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WorksheetsStrength of materials Test 1
Total questions: 27
Worksheet time: 14mins
A cylindrical rod of cross-sectional area A experienced pressure p due to a compressive force F. If the force applied is reduced to one-third what happens to pressure?
also reduced to one-third
tripled
remains the same
What relationship exists between applied force and strain?
direct
indirect
none at all
This refers to the ratio of tensile stress to tensile strain.
Bulk Modulus of elasticity
Shear Modulus of Rigidity
Young's Modulus of elasticity
Given the Young's modulus of elasticity below rank the metals according to the magnitude of tensile stress it can hold from highest to lowest.
Aluminum 69 GPa
Brass 125 GPa
Steel 200 GPa
Aluminum, Brass, Steel
Brass, Aluminum, Steel
Steel, Brass, Aluminum
What is the correct label for A and B shown in the figure below?
A - Tension; B- Compression
A - Compression; B - Tension
A - Torsion; B - Tension
The bulk modulus of three materials are listed below. Arrange them from highest to lowest compressibility.
A : 2 x 1010 N/m2
B : 4 x 1010 N/m2
C : 10 x 1010 N/m2
A, B, C
B, C, A
C, B, A
Compressibility is the inverse of bulk modulus.
True
False
How much force is required to shear off a metal sheet whose thickness is 2mm and width of 40cm? The shear stress is 5 x 107 N/m2.
400 kN
40 kN
4 kN
A 5cm cube of substance has its upperface displaced by 0.65cm by a tangential force of 0.25N. Calculate the modulus of rigidity.
769 Pa
7.69 Kpa
769 MPa
A nylon string, has a diameter of 2mm, is pulled by a force of 100N. Determine the stress.
315 MPa
31.5 MPa
3.15 MPa
A 1-m long cord is pulled by a force causing its length to change by 2mm. Determine the strain.
0.2
0.02
0.002
A concrete has a height and unit area of 5 m and 3sq.m., respectively. If it supports a mass of 30,000 kg and its height changes by 0.025mm, what is its modulus of elasticity of this concrete?
2.00 GPa
19.6 GPa
2.00 MPa
A concrete has a height and unit area of 5 m and 3sq.m., respectively. If it supports a mass of 30,000 kg and its height changes by 0.025mm, what is its modulus of elasticity of this concrete?
2.00 GPa
19.6 GPa
2.00 MPa
Which of the following does NOT determine shear modulus?
Force
Area
Shear strain
Volume
Increasing shearing force on a steel metal sheet results to lesser shear strain.
True
False
Which is the correct equation to find the change in length of a cylindrical metal rod the experience a tensile stress?
A
B
C
Which is the correct equation to find the change in length of a cylindrical metal rod the experience a tensile stress?
A
B
C
Young's modulus is defined a
Tensile strain/Tesnsile stress
Tensile stress*Tensile strain
Tensile stress/Tensile strain
Length/area
With rise in temperature, the Young’s modulus of elasticity of a material
Increases
May increase or decrease
Does not change
Decreases
The limit beyond which the material does not behave elastically is known as
Proportional limit
Plastic limit
Elastic limit
Yield Point
The section modulus of a rectangular section(b*d) about an axis through its C.G. and parallel to the base ‘b’ is
bd3/3
bd3/4
bd3/6
bd3/12
Due to the forces acting, a horizontal beam is in:
Shear
Compression
Tension
None
The unit of Young’s modulus of elasticity is:
pascals
metres
dimension-less
newtons
A wire is stretched 3 mm by a force of 150 N. Assuming the elastic limit is not exceeded, the force that will stretch the wire 5 mm is:
150 N
90 N
250 N
450 N
Due to forces acting, a pillar supporting a bridge is in:
compression
shear
tension
none
The spring balance does not read properly after its long use, because
The elasticity of spring increases
The elasticity decreases
Its plastic power decreases
Its plastic power increases
When compared with solids and liquids, the gases have
Minimum volume elasticity
Maximum volume elasticity
Maximum Young's modulus
Maximum modulus of rigidity
