What do you mean by diffusion? Explain giving an example.

3

(a)

If you open a bottle of perfume in one corner of a room, it immediately spreads throughout the room.State and explain the property involved.

3

(a)

How does the meaning of pure substance different for a common man that to a chemist? Explain.

3

(a)

Define the term compound.

3

(a)

If the molar mass of carbon is 12g, what is the mass of one atom of carbon in gram?

3

(a)

A radioisotope has half-life of 900 seconds.Calculate the fraction of original isotope which would remain behind after four half-life periods.

3

(a)

Differentiate between bone and cartilage.

3

(a)

Deduce the expression for the distance travelled by a body moving with uniform acceleration in a given time.

3

(a)

If the distance between two masses beincreased by a factor of 6, by what factor would the mass of one of them have to be altered to maintain the same gravitational force? Would this be an increase or decrease in mass?

3

(a)

A light and a heavy object have the same momentum.Find out the ratio of their kinetic energies.Which one has a large kinetic energy?

3

(a)

What are immediate cause and contributory cause of disease?

3

(a)

What is "greenhouse effect'? What would be its effect? name two greenhouses gases.

3

(a)

How do plants get their nutrients?

3

(a)

Enlist various methods of weed control.

3

(a)

Name the indigenous and exotic varieties of honey bees used for commercial production of honey.

3

(a)