CLASS 4 # ENERGY # YEARLY EXAM REVISION

Which among the following has heat and light energy?

• electric energy

• hydroelectric energy

• solar energy

• wind energy

The correct statements are :

• We need energy to apply force.

• Work can be done without using energy.

• Energy is the ability to do work.

• Work is not done if an object moves when force is applied on it.

The energy possessed by a body due to its position is called ______________ energy.

Plants use _______ energy to prepare food.

• 
• 
• 
• 

The action of _________ help to generate electricity.

Choose the options that help us to save energy.

• Switch off lights during the day.

• Travel short distances in a car.

• Switch off lights, fans and other electric appliances when they are in use.

• Use devices that use solar energy.

The alternative energy sources (renewable energy sources) among the following are:

• Solar energy, Wind energy and Coal

• Solar energy, Petrol and Coal

• Petrol , hydroelectric energy and Coal

• Solar energy, Wind energy and hydroelectric energy.

The gas produced by decaying organic things like animal dung, dead animals and food wastes is

• Biogas

• Carbon dioxide

• Kerosene

• Natural gas

Choose the option that shows energy conversion in door bell.

Choose the option that shows energy conversion in burning of wood.

• Light energy  $\rightarrow$ Heat energy

• Heat energy  $\rightarrow$ Light energy

• Chemical energy  $\rightarrow$ Heat energy

• Heat energy  $\rightarrow$ Chemical energy