Physics
Why does a cannon recoil after firing ?

Backward thrust of gases produced
Newton's first law of motion
Newton's third law of motion
Conservation of energy

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Physics
In a bipolar junction transistor

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

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Physics
Why does the sea appear blue in colour?

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

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