71. A sudden fall in the barometer reading is a sign of approaching
72. If heat be exchanged in a reversible manner, which of the following property of the working substance will change accordingly
73. A path 1-2-3 is given. A system absorbs 100 kJ as heat and does 60 kJ of work while along the path 1-4-3, it does 20 kJ of work. The heat absorbed during the cycle 1-4-3 is
74. One molecule of oxygen is __________ times heavier than the hydrogen atom.
75. The oxygen atom is ________ times heavier than the hydrogen atom.
76. Heat and work are
77. During throttling process
78. Universal gas constant is defined as equal to product of the molecular weight of the gas and
79. The index of compression ‘n’ tends to reach ratio of specific heats ‘y’ when
80. The fuel mostly used in cement industry and in metallurgical processes is
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