466.  Which physical quantities have the same dimensions?

Answer & Explanation
Momentum and impulse

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

Answer & Explanation
Stagflation

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

Answer & Explanation
Hertz

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

Answer & Explanation
Roasting

470.  By which impact is Nuclear fission is caused?

Answer & Explanation
Neutron

471.  Comets revolve around which body?

Answer & Explanation
Sun

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

Answer & Explanation
Central core

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

Answer & Explanation
Due to the centrifugal force

474.  Sound travels faster in which thing?

Answer & Explanation
Iron than in air

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

Answer & Explanation
wind vane

476.  Why is 'Beaufort Scale' used?

Answer & Explanation
To measure wind velocity

477.  What denotes the smallest temperature?

Answer & Explanation
1 ° on the Kelvin scale

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

Answer & Explanation
-40 °
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