The ratio of inertial mass and gravitational mass has been found to be $1$ for all material bodies. Were this ratio different for different bodies, the two bodies having same gravitational mass but different inertial mass would have?

Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason $R$.

Assertion $A$: If we move from poles to equator, the direction of acceleration due to gravity of earth always points towards the center of earth without any variation in its magnitude.

Reason $R $: At equator, the direction of acceleration due to the gravity is towards the center of earth. In the light of above statements, choose the correct answer from the options given below

If mass of a body is $M$ on the earth surface, then the mass of the same body on the moon surface is

The international space station is maintained in a nearly circular orbit with a mean altitude of $330 \,km$ and a maximum of $410 \,km$. An astronaut is floating in the space station's cabin. The acceleration of astronaut as measured from the earth is

If the earth rotates faster than its present speed, the weight of an object will

A body weighs $250\,N$ on the surface of the earth. ....... $N$ will it weigh half way down to the centre of the earth .