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UPSC Civil Service Exam Questions

Q1:

The plastic section modulus of a rectangular section of width 100 mm and depth 12 mm is

A 1000 mm3

B 1800 mm3

C 2400 mm3

D 3600 mm3

ANS:D - 3600 mm3

(Zp=Ac x yc+At x yt).
Ac = area of compression zone.
At = area of tension zone.
Yc &yt are the C.G of the both zones.

So the answer is zp = 600x300+600x300.
=3600.



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