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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.
| 401. |
Which of the following is a water polluting factorA. SmokeB. Industrial wasteC. DetergentD. Ammonia |
| Answer» Correct Answer - B | |
| 402. |
Which one of the following is not used for disinfection of drinking waterA. ChlorineB. OzoneC. ChloramineD. Phenyl |
| Answer» Correct Answer - D | |
| 403. |
Montreal Protocol which calls for appropriate action to protect the ozone layer from human activities was passed in the yearA. 1988B. 1986C. 1985D. 1987 |
| Answer» Correct Answer - D | |
| 404. |
Green muffler is used against which type of pollutionA. SoilB. WaterC. AirD. Noise |
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Answer» Correct Answer - D Large green plants are planted in high noise pollution zone because they have capacity to absorb sound waves and these green plants for checking noise pollution are known as green muffler. |
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| 405. |
Which one is the most toxic ?A. CarbonB. COC. `CO_(2)`D. `SO_(2)` |
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Answer» Correct Answer - B CO is more toxic than carbon `CO_(2) and SO_(2)` |
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| 406. |
BOD isA. Biological oxygen deficitB. Biosphere oxygen demandC. Biological oxygen demandD. None of the above |
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Answer» Correct Answer - B B.O.D is biological oxygen demand |
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| 407. |
Which of the following is the coldest region of atmosphereA. ThermosphereB. TroposphereC. MesosphereD. Stratosphere |
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Answer» Correct Answer - C The coldest region is mesophere (temp. `-27^(@)C` to `-92^(@)C`). |
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| 408. |
Which of the following is the coldest region ?A. TroposphereB. MesosphereC. StratosphereD. Thermosphere |
| Answer» Correct Answer - B | |
| 409. |
`DO` value of a water sample is 6 ppm. Calculate the weight of dissolved oxygen present in 100 kg of water sample. |
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Answer» `DO` value 6 ppm means, `10^(6) g` of water contains 6g of dissolved oxygen. `10^(6) g` water `rarr 6g O_(2)` `100kg (10^(5) g)` water `rarr (6xx10^(5))/(10^(6))=0.6 g` Amount of dissolved oxygen in water `=0.6 g`. |
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| 410. |
Water of often treated with chlorine toA. Increase oxygen contentB. Kill germsC. Remove suspended particlesD. Remove hardness |
| Answer» Correct Answer - B | |
| 411. |
The permissible available chlorine in treated water should be `0.25 mg L^(-1)`. Bleaching powder to be added into `1000L` tank for the permissible chlorine should beA. `0.45g`B. `0.25g`C. `45.0g`D. `4.50g` |
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Answer» Correct Answer - A Avilable chlorine is due to bleaching powder. `underset(127g)(CaOCl_(2))+H_(2)O Rarr Caunderset(71g)((OH)_(2))+Cl_(2)` `0.25mgL^(-1)` `0.25 g//1000L` `Cl_(2)` requried in `1000L` tank = `0.25xx1000` `=250g` `=0.25mg` `71 g ` of `Cl_(2)` is from `= 127g CaOCl_(2)` `0.25g` of `Cl_(2)` is from `=(127xx0.25)/(71) = 0.45g`. |
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| 412. |
Water of often treated with chlorine toA. Increase oxygen contentB. Kill germsC. Remove harnessD. Remove suspended particles |
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Answer» Correct Answer - B Water is often treated with chlorine to kill germs |
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| 413. |
Mottling of teeth is due to presence of an element in drinking waterA. MercuryB. FluorineC. BoronD. Chlorine |
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Answer» Correct Answer - B Mottling of teeth is due to the presence of fluorine in drinking water |
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| 414. |
As it passes into food chain the concentration of DDTA. Reamins sameB. DecreasesC. IncreasesD. Unpredicatable |
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Answer» Correct Answer - C As DDT passes in to food chain its concentrtion increases |
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| 415. |
500 ml of a sample `COD` of water required 19.6 mg of `K_(2)Cr_(2)O_(7)` of water sample isA. 8 ppmB. 6.4 ppmC. 16.8 ppmD. 4.9 ppm |
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Answer» Correct Answer - 2 `19.6xx10^(-3) g K_(2)Cr_(2)O_(7) …… 500 ml` of `H_(2)O ?......... 10^(6) ml` of `H_(2)O` `49g` of `K_(2)Cr_(2)O_(7)=8g` of `O_(2)` `39.2 g` of `K_(2)Cr_(2)O_(7) =?` `COD=6.4` ppm |
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| 416. |
The `COD` value of a water sample is 40 ppm. Calculate the amount of acidified `K_(2) Cr_(2) O_(7)` required to oxidise the organic matter present in 500 ml of that water sample. |
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Answer» `COD` value is 40 ppm. It means `10^(6) g` of water sample require `40 g` of oxygen to oxidise the organic matter in it. `500` water `rarr (40xx500)/10^(6)=2xx10^(-2) g` of `O_(2)` `500` mL water sample requires `2xx10^(-2) g` of `O_(2)` to oxidise the organic matter present in it. `2xx10^(-2) g` of `O_(2) equiv (49xx2xx10^(-2))/(8) g` of `K_(2)Cr_(2)O_(7)` Amount of `K_(2) Cr_(2) O_(7)` required to oxidise the organic matter present in the water sample is `0.1225 g`. |
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| 417. |
Which of the following statement is not true about classical smog?A. Its main components are produced by the action of sunlight on emission of automobiles and factoriesB. Produced in cold and humid climateC. It contains compounds of reducing natureD. It contains smoke, fog and sulphur dioxide. |
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Answer» Correct Answer - A smog are of two types-classical smog and photochemical smog. Classical amog occurs in cold humid climate. It is a mixture of smoke, fog and sulphur dioxide. Chemical it is a reducing mixture that’s why, it is also called as reducing smog. |
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| 418. |
Choose the correct statement regarding photochemical smog.A. It occurs in warm, dry and sunny climate.B. It mainly results from the action of sunlight on unsaturated hydrocarbons and nitrogen oxides produced by automobiles and factories.C. It has high concentration oxidising agents.D. All of the above |
| Answer» Correct Answer - D | |
| 419. |
Which one of the following statements is correctA. Extensive use of chemical fertilizers may lead to eutrophication of nearby water bodiesB. Both Azotobacter and Rhizobium fix atmospheric nitrogen in root nodules of plantsC. Cyanobacteria such as Anabaena and Nostoc are important mobilizers of phosphates and potassium for plant nutrition in soilD. At present it is not possible to grow maize without chemical fertilizers |
| Answer» Correct Answer - C | |
| 420. |
Foul smell in the water of tanks, ponds etc. is due toA. AnaerobiosisB. AcrobiosisC. Biological magnificationD. Psammophytes |
| Answer» Correct Answer - A | |
| 421. |
Sewage sludge does not containA. NitrogenB. PhosphorusC. PotassiumD. All of these |
| Answer» Correct Answer - C | |
| 422. |
Green chemistry emphasizes onA. Reaction that takes place in non-aqueous mediumB. Utilization of science to reduce adverse impact on environment.C. Use of condensation polymersD. Minimise the use of non-hazardous waste. |
| Answer» Correct Answer - B | |
| 423. |
Assertion : The process in which nutrient rich water bodies develop plant population is called eutrophication. , Reason : Eutrophication helps in enhancement of plants and animals population by providing them oxygen.A. If both assertion and reason are true and reason is the correct explanation of assertion.B. If both assertion and reason are true but reason is not the c orrect explanation of assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false. |
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Answer» Correct Answer - c Eutrophication kills animal life by depriving it of oxygen and results in subsequent loss of biodiversity. |
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| 424. |
Assertion : Soluable fluoride is often added to drinking water to bring its concentration up to 1 ppm. Reason : `F^(-)` ion concentration above 2 ppm causes brown mottling of teeth.A. If both assertion and reason are true and reason is the correct explanation of assertion.B. If both assertion and reason are true but reason is not the c orrect explanation of assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false. |
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Answer» Correct Answer - b `F^(-)` ions make the enamel on teeth much harder by converting hydroxyapatite, the enamel on the surface of the teeth, into much harder fluorapatite ` [ 3 ( Ca_(3) (PO_(4)) _(2)) .Ca (OH)_(2)], ` the enamel on the surface of the teeth , into much harder fluorapatite ` [ 3 (Ca_(3) (PO_(4))_(2)).CaF_(2)].` |
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| 425. |
Which of the following is the uppermost region of the atmosphere ?A. StratosphereB. TroposphereC. ExosphereD. ionosphere |
| Answer» Correct Answer - C | |
| 426. |
Which of the following is not considered to be a pollutant ?A. `NO_2`B. `CO_2`C. `O_3`D. `C_x H_y` |
| Answer» Correct Answer - B | |
| 427. |
Which one is not correct statement redarding minimuzing environmental pollution?A. Manures and biofertilizers should be used in place of chemical fertilizers.B. All nuclear tests to be stopped.C. Green belts in cities should be developedD. Domestic garbage must be burnt |
| Answer» Correct Answer - 4 | |
| 428. |
The maximum allowed concentration in ppm of zinc in drinking waterA. `5.0`B. `0.05`C. `3.0`D. `0.2` |
| Answer» Correct Answer - 3 | |
| 429. |
The acceptable level of lead in drinking water in ppm isA. 150B. 250C. 50D. 80 |
| Answer» Correct Answer - 3 | |
| 430. |
Lead (P) causesA. Radioactive pollutionB. Air pollutionC. Soil pollutionD. All of the above |
| Answer» Correct Answer - B | |
| 431. |
Radioactive strontium as a result of radioactive fall out, isA. `Sr^85`B. `Sr^90`C. `Sr^80`D. `Sr^95` |
| Answer» Correct Answer - B | |
| 432. |
Which of the following is not a part of green chemistry?A. PhotochemistryB. SonochemistryC. Nuclear chemistryD. Biochemistry |
| Answer» Correct Answer - C | |
| 433. |
Which of the following isnot correctly matched?A. `{:("Column I","Column II"),("Photochemical smog","Warm dry climate"):}`B. `{:("Column I","Column II"),("Photochemical smog","Contains" SO_(2)):}`C. `{:("Column I","Column II"),("Classical smog","Cool humid climate"):}`D. `{:("Column I","Column II"),("Classical smog","Reducing smog"):}` |
| Answer» Correct Answer - B | |
| 434. |
Assertion (A) : The medium which is afffected by the pollutant is receptor Reason (R) : The medium which reacts with pollutants is sink.A. A & BB. B & CC. C & AD. A, B & C |
| Answer» Correct Answer - 4 | |
| 435. |
The chemical entities present in thermosphere of the atmosphere areA. `O_(2)^(+), O^(+), NO^(+)`B. `O_(3)`C. `N_(2), O_(2), CO_(2), H_(2)O`D. `O_(3), O_(2)^(+), O_(2)` |
| Answer» Correct Answer - 1 | |
| 436. |
An example of chemical toxics isA. removing water from industrial reactionsB. utilizing ammonial instead of vinegarC. eleminating the formation of chlorinated organics paperD. storing BPA (Bis-phenla A) in plastic bottles |
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Answer» Correct Answer - C If production of chlorinated organics as `CFCs-(CF_(2)Cl_(2)` freons) is prevented, there are less chances of depletion of ozone layer. |
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| 437. |
A water sample has ppm level concentration of following anions `F^(-)=10 , SO_4^(2-)=100 , NO_3^(-)=50` The anion/anions that make/makes the water sample unsuitable for drinking is/areA. only `F^-`B. only `SO_4^(2-)`C. only `NO_3^-`D. both `SO_4^(2-)` and `NO_3^(-)` |
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Answer» Correct Answer - A Acceptable level of `F^-` is upto 1 ppm, `NO_3^-` is upto 50 ppm and `SO_4^(2-)` is upto 500 ppm `F^-` concentration in water sample is 10 ppm which is higher than the permissible level. Therefore, only `F^-` makes the water sample unsuitable for drinking |
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| 438. |
The concentration of fluoride, lead, nitrate and iron in a water sample from an underground lake was found to the 1000 ppb, 40 ppb, 100 ppm and 0.2 ppm respectively. This water is unsuitable for drinking due to high concentration ofA. fluorideB. leadC. nitrateD. iron |
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Answer» Correct Answer - C In drinking water, maximum permissible concen tration (tolerable limits) of different chemicals are Fluoride (1 ppm), lead (50 ppb), nitrate (50 ppm) and iron (0.2 ppm). As the given sample of water contain higher concentration of nitrate ions (100 ppm) than the permissible limit of 50 ppm, therefore, given sample of water is unsuitable for drinking. Excess of nitrate ions causes a disease called methemoglobinemia |
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| 439. |
A water sample has ppm level concentration of following anions `F^(-)=10 , SO_(4)^(2-)=100 , NO_(3)^(-) =50` the anion/anions that make/makes the water sample unsuitable for drinking is/areA. only `NO_(3)^(-)`B. both `SO_(4)^(2-)` and `NO_(3)^(-)`C. only `F^(-)`D. only `SO_(4)^(2-)` |
| Answer» Correct Answer - C | |
| 440. |
The concentration of fluoride, lead, nitrate and iron in a water sample from an underground lake was found to be 1000 ppb,40 ppb,100 ppm and 0.2 ppm, respectively. This water is unsuitable for drinking due to high concentration ofA. fluorideB. leadC. nitrateD. iron |
| Answer» Correct Answer - C | |
| 441. |
How many of the following in dinking water below 30 ppm do not cause any effect on the body as per international standards of water? `Pb^(2+), Hg^(2+), Mn^(2+), Cd^(2+), Cl^(-), NO_(3)^(-), SO_(4)^(2), Ca^(2+), Mg^(2+)`A. 5B. 2C. 3D. 6 |
| Answer» Correct Answer - 1 | |
| 442. |
What are X and Y in the following reaction? `CF_(2)Cl_(2) overset(UV)(rarr) X+Y`A. `.^(*)CF_(2)Cl^(*), Cl`B. `.^(*)C_(2)F_(4), Cl_(2)`C. `.^(*)CFCl_(2)^(*), F`D. `C Cl_(2), F_(2)` |
| Answer» Correct Answer - 1 | |
| 443. |
Major pollution causing agent isA. ManB. Hydrocarbon gasesC. AnimalsD. None of the above |
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Answer» Correct Answer - A Because he made factories, automobiles etc. which is most polluting |
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| 444. |
Which one is not a correct statement?A. Primary pollutants are those which are emitted directly from the sourceB. Acid rain is primary pollutantC. Particulates refer to all atmospheric substances that are not gasesD. All of these |
| Answer» Correct Answer - B | |
| 445. |
Pollution isA. removal of top soilB. release of toxic`//`undersirable material in enviromentC. conservation of energyD. all the above |
| Answer» Correct Answer - B | |
| 446. |
Name three gases which are the major source of pollution. |
| Answer» Carbon monoxide (CO), sulphur dioxide `(SO_(2))`and of nitrogen `(NO_(x))`are the major source of environmental pollution. | |
| 447. |
Burning of fossil fuels is the main source of which of the following pollutants?A. Nitric oxideB. Carbon monoxideC. Sulphur dioxideD. Particulate matter |
| Answer» Correct Answer - C | |
| 448. |
Burning of fossil fuels is the main source of which of the following pollutants?A. Nitrogen oxideB. Nitric oxideC. Nitrous oxideD. sulphur dioxide |
| Answer» Correct Answer - D | |
| 449. |
If the organic content in water is high, the type of chlorination to be adopted isA. double chlorinationB. breakdown chlorinationC. SuperchlorinationD. post-chlorination |
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Answer» Correct Answer - C Superchlorination effectively destroys organisms. It is also effective when water is highly polluted. |
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| 450. |
Higer incidents of heart diseases in smokers is related to high content ofA. `CO_(2)`B. `CO`C. `H_(2)O`D. `CN^(-)` |
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Answer» Correct Answer - B Due to smoking, `CO` goes into heart and combines with haemoglobin of blood. Thus, `O_(2)` releasing tendency is decreased. `HbO_(2)+CO rarr HbCO+O_(2)(K=200)`. |
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