A photoelectric cell converts ?

A. Light energy into electrical energy

B. Electrical energy into light energy

C. Heat energy into electrical energy

D. Chemical energy into light energy

Everyday Science · Physics in Everyday Life · page 2 of 44

Light & Optics MCQs with Answers

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Light & Optics (incl. Lenses) MCQs (11–20)

10 MCQs with answers and a short one-liner. Hide answers to test yourself.

Past paper MCQs in this chapter · See all past papers

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11.
The light of one single colour is called _?
Correct Answer: D. Monochromatic
One-liner
Light consisting of only one single colour or wavelength is called monochromatic light.
12.
A photoelectric cell converts ?
Correct Answer: A. Light energy into electrical energy
One-liner
A photoelectric cell converts light energy into electrical energy.
13.
Past Paper MCQ
When light enters one spectrum and transfers to different places, it is called:
Correct Answer: C. Dispersion
One-liner
The splitting of light into its constituent colors (spectrum) when it passes from one medium to another is called dispersion.
14.
A magnifying glass is also called ?
Correct Answer: A. Simple microscope
One-liner
A magnifying glass is also called a simple microscope.
15.
The resolving power of a lens is expressed by which relation?
Correct Answer: A. θ = 1.22 λ/D
One-liner
The resolving power of a lens is given by the relation θ = 1.22 λ/D, known as the Rayleigh criterion.
16.
Which of the following is NOT a use of optical fibres?
Correct Answer: C. Cooking
One-liner
Optical fibres are used for transmitting light signals in communication and medical imaging, but cooking is not one of their applications.
17.
Which of the following is used in a magnifying glass?
Correct Answer: A. Convex lens
One-liner
A magnifying glass uses a convex lens to produce an enlarged, upright virtual image of an object.
18.
Light travelling in a straight line when it strikes the surface of another medium.
Correct Answer: D. Reflects
One-liner
Light travelling in a straight line reflects when it strikes the surface of another medium.
19.
The type of lens in our eye is ?
Correct Answer: B. Convex
One-liner
The type of lens in our eye is convex.
20.
What is the reason for the blue color of the sky?
Correct Answer: C. Dispersion of light
One-liner
The blue color of the sky is due to the dispersion of light (Rayleigh scattering), where shorter blue wavelengths are scattered more by atmospheric particles.

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Light & Optics MCQs with Answers

Light & Optics (incl. Lenses) MCQs (11–20)

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