NEET Physics SI Units MCQ Question
Which of the following combinations about SI units and dimensional analysis is correct?
The unit for solid angle is steradian and has dimensions of area over the square of the radius.
The unit for plane angle is radian and it is dimensionless.
A dimensionally correct equation indicates the relationship between physical quantities, but does not guarantee its accuracy.
The SI unit of mass is kilogram, and it is defined in terms of the force exerted by gravity on an object.
Correct Answer
Detailed Explanation
Option A is incorrect as steradian is not expressed as area over radius squared; option B is misleading since the radian is a derived unit, not dimensionless; option D misrepresents the definition of the kilogram, which is based on physical constants, not gravity. Thus, only option C accurately reflects the principles of dimensional analysis.
Found an issue with this question?