JEE Questions for Physics Gravitation Quiz 4 - MCQExams.com

The atmosphere is held to the earth by
  • Winds
  • Gravity
  • Clouds
  • None of these
Two identical solid copper spheres of radius R are placed in contact with each other. The gravitational attraction between them is proportional to
  • R2
  • R–2
  • R4
  • R–4
The gravitational force Fg between two objects does not depend on
  • Sum of the masses
  • Product of the masses
  • Gravitational constant
  • Distance between the masses
Gravitational mass is proportional to gravitational
  • Field
  • Force
  • Intensity
  • All of these
Who among the following first gave the experimental value of G ?
  • Cavendish
  • Copernicus
  • Brook Taylor
  • None of these
If the change in the value of \'g\' at a height h above the surface of the earth is the same as at a depth x below it, then (both x and h being much smaller than the radius of the earth)
  • x = h
  • x = 2h
  • x = h/2
  • x = h2
If M is the mass of the earth and R its radius, the ratio of the gravitational acceleration and the gravitational constant is
  • g
  • g/2
  • g/3
  • g/9
The masses of two planets are in the ratio 1 : 2. Their radii are in the ratio 1 : 2. The acceleration due to gravity on the planets are in the ratio
  • 1 : 2
  • 2 : 1
  • 3 : 5
  • 5 : 3
Choose the correct statement from the following :
Weightlessness of an astronaut moving in a satellite is a situation of
  • Zero g
  • No gravity
  • Zero mass
  • Free fall
If the earth suddenly shrinks (without changing mass) of half of its present radius , the acceleration due to gravity will be
  • g/2
  • 4g
  • g/4
  • 2g
If the angular speed of the earth is doubled, the value of acceleration due to gravity (g) at the north pole
  • Doubles
  • Becomes half
  • Remains same
  • Becomes zero
Weight of 1 kg becomes 1/6 on moon. If radius of moon is 1.768 × 106 m , then the mass of moon will be
  • 1.99 × 1030 kg
  • 7.56 × 1022 kg
  • 5.98 × 1024 kg
  • 7.65 × 1022 kg
Radius of earth is around 6000 km. The weight of body at height of 6000 km from earth surface becomes
  • Half
  • One-fourth
  • One third
  • No change
Where will it be profitable to purchase 1 kg sugar ?
  • At poles
  • At equator
  • At 45o latitude
  • At 40o latitude
A body weight 500 N on the surface of the earth. How much would it weigh half way below the surface of the earth ?
  • 125 N
  • 250 N
  • 500 N
  • 1000 N
At what height from the ground will the value of \'g\' be the same as that in 10 km deep mine below the surface of earth ?
  • 20 km
  • 10 km
  • 15 km
  • 5 km
A person will get more quantity of matter in kg-wt. at
  • Poles
  • At latitude of 60o
  • Equator
  • Satellite
The mass of the moon is 7.34 × 1022 kg and the radius is 1.74 × 106 m. The value of gravitation force will be
  • 1.45 N/kg
  • 1.55 N/kg
  • 1.75 N/kg
  • 1.62 N/kg
If density of earth increased 4 times and its radius became half of what it is, our weight will
  • Be four times its present value
  • Be doubled
  • Remain same
  • Be halved
The acceleration due to gravity near the surface of a planet of radius R and density d is proportional to
  • d/R2
  • dR2
  • dR
  • d/R
If both the mass and the radius of the earth decrease by 1%, the value of the acceleration due to gravity will
  • Decrease by 1%
  • Increase by 1%
  • Increase by 2%
  • Remain unchanged
The acceleration of a body due to the attraction of the earth (radius R) at a distance 2R from the surface of the earth is (g = Acceleration due to gravity at the surface of the earth)
  • g/9
  • g/3
  • g/4
  • g
The height vertically above the earth\'s surface at which the acceleration due to gravity becomes 1% of its value at the surface is (R is the radius of the earth)
  • 8 R
  • 9 R
  • 10 R
  • 20 R
A rocket is launched with velocity 10 km/s. If radius of earth is R, then maximum height attained by it will be
  • 2R
  • 3R
  • 4R
  • 5R
What is the intensity of gravitational field at the centre of a spherical shell ?
  • Gm/r2
  • g
  • Zero
  • None of these
The kinetic energy needed to project a body of mass m from the earth surface (radius R) to infinity is
  • mgR/2
  • 2 mgR
  • mgR
  • mgR/4
In some region, the gravitational field is zero. The gravitational potential in this region
  • Must be variable
  • Must be constant
  • Cannot be zero
  • Must be zero
A particle falls towards earth from infinity. It\'s velocity on reaching the earth would be
  • Infinity
  • √2gR
  • 2√gR
  • zero
The escape velocity of a particle of mass m varies as
  • m2
  • m
  • mo
  • m-1
For the moon to cease to remain the earth\'s satellite, its orbital velocity has to increase by a factor of
  • 2
  • √2
  • 1/√2
  • -√3
The escape velocity of an object on a planet whose g value is 9 times on earth and whose radius is 4 times that of earth in km/s is
  • 67.2
  • 33.6
  • 16.8
  • 25.2
The escape velocity of a projectile on the earth\'s surface is 11.2 kms–1 . A body is projected out with thrice this speed. The speed of the body far away from the earth will be
  • 22.4 kms–1
  • 31.7 kms–1
  • 33.6 kms–1
  • None of these
Escape velocity on the earth
  • Is less than that on the moon
  • Depends upon the mass of the body
  • Depends upon the direction of projection
  • Depends upon the height from which it is projected
If acceleration due to gravity on the surface of a planet is two times that on surface of earth and its radius is double that of earth. Then, escape velocity from the surface of that planet in comparison to earth will be
  • 2ve
  • 3ve
  • 4ve
  • None of these
The escape velocity for the earth is ve. The escape velocity for a planet whose radius is four times and density is nine times that of the earth is
  • 36 ve
  • 12 ve
  • 6 ve
  • 20 ve
The potential energy of 4-particles each of mass 1kg placed at the four vertices of a square of side length 1m is
  • + 4.0 G
  • – 7.5 G
  • – 5.4 G
  • + 6.3 G
A satellite is moving around the earth with speed v in a circular orbit of radius r. If the orbit radius is decreased by 1%, its speed will
  • Increase by 1%
  • Increase by 0.5%
  • Decrease by 1%
  • Decrease by 0.5%
The value of escape velocity on a certain planet is 2 km/s. Then, the value of orbital speed for a satellite orbiting close to its surface is
  • 12 km/s
  • 1 km/s

  • Physics-Gravitation-73980.png

  • Physics-Gravitation-73981.png
The orbital speed of an artificial satellite very close to the surface of the earth is Vo. Then, the orbital speed of another artificial satellite at a height equal to three times the radius of the earth is
  • 1 Vo
  • 2 Vo
  • 0.5 Vo
  • 4 Vo
If gravitational constant is decreasing with time, what will remain unchanged in case of a satellite orbiting around earth
  • Time period
  • Orbiting radius
  • Tangential velocity
  • Angular velocity
A satellite is launched into a circular orbit Of radius R\' around earth while a second satellite is launched into an orbit of radius 1.02 R. The percentage difference in the rime periods of the two satellites is
  • 0.7
  • 1.0
  • 1.5
  • 3
Distance of geostationary satellite from the surface of earth radius (Re = 6400 km) in terms of Re is
  • 13.76 Re
  • 10.76 Re
  • 7.15 Re
  • 2.56 Re
Two satellite A and B, ratio of masses 3 : 1 are in circular orbits of radii r and 4r. Then, ratio of total mechanical energy of A to B is
  • 1 : 3
  • 3 : 1
  • 3 : 4
  • 12 : 1
Which is constant for a satellite in orbit ?
  • Velocity
  • Angular momentum
  • Potential energy
  • Acceleration
  • Kinetic energy
The time period of a satellite of earth is 5 hr. If the separation between the earth and the satellite is increased to four times the previous value, the new time period will become
  • 20 hr
  • 10 hr
  • 80 hr
  • 40 hr
To an astronaut in a spaceship, the sky appears
  • Black
  • White
  • Green
  • Blue
A geostationary satellite is revolving around the earth. To make it escape from gravitational field of earth, is velocity must be increased
  • 100%
  • 41.4%
  • 50%
  • 59.6%
According to Kepler, the period of revolution of a planet (T) and its mean distance from the sun (r) are related by the equation
  • T3r3 = Constant
  • T2r-3 = Constant
  • Tr3 = Constant
  • T2r = Constant
A satellite A of mass m is at a distance of r from the centre of the earth. Another satellite B of mass 2m is at a distance of 2r from the earth\'s centre. Their time periods are in the ratio of
  • 1 : 2
  • 1 : 16
  • 1 : 32
  • 1 : 2√2
The period of revolution of planet A around the sun is 8 times that of B. The distance of A from the sun is how many times greater than that of B from the sun?
  • 2
  • 3
  • 4
  • 5
0:0:1


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