Civil Engineering Strength of Materials Objective Questions - Set 09 - ObjectiveBooks
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# Practice Test: Question Set - 09

1. A closely coiled helical spring of radius R, contains n turns and is subjected to an axial load W. If the radius of the coil wire is r and modulus of rigidity of the coil material is C, the deflection of the coil is
(A) WR3n/Cr4
(B) 2WR3n/Cr4
(C) 3WR3n/Cr4
(D) 4WR3n/Cr4

2. In the lever of third order, load W, effort P and fulcrum F are oriented as follows
(A) W between P and F
(B) F between W and P
(C) P between W and F
(D) W, P and F all on one side

3. In the cantilever truss as shown in below figure, the horizontal component of the reaction at A, is
(A) 30 tonnes
(B) 60 tonnes
(C) 90 tonnes
(D) 120 tonnes

4. The property by which a body returns to its original shape after removal of the force, is called
(A) Plasticity
(B) Elasticity
(C) Ductility
(D) Malleability

5. Forces are called coplanar when all of them acting on body lie in
(A) One point
(B) One plane
(C) Different planes
(D) Perpendicular planes

6. The slenderness ratio of a vertical column of a square cross-section of 2.5 cm sides and 300 cm length, is
(A) 200
(B) 240
(C) 360
(D) 416

7. The stress necessary to initiate yielding, is considerably
(A) More than that necessary to continue it
(B) Less than that necessary to continue it
(C) More than that necessary to stop it
(D) Less than that necessary to stop it

8. Which of the following is not a scalar quantity?
(A) Time
(B) Mass
(C) Volume
(D) Acceleration

9. Influence lines are drawn for structures
(A) Of any type
(B) Statically determinate
(C) Pin-jointed truss
(D) None of these

10. A cast iron T section beam is subjected to pure bending. For maximum compressive stress to be three times the maximum tensile stress, centre of gravity of the section from flange side is
(A) h/4
(B) h/3
(C) h/2
(D) 2/3 h

11. The units of moment of inertia of an area are
(A) kg m2
(B) m4
(C) kg/m2
(D) m3

12. The radius of gyration of a rectangular section is not proportional to
(A) Square root of the moment of inertia
(B) Square root of the inverse of the area
(C) Square root of the moment of inertia divided by area of the section
(D) None of these

13. Ties are load carrying members of a frame, which are subjected to

14. 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

15. The phenomenon of slow extension of materials having constant load, i.e. increasing with the time is called
(A) Creeping
(B) Yielding
(C) Breaking
(D) None of these

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