61.
Amalgams are:

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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