Physics
When two semiconductors of pand n-type are brought in contact, they form p-n junction which acts like a/an

Conductor
Amplifier
Oscillator
Rectifier

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Physics
Siphon will fail to work if:

The densities of the liquid in the two vessels are equal.
Both its limbs are of unequal length.
The temperature of the liquids in the two vessels are the same.
The level of the liquid in the two vessels are at the same height.

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