# MCQ for Class 11 Physics Chapter 8 Gravitation with answer

MCQ for Class 11 Physics Chapter 8 : MCQs for Class 11 Physics Chapter 8 Gravitation with Answers PDF Free Download prepared here according to the latest CBSE RBSE and Other State Board syllabus and NCERT Books.

## MCQ for Class 11 Physics Chapter 8 Chapter 8 Gravitation with answer

Q1. The radius of the earth is 6400 km and g = 10 m/s². In order that a body of 5 kg weighs zero at the equator, the angular speed of the earth is

Q2. A body weighs 500 N on the surface of the earth. How much would it weight half way below the surface of the earth?

(a) 1000 N
(b) 500 N
(c) 250 N
(d) 125 N

(c) 250 N

Q3. The time – period of a satellite of earth is 5 hours. If the separation between the earth and the satellite is increased to 4 times the previous value, the new time – period will become

(a) 10 hours
(b) 20 hours
(c) 40 hours
(d) 80 hours

(c) 40 hours

Q4. A missile is launched with a velocity less than the escape velocity. The sum of its kinetic and potential energy is

(a) Positive
(b) Negative
(c) Zero
(d) may be positive or negative

(b) Negative

Q5. What would be the duration of the year if the distance between the earth and the sun gets doubled?

(a) 1032 days
(b) 129 days
(c) 365 days
(d) 730 days

(a) 1032 days

Q6. If a body of mass m is taken out from a point below the surface of earth equal to half the radius of earth, R, to a height R above the earths surface, then work done on it will be

(a) (5/6) mgR
(b) (6/7) mgR
(c) (7/8) mgR
(d) (8/9) mgR

(c) (7/8) mgR

Q7. A artificial satellite moving in a circular orbit around the earth has a total (kinetic + potential) energy E0. Its potential energy is

(a) 2E0
(b) E0
(c) 1.5 E0
(d) -E0

(a) 2E0

Q8. A body is projected vertically from the surface of the earth of radius R with velocity equal to half of the escape velocity. The maximum height reached by the body is

(a) R
(b) R/2
(c) R/3
(d) R/4

(c) R/3

Q9. The escape velocity for a body projected vertically upwards from the surface of the earth is 11 km/s. If the body is projected at an angle of 450 with the vertical, the escape velocity will be

(a) 11/√2 km/s
(b) 11√2 km/s
(c) 2 km/s
(d) 11 km/s

(d) 11 km/s

Q10. There is no atmosphere on the moon because

(a) it is closer to the earth
(b) it revolves round the earth
(c) it gets light from the sun
(d) the escape velocity of gas molecules is less than their root mean square velocity here

(d) the escape velocity of gas molecules is less than their root mean square velocity here

Q11. The value of g at a particular point is 9.8 m/sec² suppose the earth suddenly shrink uniformly to half its present size without losing any mass. The value of g at the same point (assuming that the distance of the point from the centre of the earth does not shrink) will become

(a) 9.8 m/sec²
(b) 4.9 m/sec²
(c) 19.6 m/sec²
(d) 2.45 m/sec²

(a) 9.8 m/sec²

Q12. Kepler’s second law may be stated as “under the influence of central force, in equal interval of time, position vector sweeps out equal

a) area
b) None of these
c) distance
d) dispalacement

a) area

Q13. If the distance of earth is halved from the sun, then the no. of days in a year will be

a) 129
b) 730
c) 182.5
d) 365

a) 129

Q14. If the earth is at one-fourth of its present distance from the sun, the duration of the year will be

a) one-eighth the present year
b) one-sixth the present year
c) one-tenth the present year
d) half the present year

a) one-eighth the present year

Q15. 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

a) both small and big bodies

Q16. The value of G varies with

a) None of these
c) depth below the ground
d) height above the earth’s surface

a) None of these

Q17. 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

a) at the equator

Q18. 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

a) Assertion is correct, reason is incorrect

Q19. 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

a) 9 R

Q20. 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

a) 17

Q21. Where will it be profitable to purchase one kilogram sugar?

a) At equator
b) At 40° latitude
c) At poles
d) At 45° latitude

a) At equator

Q22. 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

a) the centrifugal force is more at the equator than at the poles

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