Physical World Units and Measurements - Result Question 25
27. Which of the following is a dimensional constant?
(a) Refractive index
[1995]
(b) Poissons ratio
(c) Relative density
(d) Gravitational constant
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Answer:
Correct Answer: 27. (d)
Solution:
- (d) A quantity which has dimensions and a constant value is called dimensional constant. Therefore, gravitational constant (G) is a dimensional constant. Value of
Relative density, refractive index and poisson ratio all the three are ratios, therefore they are dimensionless constants.
Angle is an exceptional physical quantity, which though is a ratio of two similar physical quantities
