  Gravitation

Quiz by REGI JOSEPH

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Correct quiz answers unlock more play!  20 questions
• Q1

The masses of two planets are in the ratio 1 : 2. Their radii are in the ratio 1 : 2. The acceleration due to gravity on the planets are in the ratio.

5:3

3;5

2;1

1;2

300s
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• Q2

If the radius of the earth is made three times, keeping the mass constant, then the weight of a body on the earth's surface will be as compared to its previous value is

one third

three times

one ninth

nine times

300s
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• Q3

Two satellites of mass m and 9m are orbiting a planet in orbits of radius R. The period of revolution  will be in the ratio of

1:1

9:1

1:3

3:1

300s
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• Q4

If the density of Earth is doubled keeping its radius constant then acceleration due to gravity will become (the present value is 9,8 ms-2)

2.45

4.9 ms-2

19.6 ms-2

9.8 ms-2

300s
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• Q5

A satellite is orbiting around the Earth with a period T. If the Earth suddenly shrinks to half its radius without change in mass, the period of revolution of the satellite will be

2T

T/2

T

T√2

300s
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• Q6

Two satellites of mass m, and 10m, are put in the same orbit around the sun. If T1 and T2 be their time periods, then T1/T2 =

1/2

1/4

1

4

300s
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• Q7

The escape velocity will ……………… if a planet is made bigger keeping its density constant.

remains the same

decrease

none of the above

increase

300s
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• Q8

Tell which of the following statements will be True about the observation given here? If the gravitational attraction of Earth suddenly disappears, then(a) Both mass as well as the weight will be zero.(b) Weight of the body will become zero but the mass will remain unchanged.(c) Weight of the body will remain unchanged but the mass will become zero.(d) Neither mass nor weight will be zero

Neither mass nor weight will be zero

Weight of the body will remain unchanged but the mass will become zero

Weight of the body will become zero but the mass will remain unchanged.

Both mass as well as the weight will be zero.

300s
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• Q9

Tell which of the following statements are False?(a) A spaceship entering Earth’s atmosphere is likely to catch fire.(b) ve > v0 for Earth.(c) A surface at every point of which the gravitational potential remains same is called equipotential surface.(d) g at pole is lesser than at the equator.

ve > v0 for Earth.

Escape velocity  doesnot depend on mass of the body

A spaceship entering Earth’s atmosphere is likely to catch fire.

g at pole is lesser than at the equator.

30s
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• Q10

The picture shows three objects gravitationally interacting with each other. Which object exerts the greatest force on object B? Object B

A and C exert an equal force on B

Cannot be determined

Object C

300s
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• Q11

Which graph shows the correct variation of g with height and depth , where r0 is the radius of the Earth? C

B

A

D

300s
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• Q12

Two stationary particles of masses M1 and M2 are at distance d apart. A third particle, lying on the linejoining the particles, experiences no resultant gravitational force. Thedistance of this particle from M1 is A

C

B

D

300s
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• Q13

The time period (T) of the artificial satellite of Earth depends on the density (p) of the Earth as

T ∝ 1/ρ

T ∝ √ρ

T ∝ ρ

T ∝ 1√ρ

300s
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• Q14

A body is taken from the poles to the equator of the earth, what happens to its weight?

remains the same

decreases

becomes 0

increases

300s
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• Q15

A rocket is fired from the earth towards the sun. At what distance from the earth’s centre is the gravitational force on the rocket zero? Mass of the sun = 2 x 1030 kg, mass of the earth = 6 x 1024 kg. Neglect the effect of other planets etc. (orbital radius = 1.5 x 1011 m).

2.6x10 8 km

0.26x10 8 m

2.6x10 7 m

2.6x10 8 m

300s
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• Q16

An artificial  satellite revolves round the earth in a circular orbit with a speed v.If m is the mass of the satellite ,its total energy is

-1/2 mv2

1.5 mv2

mv2

1/2 mv2

300s
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• Q17

The velocity with which an object revolves around a massive body is known as

Differential Velocity

escape velocity

none of the option

orbital velocity

300s
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• Q18

The relation between escape velocity and orbital velocity is given as

Ve=√2Vo

Vo=√2Ve

Ve=Vo/2

Ve=2Vo

300s
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• Q19

The earth rotates about the sun in an elliptical orbit. At which point will its velocity be maximum? C

B

A

D

300s
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• Q20

Force of attraction  between two bodies each of unit mass placed unit distance

6.67x10 -11N/m

6.67x10 11N

6.67x10 10N

6.67x10 -11N

300s
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