Question 1

1. What is the SI unit of work?

Accepted Answer

Joule

Answer

Kilogram

Answer

Newton

Answer

Watt

Question 2

2. Work is done when:

Accepted Answer

Both A and B

Answer

None of the above

Answer

There is displacement

Answer

A force is applied

Question 3

3. When is no work done?

Accepted Answer

Force is applied perpendicular

Answer

Object moves with force

Answer

All of the above

Answer

Object is displaced

Question 4

4. Formula for power is:

Accepted Answer

P=WtP = \frac{W}{t}P=tW​

Answer

P=W⋅tP = W \cdot tP=W⋅t

Answer

P=FsP = \frac{F}{s}P=sF​

Answer

P=F⋅sP = F \cdot sP=F⋅s

Question 5

5. Work depends on:

Accepted Answer

Force and displacement

Answer

Force and time

Answer

None of the above

Answer

Displacement and time

Question 6

6. What happens when force is perpendicular to displacement?

Accepted Answer

No work

Answer

Positive work

Answer

Negative work

Answer

Maximum work

Question 7

7. What is the work done by a 10 N force moving a box 2 m?

Accepted Answer

20 J

Answer

5 J

Answer

10 J

Answer

30 J

Question 8

8. What is the power output for 1000 J work in 10 s?

Accepted Answer

100 W

Answer

1000 W

Answer

0.1 W

Answer

10 W

Question 9

9. An object moves without displacement. How much work is done?

Accepted Answer

0 J

Answer

Infinite

Answer

Depends on force

Answer

10 J

Question 10

10. Lifting an object involves:

Accepted Answer

Both energies

Answer

Potential energy only

Answer

Kinetic energy only

Answer

None of the above

Question 11

11. SI unit of power is:

Accepted Answer

Watt

Answer

Joule

Answer

Kilogram

Answer

Newton

Question 12

12. Work done is negative when:

Accepted Answer

Force opposes motion

Answer

Force assists motion

Answer

Both A and C

Answer

No displacement

Question 13

13. What is 1 horsepower in watts?

Accepted Answer

746 W

Answer

735 W

Answer

750 W

Answer

1000 W

Question 14

14. A crane lifts 10 kg to 5 m. Work done is (g = 9.8 m/s²):

Accepted Answer

490 J

Answer

50 J

Answer

98 J

Answer

500 J

Question 15

15. Which object has the most power output?

Accepted Answer

50 J in 1 s

Answer

100 J in 10 s

Answer

10 J in 5 s

Answer

1000 J in 100 s

Question 16

16. What is the work done by 50 N force moving 5 m?

Accepted Answer

250 J

Answer

100 J

Answer

500 J

Answer

150 J

Question 17

17. A man holds a bag without moving it. Work done is:

Accepted Answer

Zero

Answer

Maximum

Answer

Positive

Answer

Negative

Question 18

18. Define one joule of work.

Accepted Answer

1 N acting for 1 m

Answer

1 J acting for 1 second

Answer

1 N acting for 1 second

Answer

10 N acting for 1 m

Question 19

19. Energy transfer in a roller coaster is primarily:

Accepted Answer

Potential to kinetic

Answer

Kinetic to thermal

Answer

Kinetic to chemical

Answer

None of the above

Question 20

20. How is power related to time?

Accepted Answer

Inversely proportional

Answer

Depends on displacement

Answer

Directly proportional

Answer

No relation

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