Gravitation Test

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Gravitation Test - 1

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Question 1
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Gravity is a conservative force. Which of the following is incorrect about this force?

A
Force always points towards a certain point in space.

B
The work done on moving a particle from one point to another doesn't depend on path.

C
Mechanical energy remains constant.

D
Kinetic energy of a system under the influence of gravity remains constant.

Solution

Kinetic energy depends upon the speed and mass of the body. More massive objects would have more kinetic energy than other objects of the same mass.
Question 2
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Ball pens function on the principle of

A
viscosity

B
capillarity

C
gravity

D
atmospheric pressure

Solution

Ball pens function on the principle of gravity. Fountain pens function on the principle of capillarity and gravity.
Question 3
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As we go from the equator to the poles, the value of g

A
remains the same

B
decreases

C
increases

D
decreases up to a latitude of 45° and then increases

Solution

The value of 'g' is minimum at the equator and maximum at the poles.

It means 'g' increases as we go from the equator towards the poles.

This is due to the diference in the the radius of the earth, which is greater at the equator than at the poles due to slight bulge in the earth at the equator and slight flattening of it at the poles.
Question 4
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The path of an object released from earth at a velocity less than escape velocity and more than orbital velocity is called

A
circular

B
incomplete Elliptical

C
parabolic

D
hyperbolic

Solution

The path of an object released from earth at a velocity less than escape velocity and more than orbital velocity is called incomplete Elliptical.
Question 5
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Escape velocity from earth is approximately

A
11.2 km/s

B
11.2m/s

C
11.2 km/h

D
11.2m/h

Solution

It is the least velocity required to throw a body away from the surface of the earth so that it may not return.

Escape velocity from the earth is approximately 11.2 km/s.