Gravitation

The value of universal gravitation constant was first determined experimentally by

• Newton
• Galileo
• Cavendish
• Einstein

When the distance between the two objects is reduced to half, the force of gravitation become of the initial value.

• 1/2
• thrice
• ¼
• 4 times

Which law is it-“A planet revolves around the sun in an elliptical orbit’’?

• Newton’s first law
• Newton’s second law
• kepler’s first law
• kepler’s second law

Acceleration due to gravity on the moon is of that on the earth

• 1/6th
• 1/3rd
• 1/4th
• 1/5th

Gravitational force is a

• repulsive force
• attractive force
• neither (a) nor (b)
• both (a) and (b)

The weight of a body of mass 10kg is

• 98 N
• 9.8 N
• 69 N
• 39 N

The value of acceleration due to gravity of earth

• is the same equator and poles
• is the least on poles
• is the least on equator
• increase from pole to equator

Which is not a vector quantity?

• mass
• weight
• force
• acceleration

Inverse square law is also called

• kepler’s first law
• Newton’s second law
• Universal law
• ampere law

If R is the radius of the earth, the height at which the weight of a body becomes ¼ its weight on the surface of the earth is

• 2R
• R
• R/2
• R/4