# 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)

*WR*

^{3}

*n*/

*Cr*

^{4}

- (B) 2

*WR*

^{3}

*n*/

*Cr*

^{4}

- (C) 3

*WR*

^{3}

*n*/

*Cr*

^{4}

- (D) 4

*WR*

^{3}

*n*/

*Cr*

^{4}

**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 m

^{2}

- (B) m

^{4}

- (C) kg/m

^{2}

- (D) m

^{3}

**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**

- (A) Transverse loads

- (B) Axial
tension loads

- (C) Axial
compressive loads

- (D) Torsional
loads

**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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