Propulsion force of a rocket is____________________?

A. Non-conservative force
B. Conservative force
C. Both a and b
D. None of these

Geothermal energy is a _______________________ source of energy?

A. Non-renewable
B. Stable
C. Renewable
D. None of the above

________________ cells converts solar energy into electrical energy?

A. Rotory
B. Photovoltaic
C. Galvanic
D. Non of these

Slope of work time graph is equal to____________________?

A. Displacement
B. Acceleration
C. Power
D. Energy

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

The tides raise the mater in the see roughly in a day___________________?

A. Once
B. Twice
C. Four time
D. Eight time

The highest value of escape velocity in solar system is planet____________________?

A. Earth
B. Neptune
C. Jupiter
D. Moon

Gravitational P.E of a body has____________________?

A. No formula
B. A formula mgh only
C. A formula
D. No general formula

When the speed of a moving body is doubled then___________________?

A. Its k.e is doubled
B. Its acceleration is doubled
C. Its p.e is doubled
D. Its momentum is doubled

Which of the following types of force can do no work on the particle on which it acts ?

A. Frictional force
B. Gravitational force
C. Elastic force
D. Centripetal force