81. A metalloid possesses the characteristics of both the metals and non-metals. Which of the following is not a metalloid?
82. Hypo (sodium thiosulphate) because of its complex forming behaviour is used in photography to remove undecomposed silver bromide as a soluble complex for __________ of the picture.
83. Minimum diameter of the tube used for making water manometer should be __________ mm to avoid a correction for the effect of capillarity.
84. Steel balls are manufactured by cold heading. After cold forming, they are subjected to
85. __________ number is sometimes used in place of Grashoff number in free convection heat transfer.
86. Which of the following is the most suitable for removing fine particles (< 1 micron diameter) from air below its dew point?
87. Volute casing of a centrifugal pump does not facilitate
88. Function of gear box is to
89. Function of fusible plug in a boiler is to
90. Co-efficient of performance of a Carnot cycle refrigerator operating between - 23°C and + 27°C is
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