An electric iron has a heating element made of:
The chemical bahaviour of an atom depends upon
Which mineral is the ore Of aluminium?
Mercury is a :
When Hydrogen starts burning in air it produces?
Which one of the following contributes largely to the greenhouse effect?
Spirit in contact with body gives cool sensation because it is:
Urea is a —
The particle required to continue the chain process of Uranium fission is:
Which one of the following is not a greenhouse gas?