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.
| 101. |
Which one of the following is least persistent insecticide?A. AldrinB. DieldrinC. BHCD. Carbamates |
| Answer» Correct Answer - D | |
| 102. |
Assertion (A) : The lower the concentration of `DO`, the the more polluted is the water sample. Reason (R) : Oxygen is consumed by microbes for the decomposition of organic matter present in water.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 | |
| 103. |
Oxygen plays a key role in troposphere while ozone in the stratosphere. Elaborate. |
| Answer» Oxygen is needed for the various biological activities that are taking place in the troposphere. Ozone present in the stratosphere absorbs U.V. rediations emitted from sun and does not allow them to react our planet i.e., earth. In case, they do so, they are likely to create havoc resulting in large number of diseases. | |
| 104. |
Assertion (A) : Atmosphere plays an important role in maintaining the heat balance on earth. Reason (R) : Atmosphere absorbs a portion of electromagnetic coming from the sun and transmits near UV, visible and near IR radiation.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 | |
| 105. |
Assertion: `CO_(2)` present in the atmosphere absorbs heat radiated from heat radiated from earth in the form of `IR` radiations. Reason: `CO_(2)` is a pollutant.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 - C Correct Reason: `CO_(2)` is not a pollutant but its high concentration is responsible for greenhouse effect. |
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| 106. |
Formation of London smog takes place inA. Winter during day timeB. winter during morig timeC. Summer during day timeD. Summer during morning time |
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Answer» Correct Answer - B London smog is formed in morning during winter. |
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| 107. |
The minimum level of a pollutant above which a healthy individual worker is adversely affected on exposure to it for 8 hrs in a day is calledA. Critical limit valueB. Toxic limit value (TLV)C. Threshold limit valueD. Dangerous limit value |
| Answer» Correct Answer - 3 | |
| 108. |
Man dies in the atmosphere of `CO` becauseA. It combines with the `O_(2)` present in the body to form `CO_(2)`B. It combines with the haemoglobin of blood making it incapable of absorbing `O_(2)`C. It reduces the organic matter of tissuesD. It dries up the blood |
| Answer» Correct Answer - 2 | |
| 109. |
Which of the following is a secondary pollutant ?A. `CO_2`B. `N_2O`C. `SO_2`D. PAN |
| Answer» Correct Answer - D | |
| 110. |
Secondary pollutant which stops Hill reaction isA. AldehydesB. Nitric acidC. Peroxyacetyl nitrate (PAN)D. Sulphuric acid |
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Answer» Correct Answer - C PAN prevents photolysis of water in photosynthesis or hill reaction |
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| 111. |
Which one of the following is a secondary pollutant?A. `CO`B. `O_(3)`C. PbD. `CH_(4)` |
| Answer» Correct Answer - B | |
| 112. |
Which of the following is a secondary pollutantA. `NO_2`B. `CO`C. `O_3`D. `SO_2` |
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Answer» Correct Answer - C Ozone `(O_3)` is secondary pollutants which is formed by the interaction of primary air pollutants. |
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| 113. |
Which of the following is a secondary pollutantA. COB. `CO_(2)`C. PAND. Aerosol |
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Answer» Correct Answer - C PAN is a secondary pollutant |
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| 114. |
Which of the following is a secondary air pollutant?A. `CO`B. HydrocarbonsC. PAND. `NO` |
| Answer» Correct Answer - 3 | |
| 115. |
About `20km` above the earth ,there is an ozone layer ,Which one of the following statement about ozone and ozone layer is true?A. Ozone layer is beneficial to us because ozone cuts out the ultraviolet radiation of the sunB. The convertion of ozone to oxygen is an endothermic reaction.C. Ozone is a triatomic linear molecularD. Ozone layer is harmful to us because it cuts out a radiation useful for photosynthesis. |
| Answer» Correct Answer - A | |
| 116. |
Ozone is a gas hevier than air. Wy does ozone layer not settle down near the earth ? |
| Answer» Ozone layer as we know, gets formed in the stratosphere at a high altitude (25-30 km)away from the surface of earth. At this altitude. There is no effect of force of gravitation of earth. As a result, ozone layer does not settle. | |
| 117. |
The consequences of global warming may bea)increase in average temperature of the earthb)melting of Himalayan Glaciers.c)increased biochemical oxygen demand.d)increased biochemical oxygen demand.A. A, DB. A, CC. A, BD. A, B, C |
| Answer» Correct Answer - 3 | |
| 118. |
The consequences of global warming may beA. increase in average temperature of the earthB. melting of Himalayan Glaciers.C. increased biochemical oxygen demand.D. eutrophication. |
| Answer» Correct Answer - 1, 2 | |
| 119. |
Why does green house effect cause global warming ? What could be the consequences of global warming ? |
| Answer» A green house behaves just like a glass or plastic roof. It allows the heat from the sun to enter but at the same time checks it from escaping in the outer atmosphere. In other words, gaseous atmosphere around the earth traps the heat tesulting in global warming. For consequences of global warming, | |
| 120. |
The consequences of global warming may bea)increase in average temperature of the earthb)melting of Himalayan Glaciers.c)increased biochemical oxygen demand.d)increased biochemical oxygen demand.A. increase in average temperature of the earthB. melting of Himalayan GlaciersC. increased biochemical oxygen demandD. Eutrophication |
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Answer» Correct Answer - A::B It the rate at which solar radiation are arriving the earth remain constant but the amount `CO_(2)` in the air increaes. The heat radiated back to the earth will increase consequently. The temperature of the earth surface will increase. This increase in temperature will disturb the thermal balance on the earth and could car glaciers and ice caps to melt. |
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| 121. |
The consequences of global warming may bea)increase in average temperature of the earthb)melting of Himalayan Glaciers.c)increased biochemical oxygen demand.d)increased biochemical oxygen demand.A. increase in average temperature of the earthB. melting of Himalayan Glaciers.C. increased biochemical oxygen demand.D. eutrophication. |
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Answer» Correct Answer - A::B Both can occur as a result of global warming. |
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| 122. |
How can you apply green chemistry for the following ? (a) To control photochemical smog. (b) To avoid use of halogenated solvents in dryclening and that of chlorine in bleaching. (c ) to reduce use of synthestic detergents. (d) To reduce the consumption of petrol and diesel. |
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Answer» (i) To study the role of Green Chemistry in controlling photochemical smog, (ii) N/A (iii) Soaps are better than detergents since they are biodegradable unlike detergents. Some soft detergents are also availble which are also biodegradable. (iv) These days CNG (condensed natural gas) is commonly used in place of petrol and diesel. It causes less pollution problems. |
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| 123. |
Which of the following statements about photochemical smog is wrong ?A. It has concentration of oxidising agentsB. It has low concetration of oxdising agentC. It can be controlled by controlling the release `NO_(2)`, hydrocarbon, ozone etc.D. Plantation of some plants like pinus helps in controlling phochemical smog |
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Answer» Correct Answer - B Photochemical smog or Los Angles somg was first observed in Los angles in 1950. It is formed due to photochemical reactions taking place when air contain `NO_(2)` and hydrocarbons. The concentration produce irritation in the eyes. Photochemical smog has high concentrationi of oxidants such as `O_(3)`, organic oxident etc. |
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| 124. |
The consequences of global warming may be ______A. increase in average temperature of the earthB. melting of Himalayan GlaciersC. increased biochemical oxygen demandD. eutrophication |
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Answer» Correct Answer - A::B Due to global warming average temperature of the earth increases and melting of Himalayan glaciers occurs |
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| 125. |
Name the two acids that are present in acid rain. |
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Answer» Acid rain contains `H_(2)CO_(3). HNO_(3)` and `H_(2)SO_(4). H_(2)CO_(3)` is formed by the dissolution of `CO_(2)` of the air in which the water vapour present. `CO_(2) + H_(2)O rarr H_(2)CO_(3)` Forest fire and lighting are the natural sourc of nitric oxide `(NO)`. Nitrogen oxides are also produced by combusion engines, aircraft furnaces, incinerators, industrial plants. Nitric oxide slowly reacts with atmospheric air and produce `NO_(2).NO_(2)` dissolves in water to form `HNO_(3)`. `3NO_(2) + H_(2)O hArr 2HNO_(3) + NO` Sulphur oxides are produced by the burning of fossil and in extraction of metals from their sulphide ores etc. Sulphur dioxide also produces sulphuric acid in the similar way. `SO_(2) + H_(2)O overset("Soot particles")underset("Metal oxides")rarr H_(2)SO_(4) + [O]` |
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| 126. |
Which of the following statement is tre about ozone layer?A. It is harmful because ozone is dangerous to living organism.B. It is benefixial because oxidation reaction can proceed faster in the presence of ozone.C. It is beneficial because ozone cuts off the ultraviolet radiation of the sun.D. It is harmful because ozone cuts out the important radiation of the sun which are vital for photosysnthesis. |
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Answer» Correct Answer - C Ozone layer absorbs the UV radiation coming from the sun and save the earth. |
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| 127. |
The acids present in acid rain are ______A. PeroxyacetylnitrateB. `H_2CO_3`C. `HNO_3`D. `H_2SO_4` |
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Answer» Correct Answer - B::C::D The acids present in acid rain are `H_2CO_3 , HNO_3` and `H_2SO_4` |
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| 128. |
The two strong acids present in the acid rain areA. `HNO_(2) and HNO_(3)`B. `H_(2)SO_(4)and HNO_(3)`C. `H_(2) SO_(3) and H_(2)SO_(4)`D. `H_(2)CO_(3) and HCl` |
| Answer» Correct Answer - B | |
| 129. |
Smog is common pollutant in places having:A. high altitudesB. high temperatureC. high concentration of `SO_(2)` in airD. high concentration of `NH_(3)` in air |
| Answer» Correct Answer - C | |
| 130. |
Smog is a common pollutant in places havingA. Excessive `SO_2` in the airB. Low temperatureC. High temperatureD. Excessive ammonia in the air |
| Answer» Correct Answer - B | |
| 131. |
Why is London smog formed in winter while photochemical smog is formed in summer? |
| Answer» London smog is formed due to condensation of sulphuric acid droplets (formed from `SO_2`) on the surface of the particulates which takes place in cold weather while photochemical smog is initiated by the photolysis of `NO_2` which takes place in presence of bright sunlight | |
| 132. |
Assertion : Classical smog is oxidising smog whereas photochemical smog ie reducing smog. Reason : Classical smog occurs in warm, dry and sunny climate whereas photochemical smog occurs in cool humid climate .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 - d Classical smog occurs in cool humid climate. Chemically it is a reducing mixture and so it is also called as reducing smog Photochemical smog occurs in warm , dry and sunny climate. It has concentration of oxidising agents and is therefore, called as oxidising smog. |
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| 133. |
`{:("List - I","List - II"),("(A) Troposphere","(i) Prevents UV rays coming to earth"),("(B) Stratosphere","(ii) Ionizaton of gases"),("(C) Mesosphere","(iii) Maintenance of heat balance"),("(D) Thermosphere","(iv) Non propagation of sound waves"):}` The correct match isA. `{:("(A)","(B)","(C)","(D)"),("(ii)","(iv)","(iii)","(i)"):}`B. `{:("(A)","(B)","(C)","(D)"),("(iv)","(ii)","(i)","(iii)"):}`C. `{:("(A)","(B)","(C)","(D)"),("(iii)","(i)","(iv)","(ii)"):}`D. `{:("(A)","(B)","(C)","(D)"),("(i)","(iii)","(ii)","(iv)"):}` |
| Answer» Correct Answer - C | |
| 134. |
Consider the following statements : (i) Zirconium - alizarins due is used for testing fluoride ions is water (ii) Ozone layer is present in mesosphere (iii) the poisonous gas present in the exhaust fumes of automobiles is Co (iv) Taj Mahal is affected by `CO_(2)` gas The correct statement areA. (i) and (iii)B. (i),(ii) ,(iii)C. (i),(iii) and (iv)D. all of these |
| Answer» Correct Answer - A | |
| 135. |
Identify the correct statements., (i) Winter smog is reducing in nature due to presence of particular carbon and `SO_(2)` (ii)The pollutant obtained from emission tubes of diesel engines is benzopyrene. (iii) Photochemical smog is made up of PAN , `O_(3)` and oxides of nitrogen (iv) CFCs are stable in troposphere and act as pollutants in stratosphereA. (ii),(iii) and (iv)B. (i),(iii)and (iv)C. (i), (ii) and (iii)D. all of these |
| Answer» Correct Answer - D | |
| 136. |
Assertion (A) : Alkylated mercury is more toxic than mercury. Reason (R) : The toxicity of the pollutant depends upon the nature of speciation.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 | |
| 137. |
BOD stands forA. Biological organism deathB. Biochemical organic matter decayC. Biotic oxidation demandD. Biochemical oxygen demand |
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Answer» Correct Answer - D BOD `prop` Water pollution |
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| 138. |
A dental disease characterised by mottling of teeth is due to presence of a certain chemical clement in drinking water. Which is that elementA. BoronB. ChlorineC. FluorineD. Mercury |
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Answer» Correct Answer - C The excess of fluorine in water causes fluorosis. The symptoms of fluorosis are motting of teeth (yellowish streaks ) and abnormal bones liable to fracture etc. It is an example of endemic disease. |
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| 139. |
The amount of oxygen used by micro organisms present in water for five days at `20^(@)C` is calledA. `COD`B. `DO`C. `TLV`D. `BOD` |
| Answer» Correct Answer - 4 | |
| 140. |
Four samples of water A, B, C and D have the `DO` values 1 mg / litre, 3 mg /litre, 5 mg / litre and 8 mg/litre respectively. The more polluted sample of water isA. AB. BC. CD. D |
| Answer» Correct Answer - 1 | |
| 141. |
Organic pollution in water is measured byA. `P^(H)`B. SalinityC. `COD`D. `DO` |
| Answer» Correct Answer - 3 | |
| 142. |
Among the following the region of atmosphere containing ozoneA. TroposphereB. ThermosphereC. MesosphereD. Stratosphere |
| Answer» Correct Answer - 4 | |
| 143. |
The presence of ozone `(O_3)` in the atmosphere of earthA. Hinders higher rate of photosynthesisB. Helps in checking the penetration of ultraviolet rays to earthC. Has been responsible for increasing the average global temperature in recent yearsD. Is advantageous since it supplies `O_2` for people travelling in jets |
| Answer» Correct Answer - B | |
| 144. |
Sewage containing organic waste should not be disposed in water bodies because it causes major water pollution. Fishes in such a polluted water die because ofA. Large number of mosquitoes.B. Increase in the amount of dissolved oxygen.C. Decrease in the amount of dissolved oxygen in water.D. Clogging of gills by mud. |
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Answer» Correct Answer - C is the correct answer |
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| 145. |
High concentration of Fluoride is poisonous and harmful to bones and teeth at levels overA. 1 ppmB. 3 ppmC. 5 ppmD. 10 ppm |
| Answer» Correct Answer - D | |
| 146. |
Sewage containing organic waste should not be disposed in water bodies because it causes major water pollution. Fishes in such a polluted water die because ofA. larger number of mosquitoesB. increase in the amount of dissolved oxygenC. decrease in the amount of dissolved oxygen in waterD. clogging of gills by mud |
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Answer» Correct Answer - C If the concentration of dissolved oxygen in water is below 6 ppm, the growth of fish gets inhibited . |
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| 147. |
Sewage containing organic waste should not be disposed in water bodies because it causes major water pollution. Fishes in such a polluted water die because ofA. Large number of mosquitoesB. Increase in the amount of dissolved oxygenC. Decrease in the amount of dissolved oxygen in waterD. Clogging of gills by mud |
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Answer» Correct Answer - C Organic waste consumes oxygen .As a result , the dissolved oxygen in water decreases and fish in such water die |
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| 148. |
Which cause death of fish in water bodies polluted by sewage?A. Decrease in D.OB. Increase in D.OC. Decrease in C.O.DD. All the above |
| Answer» Correct Answer - 1 | |
| 149. |
Saline solid contains (A) High concentration of Salt (B) Lot of moisture (C) Hard rocksA. AB. A & BC. B & CD. A, B, C |
| Answer» Correct Answer - 1 | |
| 150. |
Water polluted by toxic metals and their compounds cause (A) Cancer (B) Diarrhoea (C) Skin diseaseA. A & BB. B & CC. C & AD. A, B, C |
| Answer» Correct Answer - 4 | |