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Gravitation
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Easy Questions
Gravitation
Physics
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The value of
$g$
at a height of
$100km$
from the surface of the Earth is nearly (Radius of the Earth
$=$
6400km) (
$g$
on the surface of the Earth
$=$
$9.8m/s_{2}$
)
A
$9.5ms_{−2}$
B
$8.5ms_{−2}$
C
$10.5ms_{−2}$
D
$9.8ms_{−2}$
Easy
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>
If
$g$
on the surface of the Earth is
$9.8ms_{−2}$
, its value at a height of
$6400km$
is:
(Radius of the Earth
$=6400km$
)
A
$4.9ms_{−2}$
B
$9.8ms_{−2}$
C
$2.45ms_{−2}$
D
$19.6ms_{−2}$
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 escape velocity from the earth for a rocket is 11.2 km/sec. Ignoring the air resistance, the escape velocity of 10 mg grain of sand from the earth will be
A
0.112 km/sec
B
11.2 km/sec
C
1.12 km/sec
D
None
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
$2R$
C
$0.414R$
D
$0.75R$
Easy
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>
The escape velocity of a body depends upon its mass as
A
$m_{0}$
B
$m_{1}$
C
$m_{3}$
D
$m_{2}$
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
$9.8$
$ms_{−2}$
, then it's value at a depth of
$3200$
$km$
(Radius of the earth
$=6400$
$km$
) is
A
$9.8$
$ms_{−2}$
B
$zero$
C
$4.9$
$ms_{−2}$
D
$2.45$
$ms_{−2}$
Easy
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>