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 |
 52%
From NCERT
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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 |
 61%
From NCERT
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