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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 551. |
What would be the consequence of presence of following in water ? (i)Sulphates gt 500 ppm (ii)Fluorides between 2 ppm -10 ppm gt 10 ppm (iii)Nitrates gt 50 ppm |
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Answer» (i)Sulphates gt 500 ppm have laxative effect (ii)Fluorides gt 10 ppm cause brown mottling of teeth Fluorides gt 10 ppm are harmful to bones and teeth (iii) Nitrates gt 50 ppm cause methemoglobinemia (blue baby syndrome) |
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| 552. |
Assertion (A): If BOD level of water in a reservoir is less than 5 ppm it is highly polluted. Reason (R): High biological oxygen demand means low activity of bacteria in water.A. Both Assertion and Reason are correct and is the correct explanation of AssertionB. Both Assertion and Reason are correct but Reason is not the correct explanation of AssertionC. Both Assertion and Reason are not correctD. Assertion is not correct but Reason is correct |
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Answer» Correct Answer - C Correct Assertion. If BOD level is less than 5 ppm, water is almost pure Correct Reason. High biological oxygen demand means high activity of bacteria in water |
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| 553. |
Fly ash is a contaminant in air due toA. Thermal power plantsB. Nuclear power plantsC. Electrolytic refining of metalsD. Hydro power plants. |
| Answer» Correct Answer - 1 | |
| 554. |
The irritant redhaze in the traffic and congested places is due to:A. NitrogenB. CarbonC. SulphurD. `1, 2, 3` |
| Answer» Correct Answer - 1 | |
| 555. |
Which is not a gaseous air pollutant ?A. SmokeB. HydrocarbonsC. OzoneD. Oxides of sulphur |
| Answer» Correct Answer - A | |
| 556. |
The irritant redhaze in the traffic and congested places is due to:A. oxides of sulphurB. `SO_(2)` onlyC. oxides of nitrogenD. `SO_(3)` only |
| Answer» Correct Answer - C | |
| 557. |
Choose the incorrect match regarding acid rain.A. Aerosol particles of oxides-Wet depositionB. Aerosol particles of ammonium salts-Wet depositionC. `SO_(2)` absorption--Dry depositionD. `SO_(2)` absorption-Wet deposition |
| Answer» Correct Answer - D | |
| 558. |
Choose the incorrect statement.A. Sulphur dioxide is a poisonous gas to both plants and animals.B. Even a low concentration of sulphur dioxide causes respiratory diseases and stiffness of flower buds.C. Uncatalysed oxidation of sulphur dioxide is slow.D. Rate of production of `NO_(2)` is faster when nitric oxide reacts with ozone in the stratosphere. |
| Answer» Correct Answer - B | |
| 559. |
Identify the incorrect statement from the following:A. Oxides of nitrogen in the atmosphere can cause depletion of ozone layerB. Ozone absorbs the intense ultraviolet radiations of the sun.C. Depletion of ozone layer is because of its chemical reactions with chlorofluoro alkanesD. Ozone absorbs infrared radiations. |
| Answer» Correct Answer - 4 | |
| 560. |
Which of the following statement is incorrectA. Nitrogen and Mg can pollute waterB. All pollutantsC. Carbon monoxide is the major environment pollutantD. Lichens are affected by sulphur dioxide |
| Answer» Correct Answer - B | |
| 561. |
Brewery and sugar factory waste alter the quality of a water body by increasingA. pHB. TemperatureC. TurbidityD. COD and BOD |
| Answer» Correct Answer - D | |
| 562. |
The pollutants emitted by jet aeroplanes in outer atmosphere are known asA. LoessB. Photochemical oxidantsC. AerosolsD. Smog |
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Answer» Correct Answer - C Chemicals released in the atmosphere with force in the form of mist or vapours are called aerosols. Jet aeroplanes release aerosols which contain CFC. |
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| 563. |
The high amount of E.coli in water is the indicator ofA. Hardness of waterB. Industrial pollutionC. Sewage pollutionD. Presence of chlorine in water |
| Answer» Correct Answer - C | |
| 564. |
Bio-indicators are used forA. Oxygen demandB. Air pollutionC. Mineral presentD. All of these |
| Answer» Correct Answer - D | |
| 565. |
Air pollutant gases causing acid rain are :A. `H_(2), O_(3)`B. `CH_(4), O_(3)`C. `NO_(2), SO_(2)`D. `CO, CH_(4)` |
| Answer» Correct Answer - 3 | |
| 566. |
Which one of the following gases is known as chemical weed in iroposphere?A. `C_(2)H_(6)`B. `SO_(2)`C. `O_(3)`D. `NO_(2)` |
| Answer» Correct Answer - C | |
| 567. |
Which causes water pollution?A. Jet planesB. HerbicidesC. SmokeD. Combustion of fossils |
| Answer» Correct Answer - B | |
| 568. |
Depletion of ozone layer causesA. blood cancerB. skin cancerC. lung cancerD. breast cancer |
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Answer» Correct Answer - B Depletion of ozone layer causes skin cancer. |
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| 569. |
Depletion of ozone layer causesA. Increased transpirationB. Damages paints and fibresC. Causes aging of skinD. All of these |
| Answer» Correct Answer - D | |
| 570. |
The main reason of ozone layer depletion is :A. `CFCs`B. `Cl_(2)`C. `SO_(2)`D. `NO` |
| Answer» Correct Answer - A | |
| 571. |
Which one of the following is responsible for depletion of the ozone layer in the upper strata of the atmosphere ?A. polyhalogensB. ferroceneC. fullerenesD. freons |
| Answer» Correct Answer - D | |
| 572. |
Depletion of ozone layer causesA. blood cancerB. lung cancerC. skin cancerD. breast cancer |
| Answer» Correct Answer - C | |
| 573. |
From where does ozone come in the photochemical smog ? |
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Answer» Sunlight cause photochemical decomposition of `NO_(2)` into `NO` and O `NO_(2) overset(hc)rarrNO+[O]` Atomic oxygen is a highly reactive species. It combines with diatomic oxygen and forms ozone. `O_(2) + O + M rarr O_(3) + M` where, M is inert gas such as nitrogen. This, `O_(3)` is formed during the formation of smog. |
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| 574. |
Air pollutants that produce photochemical oxidants includeA. `CO_(2) CO and SO_(2)`B. Nitrous oxide ,nitric oxide and nitric acidC. Oxygen, chlorine nad nitric acidD. Ozone, chlorine and suphur dioxide. |
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Answer» Correct Answer - B Air pollutant that produce photochemical oxidatns include nitrous oxide, nitric oxide andnitric acid |
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| 575. |
`Cl_(2)`and `SO_(2)` are pollutants as well as bleaching agents . Their bleaching action is due toA. `SO_(2)`= Oxidation, `Cl_(2)`=OxidationB. `SO_(2)`= Reduction, `Cl_(2)`=ReductionC. `SO_(2)`= Oxidation, `Cl_(2)`=RedutionD. `SO_(2)`= Reduction, `Cl_(2)`=Oxidation |
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Answer» Correct Answer - D `SO_(2)` in the presence of moisture releases nascent `H` which acts as bleaching agent of flowers, textiles , etc. `SO_(2) + 2H_(2)O rarr H_(2)SO_(4)+underset("Bleaching agent")(2H)` `Cl_(2)` in the presence of moisture release nascent `O` which acts as bleaching agent. `Cl_(2)+H_(2)O rarr 2HCl+underset("Bleaching agent")(O)`. |
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| 576. |
Why COD is preferred over BOD ? |
| Answer» COD can be found in a few minutes whereas BOD requires at last 5 days | |
| 577. |
What are pesticides and herbicides? Explain giving examples. |
| Answer» Pesticides are a mixture of two or more substances. They are used for killing pests. Pests include insects, plant pathogens, weeds, mollusks, etc., that destroy the plant crop and spread diseases. Aldrin and dieldrin are the names of some common pesticides Herbicides are pesticides specially meant for killing weeds. For example, sodium chlorate `(NAClO_(3))`, sodium arsenite `(Na_(3)AsO_(3))`, etc. | |
| 578. |
For dry cleaning, in the place of tetrachloroethane, liquified carbon dioxide with suitable detergent is an alternative solvent. What type of harm of the enviorment will be prevented by stopping use of tetrachloroethane ? Will use of liquified carbon dioxide with detergent be completely safe from the point of the view of pollution? Explain |
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Answer» Tetrachloroethane, `Cl_(2)CH-CHI_(2)` is suspended to be carcinogenic and also contaminates the ground water. The harmful effect to will be prevented by using liquified `CO_(2)` along with suitable detergent. Use of liquified `CO_(2)` along with detergent will not the completely safe bacause most of the detergents are non-biodegradable and they cause water pollution. Moreover liquidified `CO_(2)` will ultimately enter into the atmosphere and contributed to the green house effect. |
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| 579. |
Assertion: The `pH` of aicd rain is less than `5.6` Reason: Carbon dioxide present in the atmosphere dissolves in rain water and forms carbonic acid.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true and the reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If assertion is false but reason is true. |
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Answer» Correct Answer - B Genenrally the `pH` of rain water is `5.6` because of the dissolution of `CO_(2)` from the atmosphere into rain water. When some other gases, like `SO_(2),NO_(2)` etc. also dissolve , the `pH` goes below `5.6` due to the presence of strong acids like `H_(2)SO_(4)` , `HNO_(3)` etc. This rain is now referred as acid rain. |
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| 580. |
Assertion: Green plants maintains an appropriate level of `CO_(2)` in the atmosphere. Reason: Green plants requires `CO_(2)` for photosynthesis and they, in turn, releases oxygen.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true and the reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If assertion is false but reason is true. |
| Answer» Correct Answer - A | |
| 581. |
Assertion (A) : The pH of acid rain is less than 5.6. Reason (R) : Carbon dioxide present in the atmosphere dissolves in rain water and forms carbonic acid.A. Both A and R are correct and R is the correct explanation of A.B. Both A and R are correct but R is not the correct explanation of A.C. Both A and R are not correct.D. A is not correct but R is correct. |
| Answer» Correct Answer - 2 | |
| 582. |
A farmer was using pesticides on his farm. He used the produce of his farm as food for rearing fishes, He was told that fishes were not fit for human consumption because large amount of pesticides had accumulated in the tissues of fishes. Explain how did this happen ? |
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Answer» Pesticides from soil are transferred into the crops from the crops these are transferred into rearing fish food. Pesticides entered [ into water through rearing fish food and finally entered into the bodies of the fishes . Therefore, pesticides are transferred from lower trophic level to higher trophic level through food chain. Over the time, the concentration of pesticides in fishes reach a level which causes serious metabolic and physiological disorder. |
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| 583. |
Green plants use carbon dioxide for photosynthesis and return oxygen to the atmosphere , even then carbon dioxide is considered to be responsible for green house effect. Explain why ? |
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Answer» Carbons dioxide is a natural constituent of atmosphere and is vital for all forms of plant life. It forms about `0.033%` by volume of atmosphere. It helps of maintain the temperature of the earth required for living organisms. A balance of `CO_(2)` is maintained in air because `CO_(2)` is produced from respiration, burning of fossil fuels and decomposition of lime stone but at the same time, it is consumed in photosynthesis by plants. However human acitivites have disturbed this balance and `CO_(2)` level in atmosphere is in increasing order. This has happened due to deforestation has risen about `25%` in the past century. During the past nearly `120` years, the average temperature of the planet has increased by somewhere between `0.4^(@)C` to `0.8^(@)C` Current estimated are that doubling the `CO_(2)` concentration will result in a temperature increase of between `1.0^(@)C` and `3.5^(@)C`. In green house effect, contribution of `CO_(2)` is `50%` and of other trace gases is also about `50%` |
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| 584. |
The gaseous envelope around the earth is known ias atmosphere. The lowest layer of this is extended upto `10` km from sea level , this layer isA. StratosphereB. TroposphereC. MesosphereD. Hydrosphere |
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Answer» Correct Answer - B is the correct answer. |
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| 585. |
The gaseous envelope around the earth is known as atmosphere. The lowest layer of this is extended upto 10 km from sea level. This layer is _______A. StratosphereB. TroposphereC. MesosphereD. Hydrosphere |
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Answer» Correct Answer - B The lowest layer of the atmosphere upto 10-11 km is called troposphere |
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| 586. |
The lowest region of atmosphere in which the human beings along with other organisms live is calledA. StratosphereB. troposphereC. trapeziumD. universe |
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Answer» Correct Answer - B The lowest region of atmosphere in which the human beings along with other organisms live is called troposphere. It exteds up to the height of 10 km from sea level. |
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| 587. |
What could be the harmful effects of improper management of industrial and domestir solid wate in a city ? |
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Answer» All the solid wastes either domestic or industrial are of two types (i) biodegradable and (ii) non-biodegradable If the disposal of these wastes is not properly done, these waste may find their way into sewers and some may be eaten up by the cattle. The non-biodegradable waste like polythene bags, it swallowed by cattle, can result into their death. |
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| 588. |
Which one of the following is not a bioindicator of water pollutionA. Sludge-wormsB. Blood-wormsC. Stone filesD. Sewage fungus |
| Answer» Correct Answer - C | |
| 589. |
A process that uses micro-organisms to convert harmful industrial wastes to less toxic or non-toxic compounds isA. Complement fixationB. PrecipitationC. BioremediationD. Bioconversion |
| Answer» Correct Answer - C | |
| 590. |
Classical smog occurs inA. Cool climateB. Humid climateC. Cool and humid climateD. Hot and humid climate |
| Answer» Correct Answer - 3 | |
| 591. |
Statement-1: Classical smog occurs in cool and humid climate. and Statement-2 It is also termed as oxidising smog.A. Statement-1: is True, Statement-2 is True, Statement-2 is a correct explanantion for Statement-1B. Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1C. Statement:1 is True, Statement -2 is FalseD. Statement-1 is False, Statement-2 is True |
| Answer» Correct Answer - C | |
| 592. |
A factory was started near a village. Suddenly villagers started feeling the presence of irriting vapour in the village and cases of headache, chest pain, cough, dryness of throat and breathing problems increased. Villagers blamed the emissions from the chimney of the factory for such problems. Explain what colud have happend. Give chemical reactions for the support of your explanation. |
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Answer» The available information suggests that coal contaminated with sulphur was used in the factory as a fuel. Sulphur got oxidised to both `SO_(2)` and `SO_(3)`. `S(s)+O_(2)(g)rightarrowSO_(2)(g), SO_(2)(g)+1//2O_(2)(g)rightarrowSO_(3)(g)` The oxidation of sulphur dioxide into sulphur trioxide is enhanced by the particulate matter. Both these gases are extremely poisonous and irritating.They cause all those problems that were experienced by the villagers. |
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| 593. |
What are the chief pollutants of the atmosphere which are most likely to deplete the ozone layerA. Carbon dioxideB. Nitrogen oxide and fluorocarbonsC. Sulphur dioxideD. Carbon monoxide |
| Answer» Correct Answer - B | |
| 594. |
Which one of the following gases can deplete ozone layer in the upper atmosphereA. AmmoniaB. MethaneC. Carbon monoxideD. Sulphur dioxide |
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Answer» Correct Answer - B Methane (hydrocarbons), aerosols, freon gas and nitrogen oxide destroy ozone layer in upper atmosphere (stratosphere) |
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| 595. |
Which one of the following statement is no trueA. Oxides of sulphur, nitrogen and carbon are the most widespread air pollutantB. pH of drinking water should be between 5.5-9.5C. Concentration of DO below 6 ppm is good for the growth of fishD. Clean water would have a BOD value of less than 5 ppm |
| Answer» Correct Answer - C | |
| 596. |
Biological treatment of water pollution is done with the help ofA. PhytoplanktonB. LichensC. FungiD. None of the above |
| Answer» Correct Answer - A | |
| 597. |
In the treatment of waste water discharge, which treatment stage involves biological treatmentA. Primary treatmentB. Secondary treatmentC. Tertiary treatmentD. Reverse osmosis stage |
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Answer» Correct Answer - B During waste water treatment Primary treatment involves physical process of removing the suspended matters. Secondary treatment involves biological treatment Tertiary treatment involves the removal of phosphate, nitrate and sulphate |
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| 598. |
The gas emitted by supersonic jet planes that slowly depletes the ozone layer isA. COB. NOC. `SO_2`D. `O_2` |
| Answer» Correct Answer - B | |
| 599. |
The proposal to ban supersonic jet planes in Russia is because (A) They travel with very high speed (B) It is dangerous to travel in them (C) Their exhaust gases react with ozoneA. A & BB. BC. CD. A |
| Answer» Correct Answer - 3 | |
| 600. |
`DDT` isA. Green house gasB. Degradable poolutantC. Nondegradable pollutantD. None of the above |
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Answer» Correct Answer - C DDT is a non biodegradable pollutant |
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