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Question (31)

QN006212

A cyclist applies brakes and stops. The work done by friction on the cycle is:

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

Correct Answer: C

Explanation:

Friction acts opposite to motion

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Question (32)

QN006213

A force of 500 N causes a displacement of 20 cm in its direction. The work done is:

(A) 100 J
(B) 10 J
(C) 1000 J
(D) 2500 J

Correct Answer: A

Explanation:

W = 500 × 0.2 = 100 J

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Question (33)

QN006214

Which statement best explains negative work done?

(A) Force acts perpendicular to displacement
(B) Force acts opposite to displacement
(C) No force acts
(D) No displacement occurs

Correct Answer: B

Explanation:

Opposite force causes negative work

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Question (34)

QN006215

A box is pulled by a horizontal force of 75 N through 6 m. The work done by the force is:

(A) 12.5 J
(B) 450 J
(C) 81 J
(D) 69 J

Correct Answer: B

Explanation:

W = 75 × 6 = 450 J

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Question (35)

QN006216

A student climbs stairs carrying a bag. The work done on the bag by the student is positive because:

(A) Force and displacement are opposite
(B) Force and displacement are perpendicular
(C) Force and displacement are in same direction
(D) Displacement is zero

Correct Answer: C

Explanation:

Positive work occurs when force and displacement are in same direction

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Question (36)

QN006217

A constant force acts on a body but work done is zero. Which pair is possible?

(A) Force = 0, displacement ≠ 0
(B) Force ≠ 0, displacement = 0
(C) Both A and B
(D) Neither A nor B

Correct Answer: C

Explanation:

Work becomes zero if force or displacement is zero

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Question (37)

QN006218

A force of 120 N acts on a cart moving 15 m. If force and displacement are along the same line, work done is:

(A) 8 J
(B) 1800 J
(C) 135 J
(D) 120 J

Correct Answer: B

Explanation:

W = 120 × 15 = 1800 J

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Question (38)

QN006219

The work done in lifting a 50 N object through 4 m vertically upward is:

(A) 200 J
(B) 46 J
(C) 12.5 J
(D) 400 J

Correct Answer: A

Explanation:

W = 50 × 4 = 200 J

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Question (39)

QN006220

Which statement from the chapter is correct?

(A) Work has magnitude and direction
(B) Work has only magnitude
(C) Work is always positive
(D) Work depends only on time

Correct Answer: B

Explanation:

Work is a scalar quantity

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Question (40)

QN006221

A player pushes a wheelchair with a force of 40 N for 25 m. The work done on the wheelchair is:

(A) 1000 J
(B) 65 J
(C) 15 J
(D) 625 J

Correct Answer: A

Explanation:

W = 40 × 25 = 1000 J

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Question (31)

A cyclist applies brakes and stops. The work done by friction on the cycle is:

Explanation:

Link:

Question (32)

A force of 500 N causes a displacement of 20 cm in its direction. The work done is:

Explanation:

Link:

Question (33)

Which statement best explains negative work done?

Explanation:

Link:

Question (34)

A box is pulled by a horizontal force of 75 N through 6 m. The work done by the force is:

Explanation:

Link:

Question (35)

A student climbs stairs carrying a bag. The work done on the bag by the student is positive because:

Explanation:

Link:

Question (36)

A constant force acts on a body but work done is zero. Which pair is possible?

Explanation:

Link:

Question (37)

A force of 120 N acts on a cart moving 15 m. If force and displacement are along the same line, work done is:

Explanation:

Link:

Question (38)

The work done in lifting a 50 N object through 4 m vertically upward is:

Explanation:

Link:

Question (39)

Which statement from the chapter is correct?

Explanation:

Link:

Question (40)

A player pushes a wheelchair with a force of 40 N for 25 m. The work done on the wheelchair is:

Explanation:

Link:

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