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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
Imagine Earth as a uniform sphere. Scientist A descends into a mine while Scientist B ascends in a hot-air balloon. What happens to the gravitational field measured by each?
(a) A experiences a decrease while B observes an increase
(b) B experiences a decrease while A observes an increase
(c) Both measurements decrease at the same rate
(d) Both measurements decrease, but at different rates
Option d – Both measurements decrease, but at different rates
As one moves from the equator towards the poles at sea level, the acceleration due to gravity increases. What explains this?
(a) Earth is a sphere with uniform density throughout
(b) The density near the poles is greater than at the equator
(c) Earth is shaped like an ellipsoid, with the equatorial radius about 21 km longer than the polar radius
(d) Earth is shaped like an ellipsoid, but its equatorial radius is about 21 km shorter than the polar radius
Option c – Earth is shaped like an ellipsoid, with the equatorial radius about 21 km longer than the polar radius
Which of the following statements about gravitational force is incorrect?
(a) It acts on all Matter in the universe
(b) It is the dominant force acting between celestial objects
(c) It has minimal effect at atomic scales
(d) It is identical for all pairs of objects in the universe
Option d – It is identical for all pairs of objects in the universe
Why doesn’t an artificial satellite fall toward the Earth?
(a) The moon’s gravity cancels Earth’s pull
(b) Earth’s gravitational pull disappears at that distance
(c) Atmospheric drag counteracts gravity
(d) Gravity provides the required centripetal force for its curved path
Option d – Gravity provides the required centripetal force for its curved path
A ball is dropped from a satellite orbiting the Earth at an altitude of 120 km. What will happen to the ball?
(a) It will continue in a straight-line path tangential to the satellite’s motion
(b) It will maintain the same velocity and follow the satellite’s orbit
(c) It will slowly descend towards Earth
(d) It will drift farther away into space
Option b – It will maintain the same velocity and follow the satellite’s orbit
When an apple is let go inside a spaceship orbiting the Earth, it will
(a) Fall towards the Earth
(b) Move with a slower speed
(c) Stay in motion alongside the spaceship at the same speed
(d) Move faster than the spaceship
Option c – Stay in motion alongside the spaceship at the same speed
If the Earth began rotating faster than its current speed, how would an object’s weight be affected?
(a) It would increase at the equator but remain unchanged at the poles
(b) It would decrease at the equator but remain unchanged at the poles
(c) It would remain unchanged at the equator but decrease at the poles
(d) It would remain unchanged at the equator but increase at the poles
Option b – It would decrease at the equator but remain unchanged at the poles
Suppose the weight of an object is measured in a coal mine, at sea level, and on top of a mountain as W₁, W₂, and W₃ respectively. Which of the following is true?
(a) W₁ < W₂ > W₃
(b) W₁ = W₂ = W₃
(c) W₁ < W₂ > W₃
(d) W₁ > W₂ > W₃
Option a – W₁ < W₂ > W₃
If the gravitational pull between the Earth and a satellite suddenly became zero, the satellite would
(a) Keep orbiting the Earth with the same speed
(b) Move in a straight line tangential to its previous orbit with the same speed
(c) Stop and remain fixed in its orbit
(d) Fall towards Earth
Option b – Move in a straight line tangential to its previous orbit with the same speed
Why doesn’t an artificial satellite orbiting Earth fall back to the surface?
(a) Because the Moon’s gravity neutralizes Earth’s gravity
(b) Because Earth’s gravity becomes zero at high altitudes
(c) Because of atmospheric drag opposing gravity
(d) Because gravity keeps it in its curved path by providing necessary acceleration
Option d – Because gravity keeps it in its curved path by providing necessary acceleration
A relay satellite enables continuous TV broadcasting from one region of the world to another because
(a) Its orbital period exceeds Earth’s rotation period
(b) Its orbital period is less than Earth’s rotational period
(c) Its period does not relate to Earth’s rotation
(d) Its period matches the Earth’s rotation around its axis
Option d – Its period matches the Earth’s rotation around its axis
What defines a geo-stationary satellite?
(a) It remains fixed at a specific height above Earth’s surface
(b) It orbits the Earth in the opposite direction of Earth’s rotation
(c) It orbits Earth at a specific height, matching Earth’s rotational speed and direction
(d) None of the above
Option c – It orbits Earth at a specific height, matching Earth’s rotational speed and direction
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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