Class IX

The material which can be deformed permanently by heat and pressure is called a
  1. thermoplastic
  2. thermoset
  3. chemical compound
  4. polymer
The main use of salt in the diet is to
  1. make the taste of food better
  2. produce in small amounts the hydrochloric acid required for the digestion of food
  3. ease the process of cooking
  4. increase the solubility of food particles in water
The method that cannot be used for removing permanent hardness of water is
  1. adding sodium carbonate
  2. distillation
  3. adding caustic soda
  4. boiling
The oil used in the froth floatation process is
  1. coconut oil
  2. olive oil
  3. kerosene oil
  4. pine oil
The heat energy produced when the human body metabolises 1 gram of fat is
  1. 30 KJ
  2. 1 KJ
  3. 39 KJ
  4. 29 KJ
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