# Gravitation MCQ Questions for Class 11 Physics Chapter 8 with Answers

NCERTCOURSE.COM given here the NCERT chapter-wise Multiple Choice Questions from Class 11 Physics book Chapter 8 Gravitation with Answers Pdf free download. This may assist you to understand and check your knowledge about the chapters. Students also can take a free test of the Multiple Choice Questions of Gravitation. Each question has four options followed by the right answer. These MCQ Questions are selected supported by the newest exam pattern as announced by CBSE.

## Q1. The sky appears black to an astronaut in a spaceship. It is so because:

(i) surrounding medium absorbs sky light.
(ii) the region has only invisible part (UV and IR) of Sun light.
(iii) surrounding has no atmosphere.
(iv) none of the above.

(iii) surrounding has no atmosphere.

Q2. 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

(i) R
(ii) R/2
(iii) R/3
(iv) R/4

(iii) R/3

Q3. 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

(i) r²g / w
(ii) R²w²/ g
(iii) RG w²
(iv) R²g / w²

(iv) R²g / w²

## Q4. In planetary motion

(i) the total angular momentum remains constant
(ii) the linear speed remains constant
(iii) neither the angular momentum nor angular speed remains constant
(iv) the angular speed remains constant

(i) the total angular momentum remains constant

## Q5. Weightlessness experienced while orbiting the earth in spaceship, is the result of:

(i) zero gravity
(ii) centre of gravity
(iii) inertia
(iv) acceleration

(iv) acceleration

## Q6. Average density of the earth

(i) is a complex function of g
(ii) does not de end on g
(iii) is inversely proportional to g
(iv) is directly proportional to g

(ii) does not de end on g

## Q7. Who among the following first gave the experimental velocity of G?

(i) Cavendish
(ii) Copernicus
(iii) Brook Taylor
(iv) none of these

(i) Cavendish

(i) 129
(ii) 730
(iii) 182.5
(iv) 365

(i) 129

## Q9. The orbital speed of Jupiter is

(i) less than the orbital speed of Earth.
(ii) greater than the orbital speed of Earth.
(iii) equal to the orbital speed of Earth.
(iv) zero.

(i) less than the orbital speed of Earth.

Q10. 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

(i) 11.2 km/sec
(ii) 22.4 km/sec
(iii) 5.65 km/sec
(iv) 44.8 km/sec

(ii) 22.4 km/sec

## Q11. A missile is launched with a velocity less than the escape velocity. The sum of its kinetic and potential energy is

(i) Positive
(ii) Negative
(iii) Zero
(iv) may be positive or negative

(ii) Negative

## Q12. Force of gravitational attraction is least

(i) at the equator
(ii) at the poles
(iii) at a point in between equator and any pole
(iv) None of these

(i) at the equator

## Q13. Which of the following is the evidence to show that there must be a force acting on Earth directed towards the Sun.

(i) revolution of Earth around the Sun.
(ii) apparent motion of Sun around the Earth.
(iii) duration of falling bodies towards Earth.
(iv) phenomenon of day and night.

(i) revolution of Earth around the Sun.

## Q14. Geo-stationary satellite

(i) revolves about the polar axis
(ii) has a time period less than that of the earths satellite
(iii) moves faster than a near earth satellite
(iv) is stationary in the space

(i) revolves about the polar axis

## Q15. There is no atmosphere on the moon because

(i) it is closer to the earth
(ii) it revolves round the earth
(iii) it gets light from the sun
(iv) the escape velocity of gas molecules is less than their root mean square velocity here

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

## Q16. Where will it be profitable to purchase one kilogram sugar?

(i) At equator
(ii) At 40° latitude
(iii) At poles
(iv) At 45° latitude

(i) At equator

## Q17. A bail of weight W is thrown vertically upwards. The apparent w eight during the upward motion will be

(i) zero
(ii) more than W
(iii) less than W
(iv) W

(i) zero

Q18. 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

(i) r²g / w
(ii) R²w² / g
(iii) RG w²
(iv) R²g / w²

(iv) R²g / w²

(i) 2E0
(ii) E0
(iii) 1.5 E0
(iv) -E0

(i) 2E0

(i) 5 km
(ii) 15 km
(iii) 10 km
(iv) 20 km

(i) 5 km

## Q21. A projectle is fired with a velocity less than the escape velocity. What can we say about the sum of its potential and kinetic energies?

(i) Negative
(ii) Positive
(iii) Zero
(iv) May be +ve, -ve or zero

(i) Negative

(i) 24 hours
(ii) 6 hours
(iii) 12 hours
(iv) 48 hours

(i) 24 hours

## Q23. A body weighs 500 N on the surface of the earth. How much would it weight half way below the surface of the earth?

(i) 1000 N
(ii) 500 N
(iii) 250 N
(iv) 125 N

(iii) 250 N

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