Strength of Materials

Question 1

The property of materials that enable it to absorb energy before rupturing, represented by the area under stress-strain curve derived from a tensile test of the material.

a. ductility
b. brittleness
c. rigidity
d. toughness

Answer 1

d. toughness

Question 2

The property of a material to resist a change in its physical shape.

a. ductility
b. brittleness
c. rigidity
d. toughness

Answer 2

c. rigidity

Question 3

The property of a material to fracture at low stress without appreciable deformation.

a. ductility
b. brittleness
c. rigidity
d. toughness

Answer 3

b. brittleness

Question 4

The property of a material to undergo plastic deformation under being stressed beyond the elastic limit before rupturing.

a. ductility
b. brittleness
c. rigidity
d. toughness

Answer 4

a. ductility

Question 5

A force that acts perpendicular to the cross section of a structural member and at its centroid.

a. axial load
b. eccentric load
c. moment load
d. direct load

Answer 5

a. axial load

Question 6

The twisting of a structural member about its longitudinal axis by two equal and opposite torques.

a. moment
b. elongation
c. torsion
d. couple

Answer 6

c. torsion

Question 7

A type of beam with fixed support and a roller support at the other end.

a. simple beam
b. restrained beam
c. cantilever beam
d. propped beam

Answer 7

d. propped beam

Question 8

The stress beyond which the ratio of stress and strain for a material no longer remains constant.

a. Proportional Limit
b. Yield Strength
c. Ultimate Strength
d. Rupture Strength

Answer 8

a. Proportional Limit

Question 9

The change in length caused usually by a force applied to a piece, the change being expressed as a ratio, the increase or decrease divided by the original length.

a. stress
b. force
c. strain
d. moment

Answer 9

c. strain

Question 10

The ratio of the transverse strain to longitudinal strain. 
a, Stress Ratio 
b. Hooke's Ratio 
c. Poisson's Ratio 
d. Strain Ratio

Answer 10

c. Poisson’s Ratio

Question 11

The modulus of elasticity of Steel is

a. 100 GPa
b. 200 GPa
c. 200 MPa
d. 100 MPa

Answer 11

b. 200 GPa

Question 12

This represents the ability of the material to absorb energy without any permanent damage to the material.

a. Modulus of Toughness
b. Modulus of Elasticity
c. Modulus of Resilience
d. Modulus of Rigidity

Answer 12

c. Modulus of Resilience

Question 13

What class of black or dark-coloured cementitious substances is composed principally of high-molecular weight hydrocarbons?

a. Gypsum
b. Pozzolans
c. Bitumen
d. Lime

Answer 13

c. Bitumen

Question 14

Give the flexibility of truss member with length L, cross sectional area A, modulus of elasticity E and moment of Inertia I. Express your answer in terms of L, A and E.

a. AE/L
b. EL/A
c. E/AL
d. L/AE

Answer 14

d. L/AE

Question 15

What term refers to roof beams spanning between trusses?

a. Girt
b. Purlin
c. Sagrods
d. Lintel Beam

Answer 15

b. Purlin

Question 16

This element is added to the steel to make the steel corrosion resistant, when this element is more than 16%, the material is called stainless steel.

a. aluminum
b. zinc
c. brass
d. chromium

Answer 16

d. chromium

Question 17

A heat treatment of steel which is done through shock cooling by immersing it to liquid or molten material into a cooling medium (liquid or gas)

a. annealing
b. over-heating
c. quenching
d. abrupt cooling

Answer 17

c. quenching

Question 18

It is the largest stress based on the original cross-sectional area which a material can stand. Thus, it is the maximum ordinate of the stress-strain curve.

a. Proportional Limit
b. Yield Strength
c. Ultimate Strength
d. Rupture Strength

Answer 18

c. Ultimate Strength

Question 19

When a beam is loaded, the new position of its longitudinal centroid axis is called

a. deflected shape
b. elastic curve
c. parabolic curve
d. inelastic curve

Answer 19

b. elastic curve

Question 20

The point in the moment diagram at which the curvature reverses as it changes from concave to convex is called

a. Point of deflection
b. moment of inertia
c. point of inflection
d. zero shear

Answer 20

c. point of inflection