Which is the most abundant element in the Earth's crust?
Which element is abundant in a living body?
Which protien is present in human blood?
Of the following human inhabitants of different climatic regions, whose weight is on an average the heaviest?
Which harmful gas is released by factories an automobiles?
(A) Sulphur dioxide
(B) Carbon dioxide
(C) Nitrogen dioxide
(D) Carbon monoxide
Which gas is also known as 'laughing gas'?
(A) Nitrogen dioxide
(B) Nitrous oxide
(C) Nitrogen monoxide
Which mineral is nicknamed 'fool's gold' because its yellow colour often confuses gold prospectors?
Of the following types of rays coming from the Sun, which type can be converted into electric energy for household needs?
(A) Infrared rays
(C) Ultraviolet rays
(D) Gamma rays
What is the largest known diamond?