MLT are are the dimersions of
Correct answer: D. All of these
- A. strain
- B. refractive index
- C. magnification
- D. All of these
Explanation
The given dimensions indicate a dimensional quantity. Strain = change in length/original length [L]/[L] =1 so it is dimensionless Refractive index = velocity of light in medium 1/ velocity of light in medium 2 [LT-1]/[LT-1]=1 so it is dimensionless Magnification=Image length/ Object length [L]/[L] = 1 so it is dimensionless As all these quantities have no dimensions, option D is correct.
This question appeared on the ETEA MDCAT 2011 paper, which you can sit online with every answer explained.
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About Dimensional Analysis
Dimensional analysis expresses physical quantities through fundamental dimensions such as mass, length and time. It checks dimensional consistency, helps derive relations and converts between unit systems, but cannot determine numerical constants or distinguish quantities with identical dimensions. Dimensional formulae must not be confused with complete physical units.
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