Efficient Use of Energy

Q.

Describe three ways for the efficient use of energy.

Q.

Which of the following are environment-friendly practices?

1. Carrying cloth bags to put purchases in while shopping

2. Switching off unnecessary lights and fans

3. Walking to school instead of getting your mother to drop you on her scooter

4. All of the above

Q.

Can you suggest some changes in your school which would make it environment-friendly?

Q.

How can we contribute personally to the betterment of the environment?

Q.

What is carbon tax ? Who will pay it ?

Q.

1. What is "clean technology"?
2. Give two examples.

Q.

State four ways for the judicious use of energy.

Q.

Which of the following device is most efficient for the lighting purpose :

LED, CFL, Fluorescent tube light, Electric bulb.

Q.

The most non-polluting and efficient lighting device is :

(a) CFL (b) LED

(c) Fluorescent light (d) Electric bulb.

Q.

State two ways to save the energy.

Q.

Suggest three ways to maintain a balance between environment and development to survive.

Q.

What social initiatives must be taken for the sensitive use of energy ?

Q.

Why does blowing air put off a lighted match or a candle but aid a spark of fire?

Q.

What is meant by the efficient use of energy ?

Q.

What changes can you make in your habits to become more environment-friendly?

Q.

How does the proper insulation of home save energy ?

Q.

IEA is the short form of :

(a) Indian Energy Association

(b) Indian Eco Academy

(c) International Energy Agency

(d) International Eco Academy.

Q.

Give an example to explain that the use of modern eco-friendly technologies is more efficient and less polluting.

Q.

The capacity of wind mill farm situated in Kanyakumari is

1. 380 MW

2. 420 MW

3. 200 MW

4. 250 MW

Q. When can current skip a part of the circuit?

1. Short circuit
2. Series circuit
3. Power circuit
4. High resistance circuit

Q.

Which of the following is NOT a good fuel?

1. Economical

2. Smoke/pollution free

3. Easy to spend on burning

4. Able to produce huge amount of heat and energy on burning

Q. Match the following wires with their suitable colour options:

1. Live Wire
2. Earth Wire
3. Neutral Wire

Q.

Which of the following is the correct expression for increase in length of a wire in terms of its original length and rise in its temperature?.

1. 

2. 

3. 

4. 

Q.

Due to efficient load, energy consumption decreases.

1. True
2. False

Q.

Write the energy transformation in each of the following:

1. Generators
2. Solar cell
3. Preparation of chemical compounds
4. CFLs
5. Electric train
6. Car battery

Q.

What is the difference between emf and terminal voltage of a cell?

Q.

In what ways solar energy can be utilised?

Q. Identify the energy saving light bulb.

1. Incandescent bulb
2. Compact fluorescent light bulb
3. Light emitting diode bulb
4. Both B and C

Q.

We have an electric kettle rated at (60v, 5A). We have a mass of 10 kg that is placed such that the steam in the kettle is used to drive the mass in the horizontal direction.If the kettle runs for 5 minutes.What is the velocity of mass attained?

1. 100 m/s

2. 50 m/s

3. 30√20 m/s

4. 60√20 m/s

Q. Why the electrical gadgets used in a house such as bulbs, fans, heater, etc., are always connected in parallel, not in series:

1. To provide equal supply voltages to all the gadgets
2. Removal of one gadget will not affect the working of other gadgets
3. Both A and B
4. None of the above