Sound — Science STD 9 — Question

Name the three tiny bones present in the middle part of ear.

What is the physical state of water:
at 0°C?

What is the most common way of expressing the concentration of a solution?

Name one property of liquids and gases which tells us that their molecules are moving constantly.

State one instance where water undergoes a physical change and one in which it undergoes a chemical change.

Name one pair of substances whose mixture can be separated completely by distillation.

Which force is responsible for holding the solar system together?

What name is given to this number?

How much work is done by the gravitational force of earth acting on a satellite moving around it in a circular path? Give reason for your answer.

Name that part of ear which vibrates when outside sound falls on it.