A bird flying in the sky has :
K.E. only
P.E. only
Neither K.E. nor P.E.
Both K.E. and P.E.
The moon revolves around the earth exerts a radial force on the moon. Does the earth perform work on the moon?
No
Yes, some times
Yes, always
Cannot be decided
The work done by a centripetal force
Increases by decreasing the radius of the circle
Decreases by increasing the radius of the circle
Increases by increasing the mass of the body
Is always zero
Two bodies of equal weight are kept at heights of h and 1.5 h respectively.The ratio of their P.E. is
3 : 2
2 : 3
1 : 1
1 : 2
1 kWh =
3.6 x 106 J
3.6 x 105 J
3.6 x 109 J
3.6 x 10-6 J
1 hp is equal to
0.746 kW
7.46 kW
74.6 kW
746 kW
When the speed of a moving object is doubled, its
Acceleration is doubled
Weight is doubled
K.E.is doubled
K.E.becomes 4 times
The energy possessed by a body due to its motion is called
Kinetic energy
Potential energy
Static energy
Mechanical energy
The mass of an object P is double the mass of Q. If both move with the same velocity, Find out the ratio of K.E.of P to Q ?
1:2
2:1
1:4
4:1
A steam engine converts :
Heat energy into sound energy
Heat energy into mechanical energy
Mechanical energy into heat energy
Chemical energy into mechanical energy
