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Class seven science Ch 4 Heat Additional Questions

Chapter 4: Heat

Additional Questions-answers

Objective Questions

State True or False:

1. The solids that don’t allow heat to pass through them are known as conductors.

2. The method of transferring heat by the movement of the particles of substance away from the source of heat is known as conduction.

3. Aluminium is a very good conductor of electricity.

4. In solids, the heat is transferred through radiation.

5. A clinical thermometer has a kink; it prevents the mercury level from falling on its own.

Answer

a. False

b. False

c. True

d. False

Match the following:

Answers

1. c 2. d 3. a 4. b

Fill in the blanks:

1. There are hot and cold objects around us but there is certainly a comparison

between their———— of coldness/ hotness.

2. A clinical thermometer reads the temperature from 35°C to———–.

3. Make sure that before you use a thermometer its mercury level is———  35°C.

4. All hot bodies around us———- heat.

5. Dark surfaces absorb———— heat as compared to light ones.

Answers

1. Degree

2. 42°C

3. Below

4. Radiates

Very Short Answer Type Questions:

1. Define the term ‘temperature’.

Answers The measure of hotness or coldness of an object can be defined as temperature.

2. What is meant by thermometer?

Answers Thermometer is a device that is used to measure temperature.

3. A clinical thermometer is used for what purpose?

Answers A clinical thermometer is used to measure the temperature of our body.

4. What is conduction?

Answer The process through which heat is transferred from the hotter part to the colder part of an object is known as conduction.

5. What is the normal temperature of the human body?

Answer The normal temperature of the human body is 37°C.

6. Name two poor conductors of electricity.

Answer Wood and plastic are poor conductors of electricity.

7. Name any two good conductors of electricity.

Answer Copper and aluminium are good conductors of electricity.

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