MDCAT XII Physics 1st Law Of Thermodynamics Online Test-2

Instructions for MDCAT XII Physics 1st Law Of Thermodynamics Online Test-2:

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Test Details:

Subject: Physics
Class: 2nd year or 12
Chapter Name: 1st Law Of Thermodynamics
Test: MDCAT 2025
Book: Sindh Textbook
Total No. Of MCQS: 50 MCQS
Time Allowed: 50 Minutes
Price: Free

206

Created on April 13, 2025 By

medicoengineer.com

MDCAT XII Physics 1st Law of Thermodynamics Online Test-2

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NameEmailPhone Number

1 / 60

1. The heat transfer equation indicates:

a) Dependence of heat transfer on the extent of temperature change

b) Dependence of heat transfer on material properties

c) Both a and b

d) None of the above

2 / 60

2. The concept of caloric was proposed by:

a) Count Rumford

b) Sadi Carnot

c) Albert Einstein

d) Isaac Newton

3 / 60

3. In the equation Q = mcΔT, what does 'c' represent?

a) Heat capacity

b) Specific heat capacity

c) Molar heat capacity

d) Molecular heat capacity

4 / 60

4. Internal energy is:

a) The sum of the total kinetic energy of a body

b) The sum of the average kinetic energy of a body

c) The sum of the potential energy of a body

d) The sum of both kinetic and potential energy of a body

5 / 60

5. The internal energy of matter can be determined by:

a) Temperature

b) Random motion of molecules

c) State of matter

d) All of the above

6 / 60

6. The internal energy of an ideal gas depends on:

a) Temperature

b) Random motion of molecules

c) State of matter

d) All of the above

7 / 60

7. The change in internal energy of an ideal gas depends on:

a) Change in temperature

b) Change in kinetic energy

c) Temperature

d) Both a and b

8 / 60

8. The SI unit of energy is:

a) Calorie

b) Erg

c) Joule

d) All of the above

9 / 60

9. Which of the following represents the heat transfer equation?

a) Q = ncΔT

b) Q = mcΔT

c) Q = cΔT

d) Both a and b

10 / 60

10. The internal energy of an ideal gas increases upon heating due to:

a) Faster movement of molecules

b) Increase in kinetic energy

c) Increase in potential energy

d) Both a and b

11 / 60

11. Thermodynamics is the study of the flow of:

a) Heat energy in and out of a system during physical and chemical transformations

b) Temperature in and out of a system during physical and chemical transformations

c) Both a and b

d) None of the above

12 / 60

12. A thermos flask is an example of a:

a) Open system

b) Closed system

c) Isolated system

d) Cannot be determined

13 / 60

13. A cup of tea is placed on a table. Which of the following is considered the system?

a) The cup

b) The tea inside the cup

c) The table the cup is placed on

d) The air surrounding the cup

14 / 60

14. The kinetic energy component of internal energy includes:

a) Vibration of particles

b) Collision of particles

c) Intermolecular forces

d) All of the above

15 / 60

15. During which process is the specific heat of a gas considered zero?

a) Adiabatic

b) Isothermal

c) Isochoric

d) Isobaric

16 / 60

16. In an isochoric process, supplying heat to a gas causes:

a) An increase in internal energy

b) An increase in pressure

c) An increase in temperature

d) All of the above

17 / 60

17. In an isobaric process, the heat supplied to a gas is converted into:

a) Work done by the gas

b) Work done on the system

c) An increase in pressure of the gas

d) Any of the above

18 / 60

18. Which parameter remains constant during an isothermal process?

a) Temperature

b) Average kinetic energy

c) Pressure

d) Both a and b

19 / 60

19. All the heat supplied to a gas is converted into work during:

a) Isothermal process

b) Adiabatic process

c) Isobaric process

d) Isochoric process

20 / 60

20. The internal energy of an ideal gas is related to:

a) Heat

b) Temperature

c) Pressure

d) Both a and b

21 / 60

21. If 1000 J of energy is removed from a gas and the gas does 600 J of work, what is the change in internal energy?

a) . +1000 J

b) –1000 J

c) +1600 J

d) –1600 J

22 / 60

22. A person raises the temperature of a 10 kg solid from 20°C to 40°C using 1000 J of heat. What is the specific heat capacity of the solid?

a) 5 J/kg·°C

b) 50 J/kg·°C

c) 10 J/kg·°C

d) 100 J/kg·°C

23 / 60

23. During the vaporization process, when a liquid changes to vapor, the temperature:

a) Increases

b) Decreases

c) May increase or decrease

d) Remains constant

24 / 60

24. The specific heat of a gas during an isothermal process is:

a) Zero

b) Infinite

c) Between zero and infinity

d) Cannot be determined

25 / 60

25. The specific heat of a gas during an adiabatic process is:

a) Infinite

b) Zero

c) Between zero and infinity

d) Cannot be determined

26 / 60

26. Which of the following is an example of an adiabatic process?

a) Vaporization of water

b) Solidification of water

c) Sublimation of ice

d) Propagation of sound waves in air

27 / 60

27. Which of the following remains constant during an adiabatic process?

a) Heat

b) Entropy

c) Efficiency

d) None of the above

28 / 60

28. The work done in an isobaric process is given by:

a) pΔV

b) pΔT

c) VΔp

d) VΔT

29 / 60

29. The largest unit of energy is:

a) Erg

b) Joule

c) Calorie

d) Electron volt

30 / 60

30. If the mass of water is doubled, the specific heat capacity will:

a) Increase

b) Decrease

c) Remain the same

d) Cannot be determined

31 / 60

31. In which process is the work done equal to zero?

a) Cyclic

b) Isochoric

c) Isobaric

d) Both a and b

32 / 60

32. In which process does the line on the graph appear parallel to the volume axis?

a) Isochoric

b) Isobaric

c) Isothermal

d) Adiabatic

33 / 60

33. In adiabatic expansion, the change in internal energy is:

a) Positive

b) Negative

c) Zero

d) Cannot be determined

34 / 60

34. In which process is the slope of the P–V graph infinite?

a) Isochoric

b) Isobaric

c) Adiabatic

d) Isothermal

35 / 60

35. The ratio of work done in isochoric to isobaric process is:

a) Greater than 1

b) Less than 1

c) Zero

d) Infinite

36 / 60

36. The heat capacity of a material depends on:

a) Chemical composition

b) Mass

c) Phase (state of matter)

d) . All of the above

37 / 60

37. In adiabatic compression of a gas:

a) Internal energy of the gas is used to do work

b) Law of conservation of energy is violated

c) Work is used to increase internal energy

d) No work is required for compression

38 / 60

38. In an isothermal process, if the volume of a gas decreases:

a) Internal energy of the system decreases

b) Internal energy of the system increases

c) Internal energy of the system remains the same

d) Cannot be determined

39 / 60

39. 20 J of energy is supplied to a closed container of gas, causing the lid to rise 2 m under a force of 3 N. What is the change in internal energy of the system?

a) 26 J

b) –26 J

c) –14 J

d) 14 J

40 / 60

40. A gas is compressed to one-fourth of its volume via two processes—one isothermal and the other adiabatic. During which process is the work done greater?

a) Isothermal

b) Adiabatic

c) Equal in both

d) Cannot be determined

41 / 60

41. The specific heat capacity of a 10 g substance is 100 J/kg·K. What is the specific heat capacity of 20 g of the same substance?

a) 200 J/kg·K

b) 100 J/kg·K

c) 50 J/kg·K

d) 20 J/kg·K

42 / 60

42. The specific heat capacity of water is 4200 J/kg·K. What is the heat capacity of 10 kg of water?

a) 42 J/K

b) 420 J/K

c) 4200 J/K

d) 42,000 J/K

43 / 60

43. If two substances of the same mass but different heat capacities are heated with the same amount of energy, which will have a greater temperature increase?

a) The one with higher heat capacity

b) The one with lower heat capacity

c) Both will have the same increase

d) Cannot be determined

44 / 60

44. If the temperature of 0.1 kg of iron is increased by 10 K and its specific heat capacity is 500 J/kg·K, how much energy is required?

a) 100 J

b) 500 J

c) 1000 J

d) 5000 J

45 / 60

45. A P–V indicator diagram showing a straight line parallel to the volume axis represents which process?

a) Isobaric

b) Isochoric

c) Isothermal

d) None of the above

46 / 60

46. An ideal gas expands through three different processes. In which of the following is the work done the greatest?

a) Isobaric

b) Isochoric

c) Isothermal

d) Adiabatic

47 / 60

47. In the isothermal compression of a gas:

a) The temperature of the gas increases

b) Heat flows from the surroundings into the gas

c) Heat flows from the gas into the surroundings

d) No heat is exchanged

48 / 60

48. Which of the following is not an intrinsic property?

a) Heat capacity

b) Specific heat capacity

c) Molar heat capacity

d) None, all are intrinsic properties

49 / 60

49. The heat capacity of a substance is:

a) Directly proportional to the change in temperature

b) Directly proportional to the square of the temperature change

c) Inversely proportional to the change in temperature

d) Inversely proportional to the square of the temperature change

50 / 60

50. Work done by the system is taken as:

a) Positive

b) Negative

c) Zero

d) Cannot be determined

51 / 60

51. If the heat released is 100 and work done on gas is 50, what is a change in the internal energy of the system?

a) 100

b) 50

c) -50

d) -100

52 / 60

52. If a gas releases 10J energy and the work done on the gas is 5J. If the initial energy of gas is 20, what will be the final energy of gas?

a) 15

b) 20

c) 10

d) 5

53 / 60

53. Which of the following statements is/are correct?

a) Area under Process-1 shows workdone on system

b) Area under process-2 shows workdone on system

c) Area under Process-1 shows heat absorbed by system

d) Area under Process-2 shows heat absorbed by system

54 / 60

54. Which of the following is correctly matched regarding different thermodynamic processes shown in the diagram?

a)
AB_ Isobaric process
AC_ Isothermal proces
BC_ Isochoric process

b)
AB_ Isothermal proces
AC_Isobaric process
BC _Isochoric process

c)
AB_Isothermal proces
AC _Isochoric process
BC _isobaric

d)
AB_isobaric
AC Isochoric process
BC Isothermal proces

55 / 60

55. Which of the following is correct about work done?

a) Workdone is negative in process-1

b) workdone is negative in process-2

c) workdone is negative in both process

d) workdone is positive in both process

56 / 60

56. A thermodynamic system reaches from A to D through two paths, A-->B-->C-->D and A-->D as
shown in the figure, then which statement is correct?

a) In both paths work is same

b) In both paths change in iternal energy is same

c) In both paths heat supplied is same

d) All of these

57 / 60

57. In the following thermodynamic process,, the work done during Isobaric expansion is:

a) 0

b) 10

c) 20

d) 30

58 / 60

58. In the following thermodynamic process Workdone during Isochoric process is:

a) 0

b) 10

c) 20

d) 30

59 / 60

59. A system has initial internal enegy 50J.If 100J heat is added and 20J is workdone on system.what is final internal energy of system?

a) 170

b) 150

c) 130

d) 100

60 / 60

60. Through which of the following processes work done is maximum?

a) from A to B

b) from C to D

c) from B to C

d) From A to C

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