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UPSC Civil Service Exam Questions - Engineering

Q1:

In the force system shown in the figure, the force CA should be

A 5 t

B - 5 t

C 4 t

D - 4 t

ANS:A - 5 t

3^2+4^2 = SQUARE OF ANSWER.
25 = SQUARE OF ANSWER.

TAKING SQUARE ROOT ON BOTH SIDE SO,
5 = ANSWER.