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11th Standard English Medium Physics Subject Heat and Thermodynamics Creative 3 Mark Questions with Solution Part - I

Published on: 24/06/2021

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Std: 11th Standard - Physics

chapter: - Creative Questions

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Questions:

Generic 3

5 x 3 = 15

A metal tube & a rod of same distance, same material & same outer diameter are given same amount of heat. Which will show less expansion & why?

What is meant by triple point? Give the values of triple point pressure & triple point temperature of water.

Write the conditions for reversible process.

Define cyclic processes

How does the internal energy of a thermodynamic system change?

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Answers Key:

Generic 3

5 x 3 = 15

(i) For a metal tube & a rod of same length, same material & same outer diameter, the mass of rod is more than that of tube.
(ii) When same amount of heat is given to metal tube & a rod, then the temp rise for rod is less, hence expansion for rod is less than that of tube.

(i) It is a point in phase diagram, representing a particular pressure & temperature at which the solid, liquid & vapour phases of the substance can co-exist
(Ii) Triple point pressure of water is 0.46cm of mercury column or 0.066 atm & triple point temperature of water is 273.16K or 0.01⁰C.

(i) The process should proceed at an extremely slow rate.
(ii) The system should remain in mechanical, thermal and chemical equilibrium state at all the times with the surroundings, during the process.
(iii) No dissipative forces such as friction, viscosity, electrical resistance should be present.

(i) This is a thermodynamic process in which the thermodynamic system returns to its initial state after undergoing a series of changes.
(ii) Since the system comes back to the initial state, the change in the internal energy is zero.
(iii) In cyclic process, heat can flow in to system and heat flow out of the system.

Heat flows into the system	Internal energy increases
Heat flows out of the system	Internal energy decreases
Work is done on the system	Internal energy increases
Work is done by the system	Internal energy decreases