Draw a labelled diagram of a thermos flask.
Important Questions on Heat and Its Effects
Why is the air removed from the space between the two walls of the glass bottle?
Why is glass bottle held in a place inside the metal case with the help of cork pieces?
Give reasons for the following:
False ceiling keeps the room warm during winters.
Give reasons for the following:
Asbestos sheets are preferred over iron sheets for roofing.
Explain why a clinical thermometer cannot be used to measure high temperature.
A person has a white shirt and a black shirt. Which shirt will make him more comfortable in (a) winters, (b) summers? Give reason for your answer.
Why is water not used instead of mercury in thermometers when it is readily available to us?
The firefighting suits are always bright and shiny. Why?
