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Class 9 Science Chapter 11 Work And Energy Quiz 2 (25 MCQs)

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1. A boy pushes a book kept on a table by applying a force of 4.5 N. find the work done by the force, if book is displaced through 30 cm along the direction of push
2. Work transfers
3. The expression for kinetic energy ( $K_E$
4. Potential energy of a body depends on its .....
5. What will cause greater change in kinetic energy of a body?
6. Energy in the form of motion.
7. A 3 kg plate is tossed across the room with an acceleration of 13 m/s$^{2}$ in 2.5 sec. Calculate the amount of power it took to toss the plate.
8. Match the energy change with the appliances.Fans and Drills are examples of what type of energy conversion
9. SI unit of power is .....
10. Mechanical energy of a body includes
11. A cyclist is moving at a speed of 5 m/s on leveled road. While going down the slop, his speed increases to 7 m/s. Here the nature of work done by gravitational force in increasing the speed of cyclist is an example of?
12. A 40 kg crate is picked up by a crane to a height of 50m. The crate falls. What is the velocity of the crate just before it hits the ground?
13. The work done on an object does not depend on the
14. Gary does 200 J of work in 10 seconds. How much power did he use?
15. When an object falls freely towards the Earth, then its total energy
16. The ability to do work or cause change:
17. A book sliding across a horizontal table slows down and comes to a stop. The book's kinetic energy was converted into what form of energy?
18. How much work is done lifting a 9.10-kg box straight up onto a shelf that is 1.80 m high? Find Force by F = Mass x Acceleration
19. Match the energy change with the appliances.Toasters and Irons are examples of what type of energy conversion
20. A ball has a 17 J of kinetic energy and its mechanical energy is 25 J. If the ball has a mass of 3.2 kg, what is its height above the ground?
21. A mother pulls her child in a wagon 75 meters along a flat horizontal sidewalk. If she applies a force of 100-N at an angle of 60 degrees above the horizontal how much work does the mother do on the wagon?
22. An object is thrown vertically upward and it reaches to a maximum height 'h' from the ground. During its flight, on reaching 3/4 of height h, it will acquire?
23. What is the formula for calculating the total amount of mechanical energy?
24. BONUS QUESTION:What is the mass of a 10kg object at the center of the earth? $g=10ms^{-2}$
25. GPE depends on gravitational acceleration and which other two things?
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