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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.
| 801. |
In a sewage treatment plant, primary treatment isA. Physical process which involves sedimentation onlyB. Physical process which involves both filtration any sedimentationC. Biological process which involves formations of primary sludge and effluentD. Biological process which involves both filtration and sedimentation |
| Answer» Correct Answer - 2 | |
| 802. |
The primary treatment of sewage involesA. Sludge digestionB. Aerobic bacterial activityC. Anaerobic bacterial activityD. Filtration and sedimentation |
| Answer» Correct Answer - D | |
| 803. |
Large holes in Swiss cheese are formed due to production of large amount of `CO_(2)` byA. PropionibacteriumB. MyobacteriumC. SaccharomycesD. Penicillium |
| Answer» Correct Answer - A | |
| 804. |
A person was admitted to a hospital as he had myocardial infarction. A cardiologist injected him streptokinase. WhyA. It reduces hypertensionB. It reduces level of blood cholesterolC. It stimulates heart beatD. It acts as clot buster |
| Answer» Correct Answer - D | |
| 805. |
Streptokinase is used forA. Treating bacterial diseasesB. Preparation of cheeseC. Clearing blood clotsD. Clearing fruit juices |
| Answer» Correct Answer - C | |
| 806. |
Select the correct statement from the followingA. Biogas is produced by the activity of aerobic bacteria on animal wasteB. Methanobacterium is an aerobic bacterium found in rumen of cattle.C. Bigas, commonly called gobar gas, is pure methaneD. Activated sludge-sediment in settlement tanks of sewage treatment plant is a rich source of aerobic bacteria |
| Answer» Correct Answer - D | |
| 807. |
Activated sludge should have the ability to settle quickly so that it canA. Be rapidaly pumped back from sedimentation tank to aeration tankB. Absorb pathogenic bactria present in waste water while sinking to the bottom of the settiling tankC. Be discarded and anaerobically digestedD. Absorb colloidal organic matter |
| Answer» Correct Answer - A | |
| 808. |
BOD of waste water is estimated by measuring the amount ofA. total organic matterB. biodegradable organic matterC. oxygenD. oxygen consumption |
| Answer» Correct Answer - D | |
| 809. |
BOD of waste water is estimated by measuring the amount ofA. total organic matterB. biodegradable organic matterC. oxygen evolutionD. oxygen consumption |
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Answer» Correct Answer - D BOD (Biochemical Oxygen Demand) refers to the amount of the oxygen that would be consumed if all the organic matter in one litre of water were oxidised by bacteria. Other options (a) (b) and (c) are incorrect. |
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| 810. |
BOD of waste water is estimated by measuring the amount ofA. Total organic matterB. Biodergadable organic matterC. Oxygen evolutionD. Oxygen consumption |
| Answer» Correct Answer - D | |
| 811. |
The primary treatement of wastewater involves the removal ofA. stable particlesB. toxic substanceC. harmful bacteriaD. activated impurities |
| Answer» Correct Answer - A | |
| 812. |
BOD of waste water is estimated by measuring the amount ofA. oxygen evolutionB. total organic matterC. oxygen consumptionD. biodegradable organic matter |
| Answer» Correct Answer - C | |
| 813. |
Activated sludge should have the ability to settle quickly so that it can :A. be rapidly pumped back from sedimentation tank to aeration tankB. absorb pathogenic bacteria present in waste water while sinking to the bottom of the settling tankC. be discarded and anaerobically digestedD. absorb colloidal oraganic matter |
| Answer» Correct Answer - A | |
| 814. |
What would happen if oxygen availability to activated sludge flocs is reduced ?A. It will slow down the rate of degradation of organic matterB. The centre of flocs will bocome anoxic , which would cause death of bacteria and eventually breakage of flocsC. Flocs would increase in size as anaerobic bacteria would grow around flocsD. Protozoa would grow in large numbers |
| Answer» Correct Answer - B | |
| 815. |
What would happen if oxygen availability to activated sludge flocs is reduced ?A. It will slow down the rate of degradation of organic matterB. The center of floes wi!I become anoxic, which would cause death of bacteria and eventually breakage of floesC. Floes would increase in size as anaer- obic bacteria would grow around floes.D. Protozoa would grow in large numbers |
| Answer» Correct Answer - b | |
| 816. |
What would happen if oxygen availability to activated sludge flocs is reduced?A. It will slow down the rate of degradation of organic matterB. The centre of flocs will become anoxic, which would cause death of bacteria and eventually breakage of flocsC. Flocs would increase in size as anaerobic bacterial would grow around flocsD. Ptotozoa would grow in large numbers |
| Answer» Correct Answer - B | |
| 817. |
What would happen if oxygen availability to activated sludge flocs is reduced?A. It will slow down the rate of degradation of organic matterB. The centre of flocs will bocome anoxic , which would cause death of bacteria and eventually breakage of flocsC. Flocs would increase in size as anaerobic bacteria would grow around flocsD. Protozoa would grow in large numbers |
| Answer» Correct Answer - B | |
| 818. |
What would happen if oxygen availability to activated sludge flocs is reduced ?A. I will slow down the rate of degradation of organic matterB. The center of flocs will become anoxic, which would cause death of bacteria and eventually breakage of flocsC. Flocs would increase in size an anaerobic bacterial would grow around flocsD. Protozoa would grow in large numbers |
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Answer» Correct Answer - B Activated sludge microorganisms need oxygen as they oxidise wastes to obtain energy for growth. Insufficient oxygen will slow down or kill off aerobic microorganisms, make facultative organisms work less efficiently and ultimately lead to the breakage of flocs. It will also result in the production of the foul-smelling byproducts of anaerobic decomposition. So, sufficient oxygen must always be maintained in the aeration tank to ensure complete waste stabilisation. |
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| 819. |
What would happen if oxygen availability to activated sludge flocs is reduced ?A. It will slow down the rate of degradation of organic matterB. The centre of flocs will become anoxic, which would cause death.C. Flocs would increase in size as anaerobic bacteria would grow around flocsD. Protozoa would grow in large numbers. |
| Answer» Correct Answer - B | |
| 820. |
Mycorrhiza does not help the host plant inA. Enhancing its phosphorus uptake capacityB. Increasing its tolerance to droughtC. Enhancing its resistance to root pathogensD. Increasing its resistance to insects. |
| Answer» Correct Answer - D | |
| 821. |
Brown Plant Hopper isA. Nilparvata lugensB. Calliphora erythrophalaC. Helizoverpa armigeraD. Schistocerea gregaria |
| Answer» Correct Answer - A | |
| 822. |
An organism used as biofertilizer for raising soyabean crop is Or Most famous nitrogen fixing bacterium/biofertilizer isA. AzospirillumB. RhizobiumC. NostocD. Azotobacter |
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Answer» Correct Answer - B Rhizobium leguminosarum is a symbiotic bacteria found in root nodules of legume . This bacterium has nitrogen fixing nif gene. Soyabean is a legume. Thus, Rhizobium is used as a biofertiliser for raising soyabean crop. |
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| 823. |
An organism used as a biofertilizer for raising soyabean crop is:-A. NostocB. AzotobacterC. AzospirillumD. Rhizobium |
| Answer» Correct Answer - 4 | |
| 824. |
An organism used as a biofertilizer for raising soyabean crop is:-A. AzotobacterB. ZospirillumC. RhizobiumD. Nostoc |
| Answer» Correct Answer - C | |
| 825. |
An organism used as biofertilizer for raising soyabean crop is Or Most famous nitrogen fixing bacterium/biofertilizer isA. NitrobacterB. NitrosomonasC. NitrococcusD. Rhizobium |
| Answer» Correct Answer - D | |
| 826. |
A free-living nitrogen-fixing cyanobacterium which can also form symbiotic association with the water fern Azolla is :A. ChlorellaB. NostocC. AnabaenaD. Tolypothrix |
| Answer» Correct Answer - 3 | |
| 827. |
Which one is a biofertiliser ?A. NPK mixtureB. Rhizobia in legume rootsC. Rhizobia in farmyard manureD. Green manure |
| Answer» Correct Answer - B | |
| 828. |
Azolla is used as biofertilizer as it hasA. RhizobiumB. CyanobacteriaC. MycorrhizaD. Large quantity of humus |
| Answer» Correct Answer - B | |
| 829. |
A free-living nitrogen-fixing cyanobacterium which can also form symbiotic association with the water fern Azolla is :A. AnabaenaB. NostocC. ChlorellaD. Tolypothrix |
| Answer» Correct Answer - A | |
| 830. |
Azolla enriches rice fields with nitrogen due to its association with Or A free living nitrogen fixing cyanobacterium which can also form symbiotic association with the water fern Azolla isA. AnobaenaB. NostocC. AzospirillumD. Rhizobium |
| Answer» Correct Answer - A | |
| 831. |
(A) : HIV is a retrovirus. (R) : It can synthesis DNA and RNA.A. If both (A) and (R) are true and (R) is the correct explanation of (A).B. If both (A) and (R) are true but (R) is not the correct explanation of (A).C. If (A) is true but (R) is false.D. If both (A) and (R) are false. |
| Answer» Correct Answer - A | |
| 832. |
What gases are produced in anaerobic sludge digestresA. Hydrogen Sulphide and `CO_2`B. Methane and `CO_2` onlyC. Methane, Hydrogen Sulphide and `CO_2`D. Methane, Hydrogen Sulphide and `O_2` |
| Answer» Correct Answer - 3 | |
| 833. |
If we need to protect our crops from mosquitoes then we can useA. Ladyibird beetleB. DragonfliesC. Bacillus thuringiensisD. Both A and B |
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Answer» Correct Answer - B If we need to protect our crops from mosquitoes then we can use dragonflies. |
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| 834. |
A peculiar odour that occurs in marshy areas and cowsheds is due t gas produced byA. CyanobacteriaB. ArcheabacteriaC. MycoplasmeD. Slime Moulds |
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Answer» Correct Answer - B A peculiar odour that occurs in marshy areas and cowsheds is due to gas produced by archaebacteria. |
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| 835. |
Which of the following statements is/are correct ?A. In paddy fields, cyanobacteria serve as an important biofertiliser.B. Vermicompost consists of organic metter prepared by the action of earthworms on human or animal waste.C. The important examples of cyanobacteria as biofertilisers are Anabaena, Nostoc and Oscillatoria.D. All of these |
| Answer» Correct Answer - D | |
| 836. |
Methanogens do not produceA. oxygenB. methaneC. hydrogensulphideD. carbon dioxide |
| Answer» Correct Answer - a | |
| 837. |
Study the following statements and select the correct ones (i) Methanogens are archeabacteria which produce methane in marshy areas (ii) Nostoc is a filamentous blue green alga which fixes atmospheric nitrogen. (iii) Many membres of the genus Glomus form my corrhiza.A. (i) and (ii)B. (i) and (iii)C. (ii) and (iii)D. (i),(ii) and (iii) |
| Answer» Correct Answer - D | |
| 838. |
A biofertilizer isA. Cyanobacterium Anabaena in cavities of Azolla leavesB. Symbiotic associtation of Azotobacter for fixing atmospheric nitrogenC. Farmyard manureD. Green manure |
| Answer» Correct Answer - A | |
| 839. |
Fungus used in preparation of soya sauce, shoyu isA. Rhizopus oryzaeB. Penicillium glaucumC. Aspergillus oryzaeD. Mucor javanicus |
| Answer» Correct Answer - B | |
| 840. |
Which is not a contact poisonA. DDTB. BHCC. EndrinD. Lead arsenate |
| Answer» Correct Answer - D | |
| 841. |
which of the following product is not obtained from fermented soya sauce ?A. TempehB. TofuC. SufuD. Dosa |
| Answer» Correct Answer - D | |
| 842. |
An association between roots of higher plants and fungi calledA. MossB. FernC. LichenD. Mycorrhiza |
| Answer» Correct Answer - D | |
| 843. |
Fungus used in preparing soy sauce isA. AgaricusB. AspergillusC. PenicilliumD. Saccharomyces |
| Answer» Correct Answer - B | |
| 844. |
Which of the following statement for sewage is correct?A. Municipal waste-water, whose major component is human excretaB. Contains large amount of organic matter and non-pathogenic microbesC. Can be discharged directly into natural water bodies like rivers and streamsD. It is generated in less quantities in cities and villages as compared to towns |
| Answer» Correct Answer - 1 | |
| 845. |
Methanogenic bacteria are not found inA. rumen of cattleB. gobar gas plantC. activated sludgeD. bottom of waterlogged paddy fields |
| Answer» Correct Answer - C | |
| 846. |
ganga action plan for controlling pollution in ganga started inA. 1985B. 1981C. 1987D. 1989 |
| Answer» Correct Answer - 1 | |
| 847. |
ganga action plan for controlling pollution in ganga started inA. 1985B. 1981C. 1987D. 1989 |
| Answer» Correct Answer - A | |
| 848. |
Ganga Action Plan Yamuna Action Plan has intiated byA. Indian Agricultural Research Institue (IARI)B. Khadi and village Industries Commission (KVIC)C. The Ministry of Environment and Forests(MOEF)D. Both A and B |
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Answer» Correct Answer - C Ganga Action Plan and Yamuna Action Plan has intiated by the Ministry of Environment and Forests (MOEF). |
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| 849. |
Which species of Penicillium produces Roquefort cheese? |
| Answer» Requefort cheese is formed by ripening of cheese with the fungi Penicillium roqueforti for a particular flavour. | |
| 850. |
(A) : Donkeys cannot withstand adverse weather conditions. (R) : They need much care and attention.A. If both (A) and (R) are true and (R) is the correct explanation of (A).B. If both (A) and (R) are true but (R) is not the correct explanation of (A).C. If (A) is true but (R) is false.D. If both (A) and (R) are false. |
| Answer» Correct Answer - D | |