Nomination facility in case of lockers is described

If input frequency of a full wave rectifier be n, then output frequency would be-

Electrical fuse is used to interrupt excess of _________.

Lambert's law is related to–

Minimum Distance for proper vision is 

Among the following, which has the lowest density?

The method of transfer of heat in liquid is

In the atmosphere ultraviolet rays are absorbed by –

Why is red colour preferred for danger signal lights?

A concave lens has a focal length 15 cm. If the object is placed at 30 cm from the lens, what is the image distance?

What is the pH of Urine ?