Tag: protecting our environment

Questions Related to protecting our environment

A biogas plant works to its maximum capacity when

commercial applications management of natural resources unequal distribution of resources protecting our environment rules are for everyone

  1. Conditions are aerobic and sewage is supplied

  2. Conditions are anaerobic and temperature $40^oC$

  3. Conditions are aerobic and temperature $40^oC$

  4. Conditions are anaerobic and sewage is supplied

Show answer
Correct Option: B
Explanation:

Biogas refers to a mixture of different gases produced by the breakdown of organic matter in the absence of oxygen. Biogas is produced by anaerobic digestion with methanogen or anaerobic organisms, which digest material inside a closed system or fermentation of biodegradable materials. There are two key processes: mesophilic and thermophilic digestion which is dependent on temperature. Research in biogas production indicates that the optimal temperature for mesophilic bacteria is around 37°C and around 55°C for thermophilic bacteria.


So, the correct answer is 'Conditions are anaerobic and temperature 40C'.

Electricity is a natural resource.

commercial applications management of natural resources unequal distribution of resources protecting our environment rules are for everyone

  1. True

  2. False

  3. Nither

  4. Either

Show answer
Correct Option: C
Explanation:

 Electricity in its natural form is from lightening. Various natural resources like wind (wind mills), water (turbines), fossil fuels are used to produce electricity. Therefore, electricity is a product obtained using natural resource and its since natural form cannot be easily harnessed  so cannot be nither classified as a natural resource nor a man made product.

So, the correct answer is 'Nither'

___________ energy is the energy stored within the earth.

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  1. Geothermal

  2. Mechanical

  3. Wind

  4. Thermal

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Correct Option: A

According to the Stefan-Boltzmann law, the radiative energy emitted by one square meter of an object is equal to a constant multiplied by its temperature raised to the ____________ power.

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  1. Negative third

  2. Zeroeth

  3. Fourth

  4. Tenth

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Correct Option: C

__________ energy is the main driving force of the ecological system.

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  1. Hydro

  2. Solar

  3. Electric

  4. Mechanical

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Correct Option: B

Thermal belts are:

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  1. Pockets of warm air resting on a valley during the afternoon

  2. Pockets of cold air resting on a valley floor at night

  3. Warmer hillsides that are less likely to experience freezing conditions

  4. Cold, below-freezing air found at the top of a mountain

Show answer
Correct Option: C

India ranks .__________ amongst the wind-energy producing countries of the world.

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  1. First

  2. Second

  3. Third

  4. Fourth

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Correct Option: D

Charged particles from the sun that travel through space at high speeds are called:

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  1. Radiation

  2. The aurora

  3. Solar wind

  4. Solar flares

Show answer
Correct Option: C

Consider the following statements:
(a) Our energy requirements increase with our standard of living.
(b) We need to look for more and more sources of energy to meet our energy requirements.
Which of the above statement(s) is/are correct?

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  1. Only (a)

  2. Only (b)

  3. Both (a) and (b)

  4. Neither (a) nor (b)

Show answer
Correct Option: C
Explanation:
The standard of living involves the type of diet and the work we perform every day. The individuals who perform more work require more energy. The energy requirements depend on the lifestyle of every individual. 
The population is expanding day by day. In order to meet the requirements, there is need to search for more sources of energy. Different methods have been used for the increase in the quantity and the quality of the food. 
Thus, the correct answer is option C. 

Pollution from animal excreta and organic waste from kitchen can be most profitably minimized by 

commercial applications management of natural resources unequal distribution of resources protecting our environment rules are for everyone

  1. Storing them in underground storage tanks

  2. Using them for producing biogas

  3. Vermiculture

  4. Using them directly as biofertilizers

Show answer
Correct Option: B
Explanation:

Biogas is a mixture of methane, carbon dioxide and other trace gases which can be converted to heat, electricity or light. Small-scale biogas reactors are designed to produce biogas at the household or community level in rural areas. 

Animal manure and kitchen waste contain a lot of organic matter and generally, the process produces enough biogas for the family to cover at least cooking requirements. Humans produce less excreta, which contains less material that can be converted to biogas than animal dung (e.g., cows). 
However, toilets, if available can directly be linked to the biogas plant, where human faeces are digested together with the other wastes. This option provides a safe treatment of human excreta and thus improves the hygienic situation of the family. 
The availability of a renewable green energy source reduces the use of firewood for cooking and indoor air pollution. Thus, biogas digesters have the potential to minimize health risks and environmental pollution by using human excreta as a resource for producing energy and fertilizer.