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Q: Select the correct statement regarding the 1st and 2nd moment of area of circular lamina with radius 'R'.
  • A. 1st moment of area is always +ve and 2nd moment of area is always -ve.
  • B. 1st moment of area and 2nd moment of area are always +ve.
  • C. 1st moment of area is may be either -ve or +ve based on the chosen reference axes, but 2nd moment of area is always +ve.
  • D. 1st moment of area is always -ve and 2nd moment of area is always +ve.
Correct Answer: Option C - 1st and 2nd moment of area of a circular lamina with radius 'R' is indicating 1st moment of area is may be either –ve or +ve based on the reference axis but 2nd moment of area is always +ve.
C. 1st and 2nd moment of area of a circular lamina with radius 'R' is indicating 1st moment of area is may be either –ve or +ve based on the reference axis but 2nd moment of area is always +ve.

Explanations:

1st and 2nd moment of area of a circular lamina with radius 'R' is indicating 1st moment of area is may be either –ve or +ve based on the reference axis but 2nd moment of area is always +ve.