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Question (11)

QN006192

A force of 80 N acts on a trolley moving 2.5 m in the direction of force. Work done is:

(A) 32 J
(B) 82.5 J
(C) 200 J
(D) 20 J

Correct Answer: C

Explanation:

W = 80 × 2.5 = 200 J

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Question (12)

QN006193

A crane lifts a load vertically upward using a force equal to its weight. If the load rises by 8 m and its weight is 500 N, the work done is:

(A) 62.5 J
(B) 4000 J
(C) 508 J
(D) 40 J

Correct Answer: B

Explanation:

W = 500 × 8 = 4000 J

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Question (13)

QN006194

A goalkeeper applies a force opposite to the motion of a football. The work done by the goalkeeper on the ball is:

(A) Positive
(B) Negative
(C) Zero
(D) Undefined

Correct Answer: B

Explanation:

Opposite force produces negative work

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Question (14)

QN006195

A force of 150 N acts opposite to displacement of 3 m. The work done is:

(A) 450 J
(B) –450 J
(C) 50 J
(D) –50 J

Correct Answer: B

Explanation:

W = –150 × 3 = –450 J

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Question (15)

QN006196

A porter carries a suitcase of weight 200 N through a horizontal distance of 20 m. Work done by the porter’s lifting force is:

(A) 4000 J
(B) 200 J
(C) Zero
(D) –4000 J

Correct Answer: C

Explanation:

Force is vertical while displacement is horizontal

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Question (16)

QN006197

Which statement is correct?

(A) Work always has direction
(B) Work can only be positive
(C) Work may be positive or negative
(D) Work is always zero

Correct Answer: C

Explanation:

Work can be positive, negative, or zero

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Question (17)

QN006198

A force-displacement graph forms a rectangle of height 12 N and width 5 m. The work done equals:

(A) 17 J
(B) 60 J
(C) 7 J
(D) 120 J

Correct Answer: B

Explanation:

Area under graph = 12 × 5 = 60 J

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Question (18)

QN006199

If the applied force becomes three times and displacement remains same, work done becomes:

(A) One-third
(B) Same
(C) Three times
(D) Nine times

Correct Answer: C

Explanation:

Work is directly proportional to force

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Question (19)

QN006200

If displacement becomes four times while force remains same, work done becomes:

(A) Four times
(B) Half
(C) Same
(D) Sixteen times

Correct Answer: A

Explanation:

Work is directly proportional to displacement

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Question (20)

QN006201

A student lifts three identical bags separately to the same height. Compared to lifting one bag, the total work done becomes:

(A) One-third
(B) Same
(C) Double
(D) Three times

Correct Answer: D

Explanation:

Total work increases three times

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Question (11)

A force of 80 N acts on a trolley moving 2.5 m in the direction of force. Work done is:

Explanation:

Link:

Question (12)

A crane lifts a load vertically upward using a force equal to its weight. If the load rises by 8 m and its weight is 500 N, the work done is:

Explanation:

Link:

Question (13)

A goalkeeper applies a force opposite to the motion of a football. The work done by the goalkeeper on the ball is:

Explanation:

Link:

Question (14)

A force of 150 N acts opposite to displacement of 3 m. The work done is:

Explanation:

Link:

Question (15)

A porter carries a suitcase of weight 200 N through a horizontal distance of 20 m. Work done by the porter’s lifting force is:

Explanation:

Link:

Question (16)

Which statement is correct?

Explanation:

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Question (17)

A force-displacement graph forms a rectangle of height 12 N and width 5 m. The work done equals:

Explanation:

Link:

Question (18)

If the applied force becomes three times and displacement remains same, work done becomes:

Explanation:

Link:

Question (19)

If displacement becomes four times while force remains same, work done becomes:

Explanation:

Link:

Question (20)

A student lifts three identical bags separately to the same height. Compared to lifting one bag, the total work done becomes:

Explanation:

Link:

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