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Q:

The rotational effect of a force on a body about an axis of rotation is described in terms of

A) Centre of gravity B) Centripetal force
C) Centrifugal force D) Moment of force
 
Answer & Explanation Answer: D) Moment of force

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Q:

Radiocarbon is produced in the atmosphere as a result of

A) collision between fast neutrons and nitrogen nuclei present in the atmosphere B) action of ultraviolet light from the sun on atmospheric oxygen
C) action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere D) lightning discharge in atmosphere
 
Answer & Explanation Answer: A) collision between fast neutrons and nitrogen nuclei present in the atmosphere

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Q:

The basic reason for the extraordinary sparkle of suitably cut diamond is that

A) it has well defined cleavage planes B) it has a very high transparency
C) it has a very high refractive index D) it is very hard
 
Answer & Explanation Answer: C) it has a very high refractive index

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Q:

The speed of light will be minimum while passing through

A) water B) vaccum
C) air D) glass
 
Answer & Explanation Answer: D) glass

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Q:

In case of uniform circular motion, the acceleration is

A) Variable in magnitude but constant in direction B) Constant in magnitude and directed radially inwards
C) Variable in magnitude but tangential to the circle D) Zero
 
Answer & Explanation Answer: A) Variable in magnitude but constant in direction

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Q:

The information of brilliant colors in a thin soap film is a consequence of the phenomena of

A) Polarization and interference B) Diffraction and dispersion
C) Multiple refraction and dispersion D) Multiple reflection and interference
 
Answer & Explanation Answer: D) Multiple reflection and interference

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Q:

The working of the quartz crystal in the watch is based on the

A) Piezo - electric Effect B) Edison Effect
C) Photoelectric Effect D) Johnson Effect
 
Answer & Explanation Answer: A) Piezo - electric Effect

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Q:

Optical fiber works on the principle of

A) Scattering B) interference
C) total internal reflection D) refraction
 
Answer & Explanation Answer: C) total internal reflection

Explanation:

Optical_fiber_works_on_the_principle_of1556277954.jpg image

 

Optical fiber works on the principle of total internal reflection.

 


The Total Internal Reflection is the phenomenon in which the complete reflection of a light ray reaching an interface with a less dense medium when the angle of incidence exceeds the critical angle.

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