MCQ Conservation of Energy and Power Chapter 10 Class 9 Science

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MCQ’s For All Chapters – Science Class 9th

1. According to the law of conservation of energy, energy can be

Question 1 of 20

2. The total energy before and after a transformation remains

Question 2 of 20

3. During free fall, potential energy of an object

Question 3 of 20

4. During free fall, the loss in potential energy appears as

Question 4 of 20

5. The total mechanical energy (potential + kinetic) of a freely falling body is

Question 5 of 20

6. At the highest point of a free fall, an object has

Question 6 of 20

7. When a freely falling object is just about to touch the ground, it has

Question 7 of 20

8. The total mechanical energy of a freely falling body ignoring air resistance is

Question 8 of 20

9. The expression for total mechanical energy of a body is

Question 9 of 20

10. The term “rate of doing work” refers to

Question 10 of 20

11. The formula for power is

Question 11 of 20

12. The SI unit of power is

Question 12 of 20

13. One watt is equal to

Question 13 of 20

14. If a machine does 100 J of work in 2 seconds, its power is

Question 14 of 20

15. Power of 1 kilowatt is equal to

Question 15 of 20

16. If two girls climb the same height but one does it faster, then

Question 16 of 20

17. Power measures

Question 17 of 20

18. A girl lifts a weight of 400 N to a height of 8 m in 20 s.Her power is

Question 18 of 20

19. A boy of weight 500 N climbs a 6.75 m staircase in 9 s.His power is

Question 19 of 20

20. Average power is defined as

Question 20 of 20


 

Comments

  1. Rachna Puri says:
    February 12, 2025 at 10:47 am

    Good questions

    Reply

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