TNPSC Heat, Light, Sound MCQS Questions | Study Notes - 1

Question: 1

The refractive index of a given piece of transparent quartz is greatest for

(A) Red light

(B) Yellow light

(C) Violet light

(D) Green light

Ans: C

Violet light

Question: 2

Optical fibres are based on

(A) Total internal reflection

(B) Refraction

(C) Scattering

(D) All of these

Ans: A

Total internal reflection

Question: 3

The head mirror used by E.N.T. doctors is

(A) Plano convex

(B) Plane

(C) Concave

(D) Convex

Ans: C

Concave

Question: 4

Which mirror is to be used to obtain a parallel beam of light from a small lamp?

(A) Concave mirror

(B) Plane mirror

(C) Convex mirror

(D) Any one of these

Ans: A

Concave mirror

Question: 5

Angular separation between two colours of the spectrum depends upon

(A) Angle of incidence

(B) Angle of deviation

(C) Size of the prism

(D) All of these

Ans: B

Angle of deviation

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