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Engineering Physics Practice Test: Kinetic Theory of Gases, Ideal Gas, Gas Reactions
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Kinetic Theory of Gases topics include: gases and its reactions, ideal gases. The kinetic theory of gases is a model that describes gases as a large number of submicroscopic particles that are in constant, random motion. The particles frequently collide with each other and with the walls of any container.  The kinetic theory relates the independent motion of molecules to the mechanical and thermal properties of gases. These properties include pressure, volume, temperature, viscosity, and heat conductivity.  The kinetic theory of gases has five main postulates: The particles in a gas are... Show more
Engineering Physics Practice Test: Kinetic Theory of Gases, Ideal Gas, Gas Reactions
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25 Questions

1. In a vessel, the gas at a pressure P. If the mass of all molecules is halved and their speed is doubled, then the resultant pressure will be ___________
2. Two gases are at absolute temperatures 300K and 350K respectively. What is the ratio of average kinetic energy of their molecules?
3. In an adiabatic process, the quantity which remains constant is ___________
4. The temperature of H2 at which the rms velocity of its molecules is seven times the rms velocity of the molecules of nitrogen at 300K is?
5. A gas at one atmosphere and having volume 100ml is mixed with another gas of equal moles at 0.5atm and having volume 50ml in flask of one litre, what is the final pressure?
6. What is the average velocity of the molecules of an ideal gas?
7. The average translational kinetic energy of O2 molecules (relative molar mass 32) at a particular temperature is 0.048eV. The translational kinetic energy of N2 molecules (relative molar mass) in eV at the same temperature is?
8. On which factor does the average kinetic energy of gas molecules depend?
9. The temperature of sink of Carnot’s engine is 27°C. If the efficiency of the engine is 25%, then the temperature of source must be ___________
10. Assertion: In the pressure-temperature phase diagram of water, the slope of the melting curve is found to be negative.
Reason: Ice contracts on melting to water.
11. The ration of the speed of sound in nitrogen gas to that in helium gas, at 300 K is?
12. The temperature of gas is held constant, while its volume is decreased. The pressure exerted by the gas on the wall of the container increases, because of its molecules ___________
13. A gas mixture consists of 2 moles of oxygen and 4 moles of argon at temperature T. Neglecting all vibrational modes, the total internal energy of the system is?
14. A Carnot engine, whose sink is at 300 K, has an efficiency of 40%. By how much should the temperature of source be increased, so as to increase the efficiency by 50% of original efficiency?
15. A perfect gas is contained in a cylinder kept in vacuum. If the cylinder suddenly bursts, then the temperature of the gas ___________
16. A bulb contains one mole of hydrogen mixed with one mole of oxygen at temperature T. The ratio of rms values of velocity of hydrogen molecules to that of oxygen molecules is?
17. The relation PV=RT can describe behaviour of the real gas at ___________
18. An absolute zero is the temperature at which?
19. The ratio of the vapour densities of two gases at a given temperature is 9:8. The ratio of the rms velocities of their molecules is ___________
20. The absolute zero is the temperature, at which?
21. In the upper part of the atmosphere, the kinetic temperature of the air is of the order 1000K. Therefore one feels extremely hot.
22. We have a jar filled with gas characterised by parameters P, V and T and another jar B filled with a gas with parameters 2P, V/4,2T; where the symbols have their usual meanings. The ratio of the number of molecules of jar A to those of jar B is?
23. When we heat a gas-sample from 27°C to 327°C, then the initial average kinetic energy of the molecules was E. What will b the average kinetic energy?
24. Which of the following is not a thermodynamics co-ordinate?
25. The mean kinetic energy of one mole of gas per degree of freedom (on the basis of a kinetic theory of gases) is ___________