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Question (21)

QN001971

A ball thrown vertically upward eventually comes back to the ground due to —

(A) Friction only
(B) Magnetic force
(C) Muscular force
(D) Gravitational force

Correct Answer: D

Explanation:

Gravity pulls the ball downward.

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Question (22)

QN001972

While a ball moves upward after being thrown vertically, its speed decreases because —

(A) Gravity acts downward
(B) Gravity acts upward
(C) No force acts on it
(D) Air pushes it upward

Correct Answer: A

Explanation:

Gravity opposes upward motion.

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Question (23)

QN001973

Which force is always attractive?

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

Correct Answer: D

Explanation:

Gravity always attracts objects.

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Question (24)

QN001974

The force with which Earth pulls an object towards itself is called —

(A) Mass
(B) Weight
(C) Density
(D) Pressure

Correct Answer: B

Explanation:

Weight is the gravitational pull of Earth.

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Question (25)

QN001975

The SI unit of weight is —

(A) Kilogram
(B) Gram
(C) Newton
(D) Metre

Correct Answer: C

Explanation:

Weight is a force, so its SI unit is newton.

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Question (26)

QN001976

A spring stretches more when a heavier object is hung on it. This shows that —

(A) Heavier objects have more weight
(B) Spring loses elasticity
(C) Gravity disappears
(D) Mass becomes zero

Correct Answer: A

Explanation:

Greater weight stretches the spring more.

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Question (27)

QN001977

A spring balance has markings from 0 N to 10 N. There are 5 equal small divisions between 1 N and 2 N. What is the value of one small division?

(A) 0.1 N
(B) 0.2 N
(C) 0.5 N
(D) 1 N

Correct Answer: B

Explanation:

1 N ÷ 5 = 0.2 N.

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Question (28)

QN001978

An object has mass 1 kg on Earth and on the Moon. Which statement is correct?

(A) Both mass and weight remain same
(B) Mass changes but weight remains same
(C) Mass remains same but weight changes
(D) Both mass and weight become zero

Correct Answer: C

Explanation:

Mass remains constant while weight changes.

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Question (29)

QN001979

A bottle pushed into water bounces upward because water applies —

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

Correct Answer: C

Explanation:

Water exerts an upward buoyant force.

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Question (30)

QN001980

An object floats in water when —

(A) Gravitational force is greater than buoyant force
(B) Buoyant force equals gravitational force
(C) Friction becomes zero
(D) Weight becomes zero

Correct Answer: B

Explanation:

Floating occurs when buoyant force balances weight.

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Question (21)

A ball thrown vertically upward eventually comes back to the ground due to —

Explanation:

Link:

Question (22)

While a ball moves upward after being thrown vertically, its speed decreases because —

Explanation:

Link:

Question (23)

Which force is always attractive?

Explanation:

Link:

Question (24)

The force with which Earth pulls an object towards itself is called —

Explanation:

Link:

Question (25)

The SI unit of weight is —

Explanation:

Link:

Question (26)

A spring stretches more when a heavier object is hung on it. This shows that —

Explanation:

Link:

Question (27)

A spring balance has markings from 0 N to 10 N. There are 5 equal small divisions between 1 N and 2 N. What is the value of one small division?

Explanation:

Link:

Question (28)

An object has mass 1 kg on Earth and on the Moon. Which statement is correct?

Explanation:

Link:

Question (29)

A bottle pushed into water bounces upward because water applies —

Explanation:

Link:

Question (30)

An object floats in water when —

Explanation:

Link:

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