# XI_physics_gravitation_3 Online Test

If the earth stops rotating, the weight of a body shall
become zero
remain unaffected
increase
decrease
The kinetic energy needed to project a body of mass m from the earth surface (radius R) to infinity is _____.
mgR/2
2 mgR
mgR
mgR/4
/
gp = 1/2ge
gp = ge
gp = 2ge
gp = 4 ge
Given: mass of the earth is 80 times the mass of moon, and the radius of the moon is 1/4th the radius of the earth. The value of acceleration due to gravity on the surface of moon will be ___ where ge denotes the acceleration due to gravity on the surface of earth.
0.16 ge
0.20 ge
0.24 ge
0.32 ge
Imagine that the diameter of the earth becomes twice its present value but its mass remains unchanged. Then the weight of an object on its surface will become _____________ the present value
one-half
one-fourth
three-fourth
remain unchanged
Weightlessness experienced while orbiting the earth in spaceships is the result of
inertia
acceleration
zero gravity
pull by other planets
AN artificial satellite stays in orbit around the earth. This may be attributed to
upward pull of the satellite
negligible earth’s gravitational field
centripetal force provided by earth’s gravitational acceleration
equilibrium between forces of attraction due to earth and other planets
A body weighing 1.6 kN at sea level is taken to a place which is 2000 km above sea level. The weight of body at that location will be
0.075 kN
0.9 kN
1.125 kN
1.2 kN
If the earth stops rotating, the weight of a body shall
become zero
remain unaffected
increase
decrease
If the earth stops rotating, the weight of a body shall
become zero
remain unaffected
increase
decrease
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