InterviewSolution
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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.
| 151. |
A fertile soil is likely to have a pH ofA. 3B. 9C. `6-7`D. 14 |
| Answer» Correct Answer - 3 | |
| 152. |
Untreated domestic sewage has a lowA. BOD valueB. `%` of dissolved `O_(2)`C. Amounts of dissolved saltsD. `%` of suspended organic matter |
| Answer» Correct Answer - 2 | |
| 153. |
Bioamplification is due toA. Increase in the concentration of pesticides in waterB. Gradual accumulation of pestivides from lower animals to higher animalsC. Gradual decrease in concentration of pesticides in `H_(2)O`D. Increase in space of biosphere |
| Answer» Correct Answer - 2 | |
| 154. |
Eutrophication in lakes takes place due toA. Excess of dissolved `O_(2)`B. Increase in soil pHC. Large concentrations of phosphate nutrients in waterD. Dissolved fluorides |
| Answer» Correct Answer - 3 | |
| 155. |
Consider the following statements about water pollutants. (I) Disease causing pollutants are called pathogens (II) They are bacteria and other organisms that enter water from domestic sewage and animal excreta. (III) Gastrointestinal diseases are caused by Streptococcus faecalis and Escherichia coli bacteria present in human excreta. Correct option(s) is`//`are.A. onlyIIIB. Both II and IIIC. Both I and IID. I, II and III |
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Answer» Correct Answer - D All of the given statement about pathogens are correct. |
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| 156. |
Domestic waste mostly constitute:A. Non biodegradable pollutionB. Biodegradable pollution EffluentsC. EffluentsD. Air pollution |
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Answer» Correct Answer - B Domestic waste mostly constitutes biodegradavble pollution |
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| 157. |
Domestic waste containsA. ToxicpollutantsB. Non- biodegradable pollutantsC. Biodegradable pollutantsD. Both biodegradable and non-biodegradable pollutants |
| Answer» Correct Answer - 4 | |
| 158. |
Smog can be controlled byA. Use of catalytic converts in automobilesB. setting the air-fule ratio in engine in such a way to produce some `CO` and unburnt hydrocarbonsC. both (a) and (b)D. None of these |
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Answer» Correct Answer - C Smog is due to unburnt hydrocarbons which are oxidized to `RCHO` and `RCOR` which in turn combines with `NO_(2)` forming `PAN` (peroxyancetyrate, `RCO_(3)NO_(2))`. If catalytic converters are used in automobiles, and ratio of air and Fuel is in a ratio to release `CO` and unburnt hyforcarbons in small amount , then smog formation is controlled. |
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| 159. |
Domestic waste mostly constitute:A. Non-biodegradable PollutionsB. biodegradable PollutionC. effluentsD. air pollututions |
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Answer» Correct Answer - B Domestic waste generally contains organic matter which is biodergradable. |
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| 160. |
Increasing skin cancer and high mutation rate are the result ofA. Acid rainB. Ozone depletionC. CO pollutionD. `CO_(2) pollution` |
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Answer» Correct Answer - B Increasing skin cancer and high muitation rate are due to ozone depletion which causes more U.V rays to reach the earth |
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| 161. |
Flsh do not grow as well in warm water as in cold water. Why ? |
| Answer» The amount of dissolved oxygen in warm water is less than in cold water | |
| 162. |
Consider the following statement about different impurities in drinking water.A. Only III is correctB. All but I are correctC. All but II are correctD. I,II and III are correct |
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Answer» Correct Answer - D All of the given statement regarding presence of lead, nitrate and sulphate in drinking water are correct. |
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| 163. |
When solid particles of the size less than 1.0 pm are suspended in air, it is calledA. DustB. SmokeC. FumeD. Fly ash |
| Answer» Correct Answer - C | |
| 164. |
Very fine suspended and colloidal impurities are removed by a process calledA. softeningB. cosgulationC. disinfectionD. plain sedimantation |
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Answer» Correct Answer - B Colloidal particles are charged. They can be removed from water by addition of electrolytes, called coagulation. |
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| 165. |
Formation of acid from polluting oxides involves :A. catalytic oxidationB. hydrolysisC. both (a) and (b)D. hydration |
| Answer» Correct Answer - C | |
| 166. |
The viable particulate among the following isA. AlgaeB. SmokeC. MistD. Fume |
| Answer» Correct Answer - 1 | |
| 167. |
Which of the following is a sink for `CO`?A. AnimalsB. Microbes in soilC. OceansD. Plants |
| Answer» Correct Answer - 2 | |
| 168. |
Which of the following acts as a sink for CO?A. PlantsB. HaemoglobinC. OcceansD. Microorganism present in the soil |
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Answer» Correct Answer - D `CO` is converted to `CO_(2)` by microorganism present I soil. |
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| 169. |
Increasing the concentration of accumulated pollutant along food chain is along food chain isA. EutrophicationB. BioamplificationC. Chemical amplificationD. Biological pollution |
| Answer» Correct Answer - 2 | |
| 170. |
Which one of the following statement is false ?A. Photochemical smog causes irritation in eyesB. London smog is a mixture of smoke and fogC. Photochemical smog results in the formation of PAND. London smog is oxidising in nature |
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Answer» Correct Answer - D (d) is false as London smog is reducing in nature. |
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| 171. |
Which of the following is the greenest solvent?A. FormaldehydeB. BenzeneC. waterD. Ethanol |
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Answer» Correct Answer - C Water is universal and greenest solvent is pure state, it has zero effect on enviroment. |
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| 172. |
Which of the following is a sink for CO ?A. HaemoglobinB. Microorganism present in the soilC. OceansD. Plants |
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Answer» Correct Answer - B Microorganisms present in the soil act as a sink for CO. |
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| 173. |
Lakes containing excess of bacterial nutrients calledA. Polluted lakesB. Eutrophic lakesC. Fertile lakesD. Green lakes |
| Answer» Correct Answer - 2 | |
| 174. |
The pollutant isA. Leakage of `MIC`B. Oil spills from shipsC. Carbon monoxideD. Leakage of `Cl_(2)` |
| Answer» Correct Answer - 3 | |
| 175. |
Contaminant isA. `SO_(2)`B. `COCl_(2)`C. `Pb`D. Methyl isocyanate |
| Answer» Correct Answer - 4 | |
| 176. |
Beyond which minimum concentration of `F^(-)` water becomes useless for drinking purposeA. 10 ppmB. 5 ppmC. 2 ppmD. 20 ppm |
| Answer» Correct Answer - 3 | |
| 177. |
Which of the following statements are correct (A) Carbamates are nerve toxins (B) diethanol amine is an environment friendly herbicide (C) Fly ash is a contaminent in air due to thermal power plants and steel industry (D) Haemoglobin of the blood forms carboxy haemoglobin with `CO` The correct answer isA. A, B, CB. B, C, DC. A, B, DD. A, B, C, D |
| Answer» Correct Answer - 4 | |
| 178. |
Which of the following is a herbicide?A. `NaClO_(3)`B. `Na_(2)SO_(4)`C. `Na_(3)AsO_(4)`D. `NaCl` |
| Answer» Correct Answer - 1 | |
| 179. |
Which of the following is not a herbicide?A. Sodium chlorateB. Sodium arseniteC. PolyphosphateD. Triazines |
| Answer» Correct Answer - C | |
| 180. |
The figure showns how the emission of pollutants is related to the air`//`fuel ratio in an internal comustion engine using octance `C_(8)H_(18)` . Select the correct statement(s). A. Excess air leads to high `NO(g)` levelsB. Unburnt and partially burnt hydrocarbons lead to high `RH` and `CO` levelC. Stoichiometric ratio of air to fuel (on a mass basis) is about `14.5:1` if air contains `24% O_(2)`D. All of the above |
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Answer» Correct Answer - D (a) As from figure , NO`(g)` content is high when air content is high-correct. (b) When gasoline is unburnt of partially burnt, it means air to fuel ratio is not stoichiometrically , hence content of `CO` and `C_(18)H_(18)` is high-correct. (c ) `underset(1mol e 114g)(C_(8)H_(18))+underset(12.5 mol es 400g O_(2))(12.5O_(2)) rarr 8CO_(2)+9H_(2)O` `(400)/(0.24)g air = 1667g` Ratio of air of fuel = `14.6:1` |
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| 181. |
In stratosphere, which of the following radical retards the formation of `O_(3)`?A. `overset(.)CH_(3)`B. `overset(.)Cl`C. `overset(.)F`D. `Cl_(2)` |
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Answer» Correct Answer - B `overset(.)(C)l` radical obtained from `CFCs` reacts with `O_(3)` present in stratosphere. `CF_(2)Cl_(2)(g) overset(UV)(rarr) overset(.)(C )(g) + CF_(2)overset(.)(C )l(g)` `overset(.)(C )l(g)+O_(3)(g) rarr Cl overset(.)(O)(g)+O_(2)(g)` `Cl overset(.)(C )l(g)+O_(3)(g) rarr Cl overset(.)(O)(g)+O_(2)(g)(O)(g)+O(g) rarr overset(.)(C )l(g)+O_(3)(g) rarr Cl overset(.)(O)(g)+O_(2)(g)(C )ll(g)+O_(2)(g)`. |
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| 182. |
In a coal fired power plant electrostatic precipitators are installed to control emission ofA. `SO_2`B. `NO_x`C. SPMD. CO |
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Answer» Correct Answer - C SPM `to` Suspended Particulates Matter |
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| 183. |
High concentrations of gas retards that the rate of photosynthesisA. `CO_(x)`B. `NO_(x)`C. `SO_(x)`D. `ClO_(x)` |
| Answer» Correct Answer - 3 | |
| 184. |
Which of the following is most poisonousA. COB. `CO_2`C. `C`D. `SO_2` |
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Answer» Correct Answer - A In human beings , carbon monoxides causes headache and difficulty in breathing . The haemoglobin has greater affinity to CO than oxygen. The Hb.CO reduces the oxygen carrying capacity of haemoglobin |
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| 185. |
Catalytic converters used to reduce the effect of exhaust fumes from vehicles contains the coating of metal over ceramic hiney comb.A. `Zn`B. `Pt`C. `Cu`D. `Al` |
| Answer» Correct Answer - 2 | |
| 186. |
Acrosols reduce primary productivity byA. Destroying leaf tissueB. Premature leaf fallC. Reducing crop yieldsD. All of these |
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Answer» Correct Answer - D Aerosol is produced by jet aeroplanes, trucks and other vehicles . It can decrease the growth and productivity of plant and also cause abscission of leaves. |
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| 187. |
Cause of eutrophication isA. Nutrient enrichment of water bodiesB. Increase of oxygen in water bodiesC. Increase in number of aquatic organismsD. All of these |
| Answer» Correct Answer - A | |
| 188. |
Acid rain is harmful forA. agricultureB. aquatic ecosystemC. building made of marble or metalD. All of these |
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Answer» Correct Answer - D (a) Acid rain decreases soil fertility due to leaching out of plant nutrients. (b) Due to acid rain, `pH` value of some lakes and streams decreases (and sometimes falls below 3), at which fishes are adversely affected and some varieties are even killed. Dissolution of toxic metals (`Cd,Pb,Al,etc.`) from bottom sediments affect fish and drinking water. (c ) Acid rain corrodes buildings made of marble and metals. Marble `(CaCO_3)` is badly affected by `H_(2)SO_(4)` (of acid rain). `CaCO_(3) + H_(2)SO_(4) rarr CaSO_(4)+H_(2)P+CO_(2)` Metals (especially `Fe`) is also affected by acid rain and causes rusting. `Fe+2H^(+) rarr Fe^(2+)+H_(2)` Taj mahal is made of marble `(CaCO_(3))` and is being affected by acid rain. |
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| 189. |
The uppermost region of the atmosphere isA. StratosphereB. exosphereC. troposhereD. ionosphere |
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Answer» Correct Answer - B Exosphere is the uppermost region of the atmosphere. |
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| 190. |
Green chemistry means such reactions whichA. are related to depletion of ozone layerB. reduce the use and production of hazardous chemicalsC. produce green colour in reactionsD. study the reaction in plants |
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Answer» Correct Answer - B Green chemistry implies to reduce the use and production of hazardous chemicals. |
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| 191. |
Which of the following statement about sewage treatment is false?A. In primary treatment, large sized particles are filtered through screen and residual water is subjected to sedimentationB. Coagulation can be carried out by passing ozone through waste waterC. In tertiary treatment, the waste water is treated with lime to remove phosphate following by coagulationD. Secondary treatment involves aerobic digestion of the organic waste. |
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Answer» Correct Answer - B Coagulation can be carried out by adding alum and ferric choride in waste water. |
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| 192. |
Eutrophication cause reduction inA. Dissolved oxygenB. Dissolved saltsC. All the aboveD. |
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Answer» Correct Answer - B Euthrophication causes reduction of dissolvbed oxygen |
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| 193. |
Which of the following statement is not true?A. `pH` of drinking water should be between 5.5 and 9.5B. Concentration of `DO`below 6ppm is good for the growth of fishC. Clean water would have a `BOD` value of `5ppm`.D. oxdation by air `H_(2)O_(2)` and `O_(3)` |
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Answer» Correct Answer - B The ideal value of `DO` for growth of fishes is `8mg//L. 7mg//L` is desirable range, below this value fishes get susceptible to disease. A value of `2 mg//L` or below is lethal for fished. |
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| 194. |
Carbon monoxide is harmful to human beings as itA. is carcinogenicB. is antagonistic to `CO_(2)`C. has higher affinity for haemoglobin as compared to oxygenD. is destructive to `O_(3)` |
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Answer» Correct Answer - C Carbon monoxide is harmful to human beings as it hs higher affinity for haemoglobin as compared to oxygen |
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| 195. |
Drawback of DDT as pesticde isA. It becomes ineffective after some timeB. It is less effective than othersC. It is not easily/rapid degraded in natireD. Its high cost |
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Answer» Correct Answer - C DDT a pessticide is not easily and rapidly degraded in nature |
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| 196. |
Which is not the constituent of photochemical smog?A. `RCHO`B. `RCOR`C. `CF_(2)Cl_(2)`D. `PAN` |
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Answer» Correct Answer - C Photochemical smog contains `RCHO, RCOR, PAN` and `O_(3), CF_(2)Cl_(2)` cause depletion of ozone layer and is not responsible for photochemical smog. |
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| 197. |
`DDT` isA. greenhouse gasB. biodegradable PollutantC. Non-biodegradable PollutantsD. none of above |
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Answer» Correct Answer - C `DDT` is non-biodegradable pollutant. |
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| 198. |
A person was using water supplied by Municipality. Due to shortage of water the started underground water. He felt laxative effect. What could be the cause ? |
| Answer» The laxative effect is oberseved only when the sulphates presents in water have concentration greater than `500 "ppm"`. Otherwise at moderate levels it is charmless. | |
| 199. |
Which of the following statement is not true about classical smog?A. Its main components are produced by the action of sunlight on emissions of automobilies and factories.B. It is produced in cold and humid climate.C. It contains compounds of reducing nature.D. It contains smoke, fog and sulphur dioxide. |
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Answer» Correct Answer - A Sunlight does not promote chemical smog. |
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| 200. |
Select viable pollutantA. SmokeB. MouldsC. MistD. Fumes |
| Answer» Correct Answer - B | |