46
A coal that softens and fuses on heating is
1
classified
2
carbonised
3
caking
4
non-caking
47
The calorific value is highest for
1
producer gas
2
water gas
3
coke-oven gas
4
blast-furnace gas
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
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
View Answer
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is obsolete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
View Answer
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
View Answer
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
View Answer
Answer: non-luminous zone
55
When coal is heated in absence of air, it is called
1
deoxidation
2
gasification
3
coalification
4
carbonisation
View Answer
56
Which is the most commonly used molten metal for cooling of nuclear reactor?
1
Calcium
2
Sodium
3
Mercury
4
Zinc
View Answer
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
View Answer
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
View Answer
59
Absorption ofS03 in 97%H2S04 is
1
exothermic
2
endothermic
3
not possible
4
Non of the above
View Answer
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
View Answer
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