Quiz  /  Thermodynamics Class 12 MCQ Questions With Answers

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

  • expand
  • contract
  • melt
  • evaporate

  • 2. 
    Heat transferred by direct contact is:

  • Conduction
  • Convention
  • Radiation
  • illegal because quarantine

  • 3. 
    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

  • 4. 
    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

  • 5. 
    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.

  • 6. 
    H2 + 2 C + N2 + 270.3 kJ --> 2 HCNIs this reaction endothermic or exothermic?

  • Endothermic
  • Exothermic

  • 7. 
    Thermal energy always travels from ______ temperatures to ______ temperatures.

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

  • 8. 
    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

  • 9. 
    1200 J of heat are added to a sample of gas while the gas does 400 J of work on the environment. What is the change in internal energy of the gas?

  • 800 J
  • 1600 J
  • -800 J
  • -1600 J

  • 10. 
    The 1st Law of Thermodynamics says that temperature exists

  • True
  • False

  • 11. 
    2nd law of thermodynamics

  • Every time energy changes form, some of it is lost to the environment
  • Energy can't be created or destroyed
  • All energy generates heat

  • 12. 
    Heat transferred by currents in a liquid or gas is:

  • Conduction
  • Convention
  • Radiation
  • Icky

  • 13. 
    If the temperature of a gas increases and there is negative work done on the gas, then...

  • there must be heat added to the gas
  • the gas must be giving off heat to the environment.
  • this is an adiabatic process.
  • there must be less heat added than the work done on the gas.

  • 14. 
    The first law of thermodynamics is a restatement of the

  • Zeroth law of thermodynamics
  • law of heat addition
  • principle of entropy
  • conservation of energy

  • 15. 
    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

  • 16. 
    Which of the following is an example of convection?

  • A hair dryer is drying up your hair.
  • When the AC or heater changes the temperature.
  • When a car engine turns hot after being turned on.
  • When you are making soup and the water is rising and lowering.

  • 17. 
    What is the name of the process in which pressure remains constant.

  • Isochoric process
  • Adiabatic process
  • Isobaric process
  • Isolated process

  • 18. 
    Warm air rises and cold air sinks demonstrates what?

  • conduction
  • convection
  • radiation
  • refrigeration

  • 19. 
    The variable foe HEAT

  • Q
  • C
  • T

  • 20. 
    Process B on the PV diagram is an ______________ process.

  • adiabatic
  • isobaric
  • isochoric
  • isothermal

  • 21. 
    A thermodynamic system where no exchange of heat takes place between system and surrounding is...

  • Isothermal process
  • Adiabatic process
  • Isobaric process
  • Isochoric process

  • 22. 
    In physics, there is no such thing as

  • heat
  • cold
  • energy
  • temperature

  • 23. 
    How many laws of thermodynamics are there?

  • a lot
  • 3
  • 4
  • 1

  • 24. 
    Pistons moving in a car is an example of an adiabatic process

  • True
  • False

  • 25. 
    Warm air rises and the cool air sinks demonstrates this type of heat transfer.

  • conduction
  • convection
  • radiation
  • Insolation

  • 26. 
    In Isothermal process which property remains constant

  • Volume
  • Pressure
  • Concentration
  • Temperature

  • 27. 
    Thermal Energy is...

  • The internal energy of an object
  • The temperature of a solid object
  • Heat transfer through a liquid
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