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/4
5 R
R/5
4 R/5

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Physics
What is the direction of torque?

Parallel to the radius
Opposite to the direction of applied force
Same as the direction of applied force
Perpendicular to the direction of applied force

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Physics
Conservation of energy refers to the fact that

If you conserve energy you will not be as tired
Energy cannot be created or destroyed but can be converted from one form to another
No chemical reaction is 100 percent efficient
The entropy of the universe is always increasing

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