Consider the following statements: Statement I: In the context of effect of water on rocks, chalk is known as a very permeable rock whereas clay is known as quite an impermeable or least permeable rock. Statement II: Chalk is porous and hence can absorb water. Statement III: Clay is not at all porous. Which one of the following is correct in respect of the above statements?

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…

Which one among the following statements is not correct?

Consider the following statements: I. Without the atmosphere, temperature would be well below freezing point everywhere on the Earth's surface. II. Heat absorbed and trapped by the atmosphere maintai…

Which one of the following statements is true ?

Satellites used for telecommunication relay are kept in a geostationary orbit. A satellite is said to he in such an orbit when : 1. The orbit is geosynchronous. 2. The orbit is circular. 3. The orbit…