Environmental Science - General Knowledge Questions and Answers

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Nitrogen fixation is accomplished by?

A)

Bacteria in the atmosphere


B)

Bacteria in the soil


C)

Plants


D)

Fungi



Correct Answer :

Bacteria in the soil

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A variety of different bacteria and yeasts live on human skin. Together they are considered to be a/an?

A)

Ecosystem


B)

Population


C)

Community


D)

Trophic level



Correct Answer :

Community

The method of rainwater harvesting which can be adopted by individual house owners is?

A)

Construction of recharge trenches


B)

Onchannel storage of water


C)

Harvesting new water channel


D)

Rooftop rainwater harvesting



Correct Answer :

Rooftop rainwater harvesting


Explanation :

Roof-top rainwater harvesting (RRH) involves diverting and recharging (or) storing of the rainwater that falls on the roof of a house.
RRH is a common practice implemented in individual houses as well as apartment complexes for recharging of ground water. In such cases, harvested water is directed into a recharge pit which collects and slowly recharges into the groundwater storage / aquifer in that area.

Fuel cost is zero in which kind of energy?

A)

Wind energy


B)

Coal energy


C)

Nuclear Energy


D)

Tidal energy



Correct Answer :

Wind energy


Explanation :

Wind, Solar Are The cheapest sources of power generation.

Coal based thermal power plant works on which principal?

A)

Modified Rankine Cycle


B)

Threshold frequency


C)

Gibbs free energy


D)

Entropy



Correct Answer :

Modified Rankine Cycle


Explanation :

Rankine cycle is a mechanical cycle which is used to convert the pressure energy of steam into mechanical energy using turbines.A modified Rankine cycle is used to increase the efficiency of the same Rankine cycle by either reheat or using regenerative cycle.

A chemical reaction triggered by ____ transforms organic material into hydrocarbons?

A)

solar energy


B)

hydroelectric


C)

elevated temperatures


D)

decomposition



Correct Answer :

elevated temperatures

Energy resources derived from natural organic materials is called ?

A)

Geothermal energy sources


B)

Fossil fuels


C)

Biomass


D)

None of the above



Correct Answer :

Fossil fuels

Which of the following rock types would most likely be the best oil reservoir?

A)

granite


B)

shale


C)

sandstone


D)

salt



Correct Answer :

sandstone

The world has the least amount of which of the following fuel types?

A)

Oil


B)

Coal


C)

Uranium


D)

There are roughly equal amounts of each of these fuels



Correct Answer :

Oil

The percentage of total world’s precipitation, lost to the atmosphere through evaporation, is approximately?

A)

57%


B)

7%


C)

37%


D)

43%



Correct Answer :

57%

The main constituent of LPG is?

A)

Liquid methane


B)

Liquid butane


C)

Liquid hydrogen


D)

Liquid ethane



Correct Answer :

Liquid butane

Pollination by Birds is known as?

A)

Autogamy


B)

Entomophilly


C)

Ornithophilly


D)

Marmacophilly



Correct Answer :

Ornithophilly


Explanation :

Ornithophily or bird pollination is the pollination of flowering plants by birds.

The agent moving the pollen, whether it is moths, bees, bats, wind or birds are called the “pollinator” and the plant providing the pollen is called the “pollenizer”. The term biotic pollination is used when pollination is aided by a pollinator. When this is done by birds, the term used is Ornithophily.

Which is an example of fossil fuel?

A)

coal


B)

methane


C)

natural gas


D)

All the above



Correct Answer :

All the above

In study of satellite imageries GIS stands for ?

A)

Geographical Information System


B)

Geographical Integrated System


C)

General Integrated System


D)

Geological Integrated system



Correct Answer :

Geographical Information System

A fuel cell, in order to produce electricity, burns?

A)

Helium


B)

Nitrogen


C)

Hydrogen


D)

Boron



Correct Answer :

Hydrogen

Blue whale is placed under?

A)

endangered


B)

critically endangered


C)

rare


D)

extinct



Correct Answer :

endangered

The most important reason for decrease in biodiversity is ?

A)

habitat pollution


B)

introduction of exotic species


C)

deforestation


D)

habitat destruction



Correct Answer :

habitat destruction

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Choose the option that substitutes the given phrase appropriately.
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Choose the option that best explains the highlighted expression:
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Choose the appropriate prepositions for the given sentence:
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