Tag: protecting our environment

Questions Related to protecting our environment

For biogas production, besides dung an extensive use of which weed is recommended in our country

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  1. Mangifera indica

  2. Hydrilla

  3. Eichhornia crassipes

  4. Solanum

Show answer
Correct Option: C
Explanation:

Eichhornia crassipes is an excellent source of biomass because of its extremely high rate of development. One hectare of standing crop thus produce more than 70,000 m$^3$ of biogas.

Thus, the correct answer is option C. 

The process in which water vapour changes to liquid is called

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  1. Condensation

  2. Evaporation

  3. Transpiration

  4. Precipitation

Show answer
Correct Option: A
Explanation:

Sun derives the water cycle, heats up water in ocean and seas, and then water vapours evaporate to air. As the vapours move upward the cool temperature there causes it to condense into clouds and they fall as precipitate like rain, hailstone etc.

What are the advantage of gobar gas over conventional utilization?

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  1. More efficient source of energy

  2. Used as good fertilizer

  3. Reduces the chances of spreading of pathogens

  4. All of the above

Show answer
Correct Option: D

Best economic method to harvest the solar energy is

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  1. Solar cell

  2. Energy plantation

  3. Cultivation of sugar cane then energy obtain by burning it

  4. Solar cooker

Show answer
Correct Option: B
Explanation:

The economics of terrestrial growth of vegetation for its energy content is far more favourable than other more technically sophisticated methods of large-scale solar energy conversion. The most traditional is to use the ability of plants to convert the suns energy into fuel molecules; this is cheap, deployable at scale, and provides the energy in easily storable form, but its not very efficient and so needs a lot of land.

Gobar gas contains mainly

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  1. CH$ _{4}$ + CO$ _{2}$

  2. CH$ _{4}$ + O$ _{2}$

  3. CO$ _{2}$ + H$ _{2}$

  4. CO$ _{2}$ + SO$ _{2}$

Show answer
Correct Option: A
Explanation:

Biogas (gobar gas) is primarily methane (CH$ _4$) and carbon dioxide (CO$ _2$) and may have small amounts of hydrogen sulphide (H$ _2$S), moisture and siloxanes.

Thus, the correct answer is option A.

Biogas consists of

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  1. Carbon monoxide, methane and hydrogen.

  2. Carbon dioxide, methane and hydrogen.

  3. Carbon monoxide, ethane and hydrogen.

  4. Carbon dioxide, ethane and hydrogen.

Show answer
Correct Option: B
Explanation:

Biogas consists mostly of methane (CH$ _4$), carbon dioxide (CO$ _2$) and a mix of trace gases including nitrogen, hydrogen sulfide (H$ _2$S), hydrogen and others. Methane is the main constituent (63%) of the biogas. The other major constituent is CO$ _2$ (30%).

Thus, the correct answer is option B.

There is a high accumulation of garbage in the past recent days in Bangalore. What would you suggest to the government as to how could the garbage be converted into cooking gas by decomposing. Which organism is involved in the process of conversion?

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  1. Klebsiella

  2. Yeast

  3. Methanogen

  4. Clostridium

Show answer
Correct Option: C
Explanation:
Methanogens convert organic products to methane and carbon dioxide. The methanogenic archaea populations play an indispensable role in anaerobic wastewater treatments. It is used as part of the process to treat biodegradable waste and sewage sludge. As part of an integrated waste management system, anaerobic digestion reduces the emission of landfill gas into the atmosphere. 
Therefore, the correct answer is option C.

Bio-gas can be converted into _______.

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  1. Fuel

  2. Electricity

  3. Fertilizer

  4. Both A and B

Show answer
Correct Option: D
Explanation:

Material recovery is possible from industrial waste. Organic waste can be used for energy production with various processes such as bio-gas production.

Common energy source in villages is

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  1. Electricity

  2. Coal

  3. Biogas

  4. Wood and animal dung

Show answer
Correct Option: D
Explanation:
Energy is the most important constituents of the living part of the human being.
Now we can generate energy in different ways like hydropower, wind energy, biogas, and many more but today also in villages the trend is being used for producing energy by using wood and animal dung.
So, the correct answer is 'Wood and animal dung'

An inexhaustible non-conventional universal source of energy is

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  1. Wind energy

  2. Solar energy

  3. Hydrothermal energy

  4. Tidal energy

Show answer
Correct Option: B
Explanation:

Solar energy is considered to be the non-conventional because it is not derived from the conventional fossil fuels. It is inexhaustible as it will not be used up completely. It will not take much time in regeneration. It is universal as most of the places on earth that sustain a large population get the sunlight. Wind energy is also non-conventional and inexhaustible but it is not available to every area. It can be harnessed in areas that witness a low pressure, like equatorial and tropical areas. Similarly, the tidal energy is available to the coastal areas. Hydrothermal resources are available everywhere but need a heavy economic investment for their usage.

Hence, the correct answer is 'Solar energy'.