MCQ of Gravitation Class 9. We covered all the MCQ of Gravitation Class 9 in this post for free so that you can practice well for the exam.
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MCQ on Gravitation for Students
Consider Earth to be a homogeneous sphere. Scientist A goes deep down in a mine and scientist B goes high up in a balloon. The gravitational field is measured by
(a) A goes on decreasing and that B goes on increasing
(b) B goes on decreasing and that A goes on increasing
(c) each decreases at the same rate
(d) each decreases at different rates
Option d – each decreases at different rates
The free-fall acceleration g increases as one proceeds, at sea level, from the equator toward either pole. The reason is
(a) Earth is a sphere with the same density everywhere
(b) Earth is a sphere with different density in the polar regions than in the equatorial regions
(c) Earth is approximately an ellipsoid having its equatorial radius greater than its polar radius by 21 km
(d) Earth is approximately an ellipsoid having its equatorial radius smaller than its polar by 21 km
Option c – Earth is approximately an ellipsoid having its equatorial radius greater than its polar radius by 21 km
Which one of the following statements about gravitational force is NOT correct?
(a) It is experienced by all bodies in the universe
(b) It is a dominant force between celestial bodies
(c) It is a negligible force for atoms
(d) It is the same for all pairs of bodies in our universe
Option d – It is the same for all pairs of bodies in our universe
An artificial satellite orbiting the earth does not fall down because the earth’s attraction
(a) is balanced by the attraction of the moon
(b) vanishes at such distances
(c) is balanced by the viscous drag produced by the atmosphere
(d) produces the necessary acceleration of its motion in a curved path
Option d – produces the necessary acceleration of its motion in a curved path
A ball is dropped from a satellite revolving around the earth at a height of 120 km. The ball will
(a) continue to move with the same speed along a straight line tangentially to the satellite at that time
(b) continue to move with the same speed along the original orbit of the satellite
(c) fall down to earth gradually
(d) go far away in space
Option b – continue to move with the same speed along the original orbit of the satellite
If an apple is released from an orbiting spaceship, it will
(a) fall towards the Earth
(b) move at a lower speed
(c) move along with the spaceship at the same speed
(d) move at a higher speed
Option c – move along with the spaceship at the same speed
If the earth were to rotate faster than its present speed, the weight of an object will
(a) increase at the equator but remain unchanged at the poles
(b) decrease at the equator but remain unchanged at the poles
(c) remain unchanged at the equator but decrease at the poles
(d) remain unchanged at the equator but increase at the poles
Option b – decrease at the equator but remain unchanged at the poles
The weight of an object in the coal mine, at sea level, and at the top of the mountain, are respectively W₁, W₂, and W3 then
(a) W₁ < W₂ > W3
(b) W₁= W₂ = W3
(c) W₁ < W₂> W3
(d) W₁ > W₂ > W3
Option a – W₁ W3
If suddenly the gravitational force of attraction between the earth and a satellite revolving around it becomes zero, then the satellite will
(a) continue to move in its orbit with the same velocity
(b) move tangentially to the original orbit in the same velocity
(c) become stationary in its orbit
(d) move towards the earth
Option b – move tangentially to the original orbit in the same velocity
An artificial satellite orbiting the earth does not fall down because the earth’s attraction
(a) is balanced by the attraction of the moon
(b) vanishes at such distances
(c) is balanced by the viscous drag produced by the atmosphere
(d) produces the necessary acceleration of its motion in a curved path
Option d – produces the necessary acceleration of its motion in a curved path
The relay satellite transmits the TV program continuously from one part of the world to another because its
(a) the period is greater than the period of rotation of the earth
(b) the period is less than the period of rotation of the earth about its axis
(c) the period has no relation with the period of the earth about its axis
(d) the period is equal to the period of rotation of the earth about its axis
Option d – the period is equal to the period of rotation of the earth about its axis
Geo-stationary satellite is one which
(a) remains stationary at a fixed height from the earth’s surface
(b) revolves like other satellites but in the opposite direction of earth’s rotation
(c) revolves around the earth at a suitable height with the same angular velocity and in the same direction as the earth does about its own axis
(d) None of these
Option c – revolves around the earth at a suitable height with the same angular velocity and in the same direction as the earth does about its own axis
We covered all the MCQ of gravitation class 9 above in this post for free so that you can practice well for the exam.
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