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.Management Sciences
Category: Work And Energy
The escape velocity form the earth surface in km S-1 is____________________?
A. 4.2 km S-1
B. 7.5 km S-1
C. 9.5 km S-1
D. 1.1 km S-1
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
Biomass can be converted into fuels by____________________?
A. direct combustion
B. fermentation
C. both A and B
D. none of these
Gravitational P.E of a body has____________________?
A. no formula
B. a formula mgh only
C. a formula
D. no general formula
Propulsion force of a rocket is____________________?
A. non-conservative force
B. conservative force
C. both A and B
D. none of these
The source of geothermal energy is___________________?
A. decay of radioactive element in the earth
B. compression of material in the earth
C. residual lost of the earth
D. all as said in A – B and C
Work has the dimension as that of same as that of__________________?
A. torque
B. angular momentum
C. linear momentum
D. power
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
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
Slope of work time graph is equal to____________________?
A. displacement
B. acceleration
C. power
D. energy
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