Physics Practice Tests – Work, Energy and Power (Questions with Answers and Explanations)

Hello and Welcome to Physics Practice Tests - Work, Energy and Power

1. You are to attempt 5 random objectives questions ONLY.
2. Supply Your Full Name and Location in the text box below and begin immediately.
3. You can attempt as many times as possible.
1.

An object of mass 20 kg is released from a height of 10 m above the ground level. The kinetic energy of the object just before it hits the ground is ____ [g = 10 ms-2] (JAMB 2014)

A. 200 J   B. 4000 J   C. 2000 J   D. 500 J

2.

The S.I. unit of power is _____ (WASSCE 2014)

A. N     B. Pa     C. W     D. J

3.

A body is pulled through a distance of 500 m by a force of 20 N. If the power developed is 0.4 kW, calculate the time for which the force acts. (WASSCE 2012)

A. 250.0 s     B. 25.0 s      C. 2.5 s      D. 0.5 s

4.

Find the potential energy of an object of mass 10 kg placed on a building floor 10 m above the ground level. [g = 10 ms-2] (JAMB 2017)

A. 10,000 J   B. 5,000 J   C. 100 J   D. 1,000 J

5.

A man weighing 200 N runs up a staircase in 5 s. If the height of the staircase ¡s 9 m, calculate the power of the man. (WASSCE 2021)

A. 1000 W    B. 360 W    C.40 W    D. 1800 W

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