Heat Energy

Q.

What is observed when a bottle containing cold drink is opened? Give reason. [3 MARKS]

Q. Which of the following form(s) of energy is/are released when a cracker is ignited?

1. Heat

2. Light

3. Sound

4. Electrical

Q. What are the forms of energy used for doing the different activities shown in the table? ​ [2 marks]

Context ​	Form of energy used	Marks
Electrical Riding motor vehicles​
Drying clothes​
Bulbs glowing ​
Loudspeakers working

Q.

Identify the energy "X" given to the beaker at each stage of phase change from the below image.

1. Chemical energy

2. Electrical energy

3. Sound energy

4. Heat energy

Q.

Define energy converters.

Q.

Which energy assists in the melting of an ice cube?

1. Sound energy

2. Light energy

3. Heat energy

4. Electrical energy

Q. Heating of a substance can cause its expansion.

1. True
2. False

Q. Which of the following are examples of a change caused due to heating?

1. Melting of ice
2. Boiling of water
3. Cooking of food
4. Cutting of wood
5. Tearing of paper
6. Drying of cloth
7. Boiling of rice
8. Writing on paper