- (A) Grinding
- (B) Machining
- (C) Cutting
- (D) Polishing
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- (A) Grey
- (B) Dark brown
- (C) Red
- (D) Black
- (A) Positively charged
- (B) Negatively charged
- (C) Neutral
- (D) Combination of all
- (A) 80
- (B) 100
- (C) 125
- (D) 150
- (A) Hydrogen
- (B) Carbon dioxide
- (C) Ozone
- (D) None of these
- (A) Mercury
- (B) Lead
- (C) Fluoride
- (D) Arsenic
- (A) Acts as a green house gas thereby raising earth’s temperature
- (B) Causes asphyxia
- (C) Causes increase in sea level
- (D) Enhances the green house effect
- (A) Coagulation
- (B) Filtration
- (C) Anion exchanger
- (D) Preheating it
- (A) 1
- (B) 7
- (C) 19
- (D) 82
- (A) Hydrogen
- (B) Acetylene
- (C) Carbon monoxide
- (D) Ammonia
