CLASS VII
WORKSHEET (HEAT AND TEMPERATURE)

I. Look at the fig. and explain the three modes of heat transfer.
II Fill in the blanks-

1.Solids ____________ on heating and ____________ on cooling.

2.Among matter _________ expands the most and _______ the least.

3.Two bodies are said to be in the state of thermal ____________ if

there is no transfer of heat taking place.

4.Liquids and gases are generally ____________ conductors of heat.

5.Ocean current are caused by the setting up of __________ in water.

6.During night time cool breeze blows from _________ to ________.

7.____________ and ____________ are good conductors of heat.

8.Transfer of heat takes place from a body at __________ temperature

to a body at ____________ temperature.

9.Transfer of heat may take place by either ___________, _________

or ____________.

10.Black surfaces are better __________ of heat than polished surfaces.

11.Heat is a form of ____________.

12.The fixed temperature at which matter is in a liquid state changes to

its solid state is called ____________.

13.Temperature is a measure of ____________ of a body.

14.Increase in size of the object when heated is called _________.

 15.Thermal expansion is maximum in ____________.

16.Temperature is the degree of ____________ of a body.

17.Heating of metals is through the mechanism of ____________.

18.Heat from the sun reaches us through the mode of ____________.

19.Land and sea breezes are caused by ____________ currents.

III.The statements given below are incorrect. Write the correct

statements.

1.The heat coming from the sun travels by convection.

2.More is the heating, less is the expansion of solids

3.Air conducts heat.

4.People prefer wearing black clothes in summer.