XI_physics_gravitation_5 Online Test

The ratio of SI units to CGS of the gravitational intensity is ____.
103
infinity
zero
102
Consider the earth to be a homogeneous sphere. Scientist A goes deep down in a mine and scientist B goes up high in a balloon. The gravitational field measured by ____.
A goes on decreasing and that by B goes on increasing
B goes on decreasing and that by A goes on increasing
each remains unchanged
each goes on decreasing
A particle of mass 10 g is kept on the surface of a uniform sphere of mass 100 kg and radius 10 cm. Find the work to be done against the gravitational force between them to take the particle far away from the sphere (you may take  _____.
6.67 ( 10–9 J
6.67 ( 10–10 J
13.34 ( 10–10 J
3.33 ( 10–10 J
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 on earth is 11.2 km/s. On another planet having twice radius and 8 time’s mass of the earth, the escape velocity will be _____.
3.7 km/s
11.2 km/s
22.4 km/s
43.2 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
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
If the earth stops rotating, the weight of a body shall
become zero
remain unaffected
increase
decrease
A body is projected vertically upwards from the surface of a planet of radius R with a velocity equal to half the escape velocity for that planet. The maximum height attained by the body is _____.
R/3
R/2
R/4
R/5
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
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