Physics
Optical Fibre technology works on which of these principles of Physics?

Photoelectric effect
Newton's law of Motion
Bernoulli's Principle
Total internal reflection of Light

ANSWER DOWNLOAD EXAMIANS APP

Physics
Lightning is produced when

Water vapour produces electricity in the clouds
Similar charges of electricity rush towards each other and then get repelled
Strong opposite charges in different clouds break down the resistance offered by the intervening air
Clouds strike against impurities in air and the friction burns up these impurities

ANSWER DOWNLOAD EXAMIANS APP