Physics
Optical fibre works on which of the following principle of light?

Diffraction
Reflection
Total internal reflection
Refraction

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Physics
Why does bleeding occur through the nose in high mountainous regions ?

The blood pressure fluctuates and finally decreases drastically
The pressure of blood in capillaries is greater than the outside pressure
The pressure at high altitudes is greater than that on the plains
The blood pressure of a person increases at high altitudes

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Physics
Super conductors are substances that

Conduct electricity at low temperature
Offer minimum resistance to flow of electric current
Conduct electricity at high temperature
Offer high resistance to the flow of electric current

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