Gravitation Test

Result

Gravitation Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

Two bodies of mass 2 m and 3 m are approaching each other at velocity 4v and 5v respectively. After a while their velocities become 6v and 7v respectively. What is the total change in potential energy?

A
56

B
16

C
20

D
36
Question 2
1 / -0

What causes tides?

(i) Attraction of sun
(ii) Attraction of moon
(iii) Attraction of earth

A
(i) & (iii)

B
(ii) & (iii)

C
(i) & (ii)

D
Only (i)

Solution

Tides are the periodic rises and falls of large bodies of water. Tides are caused by the gravitational interaction between the earth and the moon. The gravitational attraction of the moon causes the oceans to bulge out in the direction of the moon.
Question 3
1 / -0

The mass of a satellite increases by a factor of two. The orbital velocity

A
becomes twice

B
becomes thrice

C
remains unchanged

D
insufficient informatiom

Solution

As the orbital velocity is independent of the mass of the satellite, so the orbital velocity will remain the same.
Question 4
1 / -0

Which of the following statements are true?
(i) Orbital velocity is more than escape velocity.
(ii) Escape velocity is √2 times the orbital velocity.
(iii) Orbital velocity increases with radius.
(iv) A body with a velocity equal to the orbital velocity will orbit the planet in a circular path.

A
(i) & (ii)

B
(ii) & (iv)

C
(iii) & (ii)

D
(iii) & (iv)

Solution

Escape velocity is √2 times the orbital velocity. A body with a velocity equal to the orbital velocity will orbit the planet in a circular path.