Physical World Units and Measurements - Result Question 18
18. The velocity of a particle at time is given by , where and are constant. The dimensions of and are respectively
[2006]
(a)
(c)
(b)
(d)
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Answer:
Correct Answer: 18. (d)
Solution:
- (d) Dimension of
dimension of velocity
a.t
Dimension of
(two physical quantity of same dimension can only be added)
So, dimension of
Dimension of
So, answer is
A dimensionally correct equation may or may not be physically correct. In a dimensionally correct equation, the dimensions of each term on both sides of an equation must be the same.