61.  What is the average value of salt present in sea water?

Answer & Explanation
3.5%

62.  Disadvantage of using DDT as pesticide is -

Answer & Explanation
Not easily degradable in nature

63.  The two specific Heats of gases are related by-

Answer & Explanation
CP-CV = R/J

64.  What is the Main Source of Manufacturing of Nitrogenous Fertilizer?

Answer & Explanation
Ammonia

65.  What happens during the charging of Lead operated battery?

Answer & Explanation
Consumption                                of sulphuric acid

66.  Plaster of Paris is made by the Partial dehydration of -

Answer & Explanation
Gypsum Salt

67.  Lime water becomes milky when exposed to air due to the presence of -

Answer & Explanation
Carbon dioxide

68.  Venturimeter is used to measure the-

Answer & Explanation
Rate of flow of Liquid

69.  When Hydrogen combusts in air, then formed-

Answer & Explanation
Water (H20)

70.  Gas used as a fire extinguisher is

Answer & Explanation
Carbon dioxide (CO2)

71.  Chemically Lime water is -

Answer & Explanation
Calcium Hydroxide

72.  Which gas is used for converting vegetable oils into saturated fats -

Answer & Explanation
H2 (Hydrogen)

73.  Enzyme which coagulate the milk into curd-

Answer & Explanation
Renin

74.  Process of Removal of calcium and Magnesium is known as -

Answer & Explanation
Water softening

75.  Water gas is a Mixture of-

Answer & Explanation
Carbon monoxide and Hydrogen
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