1.Which of the following acid is used in sour milk?
 A. Acetic acid
 B. Citric acid
 C. Lactic acid
 D. Tartaric acid
 
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2.Diamond and graphite are examples of:
 A. Compounds
 B. Elements
 C. Metal and non-metal
 D. Mixture
 
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3.The best conductor of electricity is:
 A. Copper
 B. Diamond
 C. Platinum
 D. Silver
 
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4.Bohr's atomic model is based on:
 A. Dalton's atomic theory
 B. Law of mass action
 C. Quantum theory
 D. Theory of electrolytic dissociation
 
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5.Which of the following is not a noble gas?
 A. Ar
 B. Kr
 C. Ra
 D. Xe
 
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6.Which of the following is not a chemical change?
 A. Combustion of fuel
 B. Electrolysis of acidified water
 C. Glowing of a platinum wire
 D. Oxidation reaction of cells at anode
 
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7.The purity of milk is determined by:
 A. Hydrometer
 B. Lactometer
 C. Stalagmometer
 D. Thermometer
 
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8.Which form of the matter has highest density?
 A. Gas
 B. Liquid
 C. Solid
 D. All of these
 
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