General Knowledge Objective Type Questions & Answers 2020-2021 - 1

Question: 1

A fixed point lying in between the two spherical surfaces through which a ray of light passing suffers no deviation is

(A) Focal length

(B) Principal axis

(C) Optic centre

(D) Principal focus

Question: 2

The refractive index of glass depends on

(A) The intensity of the incident light

(B) The size of the glass slab

(C) The colour of the incident light

(D) The angle of incidence

Question: 3

Optical fibre is used in

(A) Thermometer

(B) Bioscope

(C) Stethoscope

(D) Endoscope

Question: 4

The critical angle of glass is

(A) 24°

(B) 42°

(C) 45°

(D) 90°

Question: 5

The final image in a compound microscope is

(A) Real and erect

(B) Virtual and erect

(C) Virtual and inverted

(D) Real and inverted