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Question (11)

QN0028926

An object weighs 24 N in air and experiences an upthrust of 30 N in water. What will happen?

(A) It sinks immediately
(B) It floats upward
(C) It stays at bottom
(D) It loses mass

Correct Answer: B

Explanation:

Upthrust exceeds weight.

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Question (12)

QN0028927

Which statement correctly explains friction?

(A) It always increases motion
(B) It opposes relative motion between surfaces
(C) It acts only in liquids
(D) It is a non-contact force

Correct Answer: B

Explanation:

Friction acts opposite to motion.

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Question (13)

QN0028928

A trolley is pushed with 70 N force northward and 20 N southward. What is the resultant force?

(A) 90 N north
(B) 50 N north
(C) 50 N south
(D) 90 N south

Correct Answer: B

Explanation:

Resultant force = 70 N − 20 N = 50 N north.

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Question (14)

QN0028929

A magnet attracts an iron clip placed nearby. Which property of force is demonstrated?

(A) Force requires contact
(B) Force can act from a distance
(C) Force always changes shape
(D) Force reduces gravity

Correct Answer: B

Explanation:

Magnetic force acts without touching.

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Question (15)

QN0028930

A rubber ball changes shape when squeezed. Which effect of force is observed?

(A) Change in colour
(B) Change in motion only
(C) Change in shape
(D) Change in mass

Correct Answer: C

Explanation:

Force can deform objects.

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Question (16)

QN0028931

Why do heavy trucks have grooves on their tyres?

(A) To reduce gravity
(B) To increase friction with road
(C) To reduce weight
(D) To create magnetic force

Correct Answer: B

Explanation:

Grooves increase grip by increasing friction.

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Question (17)

QN0028932

A block weighs 45 N on Earth. At a place where gravity is weaker, its weight becomes 30 N. Which quantity remains unchanged?

(A) Weight
(B) Gravitational pull
(C) Mass
(D) Upthrust

Correct Answer: C

Explanation:

Mass remains constant everywhere.

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Question (18)

QN0028933

Which object is most likely to float in water?

(A) Iron cube
(B) Steel nail
(C) Cork piece
(D) Glass marble

Correct Answer: C

Explanation:

Cork has lower density than water.

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Question (19)

QN0028934

A toy car moving on a rough floor stops sooner than on a smooth floor because rough surfaces produce —

(A) Less friction
(B) More friction
(C) More gravity
(D) Less mass

Correct Answer: B

Explanation:

Greater friction slows the toy car faster.

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Question (20)

QN0028935

A boat floats on water because —

(A) Its weight becomes zero
(B) Water exerts sufficient upthrust on it
(C) Gravity stops acting on it
(D) Boats are made only of light materials

Correct Answer: B

Explanation:

Floating occurs when upthrust balances weight.

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Question (11)

An object weighs 24 N in air and experiences an upthrust of 30 N in water. What will happen?

Explanation:

Link:

Question (12)

Which statement correctly explains friction?

Explanation:

Link:

Question (13)

A trolley is pushed with 70 N force northward and 20 N southward. What is the resultant force?

Explanation:

Link:

Question (14)

A magnet attracts an iron clip placed nearby. Which property of force is demonstrated?

Explanation:

Link:

Question (15)

A rubber ball changes shape when squeezed. Which effect of force is observed?

Explanation:

Link:

Question (16)

Why do heavy trucks have grooves on their tyres?

Explanation:

Link:

Question (17)

A block weighs 45 N on Earth. At a place where gravity is weaker, its weight becomes 30 N. Which quantity remains unchanged?

Explanation:

Link:

Question (18)

Which object is most likely to float in water?

Explanation:

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Question (19)

A toy car moving on a rough floor stops sooner than on a smooth floor because rough surfaces produce —

Explanation:

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Question (20)

A boat floats on water because —

Explanation:

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