Q.

Choose the correct statement(s).

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a

A dimensionally correct equation must be correct.

b

A dimensionally correct equation may be correct.

c

A dimensionally incorrect equation must be incorrect.

d

A dimensionally incorrect equation may be correct.

answer is B.

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Detailed Solution

A dimensionally correct equation may or may not be correct. For example , for a particle moving with constant acceleration along a straight line ,, s=ut+at2 is dimensionally correct, but not correct actually. Again for a particle moving along a straight line with constant acceleration , displacement in nth second is given by sn = u + 12a2n-1 , which is dimensionally incorrect .
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Choose the correct statement(s).