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Class 11
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Physics
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Gravitation
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Medium Questions
Gravitation
Physics
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If R
=
radius of the earth and g
=
acceleration due to gravity on the surface of the earth, the acceleration due to gravity at a distance (r>R) from the centre of the earth is proportional to
A
r
B
r
2
C
r
−
2
D
r
−
1
Medium
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>
The height at which the value of acceleration due to gravity becomes
5
0
% of that at the surface of the earth (Radius of the earth
=
6
4
0
0
km) is nearly
A
2
6
5
0
km
B
2
4
3
0
km
C
2
2
5
0
km
D
2
3
5
0
km
Medium
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>
A missile is launched with a velocity less than the escape velocity. The sum of its kinetic and potential energies is
A
positive
B
negative
C
zero
D
may be positive or negative depending upon its initial velocity
Medium
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>
If R
=
radius of the earth and g
=
acceleration due to gravity on the surface of the earth, the acceleration due to gravity at a distance (r
A
r
B
r
2
C
r
−
2
D
r
−
1
Medium
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>
A man covers
6
0
m
distance in one minute on the surface of earth. The distance he will cover on the surface of moon in one minute is
(
g
m
=
6
g
e
)
A
6
0
m
B
6
0
X
6
m
C
6
6
0
m
D
6
0
m
Medium
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>
The depth at which the value of
g
becomes
2
5
%
of that at the surface of the earth.
(
Radius of the earth
=
6400km.
)
A
4800 km
B
2400 km
C
3600 km
D
1200 km
Medium
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>
A body has weight (W) on the ground. The work which must be done to lift it to a height equal to the radius of the earth, R, is
A
equal to W
×
R
B
greater than W
×
R
C
less than W
×
R
D
Cannot be determined
Medium
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>
The ratio of the radius of a planet A to that of planet B is
r
. The ratio of accelerations due to gravity for the two planets is
x
. The ratio of the escape velocities from the two planets is :
A
r
x
B
x
r
C
r
D
r
x
Medium
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>
The ratio of acceleration due to gravity at a depth
h
below the surface of earth and at a height
h
above the surface for
h
<
<
R
A
is constant.
B
increases linearly with h.
C
varies parabolically with h.
D
decreases.
Medium
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>
Consider Earth to be a homogeneous sphere. Scientist A goes deep down in a mine and scientist B goes high up in a balloon. The gravitational field measured by
A
A goes on decreasing and that of B goes on increasing
B
B goes on decreasing and that of A goes on increasing
C
each decreases at the same rate
D
each decreases at different rates
Medium
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>