Which element is used as timekeeper in the atomic clocks? 

Which of the following is also called Marsh Gas?  

As the frequency of a wave increases, what happens to its wavelength? 

Atomic weight of an element is compared with which of the following to get the atomic weight of that element? 

Science of the study of preserved remains or traces of animals, plants, and other organisms from the remote past is called ________.

What is the chemical name of Chalk?

Cadmium pollution is associated with ____?                              

Which poisonous gas was released in Bhopal Gas Tragedy?