FSc ICS Notes Entry Test Exam Solution MCAT ECAT Physics First Year Chapter 11 Heat and Thermodynamics Multiple Choice Question (MCQ) 1st Year Physics Notes Online Taleem Ilm Hub
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1. The centigrade and Fahrenheit scales will have the same reading when the temperature is:- 70
- -80
- -40
- 120
2. The Fahrenheit and kelvin scale will have the same reading when the temperature is:
- 370
- 574.25
- 414.5
- 388
3. Fahrenheit scale was originally used in:
- Meteorology
- Clinical thermometer
- Clinical thermometer and meteorology
- None of these
4. A gas which strictly obeys the gas laws under all conditions of temperature and pressure is called:
- Real gas
- Ideal gas
- Inert gas
- None of these
5. The motion of molecules in gases is:
- Orderly
- Random
- Circular
- All of these
6. At constant temperature, if the density of the gas is increased, its pressure will:
- Decrease
- Increase
- Remains unchanged
- None of these
7. If a molecule will momentum mv strikes a wall and rebound then the change in momentum will be:
- -2mv
- Zero
- 2mv
- mv
8. Given that P=10(4) N/m2, area of the piston = 0.1 m(2) and distance moved by the piston = 10(-1) cm, then the work done by the gas is:
- 1J
- 10(5)J
- 10(4)J
- 10J
9. If Cv denotes molar specific heat at constant volume and ?T is the change in the temperature, then Cv∆T gives:
- Volume
- Pressure
- Energy
- Entropy
10. If temperature of the sink is decreased, efficiency of a Carnot engine:
- Remains constant
- Decreases
- Increases
- None of these
11. One degree of thermodynamic scale is equal to ________ of the temperature triple point of water.
- 1/273 th
- 1/100 th
- 1/273.16 th
- 1/32 th
12. The unknown temperature T on thermodynamic scale in kelvin is given by the formula:
- T = 273.16Q/Q3
- T = 32Q/Q3
- T = 100Q/Q3
- T = 273Q/Q3
13. A certain engine converts 20% of available heat into work. Then its efficiency will be:
- 20%
- 80%
- 50%
- None of these
14. Number of spark plugs needed in diesel engine is:
- Four
- Five
- Six
- None of these
15. Most motorbikes have ________ cylinder/s engine but cars usually have cylinders on the same crankshaft.
- Four, six
- One, four
- Two, five
- None of these
16. A constant volume gas thermometer works on:
- Archimedes principle
- Pascal's law
- Boyle's law
- Charles law
17. The ratio of coefficients of cubical expansion and linear expansion is:
- 1:1
- 3:1
- 2:1
- None of these
18. When a copper ball is heated, the largest percentage in crease will occur in its:
- Diameter
- Area
- Volume
- Density
19. Sea animals are safe in winter in cold countries because of:
- Their body conditions
- High specific heat of water
- Low conductivity of water
- Anomalous expansion of water
20. The volume expansion coefficient is:
- Equal to temperature
- Proportional to square root of temperature
- Inversely proportional to square root of temperature
- Inversely proportional to temperature
21. Heat is transferred most rapidly by the process of:
- Conduction
- Convection
- Radiation
- Combustion
22. When water is heated from 0 degree to 10 degree Celsius, its volume:
- Increases
- Decreases
- Does not change
- Data is insufficient
23. First law of thermodynamic concerns conservation of:
- Heat
- Work
- Momentum
- Energy
24. When 110J of heat is added to a gaseous system, internal energy increases by 40J; the amount of work done is:
- 150J
- 70J
- 110J
- 40J
25. Molar specific heat at constant volume Cv for a mono-atomic gas is:
- 3/2 R
- 5/2 R
- 6/2 R
- 4/2 R
26. A sink, that is a system where heat is rejected, is essential for the conservation of heat into work. From which law the above inference follows?
- Zeroth
- First
- Second
- Third
27. The first operation involved in a Carnot cycle is:
- Isothermal expansion
- Adiabatic expansion
- Isothermal compression
- Adiabatic compression
28. An ideal heat engine exhausting heat at 77 degree Celsius is to have a 30% efficiency. It must take heat at:
- 127 degree Celsius
- 227 degree Celsius
- 327 degree Celsius
- 673 degree Celsius
29. The work done in an adiabatic change in a particular gas depends upon only:
- Change in volume
- Change in pressure
- Change in temperature
- None of these
30. The gas law Constant = PV/T is true for:
- Isothermal changes only
- Adiabatic changes only
- Both isothermal and adiabatic changes
- Neither for isothermal nor for adiabatic changes
31. The physical quantity which described the level of thermal energy in a body is:
- Temperature
- Heat energy
- Pressure
- Volume
32. The pressure exerted by the gas is directly proportional to:
- Velocity of the molecule
- Density of the gas
- Square of the density
- Square root of the density
33. For an ideal gas system, the internal energy is directly proportional to:
- Pressure
- Volume
- Density
- Temperature
34. The change in internal energy of the system is positive, when the temperature of the system:
- Increases
- Decreases
- Remains constant
- None of the above
35. Water boils at 100 degree Celsius, the corresponding temperature at Fahrenheit scale is:
- 180 Fahrenheit
- 200 Fahrenheit
- 212 Fahrenheit
- 273 Fahrenheit
36. A Celsius degree is larger than a Fahrenheit degree by:
- 5/9
- 9/5
- 9/10
- 9/8
37. Absolute zero is considered as that temperature at which:
- All liquids become gases
- All gases become liquids
- Water freezes
- All gases partially liquefied
38. At constant volume, the graph between P and T is:
- Hyperbola
- Parabola
- Straight line
- Ellipse
39. At constant temperature, if the pressure of the given mass of the gas is doubled, then the density of the gas becomes:
- Double
- 1/4 of the original value
- 1/2 of the original value
- Remains constant
40. An inflated tire suddenly bursts. As a result of this, the temperature of air:
- Increases
- Decreases
- May increase or decrease
- Remains constant
41. When the gas expands isothermally, the work is:
- Done on the gas
- Done by the gas
- Zero
- Negative
42. The SI unit of molar specific heat is:
- Jmol/K
- J/molK
- JK/mol
- J/mol
43. The coefficient of linear expansion of platinum is 9*10(-6) per Coulomb. Its coefficient of volume expansion is:
- 3*10(-6) per Coulomb
- 9*10(-6) per Coulomb
- 18*10(-6) per Coulomb
- 27*10(-6) per Coulomb
44. The SI unit of entropy is:
- J/K
- J/s
- Js/K
- J/K(2)
45. The natural process tends to proceed towards a state of greater:
- Order
- Disorder
- Both order and disorder
- Neither order nor disorder
46. Which of the following is not the function of state?
- Internal energy
- Entropy
- Enthalpy
- Mass
47. Entropy of universe during any natural process:
- Increases
- Increases or remains constant
- Decreases
- Decreases or remains constant
48. When a sphere is heated, then the greatest increase is in its:
- Radius
- Circumference
- Surface area
- Volume
49. Net change in entropy of a system in a Carnot's cycle is:
- Positive
- Negative
- Maximum
- Zero
50. Area under the p-v graph of Carnot engine represents the:
- Heat absorbed
- Heat rejected
- Total work done
- All of the above
51. Temperature of gas is a measure of:
- the average translational kinetic energy of the gas molecule
- the average potential energy of the gas molecules
- the average distance of the gas molecules
- the size of the gas molecules
52. A thermometric liquid which can be used to measure temperature between -40 degree Celsius to 40 degree Celsius is:
- Water
- Alcohol
- Mercury
- Phenol
53. The temperature at which the reading of a Fahrenheit thermometer will be double that of Centigrade thermometer is:
- 160 degree Celsius
- 180 degree Celsius
- 32 degree Celsius
- 100 degree Celsius
54. For measuring temperature near absolute zero, the thermometer used is:
- Thermoelectric thermometer
- Radiation thermometer
- Magnetic thermometer
- Resistance thermometer
55. The absolute zero is the temperature at which:
- Water freezes
- All substances exist in solid state
- Molecular motion ceases
- None of the above
56. Absolute zero (0K) is that temperature at which:
- Matter ceases to exist
- Ice melts and water freezes
- Molecular motion ceases
- None of the above
57. The temperature on Celsius scale is 25 degree Celsius. What is the corresponding temperature on the Fahrenheit scale?
- 40 F
- 77 F
- 50 F
- 45 F
58. The root mean square speed of the molecules of different ideal gases, maintained at the same temperature are:
- Same
- Different
- Zero
- Infinity
59. 'P' is pressure and 'd' is the density of the gas at constant temperature, then:
- P ∝ 1/d
- P ∝ 1/d(2)
- P ∝ d
- P ∝ d(2)
60. The number of molecules per cc of a gas at S.T.P. is:
- 2.68*10(17)
- 2.68*10(19)
- 22400*6*10(23)
- 6*10(23)
61. In winter, the temperature of the inside wall of a room as compared to the temperature of air in the room is:
- Lower
- Higher
- Same
- May be lower or higher depending upon atmospheric pressure
62. Pressure of a gas can be written as:
- 1/3 ρV
- 1/3 V(2)
- 1/3 ρV(2)
- 1/3 ρ(2)V
63. One Kelvin is defined as:
- 1/100 of boiling point of water
- 1/273.16 of melting of ice
- 1/273.16 of boiling point of water
- 1/273.16 of temperature of triple point of water
64. The value of Boltzmann's constant is:
- 1.38*10(-23)J/K
- 1.38*10(23)J/K
- 1.38*10(-23)J/mole-K
- 1.38*10(-23)J/K mole-K
65. For a gas obeying Boyle's law if the pressure is doubled, the volume becomes:
- Double
- One half
- Three fold
- Remains the same
66. If coefficient of linear expansion of a solid is a, its coefficient of cubical expansion will be approximately:
- 2a
- 3a
- 2.5a
- 4a
67. The SI units of specific heat are:
- K cal / kg K
- Cal / gram C
- K cal / kg C
- J / kg K
68. In an adiabatic process:
- Q = ∆U + W
- Q = ∆U
- Q = W
- Q = 0
69. A system does 600 J of work and at the same time its internal energy increased by 320J. How much heat has bee supplied?
- 280J
- 920J
- 600J
- 20J
70. No entropy change takes place in:
- Isothermal process
- Adiabatic process
- Isobaric process
- Isochoric process
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