Gravitation Test

Result

Gravitation Test - 5

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Question 1
1 / -0

The gravitational force with which the earth attracts the moon

A
is less than the force with which the moon attracts the earth

B
is equal to the force with which the moon attracts the earth

C
is greater than the force with which the moon attracts the earth

D
varies with the phases of the moon

Solution

Every force has an equal and opposite reaction. The gravitational force between any two objects is an attractive force, which pulls both objects closer to each other, which always acts on both the objects with the same magnitude. So, the force with which the earth attracts the moon towards itself, the moon attracts the earth towards itself with the same force.
Question 2
1 / -0

The tidal waves in the sea are primarily due to

A
gravitational effect of the moon on the earth

B
gravitational effect of the sun on the earth

C
gravitational effect of the sun and moon on the earth

D
gravitational effect of the earth on the sun

Solution

Moon is the heavenly body which is closest to the earth and the distance between earth and sun is 400 times more than the distance between earth and moon. That is why the tides are mainly caused by the gravitational effect of the moon on the earth.
Question 3
1 / -0

The weight of a body at the centre of earth is

A
zero

B
slightly more than that at the surface

C
slightly less than that at the surface

D
maximum

Solution

The weight of a body at the centre of earth is zero.
Question 4
1 / -0

If the force of gravity suddenly disappears,

A
the mass of all bodies will become zero

B
the weight of all bodies will become zero

C
both mass and weight of all bodies will become zero

D
neither mass nor weight of all bodies will become zero

Solution

Gravity is a natural phenomenon due to which all bodies attract each other with a force proportional to their masses. So, if the force is omitted, the bodies will remain where there are in space and will occupy no weight.