Power and Energy NDA Questions

NDA Physics

Power and Energy MCQ Questions


1.
An engine does 500 J of work in 10 seconds What is its power output?
A.
50 W
B.
500 W
C.
100 W
D.
1000 W
😑 View Answer Rough Work Error
ANSWER :
A. 50 W
2.
Which of the following statements is true about energy and work?
A.
Work is a measure of energy transfer
B.
Energy is created during work
C.
Energy is destroyed when work is done
D.
Work has no relationship with energy
😑 View Answer Rough Work Error
ANSWER :
A. Work is a measure of energy transfer
3.
Power is defined as
A.
Energy used per unit time
B.
Force multiplied by displacement
C.
Work done per unit time
D.
Work done multiplied by time
😑 View Answer Rough Work Error
ANSWER :
C. Work done per unit time
4.
When is work done on an object?
A.
When a force is applied, causing displacement at any angle
B.
When a force is applied perpendicular to displacement
C.
When a force is applied, causing displacement in the same direction as the force
D.
When a force is applied, regardless of displacement
😑 View Answer Rough Work Error
ANSWER :
C. When a force is applied, causing displacement in the same direction as the force
5.
What is the total mechanical energy of an object in free fall?
A.
Zero
B.
Equal to its kinetic energy
C.
Equal to its potential energy
D.
Constant throughout the fall
😑 View Answer Rough Work Error
ANSWER :
D. Constant throughout the fall
6.
If the power output of a machine is constant, then the work done
A.
Increases with time
B.
Decreases with time
C.
Stays constant
D.
Varies randomly
😑 View Answer Rough Work Error
ANSWER :
A. Increases with time