# Practice Test: Question Set - 09

**1. In the truss shown in given figure, the force in member**

*BD*is- (A) 100

*t*compressive

- (B) 100

*t*tensile

- (C) Zero

- (D) Indeterminate

**2. The moment of inertia of a circular section about any diameter**

*D*, is- (A)

*πD*

^{2}/64

- (B)

*πD*

^{4}/32

- (C)

*πD*

^{3}/64

- (D)

*πD*

^{4}/64

**3. The S.F. diagram of a loaded beam shown in the given figure is that of**

- (A) A simply
supported beam with isolated central load

- (B) A simply
supported beam with uniformly distributed load

- (C) A cantilever
with an isolated load at the free end

- (D) A cantilever
with a uniformly distributed load

**4. If**

*M, I, R, E, F,*and*Y*are the bending moment, moment of inertia, radius of curvature, modulus of elasticity stress and the depth of the neutral axis at section, then- (A)

*M*/

*I = R*/

*E = F*/

*Y*

- (B)

*I*/

*M*=

*R*/

*E*=

*F*/

*Y*

- (C) M/I =

*E*/

*R*=

*F*/

*Y*

- (D)

*M*/

*I*=

*E*/

*R*=

*Y*/

*F*

**5. Shear strain energy theory for the failure of a material at elastic limit, is due to**

- (A) Rankine

- (B) Guest or
Trecas

- (C) St. Venant

- (D) Von Mises

**6. If the normal stresses due to longitudinal and transverse loads on a bar are σ**

_{1}and σ_{2 }respectively, the tangential component of the stress on an inclined plane through θ°, the longitudinal load is- (A) σ

_{1}sinθ + σ

_{2}cosθ

- (B) σ

_{1}sin²θ + σ

_{2}cos

^{2}θ

- (C) (σ

_{1}- σ

_{2}) sin 2θ/2

- (D) (σ

_{1}+ σ

_{2}) sin 2θ/2

**7. The radius of gyration of a section of area**

*A*and least moment of inertia*I*about the centroidal axis, is- (A)

*A*/

*I*

- (B)

*I*/

*A*

- (C) √(

*I*/

*A*)

- (D) √(

*A*/

*I*)

**8. The locus of the moment of inertia about inclined axes to the principal axis, is**

- (A) Straight
line

- (B) Parabola

- (C) Circle

- (D) Ellipse

**9. Beams composed of more than one material, rigidly connected together so as to behave as one piece, are known as**

- (A) Compound
beams

- (B) Indeterminate
beams

- (C) Determinate
beams

- (D) Composite
beams

**10. A steel plate**

*d*×*b*is sandwiched rigidly between two timber joists each*D*×*B*/2 in section. The moment of resistance of the beam for the same maximum permissible stress ‘σ’ in timber and steel will be (where Young's modulus of steel is*m*times that of the timber).- (A) σ [(

*BD*

^{2}+

*mbd*

^{2})/6

*D*]

- (B) σ [(

*BD*

^{3}+

*mbd*

^{3})/6

*D*]

- (C) σ [(

*BD*

^{2}+

*mbd*

^{3})/4

*D*]

- (D) σ [(

*BD*

^{2}+

*mbd*

^{2})/4

*D*]

**11. The general expression for the B.M. of a beam of length**

*l*is the beam carries*M*= (*wl*/2)*x*- (*wx*^{2}/2)- (A) A uniformly
distributed load

*w*/unit length

- (B) A
load varying linearly from zero at one end to

*w*at the other end

- (C) An isolated
load at mid span

- (D) None of
these

**12. In a shaft, the shear stress is not directly proportional to**

- (A) Radius of
the shaft

- (B) Angle of
twist

- (C) Length of
the shaft

- (D) Modulus of
rigidity

**13. In the truss, the force in the member**

*AC*is- (A) 6.25

*t*compressive

- (B) 8.75

*t*tensile

- (C) (8.75/√3)

*t*tensile

- (D) (8.75/√3)

*t*compressive

**14. The maximum deflection of a simply supported beam of span**

*L*, carrying an isolated load at the centre of the span; flexural rigidity being*EI*, is- (A)

*WL*

^{3}/3

*EL*

- (B)

*WL*

^{3}/8

*EL*

- (C)

*WL*

^{3}/24

*EL*

- (D)

*WL*

^{3}/48

*EL*

**15. The point of contraflexure is the point where**

- (A) B.M. changes
sign

- (B) B.M. is
maximum

- (C) B.M. is
minimum

- (D) S.F. is zero

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