Matter in Our Surroundings — Science STD 9 — Question

State the general name of the waves on which the particles of the medium vibrate:
In the same direction as wave.

Name the scientist who explained the motion of planets on the basis of gravitational force between the sun and planets.

Name the physical quantity whose unit is watt.

What is the unit of force?

Which of the following substances are elements?
Water, Salt, Mercury, Iron, Marble, Diamond, Wood, Nitrogen, Air, Graphite, Hydrogen, Oxygen, Sugar, Chlorine

Name the force which makes heavy objects appear light when immersed in a liquid.

What is the name of passage in outer ear which carries sound waves to the ear-drum?

Define the following terms:
Freezing

Name a metal:
Which is yellow in colour.

Name the laws involved in the following situation:
if there were no friction and no air resistance, then a moving bicycle would go on moving for ever.