The 1st practical electric battery is known as:

That period in which voltage repeats its value in equal intervals is called:

The value of refractive index of water is:

When a ray of light enters from denser medium to rare medium, the angle of incidence for which angle of refraction is 90° is called:

What is the direction of the magnetic field lines inside a bar magnet?

The cathode ray oscilloscope consists of main parts:

If we run a plastic comb through hair and then _bring it near shell pieces of paper. The comb____________

SI unit of electric charge is_______________

A region around the charge in which it exerts electrostatic force on another charge is called

In metals, current is produced only due to the flow of

In electrolyte, current is produced due to the flow of .

The SI unit of electric current is