1Why should we not put our hands over boiling water?
2Why should hot water not be poured into a glass tumbler during the winter season?
3Why should a glass bottle full of water not be kept in the deep fridge?
4Why should a steel plate covering cooking food not be taken out using bare hands?
5When equal amounts of colour are added to boiled water, tap water and cold water, if the movement of the colour particles is taken to be the same as that of the water molecules, the molecules of which beaker have the fastest movement? Why?
6One hand is kept in lukewarm water and the other in cold water for a minute, then both are placed in tap water. What is observed? Discuss the reason.
7What is thermal energy? On what does it depend?
8What is temperature? Give its SI unit, its commonly used unit and the instrument that measures it.
9What is heat? Give its SI unit and the instrument used to measure it.
10A small pan holds water at 100 °C and a big bucket holds water at 30 °C. Which has more thermal energy? Why?
11Explain the statement 'Heat is not stored in any object.'
12What is thermal equilibrium? Give an example.
13What is absolute zero temperature? What is its value in degrees Celsius?
14Write any three differences between heat and temperature.