Physics
Why does the sea appear blue in colour?

Scattering of the sunlight by water molecules
Refraction of the sun light
Reflection of the sun light from water surface
Interference of the sun light from water surface

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Physics
In a bipolar junction transistor

All the three regions (the emitter, the base and the collector) have equal concentrations of impurity
The collector has the least concentration of impurity
The base has the least concentration of impurity
The emitter has the least concentration of impurity

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Physics
Superconductors are substances which

conduct electricity at low temperature
offer no resistance to the flow of electricity
conduct electricity at high temperatures
offer high resistance to the flow of current

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