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Question (21)

QN002131

Which quantity acts opposite to the weight of an object in water?

(A) Friction
(B) Magnetism
(C) Upthrust
(D) Tension

Correct Answer: C

Explanation:

Upthrust opposes weight in liquids.

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Question (22)

QN002132

A balloon filled with air floats on water because —

(A) Air has zero mass
(B) Its average density is low
(C) Gravity is absent
(D) Water pushes downward

Correct Answer: B

Explanation:

Lower density helps floating.

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Question (23)

QN002133

A block weighs 15 N in air and experiences 10 N upthrust in water. What happens?

(A) It floats upward completely
(B) It remains suspended only
(C) It sinks because weight is greater
(D) It becomes weightless

Correct Answer: C

Explanation:

Since 15 N is greater than 10 N, the block sinks.

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Question (24)

QN002134

A cork is pushed deep into water and released. It rises because —

(A) Upthrust exceeds its weight
(B) Gravity becomes zero
(C) Water pressure vanishes
(D) Cork attracts water molecules

Correct Answer: A

Explanation:

Greater upthrust pushes the cork upward.

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Question (25)

QN002135

Which statement correctly explains floating of ice on water?

(A) Ice has greater density than water
(B) Ice has lower density than water
(C) Water loses gravity near ice
(D) Ice has no weight

Correct Answer: B

Explanation:

Ice is less dense than water.

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Question (26)

QN002136

A metal ship floats even though metal is denser than water because —

(A) Ship shape increases displaced water and upthrust
(B) Gravity does not act on ships
(C) Sea water has no weight
(D) Metal becomes hollow naturally

Correct Answer: A

Explanation:

The hollow structure creates sufficient buoyant force.

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Question (27)

QN002137

A body experiences 20 N weight and 25 N upthrust in a liquid. The body will —

(A) Sink
(B) Float upward
(C) Stay at bottom
(D) Lose mass

Correct Answer: B

Explanation:

Upthrust is greater than weight.

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Question (28)

QN002138

Which of the following does NOT affect floating and sinking?

(A) Density
(B) Shape
(C) Upthrust
(D) Colour of object

Correct Answer: D

Explanation:

Colour has no effect on floating.

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Question (29)

QN002139

A swimmer floats more easily in seawater than in river water because seawater —

(A) Has greater upthrust due to higher density
(B) Removes gravity
(C) Has lower pressure
(D) Has no dissolved salts

Correct Answer: A

Explanation:

Denser seawater provides more upthrust.

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Question (30)

QN002140

Which statement best explains floating and sinking in liquids?

(A) Only heavy objects sink
(B) Only light objects float
(C) Floating depends on balance between weight and upthrust
(D) All metals sink in all liquids

Correct Answer: C

Explanation:

Floating and sinking depend on weight and upthrust balance.

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Question (21)

Which quantity acts opposite to the weight of an object in water?

Explanation:

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Question (22)

A balloon filled with air floats on water because —

Explanation:

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Question (23)

A block weighs 15 N in air and experiences 10 N upthrust in water. What happens?

Explanation:

Link:

Question (24)

A cork is pushed deep into water and released. It rises because —

Explanation:

Link:

Question (25)

Which statement correctly explains floating of ice on water?

Explanation:

Link:

Question (26)

A metal ship floats even though metal is denser than water because —

Explanation:

Link:

Question (27)

A body experiences 20 N weight and 25 N upthrust in a liquid. The body will —

Explanation:

Link:

Question (28)

Which of the following does NOT affect floating and sinking?

Explanation:

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Question (29)

A swimmer floats more easily in seawater than in river water because seawater —

Explanation:

Link:

Question (30)

Which statement best explains floating and sinking in liquids?

Explanation:

Link:

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