What is the focal length of a double convex lens for which the radius of curvature of each surface is 30 cm and the refractive index of glass is 2.50 ?

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

Inactive Nitrogen and Argon gases are usually used in electric bulbs in order to

Which of the following solutions will not change the colour of blue litmus paper to red?

 1. Acid solution

2. Base solution

What is myopia?

What is the primary component of natural gas?

Among petroleum refinery products, which has the lowest boiling point?

Which type of tissue in humans transports oxygen to the body's cells?

Intensity of gravitational field of earth is maximum at –