Questions

The metal ball can be considered  to be made up of several layers of thinner ones. On heating each of these layers will increase in radius. As the inner most layer also increases its radius, the volume inside it i.e, the volume of the hollow portion will also increase.

Kanyakumari is nearest to the Tropic of Capricorn, and the sun's rays fall vertically here during December.

Sikhism was founded by Guru Nanak Dev ji. And the holy city of Sikhs, Amritsar was founded by Guru Ram Das Ji.

Tooth Enamel is the hardest and most highly mineralized substance in the human body. It is a tissue and not a bone. This tissue has high mineral content which makes it hardest substance.

Femur and Temporal bone of the skull are the hardest bones of the human body.