Physics
Optical fibres are based on the phenomenon of

Interference
Diffraction
Total Internal Reflection
Dispersion

ANSWER DOWNLOAD EXAMIANS APP

Physics
Radiocarbon is produced in the atmosphere as a result of

Lightning discharge in atmosphere.
Action of ultraviolet light from the sun on atmospheric oxygen.
Action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere.
Collision between fast neutrons and nitrogen nuclei present in the atmosphere.

ANSWER DOWNLOAD EXAMIANS APP

Physics
What is the principle of a ''Life Jacket"?

It decreases the volume of the person to keep him afloat
It provides oxygen to a drowning person
It increases the volume of the person to keep him afloat
The person can sit on it like a raft

ANSWER DOWNLOAD EXAMIANS APP