Physics
A copper wire of radius r and length l has a resistance of R. A second copper wire with radius 2r and length l is taken and the two wires are joined in a parallel combination. The resultant resistance of the parallel combination of the two wires will be

5 R
5 R/4
R/5
4 R/5

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Physics
The velocity of sound in air

Increases with decrease of temperature
Decreases with decrease of temperature
Does not depend on temperature
Decreases with increase of temperature

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