Physics MCQ

A body weighs 49 N on a spring balance at the north pole. What will be its weight recorded on

the same weighing machine, if it is shifted to the equator?

[Use g=9.8m/s^2 and radius of earth R=6400km

• 49 N

• 49.83 N

• 49.17 N

• 48.83 N

If the mass of the Sun were ten times smaller and

the universal gravitational constant were ten times

larger in magnitude, which of the following is not

correct?

• Raindrops will fall faster.

• Walking on the ground would become more

  difficult

• Time period of a simple pendulum on the Earth

  would decrease.

• g on the Earth will not change.

The radius of earth is about 6400 km and that of

mars is 3200 km. The mass of the earth is about 10

times mass of mars. An object weighs 200 N on the

surface of earth. Its weight on the surface of mars

will be

• 20 N

• 8 N

• 80 N

• 40 N

A body weighs 72 N on the surface of the earth.

What is the gravitational force on it, at a height equal

to half the radius of the earth?

• 48 N

• 32 N

• 30 N

• 24 N

A body weighs 200 N on the surface of the earth.

How much will it weigh half way down to the centre

of the earth?

• 100 N

• 150 N

• 200 N

• 250 N

The acceleration due to gravity at a height 1 km

above the earth is the same as at a depth d below the

surface of earth. Then d =

• 1 km

• 1.5 km

• 2 km

• 0.5 km

Two astronauts are floating in gravitational free

space after having lost contact with their spaceship.

The two will

• move towards each other

• move away from each other

• will become stationary

• keep floating at the same distance between

  them.

The SI unit of gravitational constant G is

• Nmkg-2

• Nm2kg-2

• Nm2kg-1

• Nmkg-1

The value of gravitational constant G depends upon

• the masses of the bodies

• the sizes of the bodies

• the separation of the bodies

• none of the above quantities