Physics
A bucket of water is hung from a spring balance. A piece of iron is suspended in the water without touching the sides or touching the bottom of the bucket. The reading of the spring balance

Varies with the increase of depth of the immersion of the iron piece
Does not change
Will increase
Will decrease

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Physics
Circuit breaker usually operate under

Transient state of short-circuit current
Steady state of short-circuit current
After D. C. component has ceased
Sub-transient state of short-circuit current

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Physics
Siphon will fail to work if:

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.
Both its limbs are of unequal length.
The densities of the liquid in the two vessels are equal.

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