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Question (21)

QN0026247

A body at rest remains at rest unless acted upon by:

(A) Balanced force
(B) External unbalanced force
(C) Friction only
(D) Internal force only

Correct Answer: B

Explanation:

An external unbalanced force is needed to change the state of rest.

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Question (22)

QN0026248

A force of 150 N acts northward and another force of 90 N southward acts on a body. Resultant force is:

(A) 240 N northward
(B) 60 N northward
(C) 60 N southward
(D) 240 N southward

Correct Answer: B

Explanation:

Net force = 150 − 90 = 60 N northward.

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Question (23)

QN0026249

Which surface provides maximum friction?

(A) Ice
(B) Polished marble
(C) Sandpaper
(D) Wet glass

Correct Answer: C

Explanation:

Rough surfaces like sandpaper provide maximum friction.

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Question (24)

QN0026250

Momentum depends upon:

(A) Mass only
(B) Velocity only
(C) Mass and velocity
(D) Density and force

Correct Answer: C

Explanation:

Momentum = mass × velocity.

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Question (25)

QN0026251

A swimmer pushes water backward and moves forward due to:

(A) Newton’s First Law
(B) Newton’s Second Law
(C) Newton’s Third Law
(D) Gravitation

Correct Answer: C

Explanation:

Action and reaction forces help the swimmer move forward.

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Question (26)

QN0026252

A force of 18 N eastward and 12 N westward act together. Resultant force is:

(A) 30 N eastward
(B) 6 N eastward
(C) 6 N westward
(D) 30 N westward

Correct Answer: B

Explanation:

Net force = 18 − 12 = 6 N eastward.

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Question (27)

QN0026253

Why are lubricants used in machines?

(A) To increase friction
(B) To reduce friction
(C) To increase mass
(D) To reduce inertia

Correct Answer: B

Explanation:

Lubricants reduce friction between moving parts.

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Question (28)

QN0026254

A moving cricket ball stops on grass mainly because:

(A) Balanced force acts
(B) Friction opposes motion
(C) Gravity disappears
(D) Mass becomes zero

Correct Answer: B

Explanation:

Friction slows and stops the moving ball.

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Question (29)

QN0026255

Which quantity has both magnitude and direction?

(A) Speed
(B) Distance
(C) Force
(D) Mass

Correct Answer: C

Explanation:

Force is a vector quantity.

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Question (30)

QN0026256

A force of 300 N forward and 100 N backward act on a body. Net force is:

(A) 400 N forward
(B) 200 N forward
(C) 200 N backward
(D) 400 N backward

Correct Answer: B

Explanation:

Resultant force = 300 − 100 = 200 N forward.

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Question (21)

A body at rest remains at rest unless acted upon by:

Explanation:

Link:

Question (22)

A force of 150 N acts northward and another force of 90 N southward acts on a body. Resultant force is:

Explanation:

Link:

Question (23)

Which surface provides maximum friction?

Explanation:

Link:

Question (24)

Momentum depends upon:

Explanation:

Link:

Question (25)

A swimmer pushes water backward and moves forward due to:

Explanation:

Link:

Question (26)

A force of 18 N eastward and 12 N westward act together. Resultant force is:

Explanation:

Link:

Question (27)

Why are lubricants used in machines?

Explanation:

Link:

Question (28)

A moving cricket ball stops on grass mainly because:

Explanation:

Link:

Question (29)

Which quantity has both magnitude and direction?

Explanation:

Link:

Question (30)

A force of 300 N forward and 100 N backward act on a body. Net force is:

Explanation:

Link:

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