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A Carbon
B Hydrogen
C Oxygen
D Nitrogen

A Acetone
B Acetic acid
C Acetophenone
D Phenyl acetate

A Atomic structure
B Metallurgy
C Periodic table of contents
D Discovery of elements

A Ni
B Pb
C Cu
D Pt

A Molality
B Molarity
C Normality
D Formality

A Proper irrigation
B Adding sodium hydroxide
C Liming
D Application of fertilizers

A They are not needed now as anti-knock agents
B They tower the efficiency of the engine
C They cause less pollution
D To reduce the cost of petrol

A Gamma rays
B Light waves
C Micro waves
D Radio waves

A Iron pyrites
B Gypsum
C Coal
D Chlorapatite

A A deep tube-well
B A running stream
C A hot water spring
D A heavy shower of rain