Physics
A parallel-plate capacitor of capacitance C1 is made using two gold plates. Another parallel-plate capacitor of capacitance C2 is made using two aluminium plates with same plate separation, and all the four plates are of same area. If rg and ra are respectively the electrical resistivities of gold and aluminium, then which one of the following relations is correct?

C1>C2
C1pa = C2pg
C2>C1
C1 = C2

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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 densities of the liquid in the two vessels are equal.
The level of the liquid in the two vessels are at the same height.

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