Gravitation MCQ Class 9. We covered all the Gravitation MCQ Class 9 in this post for free so that you can practice well for the exam.
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MCQ on Gravitation for NEET Students
A geostationary satellite is at a height of 7R above the surface of the earth, R being the radius of the earth. The time period of another satellite in hours at a height of 4R from the surface of the earth is
(A) 6 hours
(B) 24 hours
(C) 18 hours
(D) 12 hours
Option d – 12 hours
Find the ratio of total mechanical energy of two satellites A and B having a ratio of masses as 4 : 1 and are moving in circular orbits of radii 2r and 4r respectively.
(A) 8 : 1
(B) 6 : 1
(C) 10 : 1
(D) 4 : 1
Option a – 8 : 1
The percentage decrease in the acceleration due to gravity at a depth of 20 km below the surface of the earth is (R = 6400 km)
(A) 0.75%
(B) 0.5%
(C) 0.25%
(D) 0.31%
Option d – 0.31%
Assertion: The acceleration due to gravity ‘g’ decreases as we go from the poles to the equator on the surface of the earth. Reason: The distance of an object on the surface of the earth is more from the center of the earth at the equator as compared to the pole.
(A) The assertion is True, Reason is True; Reason is a correct explanation for Assertion.
(B) The assertion is True, and Reason is True; Reason is not a correct explanation for Assertion.
(C) The assertion is True, Reason is False.
(D) The assertion is False, Reason is True.
Option a – The assertion is True, Reason is True; Reason is a correct explanation for Assertion.
At the surface of the earth, the value of g is ………
(A) minimum
(B) maximum
(C) zero
(D) infinity
Option b – maximum
If two satellites having different masses are put in the same orbit, then there
(A) time periods will be the same.
(B) angular momentum will be the same.
(C) kinetic energies will be the same.
(D) potential energies will be the same.
Option a – time periods will be the same.
A body weighs 500g on the surface of the earth. How much will it weigh on the surface of a planet whose mass is 1/10 and whose radius is half that of the earth?
(A) 100g
(B) 800g
(C) 200g
(D) 400g
Option c – 200g
The acceleration due to gravity decreases as we go above the surface of the earth because
(A) the gravitational force decreases.
(B) gravitational force increases.
(C) the density of air decreases.
(D) the density of air increases.
Option a – the gravitational force decreases.
The time period of a satellite on earth is 6 hours. If the separation between the earth and the satellite is increased to two times the previous value, the new time period will become
(A) 23 hours
(B) 17 hours
(C) 10 hours
(D) 20 hours
Option b – 17 hours
Consider a satellite going around the earth in a circular orbit. Which of the following statements is WRONG?
(A) It is a freely falling body.
(B) It is acted upon by a force directed away from the center of the earth which counterbalances the gravitational pull.
(C) It is moving at a constant speed.
(D) Its angular momentum remains constant.
Option b – It is acted upon by a force directed away from the center of the earth which counterbalances the gravitational pull.
A geostationary satellite can be installed
(A) over any city on the equator.
(B) over the north or south pole.
(C) at height R above the earth.
(D) at the height 2R above the earth.
Option a – over any city on the equator.
What will be the velocity of a 5 kg body at the earth’s surface, if it is dropped from an infinite height towards the earth?
(A) 5.4 km/s
(B) 9.8 km/s
(C) 11.2 km/s
(D) 14.6 km/s
Option c – 11.2 km/s
Find the escape velocity of a planet where mass is the same as that of earth and radius is 1/9 that of earth.
(A) 33.6 km/s
(B) 64.8 km/s
(C) 43.6 km/s
(D) 16.4 km/s
Option a – 33.6 km/s
If the distance between Sun and Earth is made one-fourth times the present value, then the gravitational force between them will become
(A) 8 times
(B) 16 times
(C) 32 times
(D) 4 times
Option b – 16 times
Which of the following statements is false? i. The person sitting on a chair in a satellite feels weightless because the person in the satellite is not accelerated. ii. The person sitting on a chair in a satellite feels weightless because the normal force on him is zero. iii. The person sitting in a chair in a satellite feels weightless because the normal force of the chair on the person balances the earth’s attraction. iv. The person sitting on a chair in a satellite feels weightless because the earth does not attract the object in a satellite.
(A) i, iii and iv
(B) i, ii and iii
(C) ii, iii and iv
(D) i, ii and iv
Option a – i, iii and iv
Three particles of masses 2M, m, and M are respectively at points P, Q, and R with PQ = 1/2 (QR), m is significantly smaller than M, and at time t = 0, they are all at rest. At subsequent times before any collision takes place, particles of mass m will
(A) remain at rest.
(B) move towards M.
(C) moves towards 2M.
(D) have oscillatory motion.
Option c – moves towards 2M.
Find the period of revolution of a satellite (S) having an orbit of radius 6 times that of a communication satellite (C).
(A) 25.68 days
(B) 20.14 days
(C) 14.69 days
(D) 10.38 days
Option c – 14.69 days
Find the height at which the value of g is 25% of its value on the surface of the earth (R = 6400 km)
(A) 2100 km
(B) 5200 km
(C) 3150 km
(D) 6400 km
Option d – 6400 km
Select the WRONG statement: The acceleration due to gravity ‘g’ decreases if
(A) we go down from the surface of the earth towards its center.
(B) we go up from the surface of the earth.
(C) we go from the equator to the poles on the surface of the earth.
(D) the rotational velocity of the earth is increased.
Option c – we go from the equator to the poles on the surface of the earth.
Which of the following statement is true? ( Gravitation MCQ Class 9 )
(A) The time period of a second’s pendulum in a satellite is zero.
(B) The time period of a second’s pendulum in a satellite is 1s.
(C) The time period of a second’s pendulum in a satellite is 2 s.
(D) The time period of a second’s pendulum in a satellite is infinity.
Option d – The time period of a second’s pendulum in a satellite is infinity.
If the distance between the Sun and the earth is made four times, then attraction between the two will decrease by
(A) 94%
(B) 89%
(C) 60%
(D) 46%
Option a – 94%
What will be the change in escape velocity on a planet if its acceleration due to gravity changes by 6% of its original?
(A) 4%
(B) 6%
(C) 2%
(D) 3%
Option d – 3%
We covered all the gravitation MCQ class 9 above in this post for free so that you can practice well for the exam.
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