What is the most common salt in sea water?
- (A) Calcium Carbonate
- (B) Potassium Chloride
- (C) Sodium Chloride
- (D) Magnesium Sulphate
- (C) Sodium Chloride
Which of the following is not a chemical reaction?
- (A) Burning of a paper
- (B) Conversion of water into steam
- (C) Digestion of food
- (D) Burning of coal
- (B) Conversion of water into steam
Which is the hardness among following?
- (A) Radium
- (B) Gold
- (C) Diamond
- (D) Graphite
- (C) Diamond
Galvanized iron sheets have on them a coating of:
- (A) Tin
- (B) Zinc
- (C) Lead
- (D) Chromium
- (B) Zinc
Which of the following has the maximum density?
- (A) Water
- (B) Ice
- (C) Benzene
- (D) Chloroform
- (A) Water
What is a mixture of Potassium Nitrate, Charcoal and Sulphur called?
- (A) Paint
- (B) Aluminum
- (C) Brass
- (D) Gunpowder
- (D) Gunpowder
Bell metal is an alloy of:
- (A) Nickel and Copper
- (B) Tin and Copper
- (C) Brass and Nickel
- (D) Zinc and Copper
- (B) Tin and Copper
Isotopes are atoms of the same element with different number of:
- (A) Protons
- (B) Neutrons
- (C) Electrons
- (D) Positrons
- (B) Neutrons
Green House Effect is mainly caused by excess of _______ in the atmosphere.
- (A) Carbon dioxide
- (B) Nitrogen
- (C) Carbon monoxide
- (D) Hydrogen Sulfide
- (A) Carbon dioxide
Which of the following is a man-made material?
- (A) Granite
- (B) Copper
- (C) Plastic
- (D) Methane
- (C) Plastic
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