List three characteristics of particles of matter.Describe one example for each characteristic to illustrate it.Name the characteristics which are responsible for (a) spreading of smell of scent in a room and (b) water taking shape of the vessel in which poured.

4

(a)

State one important characteristics of matter which makes it a solid, a liquid or a gas? Explain

4

(a)

Ice and water are essentially the same substance?Mention any two differences in their properties.

4

(a)

What is pressure?What is its unit?On what factor does the pressure of a gas depend?

4

(a)

How does the b. pt. of a liquid vary with pressure? Explain.

4

(a)

Heat becomes unbearable in summer, especially after rain.Why?

4

(a)

Is it true to say that fluorescent tube contains plasma?Explain.

4

(a)

Why do the sun or the stars glow?

4

(a)

What are important properties of cathode rays?

4

(a)

What is the specific function of cardiac muscle?

4

(a)

What is non-uniform motion? Give some examples.

4

(a)

Define the terms time period and frequency of an oscillating body. Give their units and write the relation between them.

4

(a)

State and explain in brief the four major factors, which cause disease.

4

(a)

Is it necessary to replenish forests?

4

(a)

What prevantive and control measures should be taken before storage of grains?

4

(a)