NEET Physics Specific Heat Capacity and Thermodynamical Processes MCQs Set B

a) Assertion is correct, reason is correct; reason is a correct explanation for assertion.

b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion

c) Assertion is correct, reason is incorrect

d) Assertion is incorrect, reason is correct.

Answer: Assertion is correct, reason is correct; reason is a correct explanation for assertion.

Question: Which of the following is the P-V curve for isothermal and adiabatic process of an ideal gas?

a)

b)

c)

d)

Answer:

Question:  One mole of an ideal gas at an initial temperature of T K does 6R joules of work adiabatically. If the ratio of specific heats of this gas at constant pressure and at constant volume is 5/3, the final temperature of gas will be

a) (T – 4) K

b) (T – 2.4) K

c) (T + 2.4) K

d) (T + 4) K

Answer:  (T – 4) K

Question:

a) DEF

b) ABC

c) Equal in both processes

d) It cannot be predicted

Answer:  DEF

Question:   In a thermodynamic process, pressure of a fixed mass of gas is changed in such a manner that the gas molecules gives out 30 joules of heat and 10 J of work is done on the gas. If the initial internal energy of the gas was 40J, then final internal energy will be

a) 20 J

b) –20 J

c) 80 J

d) zero

Answer: 20 J

Question: Calculate the work done when 1 mole of a perfect gas is compressed adiabatically. The initial pressure and volume of the gas are 105 N/m2 and 6 litre respectively. The final volume of the gas is 2 litres. Molar specific heat of the gas at constant volume is 3R/2. [Given (3)5/3 = 6.19]

a) –957 J

b) +957 J

c) – 805 J

d) + 805 J

Answer:  –957 J

Question:

a) 2116 J

b) 705.3 J

c) 1158 J

d) 211.6 J

Answer:  2116 J

Question:

a) ae

b) ac

c) ce

d) af

Answer:  ae

Question:

a) ACBDA

b) ACBB'A'A

c) ADBB'A'A

d) None of these

Answer: ACBDA

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

Question:  Unit mass of a liquid with volume V₁ is completely changed into a gas of volume V₂ at a constant external pressure P and temperature T. If the latent heat of evaporation for the given mass is L, then the increase in the internal energy of the system is

a) L – P(V₂ – V₁)

b) Zero

c) P(V₂ – V₁)

d) L

Answer:  L – P(V₂ – V₁)

Question:

a) (A) – (3), (B) – (1), (C) – (2), D – (2)

b) (A) – (1), (B) – (2), (C) – (4), D – (3)

c) (A) – (2), (B) – (1), (C) – (4), (D) – (3)

d) (A) – (4), (B) – (3), (C) – (2), (D) – (1)

Answer: (A) – (3), (B) – (1), (C) – (2), D – (2)

Question:

a)

b)

c)

d)

Answer:

Question:

a)

b)

c)

d)

Answer:

Question:  In P-V diagram shown in figure ABC is a semicircle. The work done in the process ABC is

a)

b)

c) 4 J

d) zero

Answer:

Question:

a) –560 MPa/m³

b) –56 MPa/m³

c) –400 MPa/m³

d) None of these

Answer: –560 MPa/m³

Question:  The P-V diagram of a gas system undergoing cyclic process is shown here. The work done during isobaric compression is

a) 400 J

b) 200 J

c) 100 J

d) 600 J

Answer: 400 J

Question:  1 gm of water at a pressure of 1.01 × 10⁵ Pa is converted into steam without any change of temperature. The volume of 1 g of steam is 1671 cc and the latent heat of evaporation is 540 cal. The change in internal energy due to evaporation of 1 gm of water is

a)

b)

c) 540 cal

d) 581 cal

Answer:

Question:  A certain amount of ideal monoatomic gas undergoes, process given by UV^1/2 = C where U is the internal energy of the gas. The molar specific heat of the gas for the process will be

a) –R/2

b) 5R/2

c) 3R

d) R/2

Answer: –R/2

Question:

a)

b)

c)

d)

Answer:

Question:

a) 12 × 10⁵ joule

b) 7.5 × 10⁵ joule

c) 7.5 × 10⁵ erg

d) 6 × 10⁵ joule

Answer: 12 × 10⁵ joule

Question:  When the state of a gas adiabatically changed from an equilibrium state A to another equilibrium state B an amount of work done on the stystem is 35 J. If the gas is taken from state A to B via process in which the net heat absorbed by the system is 12 cal, then the net work done by the system is (1 cal = 4.19 J

a) 15.4 J

b) 13.2 J

c) 12.6 J

d) 16.8 J

Answer: 15.4 J

Question:  Carbon monoxide is carried around a closed cycle abc in which bc is an isothermal process as shown in the figure . The gas absorbs 7000 J of heat as its temperture increases from 300 K to 1000 K in going from a to b. The quantity of heat rejected by the gas during the process ca is

a) 9800 J

b) 9000 J

c) 5000 J

d) 4200 J

Answer: 9800 J

Question:  Two cylinders A and B fitted with pistons contain equal amounts of an ideal diatomic gas at 300 K. The piston of A is free to move while that of B is held fixed. The same amount of heat is given to the gas in each cylinder. If the rise in temperature of the gas in A is 30 K, then the rise in temperature of the gas in B is

a) 42 K

b) 50 K

c) 18 K

d) 30 K

Answer: 42 K

Question:  Which of the following processes is reversible?

a) None of these

b) Electrical heating of a nichrome wire

c) Isothermal compression

d) Transfer of heat by conduction

Answer:  None of these

Question: Assertion : When a bottle of cold carbonated drink is opened a slight fog forms around the opening.
Reason : Adiabatic expansion of the gas causes lowering of temperature and condensation of water vapours.

a) Assertion is correct, reason is correct; reason is a correct explanation for assertion

b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion

c) Both

d) None of these

Answer:  Assertion is correct, reason is correct; reason is a correct explanation for assertion