Which one of the following statements is true ?

Which one among the following statements is not correct?

Which one of the following is correctly matched ?

Which one of the following gases is minimum in the atmosphere?

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…

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