Physics
What is the direction of torque?

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

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Physics
In a railway track, two rails are joined end to end with a gap in between them because

Accidents due to contraction in winter can be avoided
Steel can be saved
Accidents due to expansion in summer can be avoided
Air-gaps are necessary for bearing the weight of running train

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