JEE Questions for Physics Gravitation Quiz 6 - MCQExams.com

A simple pendulum has a time period T1 when on the earth’s surface, and T2 when taken to a height R above the earth’s surface, where R is the radius of the earth.The value of T1/T2 is
  • 1
  • 2)
    Physics-Gravitation-74096.png
  • 3
  • 4
Energy required to move a body of mass m from an orbit of radius 2R to 3R is (where M = mass of earth, R = radius of earth)

  • Physics-Gravitation-74098.png
  • 2)
    Physics-Gravitation-74099.png

  • Physics-Gravitation-74100.png

  • Physics-Gravitation-74101.png
If W1, W2 and W3 represent the work done in moving a particle from A to B along three different paths 1, 2 and 3 respectively (as shown) in a gravitational field of point mass m, then
Physics-Gravitation-74103.png
  • W1 = W2 = W3
  • W1 > W2 > W3
  • W1 < W2 < W3
  • W1 < W3 < W2
Suppose the gravitational force varies inversely as the nth power of distance. Then, the time period of a planet in circular orbit of radius R around the sun will be proportional to

  • Physics-Gravitation-74104.png
  • 2)
    Physics-Gravitation-74105.png

  • Physics-Gravitation-74106.png

  • Physics-Gravitation-74107.png
The change in the value of ‘g’ at a height ‘h’ above the surface of the earth is the same as at a depth ‘d’ below the surface of earth. When both ‘d’ and ‘h’ are much smaller than the radius of earth, then which one of the following is correct ?
  • d = h
  • d = 2h

  • Physics-Gravitation-74109.png

  • Physics-Gravitation-74110.png
The correct graph representing the variation of total energy (ET), kinetic energy (EK) and potential energy (EP) of a satellite with its distance (r) from the centre of earth is

  • Physics-Gravitation-74112.png
  • 2)
    Physics-Gravitation-74113.png

  • Physics-Gravitation-74114.png

  • Physics-Gravitation-74115.png
Two identical solid copper spheres of radius R are placed in contact with each other. The gravitational force between them is proportional to

  • Physics-Gravitation-74117.png
  • 2)
    Physics-Gravitation-74118.png

  • Physics-Gravitation-74119.png

  • Physics-Gravitation-74120.png
The gravitational force Fg between two objects does not depend on
  • Sum of the masses
  • Product of masses
  • Gravitational constant
  • Distance between the masses
The atmosphere is held to the earth by
  • Clouds
  • Gravity
  • Winds
  • None of the above
Two sphere of mass m1 and m2 are situated in air and the gravitational force between them is F. The space around the masses is now filled with liquid of specific gravity 3. The gravitational force will now be
  • F
  • 3F
  • F/3
  • F/9
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.
Mass M is divided into two parts xM and (1 – x) M. For a given separation, the value of x for which the gravitational force between the two pieces becomes maximum is
  • 1
  • 2
  • 1/2
  • 4/5

Physics-Gravitation-74127.png

  • Physics-Gravitation-74128.png
  • Zero

  • Physics-Gravitation-74129.png

  • Physics-Gravitation-74130.png
Two particle of equal mass go round a circle of radius r. Under the action of their mutual gravitational force. The speed of each particle is =..................

  • Physics-Gravitation-74132.png
  • 2)
    Physics-Gravitation-74133.png

  • Physics-Gravitation-74134.png

  • Physics-Gravitation-74135.png
The distance of the moon and earth is D the mass of earth is 81 times the mass of moon. At what distance from the centre of the earth, the gravitational force will be zero
  • D/2
  • 12D/3
  • 4D/3
  • 9D/10
One can easily “ Weight the earth ” by calculating the mass of earth using the formula (in usual notation)

  • Physics-Gravitation-74138.png
  • 2)
    Physics-Gravitation-74139.png

  • Physics-Gravitation-74140.png

  • Physics-Gravitation-74141.png
Three equal masses of m kg each are placed the vertices of an equilateral triangle PQR and a mass of 2m kg is placed at the centroid 0 of the triangle which is at a distance of √2 m from each of vertices of triangle. The force in newton. acting on the mass 2m is = ............
  • 1
  • 2
  • √2
  • Zero
Which of the follwing statement about the gravitational constant is true
  • It is a force
  • It has no unit
  • It has same value in all system of unit
  • It depends on the value of the masses.
Two point masses A and B having masses in the ratio 4 : 3 are separated by a distance of lm. When another point mass c of mass M is placed in between A and B the forces A and C is 1/3rd of the force between band C, Then the distance C form A is = ............... m
  • 2/3
  • 1/3
  • 1/4
  • 2/7

Physics-Gravitation-74145.png
  • Depends on system of units only.
  • Depends on medium between masses only
  • Depends on both (a) and (b)
  • is independent of both (a) and (b)
In a gravitational field, at a point where the gravitational potential is zero
  • The gravitational field is necessarily zero
  • The gravitational field is not necessarily zero
  • Nothing can be said definitely, about the gravitational field
  • None of these

Physics-Gravitation-74147.png

  • Physics-Gravitation-74148.png
  • 2)
    Physics-Gravitation-74149.png

  • Physics-Gravitation-74150.png

  • Physics-Gravitation-74151.png
The masses and radii of earth and moon are M1, R1 and M2, R2 respectively. Their centres is d distance of apart ? The minimum velocity with which a particle of mass m should be projected From a point midway between their centres so that it escapes to infinity is...............

  • Physics-Gravitation-74153.png
  • 2)
    Physics-Gravitation-74154.png

  • Physics-Gravitation-74155.png

  • Physics-Gravitation-74156.png
A rocket is launched with velocity 10 kms–1. 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 center of spherical shell

  • Physics-Gravitation-74159.png
  • g
  • zero
  • None of these
Escape velocity of a body of 1 kg. on a planet is 100 ms–1. Gravitational potential energy of the body at the planet is =............... J
  • –5000
  • –1000
  • –2400
  • 5000
A body of mass m kg starts falling from a point 2R above the earth’s surface. Its K.E. when it has fallen to a point ‘R’ above the Earth’s surface = .....................[R - Radius of Earth, M - mass of Earth G - Gravitational constant]

  • Physics-Gravitation-74161.png
  • 2)
    Physics-Gravitation-74162.png

  • Physics-Gravitation-74163.png

  • Physics-Gravitation-74164.png
The Gravitational P.E. of a body of mas m at the earth’s surface is -mgRe. Its gravitational potential energy at a height Re from the earth’s surface will be = ............ here (Re is the radius of the earth)

  • Physics-Gravitation-74166.png
  • 2)
    Physics-Gravitation-74167.png

  • Physics-Gravitation-74168.png

  • Physics-Gravitation-74169.png
A body is projected vertically upwards from the surface of a planet of radius R with a velocity equal to half the escape velocity for that planet. The maximum height attained by the body is ..........
  • R/3
  • R/2
  • R/4
  • R/5
Energy required to move a body of mass m from an orbit of radius 2R to 3R is ................

  • Physics-Gravitation-74172.png
  • 2)
    Physics-Gravitation-74173.png

  • Physics-Gravitation-74174.png

  • Physics-Gravitation-74175.png
Radius of orbit of satellite of earth is R. Its K.E. is proportional to

  • Physics-Gravitation-74177.png
  • 2)
    Physics-Gravitation-74178.png
  • R

  • Physics-Gravitation-74179.png
A particle falls towards earth from infinity. It’s velocity reaching the earth would be.............
  • Infinity
  • 2)
    Physics-Gravitation-74181.png

  • Physics-Gravitation-74182.png
  • Zero
The escape velocity of a sphere of mass m from earth having mass M and Radius R is given by

  • Physics-Gravitation-74184.png
  • 2)
    Physics-Gravitation-74185.png

  • Physics-Gravitation-74186.png

  • Physics-Gravitation-74187.png
The escape velocity for a rocket from earth is 11.2 kms–1 value on a planet where acceleration due to gravity is double that on earth and diameter of the planet is twice that of earth will be = …….kms–1
  • 11.2
  • 22.4
  • 5.6
  • 53.6
The escape velocity from the earth is about 11 kms–1. The escape velocity from a planet having twice the radius and the same mean density as the earth is = ……… kms–1.
  • 22
  • 11
  • 5.5
  • 15.5
If g is the acceleration due to gravity at the earth’s surface and r is the radius of the earth, the escape velocity for the body to escape out of earth’s gravitational field is ……….
  • gr
  • 2)
    Physics-Gravitation-74190.png
  • g/r
  • r/g
The escape velocity of a projectile from the earth is approximately
  • 11.2 kms–1
  • 112 kms–1
  • 11.2 ms–1
  • 1120 kms–1
The escape velocity of a particle of mass m varies as ………….
  • m2
  • m
  • mo
  • m–1
The escape velocity of an object from the earth depends upon the mass of earth (M), its mean density (ρ), its radius (R) and gravitational constant (G), thus the formula for escape velocity is

  • Physics-Gravitation-74191.png
  • 2)
    Physics-Gravitation-74192.png

  • Physics-Gravitation-74193.png

  • Physics-Gravitation-74194.png
Two small and heavy sphere, each of mass M, are placed distance r apart on a horizontal surface the gravitational potential at a mid point on the line joining the centre of spheres is
  • Zero
  • 2)
    Physics-Gravitation-74195.png

  • Physics-Gravitation-74196.png

  • Physics-Gravitation-74197.png
The escape velocity of a body from earth’s surface is Ve. The escape velocity of the same body from a height equal to 7 R from earth’s surface will be

  • Physics-Gravitation-74199.png
  • 2)
    Physics-Gravitation-74200.png

  • Physics-Gravitation-74201.png

  • Physics-Gravitation-74202.png
An artificial satellite is revolving round the earth in a circular orbit. its velocity is half the escape velocity. Its height from the earth surface is = ............... km
  • 6400
  • 12800
  • 3200
  • 1600
The escape velocity of a planet having mass 6 times and radius 2 times as that of earth is..........

  • Physics-Gravitation-74205.png
  • 3 Ve

  • Physics-Gravitation-74206.png
  • 2 Ve
There are two planets, the ratio of radius of two planets is k but the acceleration due to gravity of both planets are g what will be the ratio of their escape velocity.

  • Physics-Gravitation-74208.png
  • 2)
    Physics-Gravitation-74209.png

  • Physics-Gravitation-74210.png

  • Physics-Gravitation-74211.png
The escape velocity of a body on the surface of the earth is 11.2 km/sec. If the mass of the earth is increases to twice its present value and the radius of the earth becomes half, the escape velocity becomes = ………..kms–1
  • 5.6
  • 11.2
  • 22.4
  • 494.8
3 particle each of mass m are kept at vertices of an equilateral triangle of side L. The gravitational field at centre due to these particles is ................
  • Zero
  • 2)
    Physics-Gravitation-74214.png

  • Physics-Gravitation-74215.png

  • Physics-Gravitation-74216.png

Physics-Gravitation-74218.png
  • 0.14
  • 0.5
  • 2.5
  • 5
Escape velocity on the surface of earth is 11.2 kms-1 Escape velocity from a planet whose masses the same as that of earth and radius 1/4 that of earth is = ....... kms–1
  • 2.8
  • 15.6
  • 22.4
  • 44.8
The velocity with which a projectile must be fired so that it escapes earth’s gravitational does not depend on ..................
  • Mass of earth
  • Mass of the projectile
  • Radius of the projectiles’s orbit
  • Gravitational constant
The escape velocity for a body projected vertically upwards from the surface of earth is 11kms–1 If the body is projected at an angle of 45o with the vertical, the escape velocity will be ............kms–1

  • Physics-Gravitation-74221.png
  • 2)
    Physics-Gravitation-74222.png
  • 22
  • 11
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Physics Quiz Questions and Answers