Question

4. When water boils and is converted into steam, then ................... .

(a) heat is taken in and temperature remains constant.

(b) heat is taken in and temperatures rises.

(c) heat is given out and temperatures lowers.

(d) heat is given out and temperature remains constant.


5. With reference to the above diagram,

which of the following relation

is incorrect?

(a) cIron > c

copper

(b) c

copper

> clead

(c) cIron > clead

(d) clead > c

copper

Answer 1

4. (d) is the correct answer.

Answer 2

Answer:

when water boils and is converted into steam, then heat is given out and temperature remains constant.

Explanation:

When water boils and is converted into steam, then heat is given out and temperature remains constant.

This heat is called Latent heat or heat of vaporisation.

The water molecules give up heat and release more steam and the temperature is constant at 100 C.