71. The condition of perfect vacuum, i.e., absolute zero pressure can be attained at
72. Work done in a free expansion process is
73. Work-done in a free expansion process is
74. The ratio of root mean square velocity to average velocity of gas molecules at a particular temperature is
75. According to Gay Lussac’s law for a perfect gas, the absolute pressure of given mass varies directly as
76. The heat and mechanical energies are mutually convertible. This statement was established by
77. Mond gas is obtained by
78. Producer gas is obtained by
79. In open cycle gas turbine plants
80. The atomic mass of sulphur is
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