A. constant
B. variable
C. zero
D. depends on situation
Related Mcqs:
- In which process all the heat supplied is converted into work done ?
A. isothermal
B. isochoric
C. isobaric
D. isentropic - The area enclosed by the curve ABCDA for a Carnot heat engine represents the work done by Carnot engine_______________?
A. at any instant
B. averagely
C. during its operation
D. during one cycle - If a body a mass of 2 kg is raised vertically through 2m, then the work done will be _________________?
A. 38.2 J
B. 392.1 J
C. 39.2 J
D. 3.92 J - The average power and instantaneous power become equal if work is done at __________________?
A. any rate
B. at variable rate
C. at uniform rate
D. at high rate - Work done by variable force is determine by dividing____________________?
A. force into small interval
B. displacement into small interval
C. both force and displacement into small intervals
D. force into small and displacement into large intervals - Work done by the force of friction is____________________?
A. always positive
B. always negative
C. positive only for small frictional force
D. positive only for large frictional force - The work done by friction is__________________?
A. positive
B. negative
C. zero
D. none of these - A field in which the work done in a moving a body along closed path is zero is called________________?
A. electric field
B. conservative field
C. electromagnetic field
D. gravitational field - An elevator weighing 3.5 x 10-6 N is raised to a height of 1000 m in the absence of friction, the work done is_________________?
A. 3.5 x 10-3 J
B. 3.5 x 104 J
C. 3.5 x 106 J
D. 3.5 x 109 J - Work done on the body equals to the _____________________?
A. change in its K.E always
B. change in its P.E always
C. change in its K.E and change in its P.E
D. neither change in K.E and nor change in its P.E
