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Physical and chemical changes

Describe how crystals of copper sulphate are prepared.

Mensuration

In question, state whether the statement are true (T) or false (F).

The areas of any two faces of a cube are equal.

Physical and chemical changes

Explain why burning of wood and cutting it into small pieces are
considered as two different types of changes.

Mensuration

Two cylinders of same volume have their radii in the ratio 1:6, then
ratio of their heights is __________.

Mensuration

Two cylinders of same volume have their radii in the ratio 1:6, then
ratio of their heights is __________.

Physical and chemical changes

How would you show that setting of curd is a chemical change?

Mensuration

Two cylinders of equal volume have heights in the ratio 1:9. The
ratio of their radii is __________.

Mensuration

__________ surface area of room = area of 4 walls.

Mensuration

__________ of a solid is the measurement of the space occupied by it.

Physical and chemical changes

When a candle burns, both physical and chemical changes take place.
Identify these changes. Give another example of a familiar process in
which both the chemical and physical changes take place.