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61 Find the odd one out.
1 Digboi Refinery
2 Numaligarh Refinery
3 Guwahati Refinery
4 Bongaigaon Refinery

Answer: Numaligarh Refinery
62 Penetrating index and softening points are determined for
1 gasoline
2 kerosine
3 bitumen
4 gas oil

Answer: bitumen
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63 Mercury is transported in metal containers made of
1 aluminium
2 lead
3 iron
4 nickel

Answer: iron
64 'Sour' crude means the crude oil contains
1 wax
2 paraffins and asphalts
3 nitrogen compounds
4 sulphur compounds

Answer: sulphur compounds
65 Washing soda is
1 Na2C03
2 Na2C03 H20
3 Na2C0310H20
4 NaHCQ3

Answer: Na2C0310H20
66 The main purpose of galvanizing iron sheets is to
1 harden the surface
2 increase the glossiness and luster
3 prevent the action of water
4 prevent the action of oxygen

Answer: prevent the action of water
67 Ammonia synthesis reaction is
1 exothermic
2 endothermic
3 autocatalytic
4 None of the above

Answer: exothermic
68 A material is called ductile if it can be
1 drawn into wire
2 hammered into a thin sheet
3 fractured without deformation
4 made lustrous by heating it

Answer: drawn into wire
69 Which is an amorphous material?
1 Glass
2 Mica
3 Brass
4 Cast iron

Answer: Glass
70 Which of the following is the easiest to crack?
1 Paraffin
2 Olefin
3 Naphthene
4 Aromatic

Answer: Paraffin
71 Laminar flow of a Newtonian fluid ceases to exist, when Reynolds number exceeds
1 4000
2 2100
3 1500
4 3000

Answer: 2100
72 Head developed by a centrifugal pump depends on its
1 speed
2 impeller diameter
3 Both (A) and (B)
4 None of the above

Answer: Both (A) and (B)
73 The most commonly used joint in underground pipeline is the
1 sleeve joint
2 coupling
3 flange
4 expansion joint

Answer: sleeve joint
74 Flow measurement in open channels is done by
1 venturi meter
2 orifice meter
3 weir
4 rotameter

Answer: weir
75 The catalyst used in catalytic reforming is
1 platinum on alumina
2 nickel
3 iron
4 aluminium chloride

Answer: platinum on alumina

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