Question 1

1. What is the SI unit of power?

Accepted Answer

Watt

Answer

Newton

Answer

Kilogram

Answer

Joule

Question 2

2. Work is positive when:

Accepted Answer

Force assists motion

Answer

Force opposes motion

Answer

No displacement

Answer

Force is zero

Question 3

3. What does 1 watt mean?

Accepted Answer

1 J of work in 1 second

Answer

1 N of force applied

Answer

1 W of force per meter

Answer

1 J of work in 10 seconds

Question 4

4. A 100 N force moves an object 5 m. What is the work done?

Accepted Answer

500 J

Answer

1000 J

Answer

50 J

Answer

100 J

Question 5

5. The rate of doing work is called:

Accepted Answer

Power

Answer

Energy

Answer

Force

Answer

Momentum

Question 6

6. If work is 200 J and time is 20 s, power is:

Accepted Answer

10 W

Answer

5 W

Answer

20 W

Answer

50 W

Question 7

7. A boy pushes a box with a 40 N force for 2 m. Find the work.

Accepted Answer

80 J

Answer

20 J

Answer

40 J

Answer

0 J

Question 8

8. Work is zero when:

Accepted Answer

Both A and B

Answer

None of the above

Answer

Force is zero

Answer

No displacement occurs

Question 9

9. Potential energy formula is:

Accepted Answer

mghmghmgh

Answer

W/tW/tW/t

Answer

1/2mv21/2 mv^21/2mv2

Answer

F⋅sF \cdot sF⋅s

Question 10

10. A force of 50 N acts at 90° to displacement. Work done is:

Accepted Answer

0 J

Answer

25 J

Answer

50 J

Answer

100 J

Question 11

11. Which example involves maximum power?

Accepted Answer

200 J in 2 s

Answer

500 J in 50 s

Answer

100 J in 10 s

Answer

300 J in 30 s

Question 12

12. A box is lifted by applying a force of 20 N over 3 m. Work?

Accepted Answer

60 J

Answer

20 J

Answer

0 J

Answer

40 J

Question 13

13. What is power when 500 J is done in 5 seconds?

Accepted Answer

100 W

Answer

10 W

Answer

500 W

Answer

50 W

Question 14

14. An object is lifted 5 m by a 10 N force. Work done is:

Accepted Answer

50 J

Answer

10 J

Answer

100 J

Answer

25 J

Question 15

15. 1 kW is equal to:

Accepted Answer

1000 W

Answer

10 W

Answer

1 MW

Answer

100 W

Question 16

16. An object of 5 kg is lifted to 2 m. Work done (g = 10 m/s²):

Accepted Answer

200 J

Answer

250 J

Answer

100 J

Answer

50 J

Question 17

17. A machine does 1000 J of work in 5 seconds. Power is:

Accepted Answer

200 W

Answer

500 W

Answer

1000 W

Answer

100 W

Question 18

18. Define 1 Joule of work.

Accepted Answer

1 N acting for 1 m

Answer

10 N acting for 1 m

Answer

1 J acting for 1 s

Answer

1 N acting for 1 s

Question 19

19. A roller coaster at the top of a hill has which energy?

Accepted Answer

Potential energy only

Answer

None of the above

Answer

Both energies

Answer

Kinetic energy only

Question 20

20. Power is inversely proportional to:

Accepted Answer

Time

Answer

Energy

Answer

Work

Answer

Force

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