Conservation of Electricity

Q.

What are the applications of electrical energy?

Q.

Write the name of four different forms of energy and give an example where energy is transformed from one from into another.

Q. (a) Distinguish between renewable and non-renewable sources of energy.

(b) Choose the renewable sources of energy from the following list:
Coal, biogas, sun, natural gas [3 MARKS]

Q.

What are the ways to save electricity?

Q.

Energy can neither be created nor destroyed i.e. the total energy of an isolated system remains constant; however, it transforms from one form to another. The same phenomena applies when we burn a candle, chemical energy of wax is spent and converted to light energy.

1. True

2. False

Q. Most of the energy resources that we use today are .

1. renewable
2. non-renewable
3. non-transformable

Q. (a) Will the bulb glow in the circuit shown in Fig.? Explain. If not, what can be done to light the bulb?



(b) What happens when a bulb gets fused ?
[5 MARKS]

Q.

Statement 1: Energy can neither be created nor destroyed.
Statement 2: Energy cannot be converted from one form to another.

1. Only statement​ 1 is correct.

2. Only statement​ 2 is correct.

3. Both statements are correct.

4. Both statement s are wrong.

Q.

State and explain the law of conservation of energy with an example.

Q. Distinguish resource and Non-renewable resource.

Q. Statement I : Fossil fuels are renewable source of energy.
Statement II: Renewable sources are collected from resources which are naturally replenished on a human timescale, such as sunlight, wind, rain, tides, waves, and geothermal heat.

1. Both statement I and statement II are correct.
2. Both statement I and statement II are wrong.
3. Only statement I is correct.
4. Only statement II is correct.

Q.

Define the law of conservation of energy.

Q.

Suppose if you are leaving your room or house, which of the following practice is ideal to save electricity?

1. Turn off all the electrical appliances inside only.

2. Turn on the lights within the house compound

3. Turn off all the electrical appliances/lights that are not required inside as well as within the house compound.

4. Turn off the lights only.

Q.

Riya's room has an air conditioner, an electric fan and a paper fan. She feels a bit hot but she does not want to waste electricity, then which one among the following options should she use?

1. Air-conditioner

2. Electric fan

3. Open the windows and use the paper fan

4. Either an air conditioner or an electric fan

Q.

Which of the following statements prove the relationship between water levels in the dams and load shedding?

1. The steep fall in water level in dams causes the shortage of power.

2. The steep fall in water level in dams never causes the shortage of power.

3. The steep rise in water level in dams causes the shortage of power.

4. The steep rise in water level in dams never causes load shedding.

Q. Analyse the following situations when 'X' and 'Y' go to sleep at night:
'X' switches ON the AC and sets a timer so that it automatically goes off after half an hour.
'Y' switches ON the AC and sleeps. It runs until the morning when he wakes up.
Who is conservative? 'X' or 'Y'?

Q.

Plants convert light energy to chemical energy through photosynthesis; this is an example of:

1. Creation of energy.

2. Destruction of energy.

3. Transformation of energy from one form to another.

4. Reduction of energy

Q. If a resource can be replaced within ten years by natural processes, would you classify it as renewable or non-renewable?

Q. In which two ways are resources classified based on availability??

Q.

The number of stars on electric appliances ___

1. indicates the quality rate of the device

2. indicates the energy deficiency

3. indicates the energy efficiency

4. indicates the quality of the metal used in device

Q. The energy stored within a substance is called its internal energy .If true enter 1 else 0

1. 1

Q. Warm coffee is poured into a coffee mug and kept on a table, After some time we observe that coffee is not warm anymore, i.e., the temperature of coffee has decreased. Which among the following is the correct explanation for this phenomenon?

1. Heat energy of the warm coffee was destroyed.
2. Coffee absorbed all the heat energy.
3. Heat energy of the warm coffee was released into surroundings.
4. Coffee mug absorbs all the energy.

Q. Law of conservation of energy states that, Energy can neither be create nor destroyed. For example if we covert chemical energy to electrical energy, we are creating electrical energy. Then the law of conservation of energy should not have that we cannot create energy.

Q. If a resource can be replaced within ten years by natural processes, would you classify it as renewable of non-renewable? Give reasons.

Q.

Load-shedding and power cut are imposed ___

1. when the demand for electricity is more.

2. when the demand for electricity is less.

3. when there is excess electricity.

4. when there is no electricity maintainence work.

Q.

If energy is always conserved in a chemical or physical process, then why is there an energy crisis?

1. Energy is dissipated from a more usable form to a less usable form.
2. All of these.
3. Energy is getting lost in the universe.
4. Energy is getting destroyed.