Online Civil Engineering Test - Strength of Materials Test

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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Pick up the incorrect statement

The cross-sectional area of the welded member is effective

A welded joint develops strength of its parent metal

Welded joints provide rigidity

Welded joints have better finish

Welding takes more time than riveting.

[#]

If a rectangular beam measuring 10 x 18 x 400 cm carries a unformly distributed load such that the bending stress developed is 100 kg/cm². The intensity of the load per metre length, is

240 kg

250 kg

260 kg

270 kg

280 kg.

[#]

For a simply supported beam of length L, the bending moment M is described as M = a (x - x³/L²), 0 ≤ x < L; where a is a constant. The shear force will be zero at

the supports

x = L/2

x = L/3

[#]

In a tension test, the yield stress is 300 kg/cm², in the octa hedral shear stress at the point is:

100 2 kg/cm²

150 2 kg/cm²

200 2 kg/cm

250 2 kg/cm².

[#]

In a three hinged arch, the third hinge is generally kept at

crown of the arch

midpoint of the crown and left support hinge

midpoint of the crown and right support hinge

none of these.

[#]

For structural analysis of forces, the method refers to

moment-area-theorem

three-moment equation

Maxwell's reciprocal theorem

none of these.

[#]

If a member is subjected to a tensile force P, having its normal cross-section A, the resulting shear stress in an oblique plane inclined at an angle θ to its transverse plane, is

[#]

The moment diagram for a cantilever carrying a concentrated load at its free end, will be

triangle

rectangle

parabola

cubic parabola.

[#]

A joint of a frame is subjected to three tensile force P, Q and R equally inclined to each other. If P is 10 tonnes, the other forces will be

Q = 10 tonnes and R = zero

R + 10 tonnes and Q = zero

Q + R = 10 tonnes

Q - R = zero

Q and R each is equal to 10 tonnes.

[#]

10.

The maximum stress intensity due to a suddenly applied load is x-times the stress intensity produced by the load of the same magnitude applied gradually. The value of x is

[#]

11.

In a square beam loaded longitudinally, shear develops

on middle fibre along horizontal plane

on lower fibre along horizontal plane

on top fibre along vertical plane

equally on each fibre along horizontal plane

none of these.

[#]

12.

For the beam shown in below figure, the maximum positive bending moment is nearly equal to negative bending moment when L₁ is equal to

1.0 L

0.7 L

0.5 L

0.35 L.

[#]

13.

If the stress produced by a prismatic bar is equal to the working stress, the area of the cross-section of the prismatic bar, becomes

zero

infinite

maximum

minimum.

[#]

14.

In a continuous bending moment curve the point where it changes sign, is called

point of inflexion

point of contraflexture

point of virtual hinge

all the above.

[#]

15.

The maximum compressive stress at the top of a beam is 1600 kg/cm² and the corresponding tensile stress at its bottom is 400 kg/cm² . If the depth of the beam is 10 cm, the neutral axis from the top, is

2 cm

4 cm

6 cm

8 cm

10 cm.

[#]

16.

The following assumption is not true in the theory of pure torsion :

The twist along the shaft is uniform

The shaft is of uniform circular section throughout

Cross-section of the shaft, which is plane before twist remains plane after twist

All radii get twisted due to torsion.

[#]

17.

If the length of a cantilever carrying an isolated load at its free end is doubled, the deflection of the free end will increase by

1/8

1/3

[#]

18.

The effect of arching a beam, is

to reduce the bending moment throughout

to increase the bending moment throughout

nothing on the bending throughout

ail the above.

[#]

19.

If p is the internal pressure in a thin cylinder of diameter d and thickness t, the developed hoop stress, is

[#]

20.

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

h/4

h/3

h/2

2/3 h.

[#]

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Online Civil Engineering Test - Strength of Materials Test

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