Gravitation Test

Result

Gravitation Test - 39

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Weekly Quiz Competition

Question 1
4 / -1

If the height of a satellite from the earth is negligible in comparison of the radius of the earth R, the orbital velocity of the satellite is ...........

A
gR

B
gR/2

C

D
Question 2
4 / -1

A satellite is moving around the earth with speed v in a circular orbit of radius r. If the orbit radius is decreased by 1% its speed will

A
Increase by 1%

B
Increase by 0.5%

C
Decrease by 1%

D
Decrease by 0.5%

Solution
Question 3
4 / -1

Orbital velocity of an artifiicial satellite does not depend upon

A
Mass of earth

B
Mass of satellite

C
Radius of earth

D
Acceleration due to gravity

Solution
Question 4
4 / -1

Orbital velocity of earth’s satellite near the surface is 7 kms^–1. when the radius of orbit is 4 times that of earth’s radius, then orbital velocity in that orbit is = ………kms^–1

A
3.5

B
17

C
14

D
35

Solution
Question 5
4 / -1

Two identical satellites are at R and 7R away from each surface, the wrong statement is (R - Radius of earth)

A
Ratio of total energy will be 4

B
Ratio of kinetic energies will be 4

C
Ratio of potential energies will be 4

D
Ratio of total energy will be 4 but ratio of potential and kinetic energies will be 2

Solution
Question 6
4 / -1

Which one of following sttements regarding artificial satellite of earth is incorrect

A
The orbital velocity depends on the mass of the satellite

B
A minimum velocity of 8kms^–1is required by a satellite to orbit quite close to the earth

C
The period of revolution is large if the radius of its orbit is large

D
The height of geostationary satellite is about 36000 km from earth
Question 7
4 / -1

The weight of an astronuat, in an artificial satellite revolving around the earth is

A
Zero

B
Equal to that on the earth

C
More than that on earth

D
less than that on the earth
Question 8
4 / -1

The distance of a geo-stationary satellite from the centre of the earth (Radius R = 6400km) is nearest to

A
5R

B
7R

C
10R

D
18R
Question 9
4 / -1

A geo-stationary satellite is orbiting the earth of a height of 6R above the surface of earth, R being the radius of earth. The time period of another satellite at a height of 2.5 R from the surface fo earth is = ...............hr

A
6

B

C
10

D

Solution
Question 10
4 / -1

A

B

C

D

Solution