Kinetic Theory Mock Test – Class 11 Physics

1. A gas has molar mass and temperature . Its pressure is . Another sample of the same gas has pressure and temperature . The density of the second sample is

2. A linear diatomic gas at ordinary temperature is heated to a range where one vibrational mode becomes active. Compared with the ordinary-temperature value, the best prediction from equipartition is that

3. Match each gas law with its constant condition.

4. A sample contains molecules in volume . Its number density is represented by

5. An ideal gas has molar mass . At a certain temperature, its rms speed is . Taking , the pressure of the gas if its density is is

6. A learner writes, “Brownian motion proves that the suspended particle itself is a molecule.” The better conclusion is that Brownian motion shows

7. Match the molecular motion type with the best description.

8. A monatomic ideal gas has . Its molar heat capacity at constant volume is

9. Which statement gives the best comparison between molecular motion in a liquid and in a gas?

10. Two samples of the same monatomic ideal gas have the same number of moles and the same temperature but different pressures and volumes. Their internal energies are

11. Gas laws are called macroscopic starting points because they relate measurable quantities such as

12. A gas sample is described once by and once by . If the sample has , then the molecule count used in the second equation is

13. The relation shows that, for the same gas volume and molecular mass, pressure increases when

14. Read the situation below and answer the question.

This molecular picture is most directly related to

15. A gas sample has mass and molar mass . Its amount and approximate number of molecules, using , are

16. A graph of pressure versus for a gas sample is a straight line through the origin. The slope of the graph is . The density of the gas and the pressure when are respectively

17. A rigid steel cylinder contains gas and is heated. Since its volume remains practically constant, the pressure mainly follows

18. A gas of molar mass is at . Another gas of molar mass has the same . Its temperature is

19. A molecule of mass hits a wall normally with speed and rebounds elastically. The magnitude of impulse delivered to the wall is

20. A molecule has mass , and its gas has molar mass . The correct relation between , , and is

21. A molecule moving with -component hits a wall perpendicular to the -axis elastically. Its -momentum changes from to . The magnitude of the molecule's momentum change is

22. A claim says, “A gas with larger must always have larger .” The best evaluation is that

23. A gas sample has molecules in . What is its number density in ?

24. The observed Brownian motion of a suspended particle becomes more vigorous when the temperature of the fluid is raised. This happens mainly because

25. The same ideal gas is heated through once at constant pressure and once at constant volume. The extra heat required at constant pressure is

26. In the ideal-gas kinetic model, molecules are treated as point particles because their own volume is assumed to be

27. A monatomic ideal gas changes state through two different paths between the same initial and final temperatures. The change in internal energy is

28. Two gas bulbs have equal volume and are maintained at the same temperature and pressure. Bulb P contains methane and bulb Q contains argon. The best comparison is

29. A fixed amount of gas changes from to at constant temperature. If its initial pressure is , what is the final pressure?

30. Equal volumes of helium and oxygen are kept at the same and . If the helium sample contains molecules, the oxygen sample contains

31. The graph of mean free path against number density , for fixed molecular diameter , is best described as

32. A gas of molar mass has rms speed . Taking , its absolute temperature is closest to

33. At the same temperature, hydrogen molecules have a larger than oxygen molecules mainly because hydrogen has

34. A gas is pumped out of a vessel so that the number density decreases greatly. The mean free path of the remaining molecules becomes

35. A monatomic ideal gas is heated from to . Taking , the change in internal energy is closest to

36. A real gas is most likely to behave nearly like an ideal gas when it is

37. Kinetic theory mainly explains the behaviour of a gas by considering

38. An ideal gas has at . Taking , its molar mass is closest to

39. A gas-law graph is drawn for a fixed amount of gas. The horizontal axis is absolute temperature , and the vertical axis is pressure . The graph is a straight line through the origin. This graph is consistent with

40. A gas molecule has rms speed and mean free path . A useful estimate of collision frequency is

41. Use the graph description below.

The slope of this graph is

42. In a cubical container of side , a molecule with -component travels between the two opposite walls perpendicular to the -axis. The time between two successive collisions with the same wall is

43. A derivation line shows . The same line is then used to conclude . The missing factor in the final rms-speed expression is

44. A real gas is expected to behave most nearly like an ideal gas when it is at

45. An ideal gas has . A sample is heated by at constant pressure. Using , the heat supplied is closest to

46. Which description best represents molecular motion in an ordinary gas?

47. A rigid container holds a fixed amount of ideal gas. The pressure-temperature graph is linear only when the temperature axis is marked in

48. A gas has a longer mean free path under one set of conditions than under another. For transport phenomena, this usually means molecules can

49. A gas is warmed from to . The ratio of final to initial average translational kinetic energy per molecule is

50. A monatomic ideal gas is heated from to . At the same time, its volume doubles. The change in internal energy is, using ,