31.Stability of a racing car is increased by
a) Increasing its height
b) Raising its Centre of gravity
c) Decreasing its width
d) Lowering its Centre of gravity
32. The springs in brakes and clutches are used
a) To restore original position
b) To measure forces
c) To absorb shocks
d) To absorb strain energy
33. If the material recovers the original dimensions, when an external force is removed, this deformation is known as ______ deformation.
a) Inelastic b) Permanent
c) Elastic d) Irreversible
34. Which of the following material is more elastic?
a) Rubber b) Glass
c) Steel d) Wood
35. If a spring stretches easily then its spring constant has _____.
a) Large value b) Small value
c) Constant Value d) Both (a) and (b)
36. What is the unit for the spring constant?
a) Nm-2 b) Nm-1
c) N/m2 d) N/m
36. Which of the following is not a unit of pressure?
a) Pascal b) Bar
c) Atmosphere d) Newton
37. The motion of a falling ball towards Earth is due to the ———–.
a) Weightlessness
b) Gravitational force
c) Acceleration due to gravity
d) Both ‘a’ and ‘b’
38. Newton’s law of gravitation holds between every two objects on the ———–.
a) on Earth b) on Jupiter
c) on Moon d) on Universe
39. Gravitational field of Earth is directed ————–.
a) towards the Earth b) towards the Sun
c) towards the Moon d) away from Earth
40. ——————– was the first scientist who gave the concept of gravitation.
a) Einstein b) Newton
c) Faraday d) Maxwell
