The speed of electromagnetic rays as compared to speed of light is ?

D. Varies depending on the type of ray

What are xenon bulbs also known as?

A. High intensity discharge bulbs

Which one of the following is true about electromagnetic waves?

C. Require a medium to propagate

D. Cannot travel through vacuum

Everyday Science · Physics in Everyday Life · page 1 of 44

Light & Optics MCQs with Answers

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Light & Optics (incl. Lenses) MCQs (1–10)

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Past paper MCQs in this chapter · See all past papers

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1.
Past Paper MCQ
Mirror is related to reflection in the same way as water is related to
Correct Answer: A. Refraction
One-liner
Mirror is related to reflection just as water is related to refraction, because a mirror reflects light while water bends (refracts) light passing through it.
2.
Past Paper MCQ
The speed of electromagnetic rays as compared to speed of light is ?
Correct Answer: B. Same as speed of light
One-liner
The speed of electromagnetic rays is same as speed of light because light itself is an electromagnetic wave.
3.
The following figure shows the phenomenon of of light.
Correct Answer: D. Refraction
One-liner
The phenomenon shown in the figure is Refraction of light, which is the bending of light as it passes from one medium to another.
4.
When light is refracted, which of the following does not change?
Correct Answer: C. Frequency
One-liner
When light is refracted, its frequency remains unchanged while wavelength, velocity, and direction may all change.
5.
What is the unit of power of a lens?
Correct Answer: A. Diopter
One-liner
The unit of power of a lens is the diopter, which is equal to the reciprocal of the focal length measured in meters.
6.
What are xenon bulbs also known as?
Correct Answer: A. High intensity discharge bulbs
One-liner
Xenon bulbs are also known as High intensity discharge (HID) bulbs.
7.
The theory of wave nature of light was proposed by?
Correct Answer: B. Huygen
One-liner
The wave theory of light was proposed by Christiaan Huygens.
8.
Which one of the following is true about electromagnetic waves?
Correct Answer: A. Transverse in nature
One-liner
Electromagnetic waves are transverse in nature, meaning their electric and magnetic field oscillations are perpendicular to the direction of wave propagation.
9.
Lenses form images through ?
Correct Answer: B. Refraction
One-liner
Lenses form images through refraction, which is the bending of light as it passes from one medium to another.
10.
How many colors are there in a rainbow?
Correct Answer: C. 7
One-liner
A rainbow has 7 colors: red, orange, yellow, green, blue, indigo, and violet (often remembered as ROYGBIV).

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Light & Optics MCQs with Answers

Light & Optics (incl. Lenses) MCQs (1–10)

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