Which gas is produced during ripening of bananas?
- (A) Methane
- (B) Ethane
- (C) Butane
- (D) Propane
- (B) Ethane
Mixing of which material makes rubber more flexible?
- (A) Marble powder
- (B) Sulphur
- (C) Graphite
- (D) Potassium permanganate
- (B) Sulphur
When glucose and fructose combine they produce:
- (A) Starch
- (B) Cellulose
- (C) Sucrose
- (D) Lipids
- (C) Sucrose
Soldering of two metals is possible because of the property of:
- (A) Viscosity
- (B) Osmosis
- (C) Surface tension
- (D) Cohesion
- (D) Cohesion
Iron and steel structure are damaged by:
- (A) Carbon monoxide
- (B) Sulphur dioxide
- (C) Ammonia oxide
- (D) Hydro chloride
- (A) Carbon monoxide
Almost all metals are solid except:
- (A) Zinc
- (B) Mercury
- (C) Gold
- (D) Silver
- (B) Mercury
The density of water at 4°C is:
- (A) 1 gcm-3
- (B) 2 gcm−3
- (C) 3 gcm−3
- (D) 4 gcm−3
- (A) 1 gcm-3
Which of the following substance is highly plastic?
- (A) Mica
- (B) Clay
- (C) Granite
- (D) Quartz
- (B) Clay
Which of the following is a chemical change?
- (A) Bending of iron
- (B) Tempering of iron
- (C) Rusting of iron
- (D) Melting of iron
- (C) Rusting of iron
Freezing point of water at sea level is:
- (A) 0°C
- (B) 2°C
- (C) 3°C
- (D) 4°C
- (A) 0°C
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