Test Session No 7

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Mcqs :

 _ALHAMDO LILAH 
 1) Number of MCQs* 
    30 per test
 2) TEST TIMING 
   08:00pm to 09:00pm
 3) TEST DATE 
   15/12/2021 
 4) TEST SUBJECT 
   PHYSICS
 *5) CHAPTER NAME 

Work and Energy
 TEST PREPARED BY 
Syeda Manahil Ali

Details:
CHAPTER#2 
 Work and Energy. 
⮚ work
⮚ Energy
⮚ Kinetic energy
⮚ Potential energy
⮚ Gravitational potential energy
⮚ Power
Learning Outcomes
⮚ Describe the concept of work in terms of the product of force F and displacement d in 
the direction of force (Work as scalar product of F and d).
⮚ Define Energy 
⮚ Explain Kinetic Energy
⮚ Explain the Difference between Potential energy and gravitational Potential energy.
⮚ Describe that the gravitational PE is measured from a reference level and can be positive 
or negative, to denote the orientation from the reference level.
⮚ Express power as scalar product of force and velocity.
⮚ Explain that work done against friction is dissipated as heat in the environment.
⮚ State the implications of energy losses in practical devices
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Mcqs:

 1. Work done will be maximum at:
A. 0°
B. 45°
C. 90°
D. 30°
 2. Work done will be 0 if angle between force and 
displacement is:
A. 0°
B. 60°
C. 270°
D. 360°
 3. A man pushes a wall with a 50N and it displaces it 0 meter 
, his work is:
A. Negative
B. Positive
C. No work 
D.All are possible
 4. Energy stored in the spring of watch is:
A. Electrical energy
B. Potential energy
C. K.E
D. Elastic potential energy 
 5. Work done on a body is equal to change in its ..... Energy
A. Total energy
B. K.E
C. P.E
D.All of these 
 6. Work energy principal is valid for:
A. Change in K.E
B. Change in P.E
C. Change in E.P.E
D.All type of energies
 7. Energy consumed by 60W bulb in 20min is equal to:
A. 7.2J
B. 120J
C. 720J
D. 72000J
 8. Unit of efficiency is:
A. Watt 
B. Joule
C. hp
D. no unit
 9. In a freely falling body system , if P.E is equal to K.E , then 
force of friction of air will be:
A. Be negligible
B. Zero
C. Maximum
D. Can’t be predicted
 10. The time taken by an engine of power 10KW to lift a 
mass of 200Kg to the height of 40m is:
A. 2s
B. 4s
C. 8s
D. 16s
 11. A body travels Displacement of 10m by force of 5N , if 
work done is 25 J then angle between F and D is:
A. 0°
B. 30°
C. 45°
D. 60°
 12. The K.E of a body of mass 1kg and momentum 2N is 
equal to:
A. 1J
B. 10J
C. 5J
D. 2J
 13. A light and a heavy body have equal K.E . Which one 
has Greater Momentum:
A. Light body 
B. Heavy body 
C. Have same P 
D. Can’t be predicted
 14. The amount of work required to stop a moving object 
is equal to:
A. Velocity of object
B. Mass of object times it’s velocity
C. K.E of object 
D.Mass of object times it’s acceleration
 15. Which one of the following is greater work?
A. +100J
B. -100J
C. -1000J
D. +200J
 16. When a body moves against the force of friction in a 
horizontal plane, the work done by body is:
A. Negative
B. Positive
C. Zero
D.May be positive or negative
 17. Which of the following is Conservative field?
A. Gravitational field 
B. Electric field 
C. Magnetic field 
D.All
 18. Most common characteristic of all the conservative 
forces is that they all are:
A. Velocity Dependent
B. Position Dependent
C. Time Dependent
D.All
 19. A bullet is fired from a rifle. If the rifle recoils freely , 
then the K.E of rifle is:
A. Less than that of bullet 
B. Greater than that of bullet 
C. Same as that of bullet 
D.May be a or b
 20. The power output of lamp is 6W. How much energy 
does the lamp give out in 2 min ? 
A. 3J
B. 120J
C. 720J
D. 430J
 21. Slope of work- time graph is equal to?
A . Displacement 
B. Acceleration
C. Power 
D. Energy 
 22. Heat energy dissipated by a 40W bulb in one hour is equal 
to:
A. 1440J
B. 144000J
C. 14000J
D. 1.440J
 23. Resistive forces are :
A. Conservative
B. Non conservative
C. Both 
D. None
 24. The work done depends on:
A. Magnitude of force 
B. Magnitude of displacement
C. Angle between force and displacement
D. All
 25. If velocity is 2 times then:
A. P increases 4 times and K.E increase 2 times 
B. P and K.E remains same 
C. P and K.E both Increases 2 times 
D. P increase 2 times and K.E increases 4 times 
 26. If P of a moving object is doubled the K.E will be:
A. Doubled
B. Halved 
C. Four times 
D. Same 
 27. When force and displacement are in same direction , K.E Of 
body:
A. Increases
B. Decreases
C. Remain Constant
D. Become zero 
 28. A body is falling from a height h . After it has fallen a height 
h/2 , it will possess:
A. Only P.E
B. Half potential and half K.E
C. Only K.E
D. More K.E and Less Potential energy 
 29 . If force and displacement of particle in the direction of are 
Doubled. Work done would be:
A. Double 
B. Half 
C. ¼ times 
D. 4 times 
 30. The momentum and K.E of a ball is numerically equal . The 
numerical value of velocity is:
A. 1m/s
B. 3m/s
C. 2m/s
D. 4m/s

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Key


 
1. A
2. C
3. C
4. D
5. B
6. D
7. A
8. D
9. B
10.C
11.D
12.D
13.B
14.C
15.C
16.B
17.D
18.B
19.A
20.C
21.C
22.B
23.B
24.D
25.D
26.C
27.A
28.B
29.D
30.C
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regards: Liaqat Mdcat Team