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

a) heat is a form of energy

b) system has pressure

c) system has temperature

d) system can do work

Answer: heat is a form of energy

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: may be in thermal equilibrium

Question: Which of the following macroscopic variable is not measurable?

a) None of these

b) Volume

c) Pressure

d) Mass

Answer: None of these

Question:  Which of the following is a state variable ?

a) Internal energy

b) Heat

c) Work

d) All of these

Answer:  Internal energy

Question:  The internal energy of an ideal gas depends upon

a) temperature

b) specific volume

c) pressure

d) density

Answer: temperature

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:  work

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: pressure, volume and temperature

Question: Which of the following parameters does not characterize the thermodynamic state of matter?

a) Work

b) Temperature

c) Pressure

d) Volume

Answer:  Work

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: in liquid state is less than that in gaseous state

Question:  The variable defined by Zeroth law of thermodynamics is

a) temperature

b) work

c) internal energy

d) All of these

Answer:  temperature

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

Question: Assertion : Zeroth law of thermodynamics explain the concept of energy.
Reason : Energy depends on temperature.

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: Assertion is incorrect, reason is correct

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: heat, internal energy and mechnical work

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: law of conservation of energy

Question:  In changing the state of thermodynamics from A to B state, the heat required is Q and the work done by the system is W. The change in its internal energy is

a) Q – W

b) Q

c) Q + W

d)

Answer: Q – W

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:  It introduces the concept of entropy

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: 70 J

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: 8 kJ

Question:  Which of the following statements are incorrect?
I. If Q > 0, heat is added to the system.
II. If W > 0, work is done by the system.
III. If W = 0, work is done by the system.

a) II and III

b) I and II

c) I, II and III

d) I and III

Answer:  II and III

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:  50 J

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: increases by 250 J