Which gas in air is necessary for burning process?
- (A) Oxygen
- (B) Argon
- (C) Carbon dioxide
- (D) Nitrogen
- (A) Oxygen
Which process is used in obtaining charcoal from wood?
- (A) Oxidation
- (B) Destructive distillation
- (C) Carbonation
- (D) Fractional distillation
- (B) Destructive distillation
Among the various allotrope of carbon _______ is the hardest.
- (A) Diamond
- (B) Coke
- (C) Lamp black
- (D) Graphite
- (A) Diamond
Among the various allotrope of carbon _______ is the softest.
- (A) Coke
- (B) Diamond
- (C) Graphite
- (D) Lamp black
- (C) Graphite
The best quality of coal with least ash content is:
- (A) Lignite
- (B) Peat
- (C) Anthracite
- (D) Bituminous
- (C) Anthracite
The variety of coal in which the deposit contains recognizable traces of the original plant material is:
- (A) Bitumen
- (B) Peat
- (C) Anthracite
- (D) Lignite
- (B) Peat
Which gases are used in different type of welding?
- (A) Acetylene and Oxygen
- (B) Oxygen and Hydrogen
- (C) Butane and Propane
- (D) Hydrogen and Nitrogen
- (A) Acetylene and Oxygen
The metal used in printing press is an alloy of:
- (A) Lead and Copper
- (B) Lead and Zinc
- (C) Lead and Antimony
- (D) Lead and Bismuth
- (C) Lead and Antimony
At what point is the Celsius and Fahrenheit scale equal?
- (A) 10°C
- (B) -10°C
- (C) 40°C
- (D) -40°C
- (D) -40°C
The property of a substance to absorb moisture from the air on exposure is called:
- (A) Osmosis
- (B) Desiccation
- (C) Deliquescence
- (D) Efflorescence
- (C) Deliquescence
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