Physics
While ascending a hill, the driver of the vehicle keeps the gear ratio

Equal to 1
Either equal to or greater than 1
Less than 1
Greater than 1

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Physics
Siphon will fail to work if:

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

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