Strength of Materials MCQ pdf Download - Set 11 - ObjectiveBooks

Practice Test: Question Set - 11

1. A composite member shown in below figure was formed at 25°C and was made of two materials a and b. If the coefficient of thermal expansion of a is more than that of b and the composite member is heated up to 45°C, then
(A) a will be in tension and b in compression
(B) Both will be in compression
(C) Both will be in tension
(D) a will be in compression and b in tension

2. Coulomb friction is the friction between
(A) Bodies having relative motion
(B) Two dry surfaces
(C) Two lubricated surfaces
(D) Solids and liquids

3. The ratio of the moment of inertia of a circular plate and that of a square plate for equal depth, is
(A) Less than one
(B) Equal to one
(C) More than one
(D) Equal to 3π/16

4. The principal stresses at a point are 100, 100 and -200 kgf/cm2, the octahedral shear stress at the point is:
(A) 100 √2 kg/cm2
(B) 200 √2 kg/cm2
(C) 300 √2 kg/cm2
(D) 400 √2 kg/cm2

5. A sample of metal weighs 219 gms in air, 180 gms in water, 120 gms in an unknown fluid. Then which is correct statement about density of metal
(A) Density of metal can't be determined
(B) Metal is twice as dense as water
(C) Metal will float in water
(D) Metal is twice as dense as unknown fluid

6. The energy stored in a beam of length ‘L’ subjected to a constant B.M. is
(A) M2L/2EI
(B) ML2/2EI
(C) M2L/EI
(D) ML2/EI

7. In a simply supported beam L with a triangular load W varying from zero at one end to the maximum value at the other end, the maximum bending moment is
(A) WL/3
(B) WL/9 √3
(C) WL/4
(D) WL3/9 √3

8. Which is the correct statement about law of polygon of forces?
(A) If any number of forces acting at a point can be represented by the sides of a polygon taken in order, then the forces are in equilibrium
(B) If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are in equilibrium
(C) If a polygon representing forces acting at a point is closed then forces are in equilibrium
(D) If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium

9. If a member carries a tensile force P on its area of cross-section A, the normal stress introduced on an inclined plane making an angle θ with its transverse plane, is
(A) (P/A) sin2θ
(B) (P/A) cos2θ
(C) (P/A) tan2θ
(D) (P/2A) sin2θ

10. Failure of riveted joints is due to
(A) Tearing of the plates between the rivet hole and the edge of the plate
(B) Tearing of plates between rivets
(C) Shearing of rivets
(D) All the above

11. Two non-collinear parallel equal forces acting in opposite direction
(A) Balance each other
(B) Constitute a moment
(C) Constitute a couple
(D) Constitute a moment of couple

12. A simply supported wooden beam 150 cm long and having a cross section 16 cm × 24 cm carries a concentrated load, at the centre. If the permissible stress ft = 75 kg/cm2 and fs= 10 kg/cm2 the safe load is
(A) 3025 kg
(B) 3050 kg
(C) 3075 kg
(D) 3100 kg

13. If a steel rod of 20 mm diameter and 5 metres long elongates by 2.275 mm when subjected to an axial pull of 3000 kg, the stress developed, is
(A) 9.5541 kg/cm2
(B) 95.541 kg/cm2
(C) 955.41 kg/cm2
(D) 9554.1 kg/cm2

14. Least force required to draw a body up the inclined plane is W sin (plane inclination + friction angle) applied in the direction
(A) Along the plane
(B) Horizontally
(C) Vertically
(D) At an angle equal to the angle of friction to the inclined plane

15. If a constant section beam is subjected to a uniform bending moment throughout, its length bends to
(A) A circular arc
(B) A parabolic arc
(C) A catenary
(D) None of these

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