XI_physics_gravitation_4 Online Test

If the earth stops rotating, the weight of a body shall
become zero
remain unaffected
increase
decrease
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.
/
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
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
The gravitational field due to a mass distribution is  in the x-direction. (K is a constant). Taking the gravitational potential to be zero at infinity, its value at a distance x is _____.
K/x
K/2x
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 _____.
The escape velocity of a rocket launched from the surface of the earth ____.
Does not depend on the mass of the rocket
Does not depend on the mass of the earth
Depends on the mass of the planet towards which it is moving
Depends on the mass of the rocket
In some region, the gravitational field is zero. The gravitational potential in this region _____.
Must be variable
Must be constant
Cannot be zero
Must be zero
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