UPSC Civil Service Exam Questions - Engineering

Q1:

A square framework formed of uniform heavy rods of equal weight joined together is hung by one corner. A weight W is suspended from each of the three lower corners and the shape of the square is preserved .with the help of a light rod along the horizontal diagonal. The thrust of the light rod is

AW

BW

CW

DW

ANS:C - 4 W

Describe the answer in detail.