Conversion of Energy

Q.

How fire differ from flame?

Q.

What are the advantages of thermal energy?

Q. Which of the following devices is used to convert different forms of energy into heat energy ?

1. Ironbox
2. Heater
3. Automobile engines
4. Microphone

Q. Steam engine converts _______ energy to ______ energy.

1. 
   mechanical, heat
2. 
   heat, electrical
3. 
   heat, mechanical
4. 
   electrical, heat

Q. The radiant energy is stored in the form of chemical energy in

1. DNA
2. stored food
3. RNA
4. ATP

Q.

Choose the correct statement regarding the conversion of ice into water.

1. Ice converts into water by releasing heat.

2. Ice converts into water by absorbing heat.

3. It is not possible to convert ice into water.

4. Ice neither absorbs nor releases heat while converting into water.

Q. What is the significance of word 'thermal' in thermal power generation?

1. Fuel is burnt and then heat is absorbed.
2. Fuel is burnt and heat is produced.
3. Thermal refers to thermometer.
4. All of the above.

Q. State the two forms of energy in which energy is mainly utilised at our homes.

Q. Pick the equipment(s) in which energy conversion happen(s).

1. Gas stove
2. Solar heater
3. Cycle
4. Steam engine

Q. Which among the following energy transformations take place when we rub our hands together?

1. $Heatenergy\underset{}{\to Mechanicalenergy}$
2. $Mechanicalenergy\underset{}{\underset{}{\to }Soundenergy}$
3. $Mechanical\underset{}{energy\to Heatenergy}$
4. $Soundenergy\to Heatenergy$

Q. In heat engines, heat energy is converted into mechanical energy.

1. False
2. True