Light & Optics MCQs with Answers

Past Paper MCQ

What is the cause of rainbow?

• A.Rain drops
• B.Dust particles
• C.Ice crystals
• D.Clouds

A blue shirt reflects which color?

• A.Red
• B.Green
• C.Blue
• D.All colors

A Reflecting telescope consists of _?

• A.A concave objective and a convex eyepiece
• B.A convex objective and a concave eyepiece
• C.Two convex lenses only
• D.A primary and a secondary mirror

Which of the following occurs when light passes through a substance unchanged?

• A.Absorption
• B.Reflection
• C.Transmission
• D.Refraction

Myopia can be corrected by using which kind of lens?

• A.Convex lens
• B.Cylindrical lens
• C.Concave lens
• D.Bifocal lens

Light scattering in colloid system is due to _

• A.Tyndall effect
• B.Brownian motion
• C.Refraction
• D.Diffraction

A convex lens is cut horizontally from the center into two equal parts. What is the focal length of each part?

• A.f/2
• B.2f
• C.f
• D.f/4

Image formed by a plane mirror is?

• A.Real, erect, same size
• B.Real, inverted, diminished
• C.Virtual, inverted, magnified
• D.Virtual, erect, same size

The lines of Paschen series for hydrogen atom lie in the spectral region known as ?

• A.Ultraviolet region
• B.Infrared region
• C.Visible region
• D.X-ray region

The total internal reflection is obtained when angle of incidence of light is than critical angle.

• A.Smaller
• B.Greater
• C.Equal to
• D.None of these