A 150 m long train is moving with a constant velocity of 45 kilometre/hour. The time taken by this train to cross a bridge of length 850 m is:

Atmospheric pressure is equal to:

Select the correct equation for pressure.

Which of the following elements have got their names from colour? (i) Chlorine (ii) Chromium (iii) Curium (iv) Polonium

Match the changes in physical states in column A with the name of the corresponding process in column B: (i) liquid to gas (ii) solid to liquid (iii) solid to gas (iv) gas to solid, matched with (a) condensation (b) vaporisation (c) melting (d) sublimation.