CBSE Champion Class 12 Physics. We covered all the CBSE Champion Class 12 Physics MCQs in this post for free so that you can practice well for the exam.
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CBSE Champion Class 12 Physics Objective for Students
The optical phenomenon that is responsible for the propagation of a light signal through an optical fiber is
(a) interference
(b) scattering
(c) total internal reflection
(d) refraction
Option c – total internal reflection
Optical fibers, though bent in any manner, allow light to pass through. What is the inference that one can draw from it?
(a) The concept that light travels in a straight path is wrong.
(b) Light can flow through the optical fibers.
(c) Light can travel through the fibers because of their ductility.
(d) Light can travel through the fibers due to multiple total internal reflections.
Option d – Light can travel through the fibers due to multiple total internal reflections
In total internal reflection, the light travels from
(a) rarer to denser medium and it occurs with no loss of intensity.
(b) denser to rarer medium and it occurs with no loss of intensity.
(c) rarer to denser medium and it occurs with a loss of intensity.
(d) denser to rarer medium and it occurs with a loss of intensity.
Option d – denser to rarer medium and it occurs with a loss of intensity
Light rays move in straight lines. But through an optical fiber, they can move in any type of zig-zag path because
(a) the holes through the fibers are extremely fine.
(b) light rays are absorbed at the entry end and relieved at the exit end of the fiber.
(c) scattering of light occurs inside the fiber.
(d) successive total internal reflections occur as a ray moves through the fiber.
Option d – successive total internal reflections occur as a ray moves through the fiber
The brilliance of the diamond is due to
(a) interference of light.
(b) diffraction of light.
(c) polarization of light.
(d) total internal reflection of light.
Option d – total internal reflection of light
In which of the following cases can Total Internal Reflection (when the angle of incidence is greater than the critical angle) take place?
(a) Glass of Diamond
(b) Air to Water
(c) Air to Glass
(d) Diamond to Air
Option d – Diamond to Air
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