2471. The necessary condition for forces to be in equilibrium is that these should be_______________?
A. coplanar
B. meet at one point ;
C. both A. and B. above
D. all be equal
✅ The correct answer is option C.
Civil Engineering
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2472. According to Lami’s theorem________________?
A. three forces acting at a point will be in equilibrium
B. three forces acting at a point can be represented by a triangle, each side being proportional to force
C. if three forces acting upon a particle are represented in magnitude and
direction by the sides of a triangle, taken in order, they will be in equilibrium
✅ The correct answer is option D.
2473. In column analogy method, the area of an analogous column for a fixed beam of span L and flexural rigidity El is taken as__________________?
A. L/EI
B. L/2EI
C. L/3EI
D. L/4EI
✅ The correct answer is option A.
2474. Dynamic friction as compared to static friction is________________?
A. same
B. more
C. less
D. may be less of more depending on nature of surfaces and velocity
✅ The correct answer is option C.
2475. The C.G. of a right circular solid cone of height h lies at the following distance from the base_____________?
A. h/2
B. J/3
C. h/6
D. h/4
✅ The correct answer is option D.
2476. A semi-circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi-cricular disc and horizontal surface is i. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will____________________?
A. remain horizontal
B. slant up towards direction of pull
C. slant down towards direction of pull
D. unpredictable
✅ The correct answer is option C.
2477. On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be__________________?
A. downwards at its upper end
B. upwards at its upper end
C. perpendicular to the wall at its upper end
D. zero at its upper end
✅ The correct answer is option D.
2478. Pick up the incorrect statement from the following _______________?
A. The C.G. of a circle is at its center
B. The C.G. of a triangle is at the intersection of its medians
C. The C.G. of a rectangle is at the inter-section of its diagonals
D. The C.G. of a semicircle is at a distance of r/2 from the center
✅ The correct answer is option D.
2479. The coefficient of friction depends on_________________?
A. area of contact
B. shape of surfaces
C. strength of surfaces
D. nature of surface
✅ The correct answer is option D.
2480. In the equation of virtual work, following force is neglected_______________?
A. reaction of any smooth surface with which the body is in contact
B. reaction of a rough surface of a body which rolls on it without slipping
C. reaction at a point or an axis, fixed in space, around which a body is con-strained to turn
D. all of the above
✅ The correct answer is option D.