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Class 9 Science Chapter 11 Work And Energy Quiz 1 (25 MCQs)

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1. A worker climbs a ladder and does 8 J of work on a 2 N object. What is the distance they lift the object?
2. Water stored in a dam possesses ..... energy.
3. Two factors that determine work are
4. Which of the following has potential energy?
5. A particle of mass m is at rest is acted upon by a force F for a time t. Its kinetic energy after an interval of t is:
6. Food is what type of energy
7. A body is falling from a height h. After it has fallen a height h/2, it will possess
8. What is a device that makes work easier?
9. If I have a 10 kg bowling that is sitting on top of a shelf and has 200 J of GPE, how tall is the shelf?
10. In case of negative work, angle between force and work is-
11. An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass is 3.5 kg. Both spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same
12. A man of mass 50 kg jumps to a height of 1 m. His potential energy at the highest point is(g = 10 m/s$^{2}$)
13. What is the formula for Work?
14. A satellite revolving around the earth does 0J of work ONLY because displacement at the end of one revolution is 0m
15. A roller coaster has both kinetic and potential energy.
16. Using the scientific definition, which statement is always true of work?
17. Which one of the following is not the unit of work?
18. A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car
19. Which formula should you use to calculate work?
20. Which one of the following is the commercial unit of energy?
21. In a simple pendulum mass of bob is 100 g and effective length is L. Work done on the pendulum in one complete oscillation by gravitational force is:
22. The coefficient of kinetic friction between a large box and the floor is 0.21. A person pushes horizontally on the box with a force of 165 N for a distance of 2.8 m. If the mass of the box is 72 kg, what is the total work done on the box? (Round your answer to a whole number)
23. Two army persons A and B each of weight of 500N climb up a rope through a height of 10m. A takes 20s while B takes 40s to achieve this task. what is ratio of the power of person A and B?
24. A dog weighing 25 kg, while chasing a cat, jumps over a fence of height 1.6 m. What is the potential energy of dog at the top of fence?(Take 'g'=10 m s$^{-2}$ )
25. One joule work is said to be done when .....
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