Environmental Science - General Knowledge Questions and Answers

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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

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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 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

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

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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Fractions

First we increased the denominator of a positive fraction by 3 and then decrease it by 5.The sum of the resulting fractions proves to be equal to 2/3. Find the denominator of the fraction if its numerator is 2?

Simplification

If we divide a two digit number by the sum of its digits we get 4 as a quotient and 3 as a remainder. Now if we divide that two digit number by the product of its digits we get 3 as a quotient and 5 as a remainder . Find the two digit number?

Fractions

The denominators of an irreducible fraction is greater than the numerator by 2.If we reduce the numerator of the reciprocal fraction by 3 and subtract the given fraction from the resulting one,we get 1/15.Find the given fraction?

Simplification

If we add the square of the digit in the tens place of the positive two digit number to the product of the digits of that number we get 52,and if we add the square of the digit in the unit's place to the same product of the digits we get 117.Find the two digit number?

The sum of squares of the digits constituting a positive two digit number is 13, If we subtract 9 from that number we shall get a number written by the same digits in the reverse order. Find the number?

The arithmetic mean of two numbers is smaller by 24 than the larger of the two numbers and the GM of the same numbers exceeds by 12 the smaller of the numbers. Find the numbers?

A number being successively divided by 3,5,8 leaves remainder 1,4,7 respectively. Find the respective remainders if the order of divisors are reversed?

The sum of all possible two digit numbers formed from three different one digit natural numbers when divided by the sum of the original three numbers is equal to?

HCF and LCM

Find the HCF and LCM of the polynomial x2-5x+6 and x2-7x+10?

Simplification

When we multiply a certain two digit number by the sum of its digits , 405 is achieved. If we multiply the number written in reverse order of the same digits by the sum of the digits, we get 486. Find the number?

Average

The sum of two numbers is 15 and their geometric mean is 20% lower than their arithmetic mean. Find the numbers?

Numbers

The difference of 1025-7 and 1024+x is divisible by 3. find x=?

A number when divided by the sum of 555 and 445 gives two times their difference as quotient and 30 as remainder . The number is?

The sum of three prime numbers is 100.If one of them exceeds another by 36 then one of the numbers is?

Find the number of zeros in the factorial of the number 18?

If a number is multiplied by 22 and the same number is added to it then we get a number that is half the square of that number. Find the number?

In doing a division of a question with zero remainder,a candidate took 12 as divisor instead of 21.The quotient obtained by him was 35. The correct quotient is?

Fractions

A number when divided by 342 gives a remainder 47.When the same number is divided by 19 what would be the remainder?

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