Quiz  /  Thermodynamics Class 9 MCQ Questions With Answers

  • 1. 
    When matter heats up, what does it do?

  • expand
  • contract
  • melt
  • evaporate

  • 2. 
    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

  • 3. 
    Temperature is ...

  • the measure of the average kinetic energy of the molecules of an object
  • The amount of thermal energy it takes to raise one gram of a substance by one degree Celsius.
  • An object’s internal energy

  • 4. 
    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

  • 5. 
    Heat transferred by direct contact is:

  • Conduction
  • Convention
  • Radiation
  • illegal because quarantine

  • 6. 
    True/False: Heat is a type of energy

  • True
  • False

  • 7. 
    Whenever heat is added to a system, it transforms to an equal amount of some other form of energy describes which law of thermodynamics?

  • 1st Law of thermodynamics
  • 2nd Law of thermodynamics
  • 3rd Law of thermodynamics
  • 4th Law of thermodynamics

  • 8. 
    Which of the following is an example of a heat conductor?

  • Steel Pipe
  • Wood Logs
  • Styrofoam Cup
  • The flesh of your enemies

  • 9. 
    The energy transferred between the particles of two objects because of the temperature difference between the two objects is called ________________.

  • heat
  • insulator
  • conductor

  • 10. 
    Fahrenheit scale

  • The temperature scale that is used only in America and 2 countries in the Caribbean.
  • The temperature scale that has water freeze at zero degrees and boil at 100 degrees
  • The temperature scale that has water freeze at 273 K and boil at 373 K.

  • 11. 
    Radiation

  • The transfer of thermal energy as electromagnetic waves
  • The transfer of thermal energy through solids
  • The transfer of thermal energy through liquids and gases

  • 12. 
    Do molecules generally move faster at 45 C or 106 C?

  • 45 C because molecules have more energy than in 106C
  • 106 C because molecules have more energy than in 45C
  • 106 C because molecules have less energy than in 45C
  • 45C because molecules have less energy than in 106 C

  • 13. 
    Heat will never flow from a cold object to a hot object on its own describes which law of thermodynamics?

  • 1st Law of thermodynamics
  • 2nd Law of thermodynamics
  • 3rd Law of thermodynamics
  • 4th Law of thermodynamics

  • 14. 
    Conduction

  • The transfer of thermal energy through solids
  • The transfer of thermal energy through liquids and gases
  • The transfer of thermal energy as electromagnetic waves

  • 15. 
    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

  • 16. 
    The diagram represents which type of reaction

  • endothermic
  • exothermic

  • 17. 
    Is the reaction exothermic or endothermic? H2 + S + O2 -> H2SO4 ΔH = -811.13kJ

  • ΔH is negative so it is exothermic
  • ΔH is positive so it is exothermic
  • ΔH is positive so it is endothermic
  • ΔH is negative so it is endothermic

  • 18. 
    The measure of average kinetic energy of all the particles within an object is called ____________.

  • temperature
  • conduction
  • radiation
  • heat

  • 19. 
    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

  • 20. 
    Which of the following is not a scale used to measure temperature?

  • Fahrenheit
  • Celsius
  • Kelvin
  • Thermodynamic

  • 21. 
    The 1st law of Thermodynamics

  • Energy can not be created or destroyed. It just changes forms.
  • Energy can only be created by the sun
  • Some energy is lost to the environment.

  • 22. 
    H2 + 2 C + N2 + 270.3 kJ --> 2 HCNIs this reaction endothermic or exothermic?

  • Endothermic
  • Exothermic

  • 23. 
    Conductor

  • A material that thermal energy travels through easily
  • A material that energy does NOT transfer through easily
  • Energy that travels in the form of electromagnetic waves

  • 24. 
    Thermal energy always travels from ______ temperatures to ______ temperatures.

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

  • 25. 
    Geothermal uses _______ to heat and cool a home

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

  • 26. 
    Specific Heat is..

  • the temperature initial minus temperature final
  • the amount of heat/energy required to raise 1 gram of a substance by 1°C (or K) aka "C"
  • the temperature final minus temperature initial
  • the item in a system with given weight in grams
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