The Zeroth law leads to the concept of
  • temperature
  • heat
  • internal energy
  • work
Suppose we have a box filled with gas and a piston is also attached at the top of the box.What are the ways of changing the state of gas (and hence its internal energy)? Answer could be more than one choice.
  • Bring box in contact with a body with higher temperature
  • Move the box so that it has kinetic energy
  • Pushing the piston down so as to do work on the system
  • a. and c. both.
Which of the following statement is true for a thermodynamical system where ∆U is the increase in internal energy and ∆W work done respectively?
  • ∆U = ∆W in isothermal process
  • ∆U = ∆W in a adiabatic process
  • ∆U= -∆W in case of ideal gas
  • ∆U= -∆W in an adiabatic process
Hot coffee in a thermos flask is shaken vigorously, considering it as a system which of the statement is not true?
  • Temperature of the system rises
  • Internal energy of the coffee increased
  • Heat energy has been added to coffee
  • Work is done on the system
The internal energy and the work done by a system decreases by same amount then
  • a and b both
  • The temperature must decrease
  • The process must be adiabatic
  • The process must be isothermal
Which wall would allow the flow of thermal energy between systems A and B to achieve thermal equilibrium?
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  • Diathermic wall
  • Adiabatic wall
  • Diadiabatic wall
  • Thermal wall
The first law of thermodynamicsIs a restatement of the principle of conservation of energy as applied to heat energyIs the basis for the definition of internal energyIs basis for the definition of temperatureasserts the impossibility of achieving an absolute zero temperature.
  • Both 1 and 2
  • Only 1
  • Both 1 and 3
  • 1,2,4
The First Law of Thermodynamics states that:
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  • A
  • B
  • C
  • D
Internal energy of a system increases by 60 J when 140 Jof heat is added to the gaseous system. The amount of work done would be:
  • 80 J
  • 100J
  • 200 J
  • 140J
First law of thermodynamics tells us:
  • the nature of the process taking place
  • the direction in which a given process can take place
  • to what extent the process takes place
  • that heat supplied is used to carry out the process
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