On a cold winter nigth you are asked to sit on a chair. Would you like to choose a metal chair or a wooden chair ? Both are kept in the same lawn and are at the same temperature.

In winter, if we touch steel chair , we feel cold but so when touched wooden chair , though both are at the same temperature. Why?

In an examination hall there are four rows of chairs. Each row has 8 chairs one behind the other. There are two classes sitting for the examination with 16 students in each class. It is desired that i each row, all students belong to the same class and that no two adjacent row are allotted to the same class. In how many ways can these 32 students be seated?

The distance between two point sources of light is 24cm. Find out where would you place a converging lens of focal length 9cm, so that the images of both the sources are formed at the same point.

The space between two chairs is 3 metres. Where would you put a third chair in the middle?

Why does a metal bar appear hotter then a wooden bar at the same temperature ? Equivalently it also appears cooler then wooden bar if they are both colder then room temperature.