10th science Refresher Course 6-Heat answer key

10th science Refresher Course 6-Heat answer key

EVALUATION

I. Choose the correct answer

1. Calorie is the unit of a

a. heat

b. work

c. temperature

d. food

2. SI unit of temperature is

a. Fahrenheit

b. joule

c. celsius

d. kelvin

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3. In which mode of transfer of heat, molecules pass on heat energy to neighbouring molecules without actually moving from their positions?

a. Radiation

b. Conduction

c. Convection

d. Both b and c.

II. Fill in the blanks

1. The fastest mode of heat transfer is ________

2. During day time, air blows from _________ to _________

3. Liquids and gases are generally conductors of heat ____________

4. The fixed temperature at which matter changes state from solid to liquid is called ______

III. Answer briefly

1. Define conduction.

2. Ice is kept in a double-walled container. Why?

3. How does the water kept in an earthen pot remain cool?

4. Differentiate convection and radiation.

5. Why do people prefer wearing white clothes during summer?

6. What is specific heat capacity?