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Physics
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Gravitation
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Easy Questions
Gravitation
Physics
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JEE Mains
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Easy Qs
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>
The escape velocity from the earth for a rocket is
1
1
.
2
km/s ignoring air resistance. The escape velocity of
1
0
mg grain of sand from the earth will be
A
0
.
1
1
2
km/s
B
1
1
.
2
km/s
C
1
.
1
2
km/s
D
0
.
0
1
1
2
kms
−
1
Easy
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>
The escape velocity for a body projected vertically upwards from the surface of earth is
1
1
km/s. If the body is projected at an angle of
4
5
0
with the vertical, the escape velocity will be
A
1
1
2
k
m
/
s
B
2
2
k
m
/
s
C
1
1
k
m
/
s
D
1
1
/
2
k
m
/
s
Easy
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>
If
g
on the surface of the Earth is
9
.
8
m
s
−
2
, its value at a height of
6
4
0
0
k
m
is:
(Radius of the Earth
=
6
4
0
0
k
m
)
A
4
.
9
m
s
−
2
B
9
.
8
m
s
−
2
C
2
.
4
5
m
s
−
2
D
1
9
.
6
m
s
−
2
Easy
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>
A satellite is revolving around the earth in an elliptical orbit. Its speed will be
A
same at all points of the orbit
B
different at different point of the orbit
C
maximum at the farthest point
D
minimum at the nearest point
Easy
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>
Which of the following quantities remain constant in a planetary motion, when seen from the surface of the sun?
A
Kinetic energy
B
Angular speed
C
Speed
D
Angular momentum
Easy
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>
The gravitational field is a conservative field. The work done in this field by moving an object from one point to another
A
depends on the end-points only.
B
depends on the path along which the object is moved.
C
depends on the end-points as well as the path between the points.
D
is not zero when the object is brought back to its initial position.
Easy
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>
At what height, the value of '
g
' is half that on the surface of the earth of radius
R
?
A
R
B
2
R
C
0
.
4
1
4
R
D
0
.
7
5
R
Easy
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>
A gravitational field is present in a region. A point mass is shifted from
A
to
B
, along different paths shown in the figure. If
W
1
,
W
2
and
W
3
represent the work done by gravitational force for respective paths, then
A
W
1
=
W
2
=
W
3
B
W
1
>
W
2
>
W
3
C
W
1
>
W
3
>
W
2
D
none of these
Easy
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>
The earth retains its atmosphere. This is due to
A
the special shape of the earth.
B
the escape velocity, which is greater than the mean speed of atmospheric molecules.
C
the escape velocity, which is less than the main speed of atmospheric molecules.
D
the suns gravitational effect.
Easy
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>
If
g
on the surface of the Earth is
9
.
8
m
s
−
2
, then it's value at a depth of
3
2
0
0
k
m
(Radius of the earth
=
6
4
0
0
k
m
) is
A
9
.
8
m
s
−
2
B
z
e
r
o
C
4
.
9
m
s
−
2
D
2
.
4
5
m
s
−
2
Easy
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>