Applied Mechanics and Graphic Statics
Pick up the incorrect statement from the following. In case of suspension bridge due to rise in temperature,

Dip of the cable increases
Length of the cable increases
Dip of the cable decreases
None of these

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Applied Mechanics and Graphic Statics
If a set of given forces are such that their free vectors build a closed polygon, then

The resultant force is zero but resultant couple may not be zero
The resultant force and resultant couple are always zero
The resultant force is zero but resultant couple is not zero
The resultant force and resultant couple both may not be zero

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