MCQ's On Theory of Structures - Set 08 - ObjectiveBooks

# Practice Test: Question Set - 08

1. The force in AD of the truss shown in given figure, is
(A) 4.0 t compression
(B) 3.0 t compression
(C) 0.5 t compression
(D) 0.5 t tension

2. The equivalent length of a column of length L, having one end fixed and other end hinged, is
(A) 2L
(B) L
(C) L/2
(D) L/√2

3. By applying the static equations i.e. ΣH = 0, ΣV = 0 and ΣM = 0, to a determinate structure, we may determine
(A) Supporting reactions only
(B) Shear forces only
(C) Bending moments only
(D) All the above

4. A lift of weight W is lifted by a rope with an acceleration f. If the area of cross-section of the rope is A, the stress in the rope is
(A) [W (1 + f/G)]/A
(B) (1 - g/f)/A
(C) [W (2 + f/G)]/A
(D) [W (2 + g/f)]/A

5. Co-efficient of wind resistance of a circular surface, is
(A) 1/2
(B) 1/3
(C) 2/3
(D) 3/2

6. The equation of a parabolic arch of span ‘l’ and rise ‘h’, is given by
(A) y = h/l2 × (1 - x)
(B) y = 2h/l2 × (1 - x)
(C) y = 3h/l2 × (1 - x)
(D) y = 4h/l2 × (1 - x)

7. A rectangular column shown in the given figure carries a load P having eccentricities ex and ey along X and Y axes. The stress at any point (x, y) is
(A) (p/bd) [1 + (12ey. y/d2) + (12ex. x/d2)]
(B) p [1 + (6ey. y/b) + (6ex. x/b)]
(C) (p/bd) [1 + (6ey. y/d) + (6ex. x/b)]
(D) (p/bd) [1 + (ey. y/d) + (ex. x/d)]

8. In case of principal axes of a section
(A) Sum of moment of inertia is zero
(B) Difference of moment inertia is zero
(C) Product of moment of inertia is zero
(D) None of these

9. A simply supported beam carries a varying load from zero at one end and w at the other end. If the length of the beam is a, the shear force will be zero at a distance x from least loaded point where x is
(A) a/2
(B) a/3
(C) a/√3
(D) a √3/2

10. The locus of the end point of the resultant of the normal and tangential components of the stress on an inclined plane, is
(A) Circle
(B) Parabola
(C) Ellipse
(D) Straight line

11. The shape factor of standard rolled beam section varies from
(A) 1.10 to 1.20
(B) 1.20 to 1.30
(C) 1.30 to 1.40
(D) 1.40 to 1.50

12. In the cable shown in the given figure, the minimum tension occurs at
(A) A
(B) B
(C) C
(D) Between A and C

13. Principal planes are subjected to
(A) Normal stresses only
(B) Tangential stresses only
(C) Normal stresses as well as tangential stresses
(D) None of these

14. Ab and Ac are the cross sections of bronze and copper bars of equal length, σb, σc are their respective stresses due to load P. If Pb and Pc are the loads shared by them, (where Eb and Ec are their modulii).
(A) σbc = Eb /Ec
(B) P = Pb + Pc
(C) P = Ab σb + Ac σb
(D) All the above

15. A rolled steel joist is simply supported at its ends and carries a uniformly distributed load which causes a maximum deflection of 10 mm and slope at the ends of 0.002 radian. The length of the joist will be,
(A) 10 m
(B) 12 m
(C) 14 m
(D) 16 m

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