61. Amalgams are:
62. Which of the following is the lightest metal?
63. Which of the following metals remain in liquid for under normal conditions?
64. Potassium Permanganate is used for purifying drinking water, because
65. Which of the following is an element?
66. What is the unit for measuring the amplitude of a sound?
67. Reading of a barometer going down is an indication of
68. Decibel is the unit for
69. One fathom is equal to
70. Fathom is the unit of
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