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Chapter 10, Short Questions PHYSICS
Class 11 Short Questions
Chapter 10

 Question 1 Why is the earth not in thermal equilibrium with the sun? See Answer. Question 2 When a block with a hole in it is heated, why does not the material around the hole expand into the hole and make it small? See Answer. Question 3 A thermometer is placed in direct sunlight. Will it record the temperature of the air, ot of the sun, or of something else? See Answer. Question 4 The pressure in a gas cylinder containing hydrogen will leak more quickly than if it is containing oxygen. Why? See Answer. Question 5 What happens to the temperature of a room in which an air conditioner is left running on a table in the middle of the room? See Answer. Question 6 When a sealed thermo flask bottle full of hot coffee is shaken, what are the changes, if any in, (a) The temperature of the coffee. (b) The internal energy of the coffee. See Answer. Question 7 When an object is heated, not all the energy it absorbs goes into increasing the velocity of the molecules. Explain where does the remaining energy go. See Answer. Question 8 Why does the pressure of the air in automobile tyre increases if the automobile is driven for a while? See Answer. Question 9 On removing the valve, the air escaping from the cycle tube cool. Why? See Answer. Question 10 Can a room be cooled by leaving the door of an electric refrigerator open? See Answer. Question 11 What are the conditions for a process to be reversible? See Answer. Question 12 What are the limitations of the first law of thermodynamics? See Answer. Question 13 Is it possible, according to the 2nd law of thermodynamics, to construct a heat engine that is free from thermal pollution? See Answer. Question 14 When two systems are in thermal equilibrium, do they have the same amount of K.E. See Answer. Question 15 Work can be converted into heat, so can heat be converted completely into work? See Answer. Question 16 Entropy has often called as ‘time arrow’. Explain. See Answer. Question 17 Can specific heat of a gas be zero. Can specific heat of a gas be infinity? Can specific heat of a gas be negative? See Answer. Question 18 An inventor claims to have developed a heat engine working between 27°C and 227°C having an efficiency of 45%. Is the claim valid? Why? See Answer.