Sources of Heat Energy

Q.

More non-conventional sources of energy should be used. Give reason

Q.

Biogas is produced by the conversion of biodegradable waste matter into compost in the absence of oxygen.

1. False
2. True

Q.

Write any three uses of charcoal.

Q. Identify the components A, B, C & D of Biogas plant.

1. A - Gas outlet, B - Manure, C - Digester, D - Slurry
2. A - Slurry, B - Gas outlet, C - Manure, D - Digester
3. A - Slurry, B - Digester, C - Manure, D - Gas outlet
4. A - Manure, B - Slurry, C - Digester, D - Gas outlet

Q. Which of the following is a Fossil Fuel?

1. Coal
2. Wood
3. Solar radiation
4. Charcoal

Q.

Is oil a biomass fuel?

Q.

Why is biomass not carbon neutral?

Q.

Does biomass produce CO₂?

Q. Consider the following items:

1. Wood
2. Uranium
3. Animal waste
4. Electric cell
5. Food scraps

Which of the given items can be classified as a fuel for biogas?

1. 2 and 4 only
2. 3, 4, and 5 only
3. 1, 3, and 5 only
4. 2 and 3 only

Q.

Which of the following energy sources is different from others ?

1. solar energy

2. wind energy

3. tidal energy

4. Fossil fuels

Q.

Water is the ultimate source of energy.

1. True

2. False

Q. what are fossils fuels ?

Q.

Statement 1: Solar energy is a conventional form of energy.
Statement 2: Solar energy is a renewable form of energy.

1. Both statement​s are correct.

2. Only statement​ 1 is correct.

3. Both statement​s are wrong.

4. Only statement​ 2 is correct.

Q.

The aerobic digestion of sweage is used to produce

1. Biomass

2. Biofuels

3. Fossil fuels

4. Synthetic fuel

Q. Which of the following correctly matches the part of a biogas plant with the process taking place in there?

1. Dome Shaped Gas Chamber - burning of gas to produce heat
2. Gas outlet - supplies oxygen
3. Digester - Anaerobic respiration
4. Mixing Tank - Adding petrol to cow dung

Q. How is charcoal prepared?

1. When wood is heated with cow dung and $C{O}_2$ then the residue is charcoal.
2. When wood is boiled in water followed by evaporation, the residue is charcoal.
3. When wood is burnt in a limited supply of oxygen and water until volatile materials are removed, the residue is charcoal.
4. All of these.

Q.

How are biomass fuels produced?

1. Fuels produced from the processing of fossil fuels.

2. Fuels that do not require oxygen to burn.

3. Fuels produced from plant and animal (biological) matter.

4. Fuels produced from artificial chemical compounds.

Q.

Solar energy, wind energy and geothermal energy are examples of

1. Renewable Energy

2. Non-renewable Energy

3. Compost energy

4. Biodegradable energy

Q.

How is charcoal prepared?

Q.

Why bio gas is also termed as gobar gas?

1. gobar gas is a gas which is produced from bio mass hence the name

2. gobar is the major contituent of the slurry which is used in production of bio gas

3. all of these

4. gobar constitutes 99% of the bio gas

Q. Chemically the major component of charcoal is:

1. Iron
2. Sulphur
3. Dry ice (solid carbon dioxide)
4. Carbon

Q.

A given substance of mass m is in solid state at certain temperature. Arrange the following steps in proper sequence to calcualte the total heat energy required to just convert the substance completely into gaseous state.

(a). Note down the specific latent heat of vaporization of the substance and calculate the heat supplied to convert from liquid to gaseous state using the formula.

(b) Note down the melting point of the substance and calculate the heat supplied to increase the temperature of the solid to its melting point.

(c) Note down the boiling point of the substance and calculate the heat supplied to increase the temperature of the substance from melting point to its boiling point.

(d). Add all the heat energies, it gives the resultant hea supplied to the solid to just convert it into gaseous state.

(e) Note down the specific latent heat of fusion of the substance and calculate the heat supplied to convert the substance from solid state to liquid state.

1. B D E C A

2. A C E D B

3. A B C D E

4. B E C A D

Q.

Which is the ultimate source of energy?

1. Fossil fuels

2. Water

3. Sun

4. Uranium

Q.

Charcoal is chemically pure

1. Iron

2. Sulphur

3. Carbon

4. Dry ice (solid carbon dioxide)

Q. Fossil fuels are formed from:

1. The solidified lava originated from volcanic eruptions

2. Burning of wood with the limited oxygen supply

3. Living organisms buried inside the Earth for millions of years

4. The washing down of rocks by water flow for millions of years

Q.

Which of the following is/are correct about conventional sources of energy?

1. The sources of energy which are exhaustible.

2. The sources of energy which cannot be renewed.

3. A conventional source of energy is one which is present in a limited amount in nature.

4. Conventional sources of energy had been in use for most of the human history.

Q.

Which among the following are in biogas?

1. Neither air nor water
2. Air but not water
3. Water but no air
4. Air and Water

Q.

Coal deposits which are not economical to mine today, are considered as

1. Coal dump
2. Coal plant
3. Coal reservoirs
4. Coal resources

Q.

Biogas typically refers to a mixture of different gases produced by the breakdown of organic matter in the absence of oxygen.

1. True

2. False