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mcq on Gravitation. We covered all the mcq on Gravitation in this post for free so that you can practice well for the exam.
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mcq on Gravitation for Students
If the escape velocity from Earth is 4u, what would it be from a planet having twice the Earth’s Mass and twice its radius?
a) 3u
b) 8u
c) u
d) 4u
Option c – u
A body with Mass m ascends to a height equal to R/5 above the Earth’s surface. Given g as the gravitational acceleration at Earth’s surface, what is the increase in potential energy?
a) (5/6) mgh
b) (6/7) mgh
c) mgh
d) none of above
Option a – (5/6) mgh
The eccentricity of Earth’s orbit is 0.0167. What is the ratio of its highest orbital speed to its lowest?
a) 3.033
b) 1.000
c) 2.666
d) 1.033
Option d – 1.033
A 2 kg object is subject to a central force with potential energy described by U(r) = 2r³. If it’s in a circular orbit with a radius of 5 m, what is its energy?
a) 625 Joules
b) 250 Joules
c) 325 Joules
d) 500 Joules
Option a – 625 Joules
Which physical principle explains Kepler’s second law, stating that a planet sweeps equal areas in equal time?
a) angular momentum
b) energy
c) linear momentum
d) none of above
Option a – angular momentum
Among the following, which object has the lowest moment of inertia?
a) Sphere
b) Ring
c) Cylinder
d) none of above
Option a – Sphere
What happens to the value of gravitational acceleration ‘g’ as altitude increases above Earth’s surface?
a) decreases
b) increases
c) constant
d) none of above
Option a – decreases
Four masses, each of Mass m, are positioned at the corners of a square with side L. What is the gravitational force on a fifth Mass m at the center?
a) Zero
b) 1N L
c) -1N
d) 2N
Option a – Zero
If Earth’s diameter doubles while keeping its Mass the same, how is the surface weight of an object affected?
a) Reduced to half its original value
b) Reduced to one-fourth its original value
c) Reduced to one-fifth its original value
d) Remains unchanged
Option b – Reduced to one-fourth its original value
What happens to an object’s weight when moved from the equator to the pole?
a) It decreases
b) It increases
c) It remains unchanged
d) None
Option b – It increases
What is the ratio of inertial Mass to gravitational Mass?
a) 2
b) 3
c) 4
d) 1
Option d – 1
At a height equal to Earth’s radius above the surface, what is the value of gravitational acceleration?
a) g/2
b) g/5
c) g/4
d) g/6
Option c – g/4
What is the time period of a simple pendulum in a satellite orbiting Earth?
a) infinite
b) T
c) zero
d) 2T
Option a – infinite
If a satellite orbits a planet and the planet’s Mass is suddenly halved, what will the satellite do?
a) Orbit the planet at a lower speed
b) Maintain the same speed in orbit
c) Escape from the planet
d) Fall toward the planet
Option a – Orbit the planet at a lower speed
How do two air bubbles behave when submerged in water?
a) Attract each other
b) Repel each other
c) No interaction
d) none of above
Option a – Attract each other
Two nearby celestial bodies, S₁ and S₂, are seen moving in orbits. What best describes their motion?
a) Around a common center of Mass
b) S₁ remains still while S₂ moves
c) S₁ remains stationary while S₂ orbits around it
d) Move in arbitrary paths
Option a – Around a common center of Mass
One satellite orbits Earth at a radius R, and another at radius 1.01R. By what approximate percentage is the second satellite’s period longer?
a) 1%
b) 0.77%
c) 1.5%
d) 2%
Option c – 1.5%
If the gravitational effect was weaker, which of the following forces would most likely be affected?
a) Archimedes’ buoyant force
b) Viscous force
c) Electrostatic force
d) none of above
Option a – Archimedes’ buoyant force
What is the orbital period of a geostationary satellite?
a) 34 hours
b) 24 hours
c) 256 hours
d) none of above
Option b – 24 hours
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