In This Post we are providing Chapter-8 Gravitation NCERT MCQ for Class 11 Physics which will be beneficial for students. These solutions are updated according to 2021-22 syllabus. These MCQS can be really helpful in the preparation of Board exams and will provide you with a brief knowledge of the chapter.
NCERT MCQ ON GRAVITATION
Question 1: Newton’s universal law of gravitation applies to
- a) both small and big bodies
- b) only valid for solar system
- c) planets only
- d) small bodies only
Answer: both small and big bodies
Question 2: The value of G varies with
- a) None of these
- b) radius of the planet
- c) depth below the ground
- d) height above the earth’s surface
Answer: None of these
Question 3: Force of gravitational attraction is least
- a) at the equator
- b) at the poles
- c) at a point in between equator and any pole
- d) None of these
Answer: at the equator
Question 4:
Assertion : If earth suddenly stops rotating about its axis, then the value of acceleration due to gravity will become same at all the places.
Reason : The value of acceleration due to gravity depends upon the rotation of the earth.
- a) Assertion is correct, reason is incorrect
- b) Assertion is incorrect, reason is correct
- c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
- d) Assertion is correct, reason is correct; reason is a correct explanation for assertion
Answer: Assertion is correct, reason is incorrect
Question 5: The height of the point vertically above the earth’s surface, at which acceleration due to gravity becomes 1% of its value at the earth’s surface is (Radius of the earth = R)
- a) 9 R
- b) 10 R
- c) 20 R
- d) 8 R
Answer: 9 R
Question 6: The speed of earth’s rotation about its axis is w. Its speed is increases to x times to make the effective acceleration due to gravity equal to zero at the equator. Then x is
- a) 17
- b) 34
- c) 8.5
- d) 1
Answer: 17
Question 7: Where will it be profitable to purchase one kilogram sugar?
- a) At equator
- b) At 40° latitude
- c) At poles
- d) At 45° latitude
Answer: At equator
Question 8: Earth is flattened at poles, bulged at the equator. This is due to
- a) the centrifugal force is more at the equator than at the poles
- b) the angular velocity of spinning about its axis is more at equator
- c) the angular velocity of spinning about its axis is less at equator
- d) earth revolves round the sun in an elliptical orbit
Answer: the centrifugal force is more at the equator than at the poles
Question 9: A particle is suspended from a spring and it stretches the spring by 1 cm on the surface of earth. By how much amount the same particle will stretch the same spring at a place 800 km above the surface of earth.
- a) 0.79 cm
- b) 1.38 cm
- c) 2.38 cm
- d) 1.59 cm
Answer: 0.79 cm
Question 10: Average density of the earth
- a) is directly proportional to g
- b) is inversely proportional to g
- c) does not depend on g
- d) is a complex function of g
Answer: is directly proportional to g
Question 11: If the earth were to rotates faster than its present speed, the weight of an object will
- a) decrease at the equator but remain unchanged at the poles
- b) remain unchanged at the equator but decrease at the poles
- c) remain unchanged at the equator but increase at the poles
- d) increase at the equator but remain unchanged at the poles
Answer: decrease at the equator but remain unchanged at the poles
Question 12: At what height from the ground will the value of g be the same as that in 10 km deep mine below the surface of earth?
- a) 5 km
- b) 15 km
- c) 10 km
- d) 20 km
Answer: 5 km
Question 13: The ratio of radii of earth to another planet is 2/3 and the ratio of their mean densities is 4/5. If an astronaut can jump to a maximum height of 1.5 m on the earth, with the same effort, the maximum height he can jump on the planet is
- a) 0.8 m
- b) 0.5 m
- c) 1.25 m
- d) 1 m
Answer: 0.8 m
Question 14: 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 measured by
- a) each decreases at different rates
- b) each decreases at the same rate
- c) B goes on decreasing and that by A goes on increasing
- d) A goes on decreasing and that by B goes on increasing
Answer: each decreases at different rates
Question 15: In some region, the gravitational field is zero. The gravitational potential in this region.
- a) must be constant
- b) must be zero
- c) must be variable
- d) cannot be zero
Answer: must be constant
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