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Question (11)

QN002121

A hollow plastic ball floats while a solid iron ball sinks because —

(A) Plastic has no mass
(B) Shape and density affect floating
(C) Iron loses gravity
(D) Water attracts plastic more

Correct Answer: B

Explanation:

Density and shape determine floating.

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Question (12)

QN002122

Which factor mainly determines whether an object floats or sinks?

(A) Colour
(B) Smell
(C) Relation between weight and upthrust
(D) Temperature only

Correct Answer: C

Explanation:

Floating depends on balance of forces.

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Question (13)

QN002123

A boat floats on river water because the upthrust acting on it is —

(A) Zero
(B) Less than its weight
(C) Equal to its weight
(D) Opposite to gravity only partially

Correct Answer: C

Explanation:

Floating occurs when upthrust balances weight.

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Question (14)

QN002124

Which object experiences upthrust?

(A) Only floating objects
(B) Only sinking objects
(C) Any object placed in a liquid
(D) Only iron objects

Correct Answer: C

Explanation:

All immersed objects experience upthrust.

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Question (15)

QN002125

An empty bottle floats on water mainly because —

(A) Air inside reduces average density
(B) Gravity stops acting
(C) Water becomes lighter
(D) Plastic becomes magnetic

Correct Answer: A

Explanation:

Air lowers the average density of the bottle.

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Question (16)

QN002126

A submarine sinks when —

(A) Upthrust becomes greater than weight
(B) Weight becomes greater than upthrust
(C) Gravity disappears
(D) Water pressure becomes zero

Correct Answer: B

Explanation:

Sinking occurs when weight exceeds upthrust.

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Question (17)

QN002127

Which statement about upthrust is correct?

(A) It acts downward
(B) It is exerted only by solids
(C) It acts upward on immersed objects
(D) It increases weight permanently

Correct Answer: C

Explanation:

Upthrust always acts upward.

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Question (18)

QN002128

A piece of wax floats on water. Which force balances its weight?

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

Correct Answer: C

Explanation:

Upthrust balances the weight of floating wax.

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Question (19)

QN002129

Which of the following will sink fastest in water?

(A) Wooden stick
(B) Sponge ball
(C) Iron cube
(D) Cork piece

Correct Answer: C

Explanation:

Iron has much greater density than water.

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Question (20)

QN002130

A steel bowl floats on water while a steel coin sinks because —

(A) Bowl has less mass
(B) Bowl traps air and displaces more water
(C) Coin has no gravity
(D) Water repels bowls

Correct Answer: B

Explanation:

The bowl’s shape increases buoyant force.

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Question (11)

A hollow plastic ball floats while a solid iron ball sinks because —

Explanation:

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Question (12)

Which factor mainly determines whether an object floats or sinks?

Explanation:

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Question (13)

A boat floats on river water because the upthrust acting on it is —

Explanation:

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Question (14)

Which object experiences upthrust?

Explanation:

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Question (15)

An empty bottle floats on water mainly because —

Explanation:

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Question (16)

A submarine sinks when —

Explanation:

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Question (17)

Which statement about upthrust is correct?

Explanation:

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Question (18)

A piece of wax floats on water. Which force balances its weight?

Explanation:

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Question (19)

Which of the following will sink fastest in water?

Explanation:

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Question (20)

A steel bowl floats on water while a steel coin sinks because —

Explanation:

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