JEE Questions for Physics Gravitation Quiz 3 - MCQExams.com

The orbit of geostationary satellite is circular, the time period of satellite depends on
I. mass of the satellite
II. mass of the earth
III. radius of the orbit
IV. height of the satellite from the surface of earth
Which of the following is correct?
  • only I
  • I and II
  • I, II and III
  • II, III and IV
The time period of a geostationary satellite at a height 36000 km is 24 h. A sky satellite orbits earth at a height 6400 km. What will be the time period of sky satellite? (take, radius of the earth = 6400 km)
  • 5 h
  • 4 h
  • 3 h
  • 12 h
An artificial satellite is moving in a circular orbit around the earth with a speed equal to half the magnitude of escape velocity from the earth. The height of the satellite above the earth's surface will be
  • 6000 km
  • 5800 km
  • 7500 km
  • 6400 km
The satellite of mass m revolving in a circular orbit of radius r around the earth has kinetic energy E. Then, its angular momentum will be

  • Physics-Gravitation-73908.png
  • 2)
    Physics-Gravitation-73909.png

  • Physics-Gravitation-73910.png

  • Physics-Gravitation-73911.png
Three weights w, 2w and 3w are connected to identical spring suspended from a rigid horizontal rod. The assembly of the rod and the weights fall freely. The positions of the weight from the rod are such that
  • 3w will be farthest
  • w will be farthest
  • all will be at the same distance
  • 2w will be farthest
The time period of a satellite of the earth is 5 h. If the separation between the earth and the satellite is increased to 4 times the previous value, the new time period will become
  • 10 h
  • 80 h
  • 40 h
  • 20 h
A satellite is launched in a circular orbit of radius R around the earth. A second satellite is launched into an orbit of radius 1.01 R. The period of second satellite is longer than the first one (approximately) by
  • 1.5%
  • 0.5%
  • 3%
  • 1%
  • 2%
Astronaut is in a stable orbit around the earth when he weighs a body of mass 5 kg. What is reading of spring balance?
  • Spring will not be extended
  • Spring will be extended according to the Hooke's law
  • Less than 5 kg-wt
  • More than 5 kg-wt
A satellite moves in elliptical orbit about a planet. The maximum and minimum velocities of satellites are 3 × 10 4 ms -1 and 1 × 10 3 ms -1 , respectively. What is the minimum distance of satellite from planet, if maximum distance is 4 × 10 4 km?
  • 4 × 10 3 km
  • 3 × 10 3 km
  • 4/3 × 10 3 km
  • 1 × 10 3 km
A satellite of mass m revolves around the earth of radius R at a height x from its surface. If g is the acceleration due to gravity on the surface of the earth, the orbital speed of the satellite is
  • gx
  • 2)
    Physics-Gravitation-73912.png

  • Physics-Gravitation-73913.png

  • Physics-Gravitation-73914.png
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-73915.png
  • 2)
    Physics-Gravitation-73916.png

  • Physics-Gravitation-73917.png

  • Physics-Gravitation-73918.png
Kepler's second law states that the straight line joining the planet to the sun sweeps out equal areas in equal times. This statement is equivalent to saying that
  • total acceleration is zero
  • tangential acceleration is zero
  • longitudinal acceleration is zero
  • radial acceleration is zero
The binding energy of a satellite of mass m in a orbit of radius r is (R = radius of earth, g = acceleration due to gravity )

  • Physics-Gravitation-73919.png
  • 2)
    Physics-Gravitation-73920.png

  • Physics-Gravitation-73921.png

  • Physics-Gravitation-73922.png
A satellite moves in a circle around the earth. The radius of this circle is equal to one-half of the radius of the moon\'s orbit. The satellite completes one revolution in

  • Physics-Gravitation-73923.png
  • 2)
    Physics-Gravitation-73924.png

  • Physics-Gravitation-73925.png

  • Physics-Gravitation-73926.png
If suddenly the gravitational force of attraction between the earth and a satellite revolving around it becomes zero, then the satellite will
  • continue to move in its orbit with same velocity
  • move tangentially to the original orbit with the same velocity
  • become stationary in its orbit
  • move towards the earth
Gravitational attraction on Earth on the stone of mass M is FS. If the force on hydrogen balloon of mass M located at the same space is FB, then
  • FS > FB
  • FS < FB

  • Physics-Gravitation-73927.png

  • Physics-Gravitation-73928.png
If one moves from the surface of earth to moon, what will be the effect on its weight?
  • Weight of a person decreases continuously with height from the surface of earth
  • Weight of a person increases with height from the surface of earth
  • Weight of a person first decreases with height and then increases with height from the surface of earth
  • Weight of a person first increases with height and then decreases with height from the surface of earth.
For a body to escape from earth, angle at which it should be fired is
  • 45o
  • > 45o
  • < 45o and
  • any angle
To an astronaut in a space ship, the sky appears pitch dark because of
  • the absence of atmosphere in his neighbourhood.
  • light from the sky is absorbed by the medium surrounding him.
  • the fact that at height radiations are only in the infrared and the ultraviolet range.
  • the fact that the human eye becomes blind for the blue colour.
The earth moves around the sun in an elliptical orbit as shown in the fig. The ratio. OA/OB = x. The ratio of the speed of the earth at B and at A is
Physics-Gravitation-73929.png

  • Physics-Gravitation-73930.png
  • x
  • x2

  • Physics-Gravitation-73931.png
A jet engine works on the principle of
  • conservation of mass
  • conservation of energy
  • conservation of linear momentum
  • conservation of angular momentum
The mass of the moon is about 1.2% of the mass of the earth. Compared to the gravitational force the earth exerts on the moon, the gravitational force the moon exerts on earth
  • is the same
  • is smaller
  • is greater
  • varies with its phase
The time period of a satellite of earth is 5 hours. If the separation between the earth and the satellite is increased to 4 times the previous value, the new time period will become
  • 40 hours
  • 20 hours
  • 10 hours
  • 80 hours
The curves for potential energy (EP) and kinetic energy (EK) of two particles system are shown in fig. At what points the system will be bound
  • only at point A
  • only at point D
  • at points A and D
  • at points A, B and C
As we go from the equator to the poles, the value of g ...............
  • Remains constant
  • Decreases
  • Increases
  • Decreases upro latitude of 45o
If R is the radius of the earth and g the acceleration due to gravity on the earth’s surface, the mean density of the earth is = ...............
  • 4πG/3gR
  • 3πR/4gG
  • 3g/4πRG
  • πRG/12g
The radius of the earth is 6400 km and g=10ms-2. In order that a body of 5 kg weights zero at the equator, the angular speed of the earth is = ............... rad/sec
  • 1/80
  • 1/400
  • 1/800
  • 1/600
The time period of a simple pendulum on a freely moving artificial satellite is ............... sec
  • 0
  • 2
  • 3
  • Infinite
A spherical planet far out in space has mas Mo and diameter Do. A particle of m falling near the surface of this planet will experience an acceleration due to gravity which is equal to
  • GMo/Do2
  • 4mGMo/Do2
  • 4GMo/Do2
  • GmMo/Do2
A body weights 700 g wt on the surface of earth How much it weight on the surface of planet whose mass is 1/7 and radius is half that of the earth
  • 200g ωt
  • 400g ωt
  • 50 g ωt
  • 300g ωt
The value of g on he earth surface is 980 cm/sec2 . Its value at a height of 64 km from the earth surface is ............... cm5–2
  • 960.40
  • 984.90
  • 982.45
  • 977.55
If earth rotates faster than its present speed the weight of an object will.
  • increases at the equator but remain unchanged of the poles.
  • Decreases at the equator but remain unchanged at poles.
  • Remain unchanged at the equator but decreases at poles.
  • Remain unchanged at the equator but increases at the poles.
The moon’s radius is 1/4 that of earth and its mass is 1/80 times that of the earth. If g represents the acceleration due to gravity on the surface of earth, that on the surface of the moon is ..............
  • g/8
  • g/4
  • g/5
  • g/6
If the density of smalll planet is that of the same as that of the earth while the radius of the planet is 0.2 times that of lthe earth, the gravitational acceleration on the surface of the planet is ...............
  • 0.2g
  • 0.4g
  • 2g
  • 4g
If mass of a body is M on the earth surface, than the mass of the same body on the moon surface is
  • M/6
  • 56
  • M
  • None of these
If the radius of earth is R then height ‘h’ at which value of ‘g’ becomes one - fourth is
  • R/4
  • 3R/4
  • R
  • R/8
If the mass of earth is 80 times of that of a planet and diameter is double that of planet and ‘g’ on the earth is 9.8 ms-2 , then the value of ‘g’ on that planet is = ............... ms-2
  • 4.9
  • 0.98
  • 0.49
  • 49
Assuming earth to be a sphere of a uniform density, what is value of gravitational acceleration in mine 100 km below the earth surface = ............... ms-2
  • 9.66
  • 7.64
  • 5.00
  • 3.1
A body weight 500 N on the surface of the earth. How much would it weight half way below the surface of earth
  • 125N
  • 250N
  • 500N
  • 1000N
Weight of a body is maximum at
  • moon
  • poles of earth
  • Equator of earth
  • Center of earth
At what distance from the center of earth, the value of aceeleration due to gravity g will be half that of the surfaces (R = Radius of earth)
  • 2R
  • R
  • 1.414 R
  • 0.414 R
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
The acceleration due to gravity is g at a point distance r from the center of earth R. if r < R then
  • g α r
  • g α r2
  • g α r-2
  • g α r-1
Density of the earth is doubled keeping its radius constant then acceleration, due to gravity will be .................. ms-2(g = 9.8 ms2)
  • 19.6
  • 9.8
  • 4.9
  • 2.45
Weight of body of mass m decreases by 1% when it is raised to height h above the earth’s surface. If the body is taken to a depth h in a mine. change in its weight is
  • 2% decreases
  • 0.5% decreases
  • 1% increases
  • 0.5% increases
If density of earth increased 4 times and its radius becomes half of then out weight will be ......
  • Four times it present calue
  • doubled
  • Remain same
  • halved
A man can jump to a height of 1.5 m on a planet A what is the height ne may be able to jump on another planet whose density and radius are respectively one- quater and one- third that of planet A
  • 1.5 m
  • 15 m
  • 18 m
  • 28 m
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 earth)
  • g/9
  • g/3
  • g/4
  • 9
The height at which the weight of a body becomes 1/16 th its weight on the surface of (radius R) is
  • 3R
  • 4R
  • 5R
  • 15R
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
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Physics Quiz Questions and Answers