# XI_physics_gravitation_10 Online Test

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
The escape velocity from the earth is about 11 km/second. The escape velocity from a planet having twice the radius and the same mean density as the earth is _____.
22 km / s
11 km / s
5.5 km / s
15.5 km / s
 and  denotes the escape velocity from the earth and another planet having twice the radius and the same mean density as the earth. Then _____.
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
A missile is launched with a velocity less than the escape velocity. The sum of its kinetic and potential energy is _____.
Positive
Negative
Zero
May be positive or negative depending upon its initial velocity
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