question (37)

QN0026263

A force of 500 N eastward and 350 N westward act together. Net force equals:

(A) 850 N eastward
(B) 150 N eastward
(C) 150 N westward
(D) 850 N westward

Correct Answer: B

Explanation:

Net force = 500 − 350 = 150 N eastward.

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Question (38)

QN0026264

Which property causes objects to resist change in motion?

(A) Density
(B) Pressure
(C) Inertia
(D) Buoyancy

Correct Answer: C

Explanation:

Inertia resists change in state of motion.

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Question (39)

QN0026265

A scooter moving uniformly on a straight road experiences:

(A) Unbalanced force
(B) Balanced forces
(C) Infinite acceleration
(D) No friction

Correct Answer: B

Explanation:

Uniform motion means resultant force is zero.

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Question (40)

QN0026266

Friction converts mechanical energy mainly into:

(A) Light energy
(B) Electrical energy
(C) Heat energy
(D) Sound energy only

Correct Answer: C

Explanation:

Friction produces heat.

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Question (31)

The SI unit of force is:

Explanation:

Link:

Question (32)

A passenger falls forward when a moving bus stops suddenly because of:

Explanation:

Link:

Question (33)

A force of 55 N acts leftward while another force of 25 N acts rightward. Resultant force equals:

Explanation:

Link:

Question (34)

Which of the following reduces friction?

Explanation:

Link:

Question (35)

Newton’s Second Law mathematically is expressed as:

Explanation:

Link:

Question (36)

A rocket rises upward because gases are expelled:

Explanation:

Link:

Question (37)

A force of 500 N eastward and 350 N westward act together. Net force equals:

Explanation:

Link:

Question (38)

Which property causes objects to resist change in motion?

Explanation:

Link:

Question (39)

A scooter moving uniformly on a straight road experiences:

Explanation:

Link:

Question (40)

Friction converts mechanical energy mainly into:

Explanation:

Link:

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