Sound — Science STD 9 — Question

Define connective tissue. Write down functions of connective tissue.

A sound producing body is at considerable distance from a man. There can be four different media W, X, Y and Z between the sound producing body and the man. The medium X brings the sound to man most quickly whereas medium Z takes the maximum time. The time taken by medium W in bringing sound to man is less than that of X but more than that of Z. The medium Y, however, fails to bring the sound from the sound producing body to the man. Which medium could be the one:

1. Having no fixed shape and no fixed volume?
2. Having a fixed volume but no fixed shape?
3. Having the same composition as that on the moon?
4. Having a fixed shape and a fixed volume?

Name two indigenous and two exotic breeds of poultry. Write a note on egg production and broiler production.

How is the power related to the speed at which a body can be lifted? How many kilograms will a man working at the power of 100W, be able to lift at constant speed of 1ms^-1 vertically? (g = 10ms^-2)

By which physical process the fragrance of burning an incense stick spreads all around?

State and explain Newton’s second law of motion.

With the help of a labelled diagram, describe the method of separating ammonium chloride from a mixture of ammonium chloride and common salt. Mention the difference in the properties of ammonium chloride and sodium chloride which has made this separations possible.

Write the differences between mass and weight of an object.

What is crystallisation? How can this technique be used to purify impure copper sulphate?