466.  Which physical quantities have the same dimensions?

467.  What is the situation with increasing unemployment and inflation termed?

468.  Who firstly demonstrated experimentally the existence of electromagnetic wave?

469.  Heating pyrites in air to remove sulphur is known as which name?

470.  By which impact is Nuclear fission is caused?

471.  Comets revolve around which body?

472.  Which layer of the earth is believed to have the heaviest mineral materials of highest density?

473.  When milk is churned, how does the cream separate from it?

474.  Sound travels faster in which thing?

475.  Which instrument used for finding out wind-direction?

476.  Why is 'Beaufort Scale' used?

477.  What denotes the smallest temperature?

478.  A temperature at which both the Fahrenheit and the centigrade scales have the same value?