JEE Questions for Physics Gravitation Quiz 11 - MCQExams.com

The curves for potential energy (U) and kinetic energy (Ek) of a two particle system are shown in figure. At what points the system will be bound
Physics-Gravitation-74676.png
  • Only at point D
  • Only at point A
  • At point D and A
  • At points A, B and C
A shell of mass M and radius R has a point mass m placed at a distance r from its centre. The gravitational potential energy U (r) vs r will be

  • Physics-Gravitation-74677.png
  • 2)
    Physics-Gravitation-74678.png

  • Physics-Gravitation-74679.png

  • Physics-Gravitation-74680.png
The radius and mass of earth are increased by 0.5%. Which of the following statements are true at the surface of the earth ?
  • g will increase
  • g will decrease
  • Escape velocity will remain unchanged
  • Potential energy will remain unchanged
  • All 2,3 and 4
The mean radius of the earth\'s orbit round the sun is 1.5 × 1011. The mean radius of the orbit of mercury round the sun is 6 × 1011 m. The mercury will rotate around the sun in
  • A year
  • Nearly 4 years
  • Nearly 1/4 year
  • 2.5 years
Two identical satellites A and B are circulating round the earth at the height of R and 2R respectively, (where R is radius of the earth). The ratio of kinetic energy of A to that of B is
  • 3/2
  • 1/2
  • 2/3
  • 2
An earth satellite is moved from one stable circular orbit to a further stable circular orbit, which one of the following quantities increase
  • Gravitational force
  • Gravitational P.E.
  • Linear orbital speed
  • Centripetal acceleration
A man inside an artificial satellite feels weightlessness because the force of attraction due to earth is
  • Zero at that place
  • Is balanced by the force of attraction due to moon
  • Equal to the centripetal force
  • Non-effective due to particular design of the satellite
Time period of revolution of a nearest satellite around a planet of radius R is T. Period of revolution around another planet, whose radius is 3R but having same density is
  • T
  • 3T
  • 9T
  • 3√3T
The ratio of the radius of a planet \'A\' to that of planet \'B\' is \'r\' . The ratio of acceleration due to gravity on the planets is \'x\'. The ratio of the escape velocities from the two planets is
  • xr
  • 2)
    Physics-Gravitation-74687.png

  • Physics-Gravitation-74688.png

  • Physics-Gravitation-74689.png
A clock S is based on oscillation of a spring and a clock P is based on pendulum motion. Both clocks run at the same rate on earth. On a planet having the same density as earth but twice the radius
  • S will run faster than P
  • P will run faster than S
  • They will both run at the same rate as on the earth
  • None of the above

Physics-Gravitation-74692.png

  • Physics-Gravitation-74693.png
  • 2)
    Physics-Gravitation-74694.png
  • Moon is the satellite of the earth
  • None of the above
A body falls freely under gravity. Its speed is v when it has lost an amount U of the gravitational energy. Then, its mass is

  • Physics-Gravitation-74696.png
  • 2)
    Physics-Gravitation-74697.png

  • Physics-Gravitation-74698.png
  • 2Ugv2
If a planet consists of a satellite whose mass and radius were both half that of the earth, the acceleration due to gravity at its surface would be (g on earth = 9.8 m/sec2 )
  • 4.9 m/sec2
  • 8.9 m/sec2
  • 19.6 m/sec2
  • 29.4 m/sec2
At a given place where acceleration due to gravity is \'g\' m/sec2 , a sphere of lead of density \'d\' kg/m3 is gently released in a column of liquid of density \'ρ\' kg/ m3. If d > ρ, the sphere will
  • Fall vertically with an acceleration 'g' m/sec2
  • Fall vertically with no acceleration
  • Fall vertically with an acceleration
    Physics-Gravitation-74701.png
  • Fall vertically with an acceleration
    Physics-Gravitation-74702.png
ge and gp denote the acceleration due to gravity on the surface of the earth and another planet whose mass and radius are twice as that of earth. Then,
  • gp = ge
  • gp = ge/2
  • gp = 2ge
  • gp = ge/4
At some point the gravitational potential and also the gravitational field due to earth is zero. The point is
  • On earth's surface
  • Below earth's surface
  • At a height Re from earth's surface (Re = Radius of the earth)
  • At infinity
The acceleration due to gravity about the earth\'s surface would be half of its value on the surface of the earth at an altitude of (R = 4000 miles)
  • 1200 miles
  • 2000 miles
  • 1600 miles
  • 4000 miles
A pendulum clock is set to give correct time at the sea level. This clock is moved to hill station at an altitude of 2500 m above the sea level. In order to keep correct time of the hill station, the length of the pendulum
  • Has to be reduced
  • Has to be increased
  • Needs no adjustment
  • Needs no adjustment but its mass has to be increased
Assertion If earth suddenly stops rotating about its axis, then the value of acceleration due to gravity will become same at all the places.
Reason The value of acceleration due to gravity is independent of rotation of earth.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true.
Assertion The difference in the value of acceleration due to gravity at pole and equator is proportional to square of angular velocity of earth
Reason The value of acceleration due to gravity is minimum at the equator and maximum at the pole.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true.
Assertion For the planets orbiting around the sun, angular speed, linear speed, K.E. changes with time , but angular momentum remains constant .
Reason No torque is acting on the rotating planet. So its angular momentum is constant.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true.
Assertion The speed of revolution of an artificial satellite revolving very near the earth is 8 kms-1.
Reason Orbital velocity of a satellite, become independent of height of satellite.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true.
Assertion Gravitational potential of earth at every place on it is negative.
Reason Every body on earth is bound by the attraction of earth.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true.
Assertion Even when orbit of a satellite is elliptical , its plane of rotation passes through the centre of earth.
Reason According to law of conservation of angular momentum plane of rotation of satellite always remain same.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true.
Assertion A planet moves faster, when it is closer to the sun in its orbit and vice versa.
Reason Orbital velocity in the orbit of planet is constant.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true.
Assertion Orbital velocity of a satellite is greater than its escape velocity
Reason Orbit of a satellite is within the gravitational field of earth whereas escaping is beyond the gravitational field of earth.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true.
Assertion The time period of geostationary satellite is 24 hr.
Reason Geostationary satellite must have the same time period as the time taken by the earth to complete one revolution about its axis .
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true.
Assertion The principle of superposition is not valid for gravitational force.
Reason Gravitational force is a conservative force.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true.
Assertion Two different planets have same escape velocity
Reason Value of escape velocity is a universal constant.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true.
Assertion The time period of revolution of a satellite close to surface of earth is smaller than that revolving away from surface away from surface of earth.
Reason The square of time period of revolution of a satellite is directly proportional to cube of its orbital radius.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true.
Assertion For a satellite revolving very near to earth\'s surface the time period of revolution is given by 1 hour 24 minutes.
Reason The period of revolution of a satellite depends only upon its height above the earth\'s surface.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true.
Assertion Generally the path of a projectile from the earth is parabolic but it is elliptical for projectiles going to a very large height
Reason The path of a projectile is independent of the gravitational force of earth.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true.
Assertion Space rockets are usually launched in the equatorial line from west to east
Reason The acceleration due to gravity is minimum at the equator.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true.
Assertion The binding energy of a satellite does not depend upon the mass of the satellite .
Reason Binding energy is the negative value of total energy of satellite.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true.
The tidal waves in the sea are primarily due to
  • The gravitational effect of the moon on the earth
  • The gravitational effect of the sun on the earth
  • The gravitational effect of venus on the earth
  • The atmospheric effect of the earth itself
A point mass m is placed inside a spherical shell of radius R and mass M, at a distance R/2 from the centre of the shell. The gravitational force exerted by the shellon the point mass is

  • Physics-Gravitation-74718.png
  • 2)
    Physics-Gravitation-74719.png
  • Zero

  • Physics-Gravitation-74720.png
A satellite of the earth is revolving in a circular orbit with a uniform speed v. If the gravitational force suddenly disappears, the satellite will
  • Continue to move with velocity v along the original orbit
  • Move with a velocity v, tangentially to the original orbit
  • Fall down with increasing velocity
  • Ultimately come to rest somewhere on the original orbit
If the distance between two masses is doubled, the gravitational attraction between them
  • Is doubled
  • Becomes four times
  • Is reduced to half
  • Is reduced to a quarter
Two sphere of mass m and M are situated in air and the gravitational force between them is F. The space around the masses is now filled with a liquid of specific gravity 3. The gravitational force will now be
  • F
  • 2)
    Physics-Gravitation-74723.png

  • Physics-Gravitation-74724.png
  • 3F
Two particles of equal mass go round a circle of radius R under the action of their mutual gravitational attraction. The speed of each particle is

  • Physics-Gravitation-74725.png
  • 2)
    Physics-Gravitation-74726.png

  • Physics-Gravitation-74727.png

  • Physics-Gravitation-74728.png
The earth (mass = 6 × 1024 kg) revolves round the sun with angular velocity 2 × 10–7 rad/s in a circular orbitof radius 1.5 × 108 km. The force exerted by the sun onthe earth in newtons, is
  • 18 × 1025
  • Zero
  • 27 × 1039
  • 36 × 1021
Gravitational mass is proportional to gravitational
  • Field
  • Force
  • Intensity
  • All of these
The distance of the centres of moon and earth is D. The mass of earth is 81 times the mass of the moon. At what distance from the centre of the earth, the gravitational force will be zero

  • Physics-Gravitation-74731.png
  • 2)
    Physics-Gravitation-74732.png

  • Physics-Gravitation-74733.png

  • Physics-Gravitation-74734.png
Who among the following gave first the experimental value of G?
  • Cavendish
  • Copernicus
  • Brook Teylor
  • None of these
The centripetal force acting on a satellite orbiting round the earth and the gravitational force of the earth acting on the satellite both equal F. The net force on the satellite is
  • Zero
  • F
  • F√2
  • 2F
Reason of weightlessness in a satellite is
  • Zero gravity
  • Centre of mass
  • Zero reaction force by satellite surface
  • None of the above
Mass M is divided into two parts xMand (1 – x)M. For agiven separation, the value of x for which the gravitational attraction between the two pieces becomes maximum is
  • 1/2
  • 3/5
  • 1
  • 2
The force of gravitation is
  • Repulsive
  • Electrostatic
  • Conservative
  • Non-conservative
Two point masses A and B having masses in the ratio4 : 3 are separated by a distance of 1 m. When another point mass C of mass M is placed in between A and B,the force between A and Cis 1/3rd of the force between B and C. Then the distance of C from A is

  • Physics-Gravitation-74741.png
  • 2)
    Physics-Gravitation-74742.png

  • Physics-Gravitation-74743.png

  • Physics-Gravitation-74744.png

  • Physics-Gravitation-74745.png
Three equal masses of 1 kg each are placed at the vertices of an equilateral triangle PQR and a mass of 2kg is placed at the centroid Oof the triangle which is at a distance of √2m from each of the vertices of the triangle. The force, in newton, acting on the mass of 2kg is
  • 2
  • √2
  • 1
  • Zero
0:0:1


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