# MCQs for Physics Class 11 with Answers Chapter 8 Gravitation

Students of class 11 Physics should refer to MCQ Questions Class 11 Physics Gravitation with answers provided here which is an important chapter in Class 11 Physics NCERT textbook. These MCQ for Class 11 Physics with Answers have been prepared based on the latest CBSE and NCERT syllabus and examination guidelines for Class 11 Physics. The following MCQs can help you to practice and get better marks in the upcoming class 11 Physics examination

## Chapter 8 Gravitation MCQ with Answers Class 11 Physics

MCQ Questions Class 11 Physics Gravitation provided below have been prepared by expert teachers of grade 11. These objective questions with solutions are expected to come in the upcoming Standard 11 examinations. Learn the below provided MCQ questions to get better marks in examinations.

Question. When the planet comes nearer the sun moves
(a) fast
(b) slow
(c) constant at every point
(d) none of the above

A

Question. The escape velocity of a body from the surface of the earth is v. It is given a velocity twice this velocity on the surface of the earth. What will be its velocity at infinity?
(a) v
(b) 2v
(c) √2v
(d) √3v

D

Question. Keplers second law regarding constancy of arial velocity of a planet is a consequence of the law of conservation of
(a) energy
(b) angular momentum
(c) linear momentum
(d) none of these

B

Question. The period of geostationary artificial satellite is
(a) 24 hours
(b) 6 hours
(c) 12 hours
(d) 48 hours

A

Question. If the distance between the earth and the sun were half its present value , the number of day in a year would have been
(a) 64.5
(b) 129
(c) 182.5
(d) 730

B

Question. The mean radius of the earth is R, its angular speed on its own axis is w and the acceleration due to gravity at earths surface is g. The cube of the radius of the orbit of a geo-stationary satellite will be
(a) r²g / w
(b) R²w² / g
(c) RG w²
(d) R²g / w²

D

Question. The escape velocity for a body projected vertically upwards from the surface of the earth is 11km/s. If the body is projected at an angle of 45° 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

Question. If escape velocity from the earths surface is 11.2 km/sec. then escape velocity from a planet of mass same as that of earth but radius one fourth as that of earth is
(a) 11.2 km/sec
(b) 22.4 km/sec
(c) 5.65 km/sec
(d) 44.8 km/sec

B

Question. Geo-stationary satellite
(a) revolves about the polar axis
(b) has a time period less than that of the earths satellite
(c) moves faster than a near earth satellite
(d) is stationary in the space

A

Question. If the radius of the earth were to be rease by 1% its mass remaining the same, the acceleration due to gravity on the surface of the earth will
(a) increase by 1%
(b) decrease by 2%
(c) decrease by 1%
(d) increase by 2%

D

Question. The radii of the earth and the moon are in the ratio 10 : 1 while acceleration due to gravity on the earths surface and moons surface are in the ratio 6 : 1. The ratio of escape velocities from earths surface to that of moon surface is
(a) 10 : 1
(b) 6 : 1
(c) 1.66 : 1
(d) 7.74 : 1

D

Question. An infinite number of identical point masses each equal to m are placed at points x = 1, x = 2, x = 4, x = 8m, ……. The total gravitational potential at point at x = 0 is
(a) -Gm
(b) -2Gm
(c) +2Gm
(d) infinite

B

Question. If the radius of the earth were to shrink by 1% its mass remaining the same, the acceleration due to gravity on the earths surface would
(a) decrease by 2%(b) remain unchanged
(c) increase by 2%
(d) will increase by 9.8%

C

Question. 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

Question. Average density of the earth
(a) is a complex function of g
(b) does not de end on g
(c) is inversely proportional to g
(d) is directly proportional to g

B

Question. A satellite is revolving around the earth in a circular orbit with a velocity of 7.07 km/s. What minimum increase in its velocity is needed to make it escape gravitational pull of earth?
(a) 4.23 km/s in the direction of its velocity
(b) 11.3 km/s in a direction perpendicular to its velocity
(c) 2.93 km/s in the direction of its velocity
(d) 4.23 km/s in a direction perpendicular to its velocity