NEET Physics Specific Heat Capacity and Thermodynamical Processes MCQs Set A

Question.  The specific heat of a gas in an isothermal process is
(a) infinite
(b) negative
(c) zero
(d) remains constant

Answer: A

Question. The work done in an adiabatic change in a particular gas depends only upon
(a) change in temperature
(b) change in pressure
(c) None of these
(d) change in volume

Answer: A

Question. Which one of the following is an isoentropic process?
(a) Isothermal
(b) Adiabatic
(c) Isochoric
(d) Isobaric

Answer: A

Question. During isothermal expansion, the slope of P-V graph
(a) decreases
(b) remains same
(c) increases
(d) may increase or decrease

Answer: A

Question. Which of the following processes is adiabatic ?
(a) Bursting of tyre
(b) Melting of ice
(c) Motion of piston of an engine with constant speed
(d) None of these

Answer: A

Question. Which of the following holds good for an isochoric process?
(a) Both
(b) No work is done on the gas
(c) No work is done by the gas
(d) None of these

Answer: A

Question. Which process will increase the temperature of the system without heating it?
(a) Adiabatic compression
(b) Adiabatic expansion
(c) Isothermal compression
(d) Isothermal expansion

Answer: A

Question. A point on P – V diagram represents
(a) the condition of a system
(b) work done on or by the system
(c) work done in a cyclic process
(d) a thermodynamic process

Answer: A

Question. A sample of gas expands from volume V₁ to V₂. The amount of work done by the gas is greatest when the expansion is
(a) isothermal
(b) adiabatic
(c) isobaric
(d) equal in all cases

Answer: A

Question. When heat is given to a gas in an isothermal change, the result will be
(a) external work done
(b) rise in temperature
(c) increase in internal energy
(d) external work done and also rise in temperature

Answer: A

Question. In a cyclic process, work done by the system is
(a) equal to heat given to the system
(b) more than heat given to the system
(c) independent of heat given to the system
(d) zero

Answer: A

Question. A diatomic gas initially at 18ºC is compressed adiabatically to one eighth of its original volume. The temperature after compression will be
(a) 668.4ºK
(b) 395.4ºC
(c) 144ºC
(d) 18ºC

Answer: A

Question.  Which of the following statements are correct about isothermal and adiabatic changes?
I. Isothermal system is thermally conducting to the surroundings.
II. Adiabatic system is thermally insulated from the surroundings.
III. Internal energy changes in isothermal process.
(a) I and II
(b) I and III
(c) II and III
(d) I, II and III

Answer: A

Question.  During an adiabatic process an object does 100J of work and its temperature decreases by 5K. During another process it does 25J of work and its temperature decreases by 5K. Its heat capacity for 2nd process is
(a) 15 J/K
(b) 100 J/K
(c) 24 J/K
(d) 20 J/K

Answer: A

Question.  The pressure inside a tyre is 4 times that of atmosphere. If the tyre bursts suddenly at temperature 300 K, what will be the new temperature?
(a) 300 (4)^–2/7
(b) 300 (2)^7/2
(c) 300 (4)^2/7
(d) 300 (4)^7/2

Answer: A