# PHYSICS : GRAVITATION Online Test

Imagine a straight tunnel is bored through the earth and a small particle is allowed to move in it with zero initial velocity. It will
Execute S.H.M.
Come out from other side
Travel with constant velocity
Stick at the middle of the tunnel
The velocity of escape from solar system is
49 km/sec
52 km/sec
42 km/sec
53 km/sec
The ratio of gravitational potential at the centre of the solid sphere to the gravitational potential on the surface of the sphere is
5 : 2
2 : 5
5 : 3
3 : 2
What is the horizontal velocity of a satellite when it is projected at 800 km above the surface of the earth so that it will have a circular orbit about the earth? (Given, radius of the earth is 6400 km)
17.5 km/sec
1.5 km/sec
27.5 km/sec
7.5 km/sec
The gravitational potential of a spherical shell is ______ anywhere inside the shell.
The same
Different
Zero
Decreased from surface to centre
What would be the length of the day if the earth contracts to half its radius?
12 hours
24 hours
6 hours
48 hours
“The ratio of inertial masses of two bodies is same as that of their gravitational masses.” This statement
Is always violated
Always holds good sometimes holds good
Sometimes holds good
Sometimes holds and sometimes does not
Assuming the earth to be a uniform sphere, the potential at any point on the surface of the earth with radius R, is expressed as
-gR
-GR2
-gR2
gR
In the first second of its flight, a rocket ejects 1/50 of its mass with a relative velocity of 2200ms-1. What is the acceleration of the rocket?
34.2 m/s2
34.0 m/s2
30.2 m/s2
36.2 m/s2
A ray of light is bent by the sun’s gravitational field. This is explained during a
Lunar eclipse
Solar eclipse
Full moon day
New moon day
Description:

Escape velocity, gravitational potential etc are the topics included

Discussion
Kajal Sengupta
Physics 9th to 12 th grade,CIE, Edexcel, AP, IB , CBSE, ICSE
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