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Class 11
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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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Hard Qs
>
The escape velocity of a sphere of mass
$m$
is given by
A
$R_{e}2GMm $
B
$R_{e}2GM $
C
$R_{e}2GMm $
D
$R_{e}2GM $
Easy
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>
The escape velocity for a body projected vertically upwards from the surface of earth is
$11$
km/s. If the body is projected at an angle of
$45_{0}$
with the vertical, the escape velocity will be
A
$112 km/s$
B
$22$
$km/s$
C
$11$
$km/s$
D
$11/2 $
$km/s$
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 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 ratio of escape velocities of two planets if
$g$
values on the two planets are
$9.9$
m/s
$_{2}$
and
$3.3$
m/s
$_{2}$
and their radii are
$6400km$
and
$3400km$
respectively is
A
$2.36:1$
B
$1.36:1$
C
$3.36:1$
D
$4.36:1$
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 kinetic energy needed to project a body of mass
$m$
from earth's surface
$($
radius
$R$
$)$
to infinity is
A
$2mgR $
B
$2mgR$
C
$mgR$
D
$4mgR $
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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>