Page 54 - Science Class 6 Times Publication

Main Points to Remember

1. Heat is a form of energy which brings sensation of warmth.

2. The sun, fuels, electricity, friction, combustion of food, etc are
the sources of heat.

3. Heat can cause
i) rise in temperature.
ii) expansion of an object
iii) change in state of matter
4. Black and rough substances are good absorbers of heat.

5. Heat is used for cooking food, keeping our body warm, running
vehicles, running factories, drying clothes and food grains, etc.

6. The degree of hotness or coldness of an object is called
temperature.
7. A device which measures temperature of a body is thermometer.

Exercise

1. Choose the best alternative in each case:

a. The unit of measuring heat
i. Joule ii. Calorie

iii. Both a and b iv. None of these

b. The main source of heat
i. Fuels ii. Electricity

iii. Food iv. Sun

c. Which of the following is not the effect of heat?

i. Rise in the temperature of a body
ii. Expansion of an object
iii. Preparation of food by plants

iv. Change in the state of matter

d. Which of the following is the SI unit of temperature?

i. Degree Celsius ii. Degree Fahrenheit

Times' Crucial Science and Environment 50 Book 6