121. The ratio of root mean square velocity to average velocity of gas molecules at a particular temperature is
0.086
1.086
3.086
4.086
✅ The correct answer is option B.
Thermodynamics MCQs
122. When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. This statement is called
Zeroth law of thermodynamics
First law of thermodynamics
Second law of thermodynamics
Kelvin Planck’s law
✅ The correct answer is option A.
123. The amount of heat required to raise the temperature of __________ water through one degree is called kilojoule.
1 g
10 g
100 g
1000 g
✅ The correct answer is option D.
124. The ratio of specific heat at constant pressure (cp) and specific heat at constant volume (cv) is always __________ one.
equal to
less than
greater than
✅ The correct answer is option C.
125. The state of a substance whose evaporation from its liquid state is complete, is known as
vapour
perfect gas
air
steam
✅ The correct answer is option B.
126. The mass of flue gas per kg of fuel is the ratio of the
mass of oxygen in 1 kg of flue gas to the mass of oxygen in 1 kg of fuel
mass of oxygen in 1 kg of fuel to the mass of oxygen in 1 kg of flue gas
mass of carbon in 1 kg of flue gas to the mass of carbon in 1 kg of fuel
mass of carbon in 1 kg
✅ The correct answer is option C.
127. When the finely ground coal is moulded under pressure with or without a binding material, the resulting fuel is called briquetted coal.
Yes
No
✅ The correct answer is option A.
128. In an extensive property of a thermodynamic system
extensive heat is transferred
extensive work is done
extensive energy is utilised
none of these
✅ The correct answer is option D.
129. First law of thermodynamics deals with
conservation of heat
conservation of momentum
conservation of mass
conservation of energy
✅ The correct answer is option D.
130. The state of a substance whose evaporation from its liquid state is partial, is known as steam.
Agree
Disagree
✅ The correct answer is option B.