JAMB and WAEC Physics questions

829 questions with answers and explanations. Tap an option to check yourself.

All JAMB WAEC

Question 801· Work, energy and power· WAEC
As a stone falls freely towards the ground, its
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Answer: D. potential energy decreases and kinetic energy increases
Explanation and discussion
Question 802· Work, energy and power· WAEC
A pendulum bob at the lowest point of its swing has maximum
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Answer: B. kinetic energy
Explanation and discussion
Question 803· Work, energy and power· JAMB
A 0.5 kg ball is dropped from a height of 20 m. Find its speed just before it hits the ground. [g = 10 m/s²]
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Answer: B. 20 m/s
Explanation and discussion
Question 804· Work, energy and power· WAEC
Work done by a force is zero when the force is
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Answer: A. perpendicular to the displacement
Explanation and discussion
Question 805· Work, energy and power· JAMB
A 2 kg body falls freely from a height of 20 m. Find its speed just before it hits the ground.
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Answer: A. 20 m/s
Explanation and discussion
Question 806· Work, energy and power· JAMB
A boy of mass 70 kg runs up a flight of stairs 3 m high in 7 s. Find his power.
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Answer: A. 300 W
Explanation and discussion
Question 807· Work, energy and power· WAEC
A 50 kg boy climbs a 4 m staircase in 8 s. His power is (g = 10 m/s²)
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Answer: A. 250 W
Explanation and discussion
Question 808· Work, energy and power· WAEC
A pump raises 300 kg of water through 10 m in 60 s. Find its power. [g = 10 m/s²]
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Answer: C. 500 W
Explanation and discussion
Question 809· Work, energy and power· JAMB
A pump lifts 500 kg of water through a height of 12 m in 1 minute. Find its power output.
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Answer: A. 1000 W
Explanation and discussion
Question 810· Work, energy and power· WAEC
A boy of mass 50 kg climbs a staircase 4 m high in 10 s. His power is (g = 10 m/s²)
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Answer: A. 200 W
Explanation and discussion
Question 811· Work, energy and power· JAMB
An electric motor takes in 2000 W and gives out 1500 W of useful power. Find its efficiency.
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Answer: B. 75%
Explanation and discussion
Question 812· Work, energy and power· JAMB
A 2 kg stone falls freely from a height of 5 m. Find its kinetic energy just before it hits the ground.
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Answer: C. 100 J
Explanation and discussion
Question 813· Work, energy and power· JAMB
A machine lifts a 100 kg load through 4 m in 20 s. Its power output is: (g = 10 m/s²)
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Answer: C. 200 W
Explanation and discussion
Question 814· Work, energy and power· JAMB
A force of 20 N moves a body through 5 m in the direction of the force. The work done is:
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Answer: B. 100 J
Explanation and discussion
Question 815· Work, energy and power· JAMB
One kilowatt-hour is equal to
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Answer: D. 3.6 × 10⁶ J
Explanation and discussion
Question 816· Work, energy and power· WAEC
A force of 20 N moves a box through 5 m in the direction of the force. The work done is
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Answer: C. 100 J
Explanation and discussion
Question 817· Work, energy and power· WAEC
A pump raises 100 kg of water through 6 m in 30 s. Find its power. (g = 10 m/s²)
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Answer: C. 200 W
Explanation and discussion
Question 818· Work, energy and power· WAEC
A ball of mass 0.5 kg moves at 4 m/s. Its kinetic energy is
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Answer: D. 4 J
Explanation and discussion
Question 819· Work, energy and power· JAMB
A machine does 4,000 J of useful work when 5,000 J of energy is supplied. Its efficiency is
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Answer: A. 80%
Explanation and discussion
Question 820· Work, energy and power· JAMB
A 60 kg boy runs up a staircase 12 m high in 30 s. Find his power. [g = 10 m/s²]
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Answer: B. 240 W
Explanation and discussion

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JAMB and WAEC Physics questions

As a stone falls freely towards the ground, its

A pendulum bob at the lowest point of its swing has maximum

A 0.5 kg ball is dropped from a height of 20 m. Find its speed just before it hits the ground. [g = 10 m/s²]

Work done by a force is zero when the force is

A 2 kg body falls freely from a height of 20 m. Find its speed just before it hits the ground.

A boy of mass 70 kg runs up a flight of stairs 3 m high in 7 s. Find his power.

A 50 kg boy climbs a 4 m staircase in 8 s. His power is (g = 10 m/s²)

A pump raises 300 kg of water through 10 m in 60 s. Find its power. [g = 10 m/s²]

A pump lifts 500 kg of water through a height of 12 m in 1 minute. Find its power output.

A boy of mass 50 kg climbs a staircase 4 m high in 10 s. His power is (g = 10 m/s²)

An electric motor takes in 2000 W and gives out 1500 W of useful power. Find its efficiency.

A 2 kg stone falls freely from a height of 5 m. Find its kinetic energy just before it hits the ground.

A machine lifts a 100 kg load through 4 m in 20 s. Its power output is: (g = 10 m/s²)

A force of 20 N moves a body through 5 m in the direction of the force. The work done is:

One kilowatt-hour is equal to

A force of 20 N moves a box through 5 m in the direction of the force. The work done is

A pump raises 100 kg of water through 6 m in 30 s. Find its power. (g = 10 m/s²)

A ball of mass 0.5 kg moves at 4 m/s. Its kinetic energy is

A machine does 4,000 J of useful work when 5,000 J of energy is supplied. Its efficiency is

A 60 kg boy runs up a staircase 12 m high in 30 s. Find his power. [g = 10 m/s²]