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Question (41)

QN006222

A coolie walks 30 m carrying a load on his head. The upward force applied by him is 500 N. Work done by this upward force is:

(A) 15000 J
(B) 500 J
(C) Zero
(D) –15000 J

Correct Answer: C

Explanation:

Force and displacement are perpendicular

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Question (42)

QN006223

Which example represents positive work done?

(A) Brakes stopping a car
(B) Friction slowing a ball
(C) Lifting a suitcase upward
(D) Holding a bag stationary

Correct Answer: C

Explanation:

Force and displacement are in same direction

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Question (43)

QN006224

A force of 18 N does 90 J of work. The displacement produced is:

(A) 108 m
(B) 5 m
(C) 72 m
(D) 0.2 m

Correct Answer: B

Explanation:

s = 90 ÷ 18 = 5 m

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Question (44)

QN006225

A child pulls a sled with a constant force. If both force and displacement double, the work done becomes:

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

Correct Answer: B

Explanation:

Work becomes 2 × 2 = 4 times

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Question (45)

QN006226

The scientific reason why a person feels tired while pushing a wall despite doing zero work on it is that:

(A) Gravity acts strongly
(B) Muscles use internal energy
(C) Wall stores energy
(D) Air resistance increases

Correct Answer: B

Explanation:

Muscles consume energy internally

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Question (46)

QN006227

A force of 250 N acts opposite to displacement of 2 m. The work done by the force equals:

(A) 500 J
(B) –500 J
(C) 125 J
(D) Zero

Correct Answer: B

Explanation:

W = –250 × 2 = –500 J

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Question (47)

QN006228

In a force-displacement graph, if force is constant at 20 N from 0 m to 3 m, the work done is:

(A) 60 J
(B) 23 J
(C) 17 J
(D) 600 J

Correct Answer: A

Explanation:

Area = 20 × 3 = 60 J

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Question (48)

QN006229

A woman slowly lifts a 100 N object vertically upward through 1.5 m. Work done by her is:

(A) 150 J
(B) 15 J
(C) 66.7 J
(D) 250 J

Correct Answer: A

Explanation:

W = 100 × 1.5 = 150 J

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Question (49)

QN006230

Exact definition: “The work done on an object by a constant force” equals:

(A) Force × acceleration
(B) Force × velocity
(C) Force applied × displacement in the direction of force
(D) Mass × displacement

Correct Answer: C

Explanation:

Standard definition of work done

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Question (50)

QN006231

A person pulls a luggage bag with a force of 35 N for 14 m in the direction of motion. Calculate the work done.

(A) 490 J
(B) 49 J
(C) 2.5 J
(D) 21 J

Correct Answer: A

Explanation:

W = 35 × 14 = 490 J

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Question (41)

A coolie walks 30 m carrying a load on his head. The upward force applied by him is 500 N. Work done by this upward force is:

Explanation:

Link:

Question (42)

Which example represents positive work done?

Explanation:

Link:

Question (43)

A force of 18 N does 90 J of work. The displacement produced is:

Explanation:

Link:

Question (44)

A child pulls a sled with a constant force. If both force and displacement double, the work done becomes:

Explanation:

Link:

Question (45)

The scientific reason why a person feels tired while pushing a wall despite doing zero work on it is that:

Explanation:

Link:

Question (46)

A force of 250 N acts opposite to displacement of 2 m. The work done by the force equals:

Explanation:

Link:

Question (47)

In a force-displacement graph, if force is constant at 20 N from 0 m to 3 m, the work done is:

Explanation:

Link:

Question (48)

A woman slowly lifts a 100 N object vertically upward through 1.5 m. Work done by her is:

Explanation:

Link:

Question (49)

Exact definition: “The work done on an object by a constant force” equals:

Explanation:

Link:

Question (50)

A person pulls a luggage bag with a force of 35 N for 14 m in the direction of motion. Calculate the work done.

Explanation:

Link:

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