Tag: unequal distribution of resources

Questions Related to unequal distribution of resources

Solar energy can be trapped through

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  1. Direct heating

  2. Thermoelectric conversion

  3. Photovoltaic conversion

  4. All of the above

Show answer
Correct Option: D
Explanation:

Solar energy can be trapped through the following:

A. Direct heating of the solar energy uses pumps and fans to circulate the heat gathered by the solar collectors. It is widely used in water heating system.
B. Thermoelectric conversion converts the solar energy directly to the electrical energy by creating a voltage effect due to the difference in the temperature.
C. Photovoltaic conversion produces electricity through solar energy by maintaining an electron flow. The release of electrons when exposed to sunlight creates an electric current along the path of the electron movement.
Hence, the correct answer is 'All of the above'

The interior of a cow-dung pile kept for a few days is quite warm. This is mostly because

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  1. Cellulose present in the dung is a good insulator .

  2. Bacterial metabolism inside the dung releases heat.

  3. Undigested material releases heat due to oxidation by air.

  4. Dung is dark and absorbs a lot of heat.

Show answer
Correct Option: B
Explanation:

At the later stages of decomposition of cowdung, mesophilic micro-organisms decompose the dung, generating heat from exothermic( process which produces heat) processes; such heat generation is associated with the well known phenomenon of the elevated temperature of composting.

Geo-thermal energy is a conventional source of energy.

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  1. True

  2. False

  3. Nither

  4. Either

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Correct Option: B

Which one of the following is a non-replenishable resource?

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  1. minerals

  2. forests

  3. mineral fuel

  4. hydroelectricity

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Correct Option: C

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 inexhaustible non-conventional resource. Its use is yet to pick up because of requirement of back up system to store and generate electricity during night and during cloudy days. There are three methods of harnessing solar energy- direct heating (e.g., solar cookers), thermoelectric conversion or solar thermal power plants, e.g., steam generation and photovoltaic conversion.

Universal nonpolluting source of energy is

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  1. Fossil fuel

  2. Sun

  3. Nucleus

  4. Wind and water

Show answer
Correct Option: B
Explanation:

Renewable source of energy include biomass energy and some forms of inexhaustible energy like solar energy, hydropower, wind power, tidal energy, wave energy, geothermal energy etc. 

Solar energy is universal, inexhaustible, non-conventional resource, which is non-polluting. It is considered universal because solar energy is available on all places and it does not leads to any type of pollution. However, it may not be harnessed easily. Green plants trap solar energy and convert it into chemical energy stored in sugars, which are utilised by all other organisms.

Source of energy which does not evolve CO$ _{2}$ is

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  1. Coal

  2. Oil

  3. Organic compounds

  4. Nuclear energy

Show answer
Correct Option: D
Explanation:

Coal and oil are fossil fuels been derived from dead bodies of plants and animals, which existed in past. Hence, they are carbon compounds and emit carbon dioxide on combustion. Organic compounds are obviously compounds of carbon and will evolve carbon dioxide on combustion. Nuclear energy is non conventional, non renewable resource. Nuclear fission (now fusion also) of selected radioactive materials yields large amount of heat energy. For example one amu of Uranium - 235 yields energy equal to burning of 15 metric tonnes of coal. The energy released in nuclear fission and fusion is not due to combustion process and hence, does not evolves carbon dioxide.

From the list given below, pick the item that is not a natural resource.

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  1. Soil

  2. Water

  3. Electricity

  4. Air

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Correct Option: C
Explanation:

Electricity can be created/generated and is man-made. Air, water and soil are all natural resources and cannot be created by humans.

Which of the following is the most appropriate definition of a natural resource?

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  1. It is present only on land.

  2. It is a gift of nature, which is very useful to mankind.

  3. It is a man-made substance placed in nature.

  4. It is available only in the forest.

Show answer
Correct Option: B
Explanation:

Natural resources occur naturally in our environment. They cannot be created by man.

Which of the following is not a natural resource?

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  1. Mango tree

  2. Snake

  3. Wind

  4. Wooden house

Show answer
Correct Option: D
Explanation:

Natural resources are the resources made available by the nature to us. The important natural resources are the trees, animals and climatic factors like wind. All of these can be used variously to generate goods and services for our benefit. For example- trees provide us fruits, fresh air, timber etc. All animals and plants are important for the ecological balance on the Earth. Further some animals are of direct economic benefit for mankind. Climatic factors like sunlight and wind power can be harnessed to generate energy.