Tag: commercial applications

Questions Related to commercial applications

___________ 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.

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

  1. Hydro

  2. Solar

  3. Electric

  4. Mechanical

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Correct Option: B

Thermal belts are:

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

  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

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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:

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

  1. Radiation

  2. The aurora

  3. Solar wind

  4. Solar flares

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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?

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

  1. Only (a)

  2. Only (b)

  3. Both (a) and (b)

  4. Neither (a) nor (b)

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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

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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.

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

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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

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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.