राजभाषा की दृष्टि से

Which of the following rock is not sedimentary rock?

Which of the following is NOT an isotope of oxygen?

Sphalerite is an ore/mineral of -

Potassium Permanganate is used for purifying drinking water, because it – 

Which of the following is the best sources for Vitamin D are –

What is the chemical formula for soda ash?

Which of the following is NOT a base?

As an air bubble rises from the bottom of a lake to the surface, it will:

Ultra-purification of metals is achieved using:

What property is shared by isotopes of an element?