Engineering Mechanics
Non-coplanar non-concurrent forces are those forces which

Do not meet at one point but their lines of action lie on the same plane
Meet at one point, but their lines of action do not lie on the same plane
None of these
Do not meet at one point and their lines of action do not lie on the same plane

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Engineering Mechanics
According to Newton's first law of motion,

None of these
The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction, in which the force acts
Everybody continues in its state of rest or of uniform motion, in a straight line, unless it is acted upon by some external force
To every action, there is always an equal and opposite reaction

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