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JEE Questions for Physics Gravitation Quiz 1 - MCQExams.com
JEE
Physics
Gravitation
Quiz 1
Venus looks brighter than other planets because
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It is heavier than other planets
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It has higher density than other planets
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It is closer to the earth than other planets
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It has no atmosphere
The orbital speed of Jupiter is
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Greater than the orbital speed of earth
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Less than the orbital speed of earth
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Equal to the orbital speed of earth
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Zero
Correct form of gravitational law is
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2)
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Which of the following statements about the gravitational constant is true?
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It is a force
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It has no unit
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It has same value in all systems of unit
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It does not depend on the nature of the medium in which the bodies are kept
What happens to the acceleration due to gravity with the increase in altitude from the surface of the earth?
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Increases
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Decreases
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First decreases and then increases
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Remains same
A geo-stationary satellite orbits around the earth in a circular orbit of radius 36,000km. Then, the time period of a spy satellite orbiting a few hundred km above the earth's surface (R
earth
= 6,400km) will approximately be
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1/2 hr
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1 hr
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2 hr
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4 hr
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2)
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At what depth below the surface of the earth, the value of g is the same as that at a height of 5 km?
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1.25 km
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2.5 km
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5 km
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7.5 km
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10 km
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2)
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0%
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2)
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0%
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96 N
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108 N
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120 N
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150 N
If g is the acceleration due to gravity on the surface of earth, its value at a height equal to double the radius of earth is
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g
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2)
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If the radius of earth is R, then the height h at which the value of g becomes one-fourth, will be
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2)
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If the earth stops rotating, the value of g at the equator
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increases
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decreases
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no effect
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None of these
A body weights 500 N on the surface of the earth. How much would it weigh half-way below the surface of the earth?
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125 N
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250 N
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500 N
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1000 N
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T2 is proportional to R3
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T2 is proportional to R7/2
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T2 is proportional to R3/2
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T2 is proportional to R3/73
Average density of the earth
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does not depend on g
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is a complex function of g
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is directly proportional to g
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is inversely proportional to g
Gravitational field is
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conservative
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non-conservative
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electromagnetic
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magnetic
The required kinetic energy of an object of mass m so that it may escape, will be
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2)
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mgR
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2mgR
The value of escape velocity on a certain planet is 2 kms
-1
. Then the value of orbital speed for a satellite orbiting close to its surface is
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12 kms -1
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1 kms -1
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√2 kms -1
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2√2 kms -1
A solid sphere of uniform density and radius 4 units is located with its centre at the origin O of coordinates. Two spheres of equal radii 1 unit, with their centres at A (–2, 0 ,and B (2, 0,respectively, are taken out of the solid leaving behind spherical cavities as shown in fig Then :
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The gravitational force due to this object at the origin is zero.
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the gravitational force at the point B (2, 0 ,is zero.
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the gravitational potential is the same at all points of circle y2 + z2 = 36.
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the gravitational potential is the same at all points on the circle y2 + z2 = 4.
Earth binds the atmosphere because of
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gravity
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oxygen between earth and atmosphere
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Both (a) and (b)
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None of the above
A period of geostationary satellite is
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24 h
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12 h
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30 h
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48 h
In a satellite, if the time of revolution is T, then KE is proportional to
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2)
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If distance between earth and sun become four times, then time period becomes
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4 times
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8 times
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1/4 times
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1/8 times
LANDSAT series of satellites move in near polar orbits at an altitude of
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3600 km
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3000 km
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918 km
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512 km
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920 km
When the earth moves around the sun, the quantity which remains constant is
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angular velocity
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kinetic energy
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potential energy
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areal velocity
If the radius of the earth were to shrink by one percent, its mass remaining the same, the acceleration due to gravity on the earth’s surface would
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decrease
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remain unchanged
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increase
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be zero
If g is the acceleration due to gravity on the earth’s surface, the gain in the potential energy of an object of mass m raised from the surface of the earth to a height equal to the radius R of the earth, is
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2 mg R
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mg R
0%
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2)
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Two particles of equal mass m go around a circle of radius R under the action of their mutual gravitational attraction. The speed of each particle with respect to their centre of
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2)
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Two spherical bodies of mass M and 5 M and radii R and 2 R, respectively are released in free space with initial separation between their centres equal to 12 R. If they attract each other due to gravitational force only, then the distance covered by the smaller body just before collision is
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2.5 R
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4.5 R
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7.5 R
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1.5 R
Two balls, each of radius R, equal mass and density are placed in contact, then the force of gravitation between them is proportional to
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2)
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If M is the mass of the earth and R its radius, the ratio of the gravitational acceleration and the gravitational constant is
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2)
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Two planets have radii r
1
and r
2
densities d
1
and d
2
respectively. Then, the ratio of acceleration due to gravity on them will be
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r1d1 : r2d2
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r1d2 : r2d1
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r12d1 : r22d2
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r1 : r2
If the diameter of mass is 6760 km and mass one-tenth that of the earth. The diameter of the earth is 12742 km. If acceleration due to gravity on earth is 9.8 ms
-2
, the acceleration due to gravity on mass is
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34.8 ms -2
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2.48 ms -2
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3.48 ms -2
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28.4 ms -2
A body is taken to a height of nR from the surface of the earth. The ratio of the acceleration due to gravity on the surface to that at the altitude is
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(n + 1 ) 2
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(n + 1 ) -2
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(n + 1 ) -1
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(n + 1 )
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1 m
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0.8 m
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0.5 m
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1.25 m
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2 m
The density of the earth in terms of acceleration due to gravity (g), radius of earth (R) and universal gravitational constant (G) is
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2)
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Imagine a new planet having the same density as that of earth but it is 3 times bigger than the earth in size. If the acceleration due to gravity on the surface of earth is g and that on the surface of the new planet is g', then
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g' = 2g
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g' = 3g
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g' = 4g
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g' = 5g
If g
e
, g
h
and g
d
be the accelerations due to gravity at earth\'s surface, a height h and at depth d respectively. Then,
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ge > gh > gd
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ge > gh < gd
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ge < gh < gd
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ge < gh > gd
The weight of a body on surface of the earth is 12.6 N. When it is raised to a height half the radius of earth, its weight will be
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2.8 N
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5.6 N
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12.5 N
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25.2 N
The acceleration due to gravity becomes (g/at a height equal to (g = acceleration due to gravity on the surface of the earth)
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4R
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2)
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2R
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2)
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At what height h above earth, the value of g becomes g/2 ? (take, R = radius of earth)
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3R
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2)
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0%
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2)
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The ratio of acceleration due to gravity at a height 3R above earth's surface to the acceleration due to gravity on the surface of the earth is ( R = radius of earth )
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2)
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If a body of mass m has to be taken from the surface to the earth to a height h = R, then the amount of energy required is (R = radius of the earth)
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mgR
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2)
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0%
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Two bodies of masses m and 4m are placed at a distance r. The gravitational potential at a point on the line joining them where the gravitational field is zero, is
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2)
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zero
A body is projected with a velocity of 2 × 11.2 km/s from the surface of earth. The velocity of the body when it escapes the gravitational pull of the earth is
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√3 × 11.2 km/s
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11.2 km/s
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√2 × 11.2 km/s
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0.5 × 11.2 km/s
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2 × 11.2 km/s
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