NEET Physics Degree of Freedom Specific Heat Capacity and Mean Free Path MCQs Set A

a)

b)

c)

d)

Answer:

Question:

a) 1.50

b) 1.53

c) 1.40

d) 3.07

Answer:  1.50

Question:

a)

b)

c)

d)

Answer:

Question: Mean free path of a gas molecule is

a) inversely proportional to number of molecules per unit volume

b) inversely proportional to diameter of the molecule

c) directly proportional to the square root of the absolute temperature

d) directly proportional to the molecular mass

Answer: inversely proportional to number of molecules per unit volume

Question: If the pressure in a closed vessel is reduced by drawing out some gas, the mean-free path of the molecules

a) is increased

b) increases or decreases according to the nature of the gas

c) is decreased

d) remains unchanged

Answer:  is increased

Question:

a) I, III and IV

b) I, II and III

c) III and IV only

d) I, II, III and IV

Answer: I, III and IV

Question: The specific heat of a gas

a)

b) has a unique value at a given temperature

c) depends upon the mass of the gas

d) None of these

Answer: 

Question:  The total internal energy of one mole of rigid diatomic gas is

a)

b)

c)

d)

Answer:

Question: The specific heats at constant pressure is greater than that of the same gas at constant volume because

a) at constant pressure work is done in expanding the gas

b) at constant volume work is done in expanding the gas

c) the molecular attraction increases more at constant pressure

d) the molecular vibration increases more at constant pressure

Answer: at constant pressure work is done in expanding the gas

Question: One mole of a gas occupies 22.4 lit at N.T.P. calculate the difference between two molar specific heats of the gas J = 4200 J/kcal

a) 1.972 kcal/kmol K

b) 4.569 kcal/kmol K

c) 2.378 kcal/kmol K

d) 3.028 kcal/kmol K

Answer: 1.972 kcal/kmol K

Question: As per the law of equi-partition of energy each vibrational mode gives how many degrees of freedom ?

a) 2

b) 3

c) 0

d) 1

Answer: 2

Question: A fly moving in a room has ...X... degree of freedom. Here, X refers to

a) three

b) four

c) two

d) one

Answer:  three

Question:

a) II only

b) None of these

c) I only

d) I and II

Answer: II only

Question: The number of degrees of freedom for each atom of a monatomic gas is

a) 3

b) 5

c) 6

d) 1

Answer: 3

More Questions.....................................................

Question: The total number of degree of freedom of a CO₂ gas molecule is

a) 6

b) 5

c) 4

d) 3

Answer:  6

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

a)

b)

c)

d) None of these

Answer:

Question: The degree of freedom of a molecule of a triatomic gas is

a) 6

b) None of these

c) 4

d) 2

Answer:  6

Question:

a) a = b

b) a = 4 b

c) 16 a = b

d) a = 16 b

Answer: a = b

Question: P-V diagram of a diatomic gas is a straight line passing through origin. The molar heat capacity of the gas in the process will be

a) 3 R

b) 2.5 R

c) 4 R

d) None of these

Answer: 3 R

Question:

a)

b)

c)

d)

Answer:

Question: The number of collisions per second suffered by a molecule in a sample of hydrogen at S.T.P is:

[Mean free path = 1.38 × 10^–5 cm]

a) 1.23 × 10¹⁰

b) 1.1 × 10⁶

c) 8.3 × 10¹²

d) 10¹⁵

Answer: 1.23 × 10¹⁰

Question: How many degrees of freedom are associated with 2 grams of He at NTP ?

a) 9.03 × 10²³

b) 6

c) 3.01 × 10²³

d) 3

Answer:  9.03 × 10²³

Question:

a) 0.2 mm

b) 0.2 cm

c) None of these

d) 0.2 nm

Answer: 0.2 mm

Question:  The ratio of molar specific heat at constant pressure C_P, to molar specific heat at constant volume C_v for a monoatomic gas is

a)

b)

c)

d)

Answer:

Question:  The ratio of the molar heat capacities of a diatomic gas at constant pressure to that a constant volume is

a)

b)

c)

d)

Answer:

Question: If C_P and C_V denote the specific heats of nitrogen per unit mass at constant pressure and constant volume respectively, then

a) C_P – C_V = R/28

b) C_P – C_V = R

c) C_P – C_V = 28R

d) C_P – C_V = R/14

Answer: C_P – C_V = R/28

Question: The molar specific heat at constant pressure of an ideal gas is (9/2)R. The ratio of specific heat at constant pressure to that at constant volume is

a) 1.28

b) 1.44

c) 1.82

d) 1.58

Answer:  1.28

Question:

a)

b)

c)

d)

Answer:

Question:

a) 1.62

b) 1.59

c) 1.54

d) 1.4

Answer: 1.62

Question: A cylinder rolls without slipping down an inclined plane, the number of degrees of freedom it has, is

a) 2

b) 3

c) 5

d) 1

Answer:  2

Question:

a)

b)

c)

d)

Answer: