Q3 of 16 Page 35

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.

1. The statement is true.


Any liquid on heating will expand because the molecules of the liquid will gain kinetic energy from the heat and the collisions between the molecules increases due to increased vibrations of the molecule. Due to all this, the volume of the liquids will increase and they expand.


2. The statement is False.


SI unit of temperature is Celsius while the SI unit of heat is Joule.


3. The statement is False.


Bimetallic strips have two different metals with different expansion coefficient they are commonly used in switches and thermostats.


More from this chapter

All 16 →
1

A and B are two objects. The temperature of A is greater than that of B. This means that

 2

Fill in the blanks with suitable words:

1. The degree of hotness of a body is called_______ (heat/ temperature)


2. Temperature is expressed in_______(degree centigrade/joule)


3. A substance changes from liquid to gas at constant temperature.


It is called _______(condensation/boiling point)


4. The temperature of boiling water in the Celsius scale of temperature is ________°C (100/373/212/32)


5. The SI unit of heat is _________(Joule/Celsius)

 4

Answer the following :

Distinguish between heat and temperature.

 4

Answer the following :

Mention three different effects produced by heat.