The commercial unit of Energy is:

The energy possessed by a body due to its position is called:

Which of the following device converts chemical energy in to electrical energy?

Unit of work is

A flying jet possess which type of energy

The device used to convert solar energy into electricity is

One Kilowatt hour is equal to-

Energy stored in a spring in watch-

Electromagnetic waves with the shorter wavelength is

Colours that appear on the upper layer of oil spread on road is due to

working principle of Optical Fibre

Refractive index of diamond

The twinkling of star is due to:

Wave theory of light was proposed by

Quantum theory was put forward by

The colour used in fog lamp of vehicles

Albert Einstein won the Nobel Prize in 1921 for the scientific explanation of

The colour of sky in Moon

Particles which travels faster than light are

Study of light

. A rear view mirror in a car or motorcycle is a

While shaving, a man uses a

What is the refractive index of water?

Cyan, yellow and magenta are

Reflection obtained from a smooth surface is called a ---.

Light can travel in

We see the image of our face when we look into the mirror. It is due to:

Angle between incident ray and normal ray is called angle of

An instrument which enables us to see things which are too small to be seen with naked eye is called

An incident ray is:

Name a metal which is the best reflector of light?

Normal, incident ray and reflective ray lie at a same point in

Why light is said to have a dual nature?

What colour of light is formed when red, blue and green colours of light meet in equal proportion?

Which of the following are primary colours?

In the human eye, the focal length of the lens is controlled by

The total internal reflection prisms are used in

What is the focal length of a curve mirror is it has a radius of curvature is 40 cm.

Which type of mirror used in the headlight of a motorcycle?

Which type of mirror used in the dental clinic?

Which of the following has the highest wavelength?

The physical quantity which remains constant in case of refraction?

What is the relation between the radius of curvature and the focal length of a mirror?

The refractive index of a medium with respect to vacuum is

Which colour suffers the maximum deviation, when white light gets refracted through a prism?

Snell’s law is valid for ?

On comparing red and violet, which colour has more frequency?

Deviation of light, that passes through the centre of lens is

The split of white light into 7 colours by prism is known as

What is the speed of light in free space?