Who among the following anticipated Newton by declaring that all things gravitate to the earth?

If the distance between the Earth and the Sun were twice what it is now, the gravitational force exerted on the Earth by the Sun would be –

If the gravitational force of the earth suddenly disappears, which are of the following will be the correct consequence?

Which one among the following statements is not correct?

The acceleration due to gravity at the Earth’s surface depends on

The known forces of nature can be divided into four classes, viz, gravity, electromagnetism, weak nuclear force and strong nuclear force. With reference to them which one of the following statements…