Question 16: Entropy has often called “time arrow”. Explain. ANSWER Entropy is often called “time-arrow” because it requires a particular direction of time; with the…
Question 17: Can specific heat of a gas be zero or infinity? Can specific heat be negative? ANSWER Specific heat of a substance is defined…
Question 18: An inventor claims to have developed a heat engine, working between 27° and 227° having an efficiency of 45%. Is the claim valid?…
Question 3: A thermometer is placed in direct sun light. Will it read the temperature of air or of the sun or something else? ANSWER…
Question 4: The pressure in a gas cylinder containing hydrogen will leak more quickly than if it is containing oxygen. Why? ANSWER Hydrogen molecule is…
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…
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…
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…
Question 8: Why does the pressure of the air in automobile tire increases if the automobile is driven for a while? ANSWER We know that…
Question 9: On removing the valve, the air escaping from the cycle tube cools. Why? ANSWER Air in a cycle tube is contained in a…