What will come in place of the question mark (?) in the

The splitting up of white light into seven colours on passing through a glass prism is called as

Smog is a combination of –

The blades of a moving jet engine are an example of:

The apparatus used in the refrigeration is

Sound and light waves both have ___________ .

What is the SI unit of power?

The motion of a freely falling body is an example of ______________ accelerated motion.

Among the following materials, which is not an insulator?

Heat stored in water vapour is –

Which of the following is the time taken for one complete oscillation of a sound wave in the density of the medium?