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WorksheetsGravitation
Total questions: 20
Worksheet time: 8mins
Planets are moving around the Sun in
elliptical orbits
circular orbits
parabolic
none of these
The gravitational force between two bodies
Is always attractive
Is always repulsive
Is inversely proportional to the distance between two bodies
Is directly proportional to the distance between two bodies
The acceleration due to gravity depends
Only on the mass of the planet
Only on the size of the planet
On both the size and mass of the planet
None of these
The value of acceleration due to gravity g will be maximum at
equatorial line
the centre of earth
the poles of Earth
midway between the pole and the equator
A body is taken from the moon to the Earth.Which is correct?
Mass decreases
Mass increases
Weight increases
Weight decreases
In which case the escape velocity is maximum
When angle of projection is 45°
When it is projected vertically up
When it is projected horizontally
The escape velocity is independent of the angle of projection
The height of a geostationary Satellite from the surface of earth is
36000 m
36000 km
3600 m
3600 km
The moon has no atmosphere because
Escape velocity is less than r.m.s velocity of gas molecules
Escape velocity is greater than r.m.s. velocity of gas molecules
Of low temperature on its surface
Its high orbital velocity
The mass of a body on the earth surface is 40 kg. Its mass at the centre of earth will be
Zero
Greater than 40 kg
Infinite
Unchanged
The weight of a body at the surface of earth is 40 N. Its weight at the centre of earth will be
Zero
Infinite
40 N
Unpredictable
Gravitational potential energy of a mass m on the surface of earth is
-GMm/R
-GMm/R²
-GM/R²
-GMm/R³
The orbital period of a geostationary satellite is
Slightly less than 24 hours
Slightly more than 24 hours
Equal to 24 hours
Equal to 12 hours
If the distance between two masses is halved,then the gravitational force of attraction between them becomes
doubled
halved
4 times
¼ times the initial value
Relation between g and G is
g=M/R²G
g=MR²/G
g=GR²/M
g=GM/R²
The satellite used to observe the entire surface of earth is
Synchronous satellite
Polar satellite
Both the above
None of the above
The areal velocity of planetary motion is
a constant
not a constant
varies with time
none of these
At what depth below the surface of earth the acceleration due to gravity becomes half the value on the surface of the earth?
R/2
R/4
R/7
R
The square of the period of revolution of a planet is directly proportional to the cube of
The mean distance of the planet from the sun
The mass of the planet
The radius of the planet
The diameter of the planet
The relation between height and depth when the acceleration due to gravity at a height h is equal to that at a depth d is given by
d=2h
h=2d
h=3d
h=3/2 d
The unit of gravitational field is
N/m
Nm²
N/s²
N/kg
