Physics
The work done by the string of a simple pendulum during one complete oscillation is equal to

Zero
Potential energy of the pendulum
Kinetic energy of the pendulum
Total energy of the pendulum

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Physics
Siphon will fail to work if:

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.
The densities of the liquid in the two vessels are equal.

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