1.When body fall freely-
A.Its PE is converted into KE
B.Its KE is converted into PE
C.Its mechanical energy is converted into heat energy
D.None of the above
2.Heat energy of an object is-
A.The average energy of the molecules of the object
B.The total energy of the molecules of the object
C.The average velocity of the molecules of the object
D.The average potential energy of the molecules of the object
3.Which one of the following changes when a particle is moving with uniform velocity-
A.Speed
B.Acceleration
C.Velocity
D.Position
4.Rocket works on the principle of conservation-
A.Mass
B.Energy
C.Momentum
D.None of these
5.The momentum of a heavy object at rest will be-
A.Zero
B.Small
C.Large
D.None of these
6.The radioactive isotope of hydrogen is called-
A.Deuterium
B.Protium
C.Radium
D.Tritium
7.Slope of the velocity-time graph gives the-
A.Distance covered by a moving body
B.Velocity of a moving body
C.Acceleration of a moving body
D.None of the above
8.Which one of the following phenomena cannot be attributed to the refraction of light?
A.Twinkling of stars
B.Mirage
C.Rainbow
D.Red shift
9.The unit of frequency of sound is—
A.Meter/second
B.Kilometer/hour
C.Hertz
D.None of these
10.The bicycles comes to rest when we stop pedaling due to-
A.Gravitation
B.Gravity
C.Friction
D.Magnetism
