Soil acidity is generally corrected by
A Proper irrigation
B Adding sodium hydroxide
C Liming
D Application of fertilizers
Recently lead free petrol was introduced in our country because
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
The frequency of which of the following is the highest?
A Gamma rays
B Light waves
C Micro waves
D Radio waves
Sulphur is not present in
A Iron pyrites
B Gypsum
C Coal
D Chlorapatite
The purest form of water can be obtained from
A A deep tube-well
B A running stream
C A hot water spring
D A heavy shower of rain
The main use of salt in the diet is to
A Make the taste of food better
B Produce in small amounts the hydrochloric acid required for the digestion of food
C Ease the process of cooking
D Increase the solubility of food particles in water
The oil used in the froth floatation process is
A Coconut oil
B Olive oil
C Kerosene oil
D Pine oil
The material which can be deformed permanently by heat and pressure is called a
A Thermoplastic
B Thermoset
C Chemical compound
D Polymer
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