Transformation of Energy

Q. What energy transformation takes place in a simple electric fan?

1. Heat energy - Electrical energy
2. Light energy - Electric energy
3. Electrical energy - Potential energy
4. Electrical energy - Kinetic energy

Q. Firecrackers converts _______ energy to _______ energy.

1. chemical, light
2. solar, light
3. mechanical, chemical
4. atomic, light

Q.

Which of the following energy transformations takes place in case of lightning?

1. Electrical energy $\to$ Chemical energy

2. Electrical energy $\to$ Light energy

3. Heat energy $\to$ Electrical energy

4. Light energy $\to$ Electrical energy

Q. In a hydro power plant, potential energy of water is finally converted into:

1. Heat energy
2. Sound energy
3. Chemical energy
4. Electrical energy

Q.

The energy that produces the sensation of hearing is called __.

1. Mechanical energy

2. Light energy

3. Sound energy

4. Chemical energy

Q.

Which energy of water is used to produce hydroelectricity?

1. Kinetic energy

2. Potential energy

3. Both a and b

4. None of the options

Q.

Can kinetic energy be stored in a battery?

Q.

What is mechanical energy? What are its different forms?

Q. Turbine used in hydro electric power plant converts __________ energy of water to __________ energy.

1. kinetic, potential
2. kinetic, electrical
3. potential, heat
4. potential, kinetic

Q.

What type of energy is stored in a water-filled dam?

Q.

State the energy changes that occur when:

(i) a car moves up a slope

(ii) a solar-powered calculator is in use.

(iii) a clock spring is winded.

(iv) a battery lights up a bulb.

(v) a moving truck is brought to rest by applying the brakes.

Q.

The electricity produced by the flowing water is known as:

1. nuclear power

2. None of these

3. hydro-electric power

4. thermal power

Q.

Answer the following : (a) What are different types of energy? (b) Give the types of mechanical energy. (c) Give some examples of kinetic energy.

Q. Solar panels are used for harnessing solar energy. This solar energy is then used to rotate a fan. What are the energy changes which takes place?

1. Solar energy $\to$ Electrical energy $\to$ Kinetic energy
2. Kinetic energy $\to$ Solar energy $\to$ Chemical energy
3. Solar energy $\to$ Chemical energy $\to$ Potential energy
4. Solar energy $\to$ Electrical energy $\to$ Potential energy

Q.

Which type of energy is stored in the reservoir of a dam?

Q.

Water stored in dam at height possess kinetic energy

1. True
2. False

Q.

A moving body possesses _________ energy.

Q. Which of the following are required for sound propagation?

1. Medium
2. Source
3. Receiver
4. None of the above.

Q.

Water stored in a dam possesses

1. no energy

2. electrical energy

3. kinetic energy

4. potential energy

Q.

Which of the following energy resources uses potential energy of water for generating electricity?

1. Hydel energy

2. Wind energy

3. Atomic energy

4. Solar energy

Q.

State and explain a few examples of “Transformation of energy”.

Q.

Answer the following: Give the types of mechanical energy

Q.

Define kinetic energy. Give four examples of kinetic energy.

Q. A man eats glucose and then he pushes a block to move, which then comes to rest after sliding on a rough floor. The correct order of energy changes can be:

1. Chemical energy $\to$ Heat energy $\to$ Kinetic energy
2. Chemical energy $\to$ Kinetic energy $\to$ Heat energy
3. Heat energy $\to$ Kinetic energy $\to$ Chemical energy
4. Kinetic energy $\to$ Chemical energy $\to$ Heat energy

Q. Give one example each of the transformation of electrical energy into heat, light and mechanical energy and one example of the transformation of kinetic energy into electrical energy.

Q.

If I install a turbine in fast flowing stream of river without building a dam.What energy conversion/s happen/s for power generation?

1. kinetic energy to electrical energy

2. wind energy to electrical energy

3. potential energy to electrical energy

4. heat energy to electrical energy

Q.

What are inexhaustible natural resources?

Q.

Which of the following transform solar energy into electricity

1. Wind energy

2. Solar cell

3. Solar cooker

4. Biogas plant

Q.

In a hydropower plant

1. Potential energy possessed by stored water is converted into electricity

2. Electricity is extracted from water.

3. Water is converted into steam to produce electricity.

4. Kinetic energy possessed by stored water is converted into potential energy.

Q.

Suggest a few ways to conserve natural resources.