Given a+b+c+d=0, which one of the following is incorrect?

1. a, b, c and d must be null vectors.

2. The magnitude of a+c equals the magnitude of b+d.

3. The magnitude of a can never be greater than the sum of the magnitudes of b, c and d

4. b+c must lie in the plane of a and d if a and d are not collinear, and along the direction of a and d if they are collinear.

Subtopic:  Resultant of Vectors |
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A scalar quantity is one that:

1. is conserved in a process.

2. will never accept negative values.

3. must be dimensionless.

4. has the same value for observers with different orientations of axes.

Subtopic:  Scalars & Vectors |
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