Q4 of 16 Page 35

Answer the following :

Mention three different effects produced by heat.

Effects of heat on a substance are:


(i) Change in the phase or the state of the substance.


For example boiling of water changes its state from liquid to vapours.


(ii) Change in colour.


Heating some elements can result in a change of colour like iron when heated changes its colour to red.


(iii) Change of shape of the substance.


A candle when burned, the wax will melt and the shape of the candle will change.


More from this chapter

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3

State whether the following statements are true or false:

1. Liquids expand on heating.


2. The unit of heat and temperature are the same.


3. A bimetallic strip is used in fans.

 4

Answer the following :

Distinguish between heat and temperature.

 4

Answer the following :

Give one example to illustrate that heat can be generated from the energy of motion.

 4

Answer the following :

Describe an experiment to show the change in state on heating.