🚧 Civil Engineering Solved MCQs with Answers

Practice 1228 approved 🚧 Civil Engineering questions with verified answers from the 🛠️ Engineering Essentials subject for Pakistan exams.

1228 solved MCQs

If g1 and g2 are the gravitational accelerations on two mountains A and B respectively, the weight of a body when transported from A to B will be multiplied byAnswer: g₂/g₁ If three rigid rods are hinged together to form a triangle and are given rotary as well as translatory motion, the number of instantaneous centres of the triangle, will beAnswer: 3 The mechanical advantage of an ideal machine is 100. For moving the local through 2 m, the effort moves throughAnswer: 0.02 m When a body in equilibrium undergoes an infinitely small displacement, work imagined to be done, is known asAnswer: virtual work The resultant of two forces P and Q acting at an angle θ, isAnswer: √P² + Q² + 2PQ cos θ To attain the synchronous orbit, the launch of a satellite, is done from a placeAnswer: on equator Pick up the correct statement from the following :Answer: All of the above If the radius of the earth is 600 km the height of a mountain above sea level at the top of which a beat seconds pendulum at sea level, looses 27 seconds a day, isAnswer: 2000 metres The total time of collision and restitution of two bodies, is calledAnswer: all of the above The length of a Second's pendulum, isAnswer: 99.4 cm A load of 500 kg was lifted through a distance of 13 cm. by an effort of 25 kg which moved through a distance of 650 cm. The efficiency of the lifting machine isAnswer: 40% A string of length 90 cm is fastened to two points A and B at the same level 60 cm apart. A ring weighing 120 g is slided on the string. A horizontal force P is applied to the ring such that it is in equilibrium vertically below B. The value of P is :Answer: 80 g The c.g. of a thin hollow cone of height h, above its base lies on the axis, at a height ofAnswer: 2h/3 Two forces act an angle of 120°. If the greater force is 50 kg and their resultant is perpendicular to the smaller force, the smaller force isAnswer: 25 kg The C.G. of a right circular cone lies on its axis of symmetry at a height ofAnswer: h/4 A uniform rod 9 m long weighing 40 kg is pivoted at a point 2 m from one end where a weight of 120 kg is suspended. The required force acting at the end in a direction perpendicular to rod to keep it equilibrium, at an inclination 60° with horizontal, isAnswer: 10 kg If a particle is projected inside a horizontal tunnel which is 554 cm high with a velocity of 60 m per sec, the angle of projection for maximum range, isAnswer: 10° A rectangular bar of width b and height h is being used as a cantilever. The loading is in a plane parallel to the side b. The section modulus isAnswer: bh²/6 As compared to uniaxial tension or compression, the strain energy stored in bending is onlyAnswer: 1/3 The ratio of strengths of solid to hollow shafts, both having outside diameter D and hollow having inside diameter D/2, in torsion, isAnswer: 15/16 The weakest section of a diamond riveting, is the section which passes throughAnswer: first row In a loaded beam, the point of con-traflexture occurs at a section whereAnswer: bending moment is zero or changes sign The ratio of elongations of a conical bar due to its own weight and that of a prismatic bar of the same length, isAnswer: 1/3 A three-hinged arch is said to be :Answer: statically determinate structure The deflection due to couple M at the free end of a cantilever length L isAnswer: ML²/2EI The shape of the bending moment diagram over the length of a beam, having no external load, is alwaysAnswer: linear Pick up the incorrect statementAnswer: Welding takes more time than riveting A uniform girder simply supported at its ends is subjected to a uniformly distributed load over its entire length and is propped at the centre so as to neutralise the deflection. The net B.M. at the centre will beAnswer: WL/32 A beam of length L is pinned at both ends and is subjected to a concentrated bending couple of moment M at its centre. The maximum bending moment in the beam isAnswer: M If two forces acting at a joint are not along the straight line, then for the equilibrium of the jointAnswer: each force must be zero