निम्नलिखित

The atom of an element contains 2 electrons in its M-shell. The element is:

A piece of wood is held under water. The up thrust on it will be:

A cylindrical metal wire is reformed so that its length decreases by 20% with no change of volume. Its

resistance decreases by:

A sulphide ore is converted into metal oxide by which of the following process?

The base of the modern periodic table is

The correct option, if speeds of gamma rays, X-rays and microwave are Vg, Vx an Vm respectively will be

Which vitamin is also known as Vitamin-B2?

Which of the following is the first organic compound that was synthesised in the laboratory?

Electrostatic precipitator is used to control —

Which of the following are environment-friendly practices ?