InterviewSolution
Saved Bookmarks
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.
| 451. |
The green house gas isA. `CO_(2)`B. `SO_(2)`C. `N_(2)`D. `H_(2)S` |
| Answer» Correct Answer - A | |
| 452. |
Which is not a source of pollution ?A. Forest fireB. Coal fireC. VolcanoesD. Dust storm |
| Answer» Correct Answer - D | |
| 453. |
An object is located at a height of 18 km from the surface of earth . The object is located inA. thermosphereB. measosphereC. ionosphereD. stratosphere. |
|
Answer» Correct Answer - D Stratosphere extends from most region of earth atmosphere and hence greatly affected by air pollution . |
|
| 454. |
Which of the following is not a vehicular pollutant ?A. COB. `NO_(2)`C. Particulate matterD. Hydrocarbons. |
| Answer» Correct Answer - D | |
| 455. |
Which of the following does not contribute to water pollution?A. PathogensB. Organic wastesC. chemical pollutantsD. none |
| Answer» Correct Answer - D | |
| 456. |
Photochemical smog can be reduced by :A. using catalytic converted in the automobilesB. plantation of certain plants like pins , juniperus , vits etc.C. both (a) and (b)D. None of these |
| Answer» Correct Answer - C | |
| 457. |
Photochemical smog consists of excessive amount of X in addition to aldehydes, ketones, PAN etc.X isA. methaneB. carbon monoxideC. carbon dioxideD. ozone |
|
Answer» Correct Answer - D Photochemical smog contains excess amount of ozone in addition to aldehydes, ketones and PAN |
|
| 458. |
An object is located at a height of 18 km from the surface of earth. The object is located in :A. thermosphereB. mesophereC. ionosphereD. stratosphere |
| Answer» Correct Answer - D | |
| 459. |
Which of the following process does not increase the amount of `CO_(2)` in atmosphere?A. Decay of animalsB. BreathingC. PhotosynthesisD. Burning of petrol. |
| Answer» Correct Answer - C | |
| 460. |
Which of the following is false?A. Greenhouse gases are carbon dioxide, methane, water vapour nitrous oxide `CFCs` and ozone.B. `CO` is highly poisonous to living beings because of its ability to block the delivery of oxygen to the organs and tissues.C. The troposphere contains dinitrogen, dioxygen, ozone and little water.D. The primary source of air borne lead emission is leaded petrol. |
| Answer» Correct Answer - C | |
| 461. |
Which of the following statements is false?A. over Antarctica, the depletion of ozone layer is due to the formation of chlorine nitrate.B. both `O_(3)` and `NO_(2)` react with unburnt hydrocarbons in the polluted air give `PAN`C. Classical smog consists of a mixture of smog, fog and sulpher dioxide.D. Gaseous pollutants consistas of oxide of carbon, sulphur and nitrogen along with dust, fumes smoke, smog, etc. |
| Answer» Correct Answer - D | |
| 462. |
Freons are not recommended to be used in refrigerators because they causeA. global warmingB. acid rainC. depletion of ozone layerD. very less cooling |
| Answer» Correct Answer - C | |
| 463. |
Why we should not use freons as coolants in refrigerating equipments ? |
| Answer» Freons (chlorofluorocarbons) have a very long life . They stay in the atmosphere for years and ultimately reach the upper layer where they undergo photochemical reaction with ozone.Thus, ozone layer is destroyed producing as ozone hole through which ultraviolet radiation from the sun can pass through and affect life on the earth | |
| 464. |
Assertion (A) : Aldehydes are one of the consituents of photochemical smog. Reason (R) : Aldehydes are produced by photochemical oxidation of hydrocarbons by ozone.A. Both A and R are true and R is the correct explanation of A.B. Both A and R are true but R is not correct explanation of A.C. A is true and R is falseD. A is false and R is true. |
| Answer» Correct Answer - 1 | |
| 465. |
Freons areA. Metal fluoridesB. Poly cyclic fluoridesC. Chlorofluro carbonsD. Iodo bromo carbon |
| Answer» Correct Answer - 3 | |
| 466. |
How are NO and `NO_2` formed in the atmosphere ? |
| Answer» NO is formed due to reaction between `N_2` and `O_2` during lightning or combustion of fossil fuels. It is further oxidized to `NO_2` | |
| 467. |
Which of the following statements is false?A. Lower the concentration of `D.O` the more polluted is the water sample.B. The tolerable limit of lead in drinking water is 50 ppmC. Water is considered pure if it has `BOD` less than 5 ppmD. Microbials are not oxidized by oxidizing agents like `K_(2)Cr_(2)O_(7)` |
| Answer» Correct Answer - 4 | |
| 468. |
which of the following compound belong to the class of freons?A. `CCl_(4)`B. `COCl_(2)`C. `C_(3)O_(2)`D. `CF_(2)Cl_(2)` |
|
Answer» Correct Answer - D Freons are gases named as chlorofluorocarbons `CF_(2)Cl_(2)` etc. |
|
| 469. |
Heat islands are produced due toA. Air pollutionB. Land pollutionC. Water pollutionD. All of the above |
| Answer» Correct Answer - A | |
| 470. |
Bauxite ore and oil wells belongs toA. AtmosphereB. BiosphereC. LithosphereD. Hydrosphere |
| Answer» Correct Answer - 3 | |
| 471. |
Hottest region of the atmosphere isA. MesosphereB. StratosphereC. ThermosphereD. Troposphere |
| Answer» Correct Answer - 3 | |
| 472. |
Which oxide of nitrogen is not common pollutant ?A. `NO_(2)`B. `N_(2)O_(5)`C. NOD. `N_(2)O` |
| Answer» Correct Answer - B | |
| 473. |
Oxides of sulphur and nitrogen are important pollutants ofA. Air and waterB. AirC. WaterD. Soil |
| Answer» Correct Answer - B | |
| 474. |
The following that can cause depletion of ozone isA. `H_(2)S`B. `NO`C. SmokeD. Aqua sols |
| Answer» Correct Answer - 2 | |
| 475. |
Assertion : Chlorine sinks are formed during summer, hence , preventing ozone depletion. Reason : In summer seasons, nitrogen dioxide and methane react with chlorine monoxide and chlorine radicals.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. |
|
Answer» Correct Answer - a During summer, nitrogen dioxide and methane react with chlorine monoxide and chlorine redicals, forming chlorine sinks, preventing much ozone depletion. `Cloverset(.)C_((g))+NO_(2(g))rarrClONO_(2(g))` `overset(.)Cl_((g))+CH_(4(g))rarroverset(.)CH_(3(g))+HCl_((g))` `ClONO_(2(g))+H_(2)O_((g))rarrHOCl_((g))+HNO_(3(g))` `ClONO_(2(g))+HCl_((g))rarrCl_(2(g))+HNO_(3(g))` |
|
| 476. |
Acid rain are due toa)Oxides of Phosphorousb)Oxides of nitrogenc)Oxides of sulphurd)Both 2 & 3A. formation of oxides of sulphurB. formation of oxides of nitrogenC. formation of `H_(2)SO_(4)` and `HNO_(3)`D. All of these |
| Answer» Correct Answer - D | |
| 477. |
Assertion (A) : The oxides of nitrogen and sulphur conbine with rain water and coe down as acid rain. Reason (R) : Acid rains cause depletion of ozone layer.A. Both A and R are true and R is the correct explanation of A.B. Both A and R are true but R is not correct explanation of A.C. A is true and R is falseD. A is false and R is true. |
| Answer» Correct Answer - 3 | |
| 478. |
During an educational trip, a student of botany saw a beautiful lake in a village. She collected many plants from that area. She notices that villagers were washings clothes around the lake and at some places waste material from houses was destroying its beauty. After few years, shw visited the same lake again. She was suprised to find that the lake was covered with algae, stinking smell was coming out and its water had become unusable. Can you explain the reason for this condition of the lake ? |
| Answer» This is explained with the help of process known as Eutrophication. Waste materials and detergents used in washing of clothes contain lot of phosphates in them. The presence of these phosphates in water increases growth of algae. This convers the surface of water in a lake and as a result, oxygen content of water decreases. This leads to anaerobic condiltions resulting in the death of animals and also inhibits the growth of other water animals. Since oxygen is very essential for animal life, in its absence, there is decay and death of animals leading to stinking and foul smell. | |
| 479. |
Choose the biodegradable pollutant out of the following:A. DDTB. Cow dungC. Alkyl benzene sulphonateD. Mercury |
|
Answer» Correct Answer - B Cow dung is a biodegradable pollutant. |
|
| 480. |
Major contributors to acid rain are : (P) `CO_(2)` , (Q) `SO_(2)` (R) `NO_(2)` , (S) `SO_(3)`A. Q and RB. Q onlyC. R and SD. P, Q, R, S |
| Answer» Correct Answer - A | |
| 481. |
Formation of ozone in the upper atmosphere from oxygen takes place by the action ofA. Nitrogen oxideB. Ultraviolet raysC. Cosmic raysD. Free radicals |
|
Answer» Correct Answer - B In presence of `UV` rays `O_(2)` is converted into `O_(3)`. |
|
| 482. |
Spraying of `DDT` produce pollution of the type:A. AirB. Air and waterC. Air and soilD. Air , water and soil |
|
Answer» Correct Answer - D Spraying of DDT produces pollution of air , water and soil |
|
| 483. |
`SO_(2)` and `NO_(2)` produce pollution by increasing:A. AlkalinityB. acidityC. neutralityD. buffer action |
|
Answer» Correct Answer - B `SO_(2)` and `NO_(2)` after oxideation and reaction with water convert into acids. Acids come down from the atmosphere in the form of `H_(2)SO_(4)` , `HNO_(3)`. |
|
| 484. |
`CO` as pollutant can be removed byA. `SO_(2)`B. `I_(2)O_(5)`C. `N_(2)O_(5)`D. All of these |
|
Answer» Correct Answer - B `I_(2)O_(5)` can oxidize `CO` to `CO_(2)` `I_(2)O_(5)+5CO rarr I_(2)+5CO_(2)` `I_(2)` (solid) separates and `CO_(2)` (gas) escape. `SO_(3)` and `N_(2)O_(5)` are also oxidizing agents but products formed `(SO_(2)` and `"NO"_(2))` are also pollutants. |
|
| 485. |
Iron and manganese present in water are removed byA. chlorinationB. aerationC. filtrationD. lime soda treatment |
|
Answer» Correct Answer - B Due to aeration, impurities like `Fe` and `Mn` are oxidized and precipitated, `Fe+O_(2) rarr Fe_(2)O_(3)` `Fe_(2)O_(3)+H_(2)O rarr Fe(OH)_(3) darr` `Mn+O_(2) rarr MnO` `MnO+H_(2)O rarr Mn(OH)_(2) overset([O])(rarr) MnO_(2) darr`. |
|
| 486. |
Aeration of water is done to removeA. Suspended impurityB. dissolved gasesC. dissolved saltsD. floating impurities |
|
Answer» Correct Answer - B Aeration of water promotes taste and removes odour by exchange of gases between the water and the atmosphere. |
|
| 487. |
Photochemical smog always containsA. `SO_(2)`B. `NO`C. `Cl_(2)`D. `NO_(2)` |
| Answer» Correct Answer - B | |
| 488. |
Which of the following statement is not true about classical smog?A. Its main compounds are produced by the action of sunlight on emissions of automobiles and factoriesB. Produced in cold and humid climateC. It contains compounds of reducing natureD. It contains smoke, fog and sulphur dioxide |
| Answer» Correct Answer - 1 | |
| 489. |
Which one of the following is not a property of classical smog?A. Occurs at low temperatureB. Secondary pollutant play significant roleC. Contains `SO_(2)`D. Dark brown coloured |
| Answer» Correct Answer - C | |
| 490. |
Assertion (A) Green house effect was observed in houses used to grow plants and these are made of green glass. Reason (R) Green house name has been given because glass houses are made of green glass.A. Both A and R are correct and R is the correct explanation of AB. Both A and R are correct and R is not the correct explanation of AC. Both A and R are not correctD. A is not correct but R is correct |
|
Answer» Correct Answer - C Both assertion and reason are not correct. In cold countries, sunlight required to grow plants is less. Hence, plants are kept in a house made of glass, palced in such a manner, so that sunlight enters the green house, heat up the soil and plants. The warm soil and plants emit infrared radiations. Since , glass is opaque to infrared radiations, it partly reflects and partily absorbs these radiations. |
|
| 491. |
Assertion: Greenhouse effect was observed in houses used to grow plants and these are made of green glass. Reason: Greebhouse name has been given because glass are of green glass.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 Greenhouse effect was observed in house used to grow plant in colder regions. Since the house were made up of green glasses, these are called green house. |
|
| 492. |
Chlorofluorocarbon releases a chemical harmful to ozone:A. FluorineB. ChlorineC. Nitrogen peroxideD. Sulphur dioxide |
|
Answer» Correct Answer - B Chlorofluorocarbons releases chlorine which is harmful to ozone |
|
| 493. |
Which of the following chemical, harmful to ozone , released by chlorofluorocarbon?A. Sulphur dioxideB. chlorineC. fluorineD. Nitrogen dioxide |
|
Answer» Correct Answer - B `CF_(2)Cl_(2) overset(hv)(rarr)CF_(2)Cl+overset(.)(C ) i` `overset(.)(C )l+O_(3) rarr ClO+O_(2)`. |
|
| 494. |
Which of the following is an excellent green solvent as well as greenhouse gas?A. MethanolB. `CFC(s)`C. `CO`D. `CO_(2)` |
|
Answer» Correct Answer - D `CO_(2)` is an excellent green Solvent as well as greenhouse gas. |
|
| 495. |
The greatest affinity for haemoglobin shown by which of the following ?A. `NO`B. `CO`C. `O_(2)`D. `CO_(2)` |
|
Answer» Correct Answer - A Haenoglobin has great affinity for NO. |
|
| 496. |
Harmful chemical present in tobacco isA. atropineB. nicotineC. tannic acidD. morphine |
|
Answer» Correct Answer - B Harmful chemical present in tobacco is nicotine. |
|
| 497. |
Assertion. CO and NO both combine with hemoglobin Reason. NO has more affinity than CO towards haemoglobin.A. If both Assertion and Reason are true and Reason is the correct explanation of Assertion.B. Both Assertion and Reason are true but Reason is not the correct explanation of AssertionC. If Assertion is true but Reason is falseD. If both Assertion and Reason are false |
|
Answer» Correct Answer - B Both Assertion and Reason are correct but is not the correct explanation of Assertion |
|
| 498. |
Out of `PAN, H_(2)CO_(3),H_(2)SO_(4)` and `HNO_(3)` acid rain containsA. `PAN,H_(2)CO_(3)`B. `H_(2)SO_(4),HNO_(3)`C. `PAN, HNO_(3)`D. `PAN, H_(2)SO_(3)` |
|
Answer» Correct Answer - B Oxides of sulphur and nitrogen, when dissolved in rain water, they are converted into acid and thus are parts of acid rain. `N_(2)O_(5)+H_(2)O rarr 2HNO_(3)` `SO_(3)+H_(2)O rarr H_(2)SO_(4)`. |
|
| 499. |
Assertion : Catalytic converters must be used in cars. Reason : Catalytic converter helps to reduce the formation of acid rain.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. |
|
Answer» Correct Answer - a The exhaust gases containing unburnt fuel, CO, `NO_(x)` when pass through the converter at 573 K, are converted into `CO_(2) and NO_(2)` . |
|
| 500. |
The acids present in acid rain are ______.a)Peroxyacetylnitrateb)`H_(2)CO_(3)`c)`HNO_(3)`d)`H_(2)DO_(4)`A. PeroxyacetylnitrateB. `H_(2)CO_(3)`C. `NHO_(3)`D. `H_(2)SO_(4)` |
|
Answer» Correct Answer - B::C::D `CO_(2)` is slightly soluble in water forming carbonic acid. `CO_(2) + H_(2)O rarr H_(2)CO_(3)` The oxides of nitrogen undergo oxidation reaction followed by reaction with water vapours to form nitric acid `NO + O_(2) rarr 2NO_(2)` `2NO_(2) 6 H_(2)O rarr HNO_(3) + HNO_(2)` The oxidation of `SO_(2)` into `SO_(3)` in presence of dust particles or metal ions. `SO_(3)`. then react with water vapours to fomr `H_(2)SO_(4)` `2SO_(2) + O_(2) overset("Duet particles")underset("or metal ions")rarr2SO_(3)` `SO_(3) + H_(2) rarr H_(2)SO_(4)` |
|