General Conditions of Equilibrium MCQs – Part 1
3 questions. Tap an option to check it instantly, then read the solution.
Practice SSC JE and other civil engineering exam questions on the conditions of equilibrium: what equilibrium means, ΣH = 0, ΣV = 0 and ΣM = 0 for coplanar forces, and Newton's second law applied to accelerating bodies such as a lift on a rope. Tap an option to check it, then open the full explanation for each question.
Question 1Easy
A body is said to be in equilibrium if:
Answer: D. None of these
Equilibrium means the resultant force and the resultant moment are both zero — none of the listed motions defines it.
Question 2Easy
If ΣH and ΣV are the algebraic sums of the forces resolved horizontally and vertically, and ΣM is the algebraic sum of the moments of the forces about any point, then for equilibrium of the body:
Answer: D. All options are correct
All three must hold for a general coplanar force system: ΣH = 0, ΣV = 0 and ΣM = 0.
Question 3Medium
A lift of weight W is lifted by a rope with an acceleration f. If the cross-sectional area of the rope is A, the stress in the rope is:
Answer: A. W(1 + f/g)/A
T − W = (W/g)f, so T = W(1 + f/g) and stress = T/A = W(1 + f/g)/A.