Which synthetic fiber was first discovered?
- (A) Polycot
- (B) Rayon
- (C) Nylon
- (D) Polyester
- (C) Nylon
The first synthetic fiber made by man was:
- (A) Rayon
- (B) Nylon
- (C) Polyester
- (D) Terracotta
- (B) Nylon
Which of the following gases is lighter than air?
- (A) Ammonia
- (B) Carbon dioxide
- (C) Oxygen
- (D) Chlorine
- (A) Ammonia
Which gas is used in fire extinguishers?
- (A) Neon
- (B) Carbon dioxide
- (C) Water vapor
- (D) Carbon monoxide
- (B) Carbon dioxide
Which substance is used in match sticks?
- (A) Sulfur
- (B) Zinc
- (C) Iron
- (D) Nitric acid
- (A) Sulfur
Which substance is used on the both sides of match boxes?
- (A) Ammonia
- (B) Sulphur
- (C) Phosphorus
- (D) Chlorine
- (C) Phosphorus
Which form of phosphorus is used in safety matches?
- (A) White phosphorus
- (B) Red phosphorus
- (C) Yellow phosphorus
- (D) Black phosphorus
- (B) Red phosphorus
The ______ of a substance changes when it is heated:
- (A) Mass
- (B) Volume
- (C) Weight
- (D) All of these
- (D) All of these
What is the chemical formula of heavy water?
- (A) NH3
- (B) H2O
- (C) D2O
- (D) NaCl
- (C) D2O
Deuterium oxide is the chemical name of:
- (A) Hard water
- (B) Soft water
- (C) Heavy water
- (D) Mineral water
- (C) Heavy water
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