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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 satellite is placed in orbit at a height equal to 7 times the Earth’s radius. If another satellite orbits at 4 times the Earth’s radius, what would be its orbital period?
(A) 6 hours
(B) 24 hours
(C) 18 hours
(D) 12 hours
Option d – 12 hours
Two satellites A and B have a Mass ratio of 4:1 and orbit at radii of 2r and 4r respectively. What is the ratio of their total mechanical energies?
(A) 8 : 1
(B) 6 : 1
(C) 10 : 1
(D) 4 : 1
Option a – 8 : 1
What is the approximate percentage decrease in gravity at a depth of 20 km below Earth’s surface? (Assume Earth’s radius is 6400 km)
(A) 0.75%
(B) 0.5%
(C) 0.25%
(D) 0.31%
Option d – 0.31%
Assertion: Gravity decreases from the poles to the equator.
Reason: The equator is farther from Earth’s center than the poles.
(A) Both assertion and reason are correct, and reason explains the assertion
(B) Both are correct, but reason is not the explanation
(C) Assertion is correct, but reason is incorrect
(D) Assertion is incorrect, but reason is correct
Option a – Both assertion and reason are correct, and reason explains the assertion
At which location is the value of acceleration due to gravity the greatest?
(A) Minimum
(B) Maximum
(C) Zero
(D) Infinite
Option b – Maximum
If two satellites with different masses orbit at the same radius, what can be said about their periods?
(A) Their time periods will match
(B) Their angular momenta will be equal
(C) Their kinetic energies will be identical
(D) Their potential energies will match
Option a – Their time periods will match
A 500g object weighs how much on a planet that has one-tenth Earth’s Mass and half its radius?
(A) 100g
(B) 800g
(C) 200g
(D) 400g
Option c – 200g
Why does the value of gravity decrease with altitude?
(A) Due to a reduction in gravitational pull
(B) Due to an increase in gravitational pull
(C) Due to decreased air density
(D) Due to increased air density
Option a – Due to a reduction in gravitational pull
A satellite orbits Earth in 6 hours. If its orbital distance is doubled, what is the new orbital period?
(A) 23 hours
(B) 17 hours
(C) 10 hours
(D) 20 hours
Option b – 17 hours
A satellite is moving in a circular orbit around Earth. Which of these statements is incorrect?
(A) It is in free fall
(B) It experiences an outward force countering gravity
(C) Its speed remains constant
(D) Its angular momentum stays unchanged
Option b – It experiences an outward force countering gravity
A geostationary satellite can be positioned
(A) Over any location along the equator
(B) Above the poles
(C) At a height equal to Earth’s radius
(D) At twice Earth’s radius above the surface
Option a – Over any location along the equator
What will be the velocity of a 5 kg object hitting Earth if it falls from infinity?
(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
Determine the escape velocity from a planet with Earth’s Mass but one-ninth its radius.
(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 Earth-Sun distance becomes one-fourth its current value, what happens to gravitational force between them?
(A) It becomes 8 times
(B) It becomes 16 times
(C) It becomes 32 times
(D) It becomes 4 times
Option b – It becomes 16 times
Identify the false statement about weightlessness in a satellite:
i. Weightlessness is due to no acceleration
ii. Weightlessness is due to zero normal force
iii. Weightlessness arises from balance between normal force and gravity
iv. Earth doesn’t pull objects in space
(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 masses 2M, m, and M are located at points P, Q, and R respectively. PQ is half of QR, and m is much smaller than M. Before any collisions occur, what will the Mass m do?
(A) Stay stationary
(B) Move towards M
(C) Move towards 2M
(D) Oscillate between the two
Option c – Move towards 2M
A satellite has an orbit radius six times greater than that of a Communication satellite. What is its orbital period?
(A) 25.68 days
(B) 20.14 days
(C) 14.69 days
(D) 10.38 days
Option c – 14.69 days
At what altitude will the gravitational acceleration become 25% of its surface value? (Earth’s radius = 6400 km)
(A) 2100 km
(B) 5200 km
(C) 3150 km
(D) 6400 km
Option d – 6400 km
Which statement is incorrect about how gravity changes?
(A) Gravity decreases as you move towards Earth’s center
(B) Gravity decreases with elevation
(C) Gravity decreases when moving from equator to poles
(D) Gravity decreases if Earth’s spin rate increases
Option c – Gravity decreases when moving from equator to poles
Which of the following is correct regarding a second’s pendulum in a satellite?
(A) Its time period becomes zero
(B) Its time period remains 1 second
(C) Its time period remains 2 seconds
(D) Its time period becomes infinite
Option d – Its time period becomes infinite
If the Earth-Sun distance becomes four times its current value, by how much does the gravitational attraction decrease?
(A) 94%
(B) 89%
(C) 60%
(D) 46%
Option a – 94%
If gravitational acceleration on a planet changes by 6%, how much does escape velocity change?
(A) 4%
(B) 6%
(C) 2%
(D) 3%
Option d – 3%
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