Chemical Engineering Questions and Answers for Competitive Exams SSC UPSC Railways | GkSeries

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46 A coal that softens and fuses on heating is
1 classified
2 carbonised
3 caking
4 non-caking

Answer: caking
47 The calorific value is highest for
1 producer gas
2 water gas
3 coke-oven gas
4 blast-furnace gas

Answer: coke-oven gas
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48 Addition of a non-volatile solute to a solvent produces a in its solvent.
1 freezing point elevation
2 boiling point depression
3 vapour pressure lowering
4 None , of the above

Answer: vapour pressure lowering
49 Recycling in a chemical process facilitates
1 increased yield
2 enrichment of product
3 heat conservation
4 All of the above

Answer: All of the above
50 Deaeration of water in its treatment is necessary as it
1 minimises its turbidity
2 helps in controlling its taste and odour
3 minimises its corrosiveness
4 None of the above

Answer: minimises its corrosiveness
51 The most widely and commonly used coagulant for removal of suspended impurities in water is
1 bleaching powder
2 slaked lime
3 alum
4 copper sulphate

Answer: alum
52 Contact process
1 yields acid of higher concentration than chamber process
2 yields acid of lower concentration than chamber process
3 is obsolete
4 eliminates absorber

Answer: yields acid of higher concentration than chamber process
53 Bromine is used in the preparation of
1 fire extinguishing compounds
2 fireproofing agents
3 dyes and antiknock compounds
4 All of the above

Answer: All of the above
54 The hottest part of a flame lies in its
1 non-luminous zone
2 luminous zone
3 yellow zone
4 zone of unburnt gases

Answer: non-luminous zone
55 When coal is heated in absence of air, it is called
1 deoxidation
2 gasification
3 coalification
4 carbonisation

Answer: carbonisation
56 Which is the most commonly used molten metal for cooling of nuclear reactor?
1 Calcium
2 Sodium
3 Mercury
4 Zinc

Answer: Sodium
57 Turbulent flow generally occurs in cases involving
1 highly viscous fluid
2 very narrow passages
3 very slow motion
4 None of the above

Answer: None of the above
58 Cement mainly contains
1 CaO, Si02, A1203
2 MgO, Si02, K20
3 A1203, MgO, Fe203
4 CaO, MgO, K20

Answer: CaO, Si02, A1203
59 Absorption ofS03 in 97%H2S04 is
1 exothermic
2 endothermic
3 not possible
4 Non of the above

Answer: exothermic
60 Which form of energy source has the highest potential in Assam compared to all States of India?
1 Wind power
2 Solar power
3 Hydropower
4 Biomass power

Answer: Hydropower

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