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162311. A substance used in metallurgy to remove rock material is called
A
fluxB
gangueC
matrixD
slagCorrect Answer: A. flux
162412. The compound that can not be kept in glass vessel because it reacts with glass is
A
HFB
FIBrC
HNO3D
HCICorrect Answer: A. HF
162513. Whose presence in drinking water is welcome?
A
AsB
FeC
KD
CaCorrect Answer: C. K
162614. Phosgene is a common name of
A
PhosphineB
Carbonyl chlorideC
Phosphorus trichlorideD
Phosphorus oxychlorideCorrect Answer: B. Carbonyl chloride
162715. The purest form of iron is
A
Iron turningB
Cast ironC
Wrought ironD
Stainless steelCorrect Answer: C. Wrought iron
162816. Radioactive decay of uranium produces
A
LeadB
TinC
ArsenicD
BismuthCorrect Answer: A. Lead
162917. Washing soda is the common name for
A
Sodium bicarbonateB
Sodium hydroxideC
Sodium carbonateD
Calcium carbonateCorrect Answer: C. Sodium carbonate
163018. In the process of vulcanization which two of the following are heated together?
A
Rubber and SteelB
Rubber and LeadC
Rubber and SulphurD
Latex and SulphurCorrect Answer: C. Rubber and Sulphur
163119. When a liquid is heated from 20°C to 60°C, its density
A
DecreasesB
Is lostC
Remains the sameD
IncreasesCorrect Answer: A. Decreases
163220. Equal volumes of different gases at any definite temperature and pressure have
A
equal densityB
equal number of moleculesC
equal weightsD
equal massesCorrect Answer: B. equal number of molecules
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