XI_physics_gravitation_9 Online Test

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
 and  denotes the escape velocity from the earth and another planet having twice the radius and the same mean density as the earth. Then _____.
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
The escape velocity for the earth is 11.2 km/sec. The mass of another planet is 100 times that of the earth and its radius is 4 times that of the earth. The escape velocity for this planet will be _____.
112.0 km/s
5.6 km/s
280.0 km/s
56.0 km/s
The escape velocity of a body on the surface of the earth is 11.2 km/s. If the earth's mass increases to twice its present value and the radius of the earth become half, the escape velocity would become _____.
5.6 km/s
11.2 km/s (remain unchanged)
22.4 km/s
44.8 km/s
Escape velocity on earth is 11.2 km/s. What would be the escape velocity on a planet whose mass is 1000 times and radius is 10 times that of earth?
112 km/s
11.2 km/s
1.12 km/s
3.7 km/s
Escape velocity on the earth _____.
Is less than that on the moon
Depends upon the mass of the body
Depends upon the direction of projection
Depends upon the height from which it is projected
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
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
Weightlessness experienced while orbiting the earth in spaceships is the result of
inertia
acceleration
zero gravity
pull by other planets
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