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Question

Which of the following quantities are vectors.


A
All of them
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B
1, 2, 5 and 6
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C
3, 4
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D
None of them
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Solution

The correct option is C 3, 4

A vector has both magnitude and direction.

  1. 70 cm3 – Volume – No direction, only magnitude
  2. 5 m/s – speed – Direction not specified
  3. 8 m/s NE – Speed 8 m/s + Direction which is North East. So a vector quantity.
  4. 70 cm to the right - Magnitude = 70 cm Direction – To the right Hence a vector quantity
  5. 25C – Temperature – Only magnitude no direction
  6. 30 N (force) – The direction in which the force is applied has not been specified So it’s not a vector.

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