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. Which of the following is NOT a conductor?

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

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

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

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

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

10. 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

11. 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

12. 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

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

  • insulation.
  • Radiation
  • Conduction
  • Convection

14. 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

15. 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

16. 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

17. The amount of thermal energy required to raise the temperature of one (1) kilogram of a substance by 1o C is known as:

  • Specific heat
  • Heat of fusion
  • Heat of vaporization
  • Melting point

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

  • 2
  • 4
  • 8
  • 16

19. The value of cp/cv for air is

  • 1
  • 1.4
  • 1.45
  • 2.3

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

  • 1/4
  • Zero
  • 1/5
  • 2

21. Thermal energy always moves:

  • From a high temperature object to a lower temperature object.
  • From a lower temperature object to a higher temperature object.
  • From an object with lower kinetic energy to an object with higher kinetic energy.
  • From an object of higher mass to an object of lower mass.

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

  • True
  • False

23. 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

24. 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

25. 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

26. 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.

27. 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

28. The heat from a hot burner to a pot is transferred by ______.

  • convection
  • insulation
  • radiation
  • conduction

29. 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

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

  • conduction
  • convection
  • radiation
  • insulation

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

  • Thermal
  • Potential
  • Kinetic
  • Gravitational

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

  • gas
  • solid
  • liquid

33. Exothermic reactions...

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

34. 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

35. 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

36. 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

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

  • temperature
  • conduction
  • radiation
  • heat 

38. A steady force pushes in the piston of a well-insulated cylinder. In this process, the temperature of the gas

  • Increases
  • Stays the same
  • Decreases
  • Not enough info

39. In physics, there is no such thing as

  • heat
  • cold
  • energy
  • temperature

40. 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

41. 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

42. When thermal energy is added to a substance, the substance's particles move:

  • More rapidly at an increased diestance from each other.
  • More rapidly with less distance between each other.
  • More slowly with a greater distance between each other.
  • More slowly with a reduced distance between each other.

43. The energy transferred between the particles of two objects because of the temperature difference between the two objects is called ________________.

  • heat
  • insulator 
  • conductor 

44. The Law of Conservation of Energy states:

  • Energy can created or destroyed but not transformed 
  • Energy cannot be created or destroyed, it can only transformed
  • Energy can't be created, destroyed or transformed

45. The unit for HEAT (thermal energy)

  • Calories
  • Cal/gram degree Celsius
  • Degrees Celsius

46. Celsius Scale

  • water freezes at 0 degrees and boils at 100 degrees
  • water boils at 212 degrees and freezes at 32 degrees
  • Water boils at 273 degrees and boils at 373 degrees

47. The variable foe HEAT

  • Q
  • C
  • T

48. The variable for Specific Heat

  • Q
  • C
  • T

49. Geothermal uses _______ to heat and cool a home

  • The internal energy of the earth
  • natural gas
  • Solar energy

50. Thermal energy always travels from ______ temperatures to ______ temperatures.

  • Higher / Lower
  • Lower / Higher
  • Higher / Higher

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