## FSc ICS Notes Entry Test Exam Solution MCAT ECAT Physics First Year Chapter 11 Heat and Thermodynamics Multiple Choice Question (MCQ)

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**Both Bold and Underlined option is correct**

**Both Bold and Underlined option is correct**

**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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