NEET Physics Zeroth law and First Law of Thermodynamics MCQs Set A

Question. First law of thermodynamics states that
(a) heat is a form of energy
(b) system has pressure
(c) system has temperature
(d) system can do work

Answer: A

Question. A system X is neither in thermal equilibrium with Y nor with Z. The systems Y and Z
(a) may be in thermal equilibrium
(b) cannot be in thermal equilibrium
(c) must be in thermal equilibrium
(d) None of these

Answer: A

Question. Which of the following macroscopic variable is not measurable?
(a) None of these
(b) Volume
(c) Pressure
(d) Mass

Answer: A

Question. Which of the following is a state variable ?
(a) Internal energy
(b) Heat
(c) Work
(d) All of these

Answer: A

Question. The internal energy of an ideal gas depends upon
(a) temperature
(b) specific volume
(c) pressure
(d) density

Answer: A

Question. Energy transfer brought about by moving the piston of a cylinder containing the gas is known as
(a) work
(b) pressure
(c) heat
(d) temperature

Answer: A

Question. The state of a thermodynamic system is represented by
(a) pressure, volume and temperature
(b) volume only
(c) pressure only
(d) number of moles

Answer: A

Question. Which of the following parameters does not characterize the thermodynamic state of matter?
(a) Work
(b) Temperature
(c) Pressure
(d) Volume

Answer: A

Question. At a given temperature the internal energy of a substance
(a) in liquid state is less than that in gaseous state
(b) in liquid state is more than that in gaseous state
(c) is equal for the three states of matter.
(d) in liquid state is equal to that in gaseous state.

Answer: A

Question. The variable defined by Zeroth law of thermodynamics is
(a) temperature
(b) work
(c) internal energy
(d) All of these

Answer: A

Question. Assertion : Zeroth law of thermodynamics explain the concept of energy.
(a) Assertion is incorrect, reason is correct
(b) Assertion is correct, reason is incorrect
(c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: A

Question. Thermodynamics is concerned in part with transformations between
(a) heat, internal energy and mechnical work
(b) one form of mechanical energy into other forms
(c) internal energy at various temperatures
(d) different forms of heat energy

Answer: A

Question. The first law of thermodynamics expresses
(a) law of conservation of energy
(b) law of conservation of mass
(c) All of the above
(d) law of conservation of momentum

Answer: A

Question. Which of the following is incorrect regarding first law of thermodynamics?
(a) It introduces the concept of entropy
(b) It introduces the concept of internal energy
(c) It is applicable to cyclic processes
(d) It is a restatement of principle of conservation of energy

Answer: A

Question. 110 joules of heat is added to a gaseous system, whose internal energy is 40J; then the amount of external work done is
(a) 70 J
(b) 110 J
(c) 40 J
(d) 150 J

Answer: A

Question. The change in internal energy of a thermodynamical system which has absorbed 2 kcal of heat and done 400 J of work is (1 cal = 4.2 J)
(a) 8 kJ
(b) 3.5 kJ
(c) 5.5 kJ
(d) 2 kJ

Answer: A

Question. Which of the following statements are incorrect?
(a) II and III
(b) I and II
(c) I, II and III
(d) I and III

Answer: A

Question. If the amount of heat given to a system is 35 J and the amount of work done on the system is 15 J, then the change in internal energy of the system is
(a) 50 J
(b) 30 J
(c) 20 J
(d) –50 J

Answer: A

Question. A gas is compressed from a volume of 2m3 to a volume of 1m3 at a constant pressure of 100 N/m2. Then it is heated at constant volume by supplying 150 J of energy. As a result, the internal energy of the gas:
(a) increases by 250 J
(b) increases by 50 J
(c) decreases by 250 J
(d) decreases by 50 J

Answer: A