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Thermal Properties of Matter — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysicsThermal Properties of Matter1 Mark
Question
A thermos flask containing tea is shaken vigorously considering tea as a system.
  1. Has heat been added to tea?
  2. Has work been done on it?
  3. Has its internal energy changed?
  4. Does its temperature rise?
✓

Answer

  1. No, heat is not transferred as the flask is insulated from the surrounding.
  1. $\therefore\text{dQ}=0$
  2. Yes, work is done in shaking $($against the viscous force$)$, i.e., $\text{DW}$ is negative.
  3. Yes, internal energy of tea increases. As $dU = dQ - dW = 0 - dW$, and $W$ is negative, therefore $dU$ is positive.
  4. Yes, the temperature of tea rises because of increase in internal energy.

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