About Thermodynamics

Following are some of the multiple choice questions on the Thermodynamics with answers that will help the students in developing their knowledge.

Thermodynamics MCQ

1. Heat is

  • hot
  • the energy that is transferred between objects because of a temperaturedifference
  • the quantity measure from the average kinetic energy of vibrating molecules in a substance

2. Which of the following has the highest calorific value?

  • Anthracite coal
  • Bituminous coal
  • Peat
  • Lignite

3. How does a refrigerator work?

  • Moves heat from inside the fridge to the room
  • Blows cold air into the fridge
  • Uses convection cells
  • It generates cold air

4. Mixture of ice and water form a

  • Closed system
  • Open system
  • Isolated system
  • Heterogeneous system

5. Addition of heat at constant pressure to a gas results in

  • Raising its temperature
  • Raising its pressure
  • Raising its volume
  • Raising its temperature and doing external work

6. Warm air rises and cold air sinks demonstrates what?

  • conduction
  • convection
  • radiation
  • refrigeration

7. Define Exothermic

  • Energy is released; ΔH is negative; Going from Gas to Liquid, Liquid to Solid
  • Energy is absorbed; ΔH is positive; Going from Gas to Liquid, Liquid to Solid
  • Energy is released; ΔH is positive; Going from Solid to Liquid, Liquid to Gas
  • Energy is absorbed; ΔH is negative; Going from Gas to Liquid, Liquid to Solid

8. Which of the following is NOT a conductor?

  • oven mitt
  • curling iron
  • iron skillet
  • copper pipe

9. Which of the following gas has the highest calorific value?

  • Coal gas
  • Producer gas
  • Mond gas
  • Blast furnace gas

10. The absolute zero pressure can be attained at a temperature of

  • 0°C
  • -273°C
  • 273 K
  • None of these

11. What happens to particles when they are heated?

  • They speed up and spread out
  • They slow down and compress
  • They stop moving
  • They move closer together and speed up

12. When cut-off ratio is ________; the efficiency of Diesel cycle approaches to Otto cycle efficiency

  • 1/4
  • Zero
  • 1/5
  • 2

13. Water has a specific heat of 4184 J/KgºC. Wood has a specific heat of 1760 J/KgºC. What material needs more energy to raise the temperature 1ºC

  • Wood
  • Water
  • Both are the same

14. In closed cycle gas turbine, the air is compressed

  • Isothermally
  • Isentropically
  • Polytropically
  • None of these

15. If a gas is heated against a pressure, keeping the volume constant, then work done will be equal to

  • +ve
  • -ve
  • Zero
  • Anywhere between zero and infinity

16. How are solids different from liquids?

  • particles in solids are moving freely around each other.
  • particles in solids have no motion.
  • particles in solids are vibrating in place.
  • particles in solids have more motion than in liquids

17. Carbonization of coal consists of

  • Drying and crushing the coal to a fine powder
  • Moulding the finely ground coal under pressure with or without a binding material
  • Heating the wood with a limited supply of air to temperature not less than 280°C
  • None of the above

18. The value of cp/cv for air is

  • 1
  • 1.4
  • 1.45
  • 2.3

19. The unit of power in S.I. units is

  • Newton
  • Pascal
  • Erg
  • Watt

20. When applying the first law of thermodynamics to a system, when is heat a positive quantity?

  • when the system does work
  • when the system has work done on it
  • when the system absorbs heat
  • when the system loses heat
  • when no work is done either on the system or by the system

21. The kind of heat transfer that travels through space in electromagnetic waves is ______________________.

  • insulation.
  • Radiation
  • Conduction
  • Convection

22. In physics, there is no such thing as

  • heat
  • cold
  • energy
  • temperature

23. The _____ Law of Thermodynamics says that heat always flows from an object with a higher temperature to an object of lower temperature naturally

  • Zeroth
  • First
  • Second
  • Third

24. DON'T RUSH, YOU HAVE TIME.Frying an egg on a skillet. Referring to the egg, would the Enthalpy change be positive or negative?

  • Skillet is absorbing heat energy from the egg. Absorbing energy is Endothermic. Endothermic has a positive Enthalpy
  • Egg absorbing heat energy from the skillet. Absorbing energy is Endothermic. Endothermic has a positive Enthalpy
  • Egg absorbing heat energy from the skillet. Releasing energy is Exothermic. Exothermic has a positive Enthalpy
  • Egg absorbing heat energy from the skillet. Releasing energy is Exothermic. Exothermic has a negative Enthalpy

25. The measure of average kinetic energy of all the particles within an object is called ____________.

  • temperature
  • conduction
  • radiation
  • heat 

26. DON'T RUSH, YOU HAVE TIME. Water droplets condensing on the inside of a window on a cold day. Is this process exothermic or endothermic?

  • Gases condense to form liquids. Gases are moving faster than liquids, the air around the window has a higher temperature/kinetic energy. Releasing energy to get water droplets, which is is Exothermic
  • Gases condense to form liquids. Gases are moving faster than liquids, the air around the window has a higher temperature/kinetic energy. Releasing energy to get water droplets, which is is Endothermic
  • Gases condense to form liquids. Gases particles are moving slower than liquids. Releasing energy to get water droplets, which is is Endothermic
  • Gases condense to form liquids. Gases particles are moving slower than liquids. Releasing energy to get water droplets, which is is Exothermic

27. Exothermic reactions...

  • Absorb energy
  • Release energy
  • Release Color
  • Absorb Color

28. 7. All phase changes (changing states) requires energy to be added or taken away.

  • True
  • False

29. Heat travels from the sun to the earth by the process of...

  • conduction
  • convection
  • radiation
  • insulation

30. When you place the metal in boiling water, heat flows from the _________ to the _______.

  • metal to the boiling water
  • bottom of the metal to the top half of the metal
  • bottom of the water to the top of the water
  • boiling water to the metal

31. Stored energy that results from the position or shape of an object is called...

  • Thermal
  • Potential
  • Kinetic
  • Gravitational

32. If the specific heat of water is 4,186 J/kg∙°C, how much heat is required to increase the temperature of 1.2 kg of water from 23 °C to 39 °C?

  • -80,371.2 J
  • 44,938.6 J
  • 80,371.2 J
  • 112,575.9 K

33. A sample of iron receives 50.J of heat energy that raises the temperature of the iron 25.0°C. If iron has a specific heat of 0.10 J/g°C, what is the mass of the iron sample?

  • 25 g
  • 30 g
  • 20 g
  • 50 g

34. If I heat up 2 pans of water one has 100 mL in it and one has 1000mL. Which one heats up the fastest?

  • 100 mL
  • 1000 mL
  • They both heat up at the same speed
  • They cool down.

35. How many Joules of energy are required to make 100 grams of ice at 0 οC completely melt? The specific latent heat of fusion of ice is 334000 J/kg

  • 200 J
  • 400 J
  • 33,400 J
  • 2,000,000 J

36. Particles (molecules) in a ______________________ have less energy than the other states of matter.

  • gas
  • solid
  • liquid

37. How much energy is required to completely boil away 150g of 10o C water? Use C = 4.184 J/goC for water, and Hv = 2260 J/g.

  • 56,484 J
  • 339,000 J
  • 395,484 J
  • 385,484 J

38. One molecule of oxygen consists of __________ atoms of oxygen.

  • 2
  • 4
  • 8
  • 16

39. For the same maximum pressure and temperature,

  • Otto cycle is more efficient than Diesel cycle
  • Diesel cycle is more efficient than Otto cycle
  • Dual cycle is more efficient than Otto and Diesel cycles
  • Dual cycle is less efficient than Otto and Diesel cycles

40. Molecular volume of any perfect gas at 600 × 103 N/m² and 27°C will be

  • 4.17 m3/kg mol
  • 400 m3/kg mol
  • 0.15 m3/kg mol
  • 41.7 m3/kg mol

41. An actual engine is to be designed having same efficiency as the Carnot cycle. Such a proposition is

  • Feasible
  • Impossible
  • Possible
  • Possible, but with lot of sophistications

42. What does the "U" stand for the formula ∆U = Q + W

  • Heat
  • Temperature
  • Work
  • Internal energy

43. H2 + 2 C + N2 + 270.3 kJ --> 2 HCNIs this reaction endothermic or exothermic?

  • Endothermic 
  • Exothermic

44. In which of the following systems is entropy increasing?

  • Putting together a puzzle
  • Putting books on a shelf
  • Breaking a plate
  • Filling a jar of salt

45. How can energy be transferred from a cool object to a warm object?

  • Work must be done
  • Increase thermal energy
  • Use convection
  • Q=mTC

46. The 1st Law of Thermodynamics says that temperature exists

  • True 
  • False

47. Which situation best represents convection?

  • Heat from a campfire
  • A hot air balloon taking off
  • Touching a hot piece of metal
  • Getting sunburned

48. The handle of a metal spoon warms up when it is placed in a hot bowl of soup because of

  • Convection
  • Conduction
  • Radiation
  • insulation.

49. A molecule consisting of one atom is known as

  • Mono-atomic
  • Di-atomic
  • Tri-atomic
  • Poly-atomic

50. The entropy may be expressed as a function of

  • Pressure and temperature
  • Temperature and volume
  • Heat and work
  • All of these

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