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Shilpa

HomeAuthor: Shilpa

59. The average kinetic energy of hydrogen molecules at 300 K is E. At the same temperature, the average kinetic energy of oxygen molecules will be

(a)  E/4                          (b)  E/16 (c) E                               (d)  4...

46. Two gases are at absolute temperatures 300 K and 350 K respectively. Ratio of average kinetic energy of their molecules is

(a) 7 : 6                           (b) 6 : 7...

58. The kinetic energy of one gm-mole of a gas at normal temperature and pressure is (R = 8.31 J/Mole-K)

(a)  0.56×104 J                        (b) 1.3×102 J (c) 2.7×102 J                       ...

57. The temperature at which the average translational kinetic energy of a molecule is equal to the energy gained by an electron in accelerating from rest through a potential difference of 1 volt is

(a)  4.6×103 K                         (b)  11.6×103 K (c) 23.2×103 K                      (d)  7.7×103...

56. Mean kinetic energy per degree of freedom of gas molecules is

(a) (3/2)kT                                   (b) kT...

55. The molecules of an ideal gas at a certain temperature have

(a) Only potential energy (b) Only kinetic energy (c) Potential and kinetic energy both (d) None of the above Answer-b...

54. Two ideal gases at absolute temperature

T1 and T2 are mixed. There is no loss of energy. The masses of the molecules are m1 and m2...

53. The total momentum of the molecules of 1 gm mol of a gas in a container at rest of 300 K is

(a) 2×√3R×300 gm×cm/sec (b) 2×3×R×300 gm×cm/sec (c) 1×√3R×300 gm×cm/sec (d) Zero Answer-d (14)

52. In the absence of intermolecular force of attraction, the observed pressure P will be

(a)    P                            (b)  < P (c) >...

51. Vapour is injected at a uniform rate in a closed vessel which was initially evacuated. The pressure in the vessel

(a) Increase continuously (b) Decreases continuously (c) First increases and then decreases (d) First increase and then becomes constant Answer-c...

50. The capacity of a vessel is 3 litres. It contains 6 gm oxygen, 8 gm nitrogen and 5 gm

CO2 mixture at 27°C. If R = 8.31 J/mole  kelvin, then the pressure in the vessel in N/m2  will be (approx.)...

49. The mean kinetic energy of a gas at 300 K is 100 J. The mean energy of the gas at 450 K is equal to

(a)  100 J                               (b) 3000 J (c) 450 J                       ...

48. On colliding in a closed container the gas molecules

(a) Transfer momentum to the walls (b) Momentum becomes zero (c) Move in opposite directions (d) Perform Brownian motion Answer-a...

27. The kinetic energy of one gram molecule of a gas at normal temperature and pressure is(8.31 J/mole-K)

(a) 0.56×104 J                                 (b) 1.3×102...

35. The average translational energy and the m.s. speed of molecules in a sample of oxygen gas at 300 K are

6.21×10-21  J and 484 m/s respectively. The corresponding values at 600 K are nearly (assuming ideal gas behaviour) (a) 12.42×1021 ...

45. The average kinetic energy of a helium atom 30° C at

(a)  Less than 1 eV                   (b)  A few keV (c)   50-60 eV                            (d)  13.6 eV Answer-a (13)

44. The temperature of a gas is – 68°C. At what temperature will the average kinetic energy of its molecules be twice that of at – 68°C

(a)  137°C                                (b)  127°C (c)   100°C                                (d)  105°C Answer-a (10)

43. On absolute temperature, the kinetic energy of the molecules

(a)  Becomes zero                    (b)  Becomes maximum (c)   Becomes minimum          (d)  Remains constant Answer-a (14)

42. Energy of all molecules of a monoatomic gas having a volume V and pressure P is (3/2)PV . The total translational kinetic energy of all molecules of a diatomic gas as the same volume and pressure is

(a) (1/2)PV                                   (b)...

41. Vessel A is filled with hydrogen while vessel B, whose volume is twice that of A, is filled with the same mass of oxygen at the same temperature. The ratio of the mean kinetic energies of hydrogen and oxygen is

(a)  16 : 1                                  (b)  1 : 8 (c)   8 : 1                                    (d)  1 : 1 Answer-d (40)

40. If temperature of gas increases from 27°C to 927°C the K.E. will be

(a)  Double                                 (b)  Half (c)  ...

39. A box contains a mixture of

H2 and He gases. Which of the following statements are corrects (a)  The average translational kinetic energies of H2  molecules...

38. At the same temperature and pressure and volume of two gases, which of the following quantities is constant

(a)  Total number of molecules (b)  Average kinetic energy (c)   Root mean square velocity (d)  Mean free path Answer-b (14)

37. At 0 K which of the following properties of a gas will be zero

(a) Kinetic energy                          (b)  Potential energy (c)   Vibrational energy                (d)  Density Answer-a (6)

36. A polyatomic gas with n degrees of freedom has a mean energy per molecule given by

(a)  (nkT)/N                                     ...

34. The average translational kinetic energy of

O2 (molar mass 32) molecules at a particular temperature is 0.048 eV. The translational kinetic energy of N2  (molar mass...

33. The average kinetic energy of a gas molecule at 27°C is

6.21×10-21 J . Its average kinetic energy at 227°C will be (a) 52.2×10-21 J               ...

32. At 27°C temperature, the kinetic energy of an ideal gas is

E1 . If the temperature is increased to 327°C, then kinetic energy would be (a)  2E1         ...

31. The translational kinetic energy of gas molecule for one mole of the gas is equal to

(a) (3/2)RT                                     ...

30. Read the given statements and decide which is/are correct on the basis of kinetic theory of gases [MP PMT 2003] (I) Energy of one molecule at absolute temperature is zero (II) r.m.s. speeds of different gases are same at same temperature (III) For one gram of all ideal gas kinetic energy is same at same temperature (IV) For one mole of all ideal gases mean kinetic energy is same at same temperature

(a)  All are correct                           (b)  I and IV are correct (c)   IV is correct             ...

29. At what temperature is the kinetic energy of a gas molecule double that of its value of 27°C

(a)  54°C                                          (b)  300 K (c)   327°C                           ...

28. The mean kinetic energy of a gas at 300 K is 100 J. The mean energy of the gas at 450 K is equal to

(a)   100 J                                          (b)  3000 J (c)   450 J                       ...

26. The translatory kinetic energy of a gas per gm is

(a) (3RT)/(2N)                                     ...

25. The kinetic energy of translation of 20 gm of oxygen at 47°C is (molecular wt. of oxygen is 32 gm/mol and R = 8.3 J/mol/K)

(a)  2490 joules                                (b)  2490 ergs (c)   830 joules                     ...

24. At which of the following temperature would the molecules of a gas have twice the average kinetic energy they have at 20°C

(a) 40°C                                          (b)  80°C (c)   313°C                             ...

23. The kinetic energy per gm mol for a diatomic gas at room temperature is

(a)  3 RT                                           (b) (5/2) RT (c) (3/2)  RT                                  (d) (1/2) RT Answer-b (7)

22. The time average of the kinetic energy of one molecule of a gas taken over a long period of time

(a)  Is proportional to the square root of the absolute temperature of the gas (b) Is proportional to the absolute...

21. A sealed container with negligible coefficient of volumetric expansion contains helium (a monoatomic gas). When it is heated from 300 K to 600 K, the average K.E. of helium atoms is

(a)  Halved                                       (b)  Unchanged (c)  Doubled                             ...

20. Mean kinetic energy (or average energy) per gm molecule of a monoatomic gas is given by

(a)  (3/2)RT                                     ...

19. The average kinetic energy of a gas molecule can be determined by knowing

(a) The number of molecules in the gas (b)  The pressure of the gas only (c)   The temperature of the...

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