Class XII

Vectors A and B are Collinear
  1. if they are parallel to the same line irrespective of their magnitudes and directions.
  2. if the direction cosines of one are negatives of the other
  3. if they are have equal magnitude
  4. if they are in the same line
Which of the following is a vector?
  1. energy
  2. mass
  3. charge
  4. acceleration
Vector has
  1. magnitude
  2. magnitude as well as direction
  3. direction
  4. None of these
Direction cosines
  1. are cosines of Direction angles
  2. are cotangents of Direction angles
  3. are tangents of Direction angles
  4. are sines of Direction angles
Unit Vector is
  1. A vector whose direction angle α is unity
  2. A vector whose direction angle γ is unity
  3. A vector whose direction angle β is unity
  4. A vector whose magnitude is unity
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