XI_physics_gravitation_6 Online Test

If the earth stops rotating, the weight of a body shall
become zero
remain unaffected
increase
decrease
If the mass and the radius of the earth are doubled, then the escape velocity from its surface will become
two-fold
four-fold
eight-fold
remain unchanged
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
Acceleration due to gravity would be maximum
at the centre of earth
on the surface of earth
at a height of 100 km from the surface of earth
at a depth of 100 km from the surface of earth.
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
/
gp = 1/2ge
gp = ge
gp = 2ge
gp = 4 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
The masses and radii of the earth and moon are  and  respectively. Their centres are distance d apart. The minimum velocity with which a particle of mass m should be projected from a point midway between their centres so that it escapes to infinity is _____.
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