Tag: protecting our environment

Questions Related to protecting our environment

Photovoltaic cells are semiconductors of

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  1. Silicon

  2. Gallium arsinide

  3. Cadmium telluride

  4. All of the above

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Correct Option: D
Explanation:

Photovoltaic cells are used in trapping solar energy. These are made of semiconductors that can lose the electrons when exposed to the sunlight to generate the electric current. The semiconductor material used can be silicon, gallium arsenide, cadmium telluride. Silicon is the most preferred because of its uniform crystalline structure. Cadmium Telluride provides a low-cost alternative that is also highly absorptive of solar energy. Gallium arsenide is used for its resistance to the harmful effects of the radiations. It is generally used for space photovoltaic cells.

Hence, the correct answer is 'All of the above'

Solar energy can be trapped through

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  1. Direct heating

  2. Thermoelectric conversion

  3. Photovoltaic conversion

  4. All of the above

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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.

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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 example for fossil fuel is 

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  1. Copper

  2. Iron

  3. Magnesium

  4. Coal

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Correct Option: D

Which one of the following is a renewable source of energy?

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  1. Natural gas

  2. Geothermal energy

  3. Diesel

  4. Timber

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Correct Option: B
Explanation:

Geothermal energy is the heat energy which is obtained from the interior of the Earth. However, this energy is not equally available everywhere and is concentrated in some parts of the world such as natural geysers. This is a natural and renewable source of energy that can be used for heating processes in various activities.

Thus, the correct answer is option B. 

Which of the following is non-renewable resource?

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  1. Forest

  2. Coal deposit

  3. Water

  4. Wild life

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Correct Option: B
Explanation:

Fossil fuels are nonrenewable conventional energy resources found inside the earth's crust where they have been formed through heat and compression on forests and other organic matter buried underneath due to earthquakes, landslides, lava etc. Fossil fuels can be solid, e.g., coal; liquid, e.g., petroleum; or gaseous, e.g., natural gas.

Non-renewable source is

evs - i rules are for everyone natural resources and their types promotion of renewable resources protecting our environment sustainability of natural resources adaptations - mangrove swamps, fast flowing rivers and treetops halophiles

  1. Water and gas

  2. Plant and coke

  3. Coal and mineral substances

  4. Energy and water

Show answer
Correct Option: C
Explanation:

Inexhaustible resource is a natural resource, which is found in such abundance, that it is unlikely to diminish or get exhausted. E.g., air, solar energy, wind power, rainfall etc.
Exhaustible resource is a natural resource, which is likely to diminish and get exhausted due to continuous use or exploitation. E.g., minerals, fossil fuels, forests etc. Exhaustible resources are of two types renewable and non-renewable.
Renewable exhaustible resource is a natural resource, which gets replenished, recycled or reproduced. E.g., forests, water, agriculture etc.
Non-Renewable exhaustible resource is a natural resource, which is likely to get exhausted with use. E.g., fossil fuels like petroleum, minerals and metals, Coal.

Water is a..................resource.

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  1. Non-degradable, non maintainable

  2. Degradable, maintainable

  3. Renewable

  4. Non-renewable

Show answer
Correct Option: C
Explanation:

Natural Resources or Earth resources are those living and non living components of atmosphere, hydrosphere and lithosphere, which can be drawn for supporting life or have potential of being used by humans for their requirements of food, fodder, shelter, clothing, articles of use and recreation.

Inexhaustible resource is a natural resource, which is found in such abundance, that it is unlikely to diminish or get exhausted. E.g., air, solar energy, wind power, rainfall etc.
Exhaustible resource is a natural resource, which is likely to diminish and get exhausted due to continuous use or exploitation. E.g., minerals, fossil fuels, forests etc. Exhaustible resources are of two types renewable and non-renewable.
Renewable exhaustible resource is a natural resource, which gets replenished, recycled or reproduced. E.g., forests, water, agriculture etc.
Non-Renewable exhaustible resource is a natural resource, which is likely to get exhausted with use. E.g., fossil fuels like petroleum, minerals and metals.