Gravitation Test

Result

Gravitation Test - 3

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Question 1
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The ‘Law of Universal Gravitation’ states that every object of mass in the Universe attracts every other object of mass with a force which is __________ proportional to the product of their masses and inversely proportional to the _________ of the separation between their centers (Φ = No input required)

A
inversely, cube

B
directly, square

C
Φ, square

D
none of the above

Solution

The Law of Universal Gravitation states that every object of mass in the Universe attracts every other object of mass with a force which is directly proportional to the product of their masses and inversely proportional to the square of the separation between their centers.
Question 2
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The force of gravitation is,

A
Repulsive

B
Electrostatic

C
Conservative

D
Non-conservative

Solution

The force of gravitation is conservative nature i.e. a conservative force depends only on the position of the object. If a force is conservative, it is possible to assign a numerical value for the potential at any point.

A conservative force is a force with the property that the total work done in moving a particle between two points is independent of the taken path.
Question 3
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Which of the following statements about the gravitational constant is true,

A
It has no unit

B
It has same value in all systems of units

C
It depends on the value of the masses

D
It does not depend on the nature of the medium in which the bodies are kept.

Solution

The gravitational constant has a unit of N m²/Kg². Hence, option A is incorrect

The value of gravitational constant is different for different system of unit. In CGS system the value of gravitational constant is equal to 6.67 x 10^-8 dyne cm²/g². Thus option of B is also not correct.

The gravitational constant is independent of all the parameter and is constant throughout the universe. So, it does not depend on the mass of the body.

The gravitational constant does not depend on the nature of the medium. Therefore, this is an incorrect answer.