Gravitation Test

Result

Gravitation Test - 3

Score
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Rank
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TIME Taken - -

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Weekly Quiz Competition

Question 1
1 / -0

Escape velocity from the earth,

A
Changes with time

B
Does not depend on the direction of projection

C
Depends on mass of Earth

D
May change from point to point

Solution

Escape velocity is independent of the direction of projection but depends on the mass of Earth and distance of projection from the center of Earth.

The correct answer is: May change from point to point, Does not depend on the direction of projection, Depends on mass of Earth
Question 2
1 / -0

Change in potential energy of a point mass if left free to itself, with time,

A
may be positive

B
may be negative

C
must be zero

D
may be zero

Solution

Change in potential energy, with time, of a point mass if left free to itself, may be zero (point mass on horizontal surface) or negative (point mass falling freely vertically) .

The correct answer is: may be zero, may be negative
Question 3
1 / -0

A geo-stationary satellite orbits around the earth in a circular orbit of radius 36,000 km. Time period of a satellite orbiting a few hundred kms above the Earth’s surface (R_earth = 6,400 km) will approximately be

A
4hr

B
2hr

C
1 hr

D
1/2 hr

Solution

A satellite revolving near the earth's surface has a time period of 84.6 min.

As height increases, the time period increases. So the time period of the satellite should be slightly greater than 84.6 minutes.

The correct answer is: 2hr