Environmental Science - General Knowledge Questions and Answers

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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

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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

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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Pipes and Cistern

Three taps A,B and C can fill a tank in 12, 15 and 20 hours respectively. If A is open all the time and B and C are open for one hour each alternatively, the tank will be full in?

Two pipes A and B can fill a tank in 6 hours and 4 hours respectively. If they are opened on alternate hours and if pipe A s opened first, in how many hours, the tank shall be full?

A large tanker can be filled by two pipes A and B in 60 min and 40 min respectively. How many minutes will it take to fill the tanker from empty state if B is used for first half of the time, and A and B fill it together for the other half?

A tank is filled by 3 pipes with uniform flow. The first two pipes operating simultaneously fill the tank in the same time during which the tank is filled by the third pipe alone. The 2nd pipe fills the tank 5 hours faster than first pipe and 4 hours slower than third pipe. The time required by first pipe is?

Two pipes A and B together can fill a cistern in 4 hours. Had they been opened separately, then B would have taken 6 hours more than A to fill the cistern. How much time will be taken by A to fill the cistern separately?

Two pipes A and B can fill a tank in 24 min and 32 min respectively. If both the pipes are opened simultaneously, after how much time B should be closed so that the tank is full in 18 min?

Two pipes A and B can fill a tank in 36 min and 45 min respectively. A water pipe C can empty the tank in 30 min. First A and B are opened. after 7 min, C is also opened. In how much time, the tank is full?

Two pipes can fill a cistern in 14 hours and 16 hours respectively. The pipes are opened simultaneously and it is found that due to leakage in the bottom it took 32 min more to fill the cistern. When the cistern is full, in what time will the leak empty it?

Bucket P has thrice the capacity as Bucket Q. It takes 60 turns for Bucket P to fill the empty drum. How many turns it will take for both the buckets P and Q, having each turn together to fill the empty drum?

Probability

In a class , 30 % of the students offered English, 20 % offered Hindi and 10 % offered Both.If a student is offered at random, what is the probability that he has offered English or Hindi?

In a lottery ,there are 10 prizes and 25 blanks.A lottery is drawn at random. what is the probability of getting a prize ?

Two dice are thrown simultaneously .what is the probability of getting two numbers whose product is even?

Two diced are tossed the probability that the total score is a prime number?

Two cards are drawn at random from a pack of 52 cards What is the probability that either both are black or both are queens?

Two dice are thrown together .What is the probability that the sum of the number on the two faces is divisible by 4 or 6?

A bag contains 6 white and 4 black balls .Two balls are drawn at random .Find the probability that they are of the same colour?

In a simultaneous throw of a pair of dice,find the probability of getting a total more than 7?

An unbiased die is tossed.Find the probability of getting a multiple of 3?

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