INDUS RANGERS INSTITUTE PVT.
LTD
GRAVITATION
1.If the radius of the earth were to 5.If the distance between two masses
shrink by one percent, it mass is doubles ,the gravitational
remaining the same ,the value of g on attraction between them
the earth’s surface would. (a)is doubled
(a)increased by 0.5 % (b)increase (b)becomes four times
by 2% (c)is reduced half
(c)decrease by 0.5 % (d)decrease (d)is reduced to quarter
by 2% 6.The relay satellite transmits the
2.The escape velocity from the earth television programme continuously
is 11 km/s. The escape velocity a from from one part of the world to another
a planet having twice the radius and because its
the same mean density as those of the (a)period is greater than the period of
earth is rotation of the earth its axis
(a)5.5 km/s (b)11km/s (b)period is less than the period of
(c)22km/s (d)none of these rotation of the earth about its axis
3.The orbital speed of Jupiter is (c)period to equal to the period of
(a)greater than the orbital speed of rotation of the earth about its axis
the earth (d)mass is less than the mass of the
(b)less than the orbital speed of the earth
earth 7.Imagine a light planet revolving
(c)equal to the orbital speed of the around a very massive star in a
earth circular orbit of radius R with period
(d)zero T. If the gravitational force of
4. A body of mass m is taken from the attraction between the planet and the
earth’s surface to a height equal to star is proportional to ,then
the radius R of the earth .If g is the is proportional to
acceleration due to gravity at the (a) (b) (c (d)
surface of the earth, then the change 8.A satellite of mass m is revolving
in the potential energy of the body is around the earth at a height R above
(a) mgR (b) the surface of the earth. If g is the
(c)mgR (d)2 mgR gravitational field of the earth .If g is
the gravitational field intensity at the
earth’s surface and R is the radius of
INDUS RANGERS INSTITUTE PVT. LTD.
the earth, the kinetic energy of the .The ratio of the acceleration due to
satellite is gravity at their surfaces is
(a) (b) (a) (b)
(c)mgR (d)2 mgR
(c) (d)
9.The ratio of the inertia mass to
gravitational mass is equal to 14.The mass of moon is of earth’s
(a)1/2 (b)1
mass and its radius is of that of the
(c)2 (d)no fixed number
10.A missile is launched with a earth .If the escape velocity from the
velocity less than the escape velocity earth’s surface is 11.2km/s, is value
.The sum of its kinetic energy and for the moon is
potential energies is : (a)0.14 km/s (b)0.5 km/s
(a)positive (b)negative (c)2.5 km/s (d)5.0 km/s
(c)zero 15.A satellite of moving in a circular
(d)may be positive or negative orbit around the earth. If
depending upon is initial velocity gravitational pull suddenly disappear,
11.The radius of the earth is 6400 km then it
and g=10m/s².In order that a body of (a)continues to move with the same
5 kg weighs zero at the equator ,the speed along the same path
angular speed of the earth should be (b)moves with the same speed
tangential to the original orbit
(a) rad/s (b) rad/s
(c)falls down with increasing speed
(c) rad (d) rad/s (d)comes to rest after moving a
12.A planet moves around the sun. At certain distance along the original
a point Pit is closest to the sun at a path
distance and has a speed .At 16.If the distance between the earth
another point Q, when it is farthest and the sun were half its present
from the sun at a distance ,It speed value, the number of days in a year
will be would have been about
(a)64.5 (b)129 (c)182.5 (d)730
(a) (b)
17.If the earth were at one-fourth its
(c) (d) present distance from the sun ,the
duration of the year will be
13.Two planets have radii (a)half the present year
and densities respectively (b)one –fourth the present year
4th floor Shakumbhari Complex, Chetmani Chauraha, Bhelupur
9936404655, www.indusranger.com indusrangers@gmail.com
INDUS RANGERS INSTITUTE PVT. LTD.
(c)one –sixth the present year (c)The time period of a satellite does
(d)one –eight the present year not depend on the radius of the orbit
18.A planet is moving in a elliptic (d)The orbital velocity is inversely
orbit .If T,V,E and L stand proportional to the square root of the
respectively, for its kinetic energy, radius of the orbit
gravitational potential energy ,total 22.The time period of an earth
energy and angular momentum about satellite close to the surface of the
the centre of force ,then earth is 8.3 minutes .The time period
(a)T is conserved of another earth satellite in an orbit
(b)V is always positive at a distance of three earth radii from
(c)E is always negative its surface will be
(d)magnitude of L is conserved but (a)83 minutes (b)83√ minutes
its direction changes continuously (c)664 minutes (d)249minutes
19.If the mean radius of earth is R, its 23.The gravitational field due to a
angular velocity is , and the mass distribution is E=K/x in the x-
acceleration due to gravity at the direction ,where K is a constant
surface of the earth is g, then the Taking at a distance x is
cube of the radius of the orbit of a (a)K/x (b)K/2x (c)K/x² (d)K/2x
geostationary satellite will be 24.Two satellites A and B go round a
(a) (b) planet P in circular orbits having
(c) /g (d)R g/ radii 4R and R respectively .If the
20.Two planes of radii are speed of A is 3 V, that of B will be
made of the same material. The ratio (a)12 V (b)6V (c) V (d)
of the acceleration due to gravity at
25.If the value of g at the surface of
the surfaces of the two planet is
the earth is 9.8m/s²,then the value of
(a) (b)
g at a place 480 km above the surface
(c)( (d) ( of the earth will be (radius of earth
21.Select the only correct statement =6400 km)
from the following (a)4.2 m/s² (b)7.2m/s²
(a)The orbital velocity of a satellite (c)8.5m/s² (d)9.8m/s²
increase with the radius of the orbit 26. The average distance of two
(b)Escape velocity of a particle from planets from the sun are in the ratio
the surface of the earth depends on 1:2.The time period of revolution are
the speed with which it is fired I approximately ratio
4th floor Shakumbhari Complex, Chetmani Chauraha, Bhelupur
9936404655, www.indusranger.com indusrangers@gmail.com
INDUS RANGERS INSTITUTE PVT. LTD.
(a)1:2 (b)1:2√ (c)1:4 25% if its value at the earth’s surface
(d)1:8 is
27.The escape velocity from the (a)R/4 (b)R (c)3R/8 (d)R/2
surface of a planet is m/s. If a
mass of 2 kg falls from infinity to the
surface of the planet, its kinetic
energy on reaching the surface will be
(a) J, zero
(b) J, J
(c)0.5 x J,0.5 x J
(d) ) J, ) J
28.The gravitational force between
two points masses at a
separation r is given by F=k
.The constant K.
(a)depends only on the system of
unit
(b)depends only on the medium
between the masses
(c)depends on both
(d)in independent of both (a) and (b)
29.If a rocket is to be projected
vertically upwards from the surface
of the earth ,it requires an escape
velocity of 11 km/s .If the rocket is to
be projected at an angle of 60° with
the vertical, the escape velocity
required will be about
(a)5.5 km/s (b)11√ km/s
(c)11km/s (d)5.5 x√ km/s
30.If R is the radius of the earth
then the altitude at which the
acceleration due to gravity will be
4th floor Shakumbhari Complex, Chetmani Chauraha, Bhelupur
9936404655, www.indusranger.com indusrangers@gmail.com
