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WorksheetsOCR material definitions
Total questions: 22
Worksheet time: 26mins
Choose the property being described
the ratio stress/strain when a material is stretched elastically
Brittleness
Hardness
Toughness
Stiffness
Strength
Choose the property being described
the tendency to break by crack propagation
Toughness
Brittleness
Hardness
Strength
Stiffness
Choose the property being described
The stress required to break a material
Elasticity
Hardness
Toughness
Stiffness
Strength
Choose the property being described
A measure of the difficulty of scratching or denting the material
Elasticity
Hardness
Toughness
Stiffness
Strength
Choose the property being described
a measure of the stress a material can take before yielding
Brittleness
Plasticity
Stiffness
Strength
Choose the property being described
a measure of a material’s resistance to stretching or bending
Brittleness
Plasticity
Stiffness
Strength
Choose the property being described
the tendency of a material to break by crack propagation
Brittleness
Plasticity
Stiffness
Strength
A wine glass can support large compressive stress, but may shatter, by crack propagation, if dropped a small distance onto a hard surface.
Choose the two properties of glass from the list that best fit the statement about the wine glass.
brittle
elastic
plastic
strong
tough
Which statement about mechanical properties of materials is not correct?
Cracks are a common way in which a brittle material can fail mechanically.
A material with a high Young modulus will be very stiff.
The tensile strength of a stiff material can be relatively small.
If a material is tough it will also usually be brittle.
Which of these terms relates to the force per unit area at which a material begins to deform plastically?
Breaking Stress
Breaking Strain
Yield Stress
Yield Strain
Which one of the following could not be used as a unit of stress?
Pa
Nm-2
Jm-3
kgms-2
An elastic spring, of force constant k = 100 N m−1, is extended by 6 cm. What is the energy stored in the spring at this extension?
0.18 J
0.36 J
3.0 J
6.0 J
The length of a square paving stone is 0.500 ± 0.002 m.
The percentage uncertainty in this measurement is 0.4%.
The area of the paving slab is 0.250 m2.
What is the uncertainty in the value for the area?
± 0.0004 m2
± 0.0010 m2
± 0.0020 m2
± 0.0040 m2
Which of the following is the correct equation for calculating Young's Modulus?
E=AF×Lx
E=xF×LA
E=AF×xL
E=LF×Ax
A wire of length 1.500 m extends to 1.504 m when a 29.4 N weight is hung from it. The diameter of the wire is 0.32 mm. Which line gives the correct values?
x = 0.004 m L = 1.504m A = 8.0 x 10-8 m2
x = 0.004 m L = 1.504m A = 3.2 x 10-7 m2
x = 0.004 m L = 1.500 A = 8.0 x 10-8 m2
x = 0.004 m L = 1.500 A = 3.2 x 10-7 m2
A wire of length 1.500 m extends to 1.504 m when a 29.4 N weight is hung from it. The diameter of the wire is 0.32 mm. What is the Young modulus of the material of the wire?
2.4 x 105 Pa
9.7 x 105 Pa
3.4 x 1011 Pa
1.4 x 1011 Pa
A weight of 20 N is suspended from a steel wire.
What is the extension of the wire?
Data:
original length of wire = 2.5 m
cross–sectional area of wire = 7.0 × 10−8 m2
Young Modulus of the wire material = 2.1 × 1011 Pa
0.0030 m
0.0034 m
0.030 m
0.034 m
The stress–strain graphs for four different materials are shown.
Which diagram shows the stress–strain graph for a ductile metal?
A
B
C
D
The stress–strain graphs for four different materials are shown.
Which diagram shows the stress–strain graph for a rubber polymer?
A
B
C
D
The graph shows how the length of a perspex strip varies with tension force F.
The strip has a cross-sectional area of 4 mm2 when it breaks at Q.
Which of the following statements agree with this data?
1. The strain at P is 2%.
2. The breaking stress is 20 × 106 Pa.
3. Hooke's law is obeyed up to a strain of 0.04.
1,2 and 3 are correct
only 1 and 2 are correct
only 2 and 3 are correct
only 1 is correct
The graph shows how the length of a perspex strip varies with tension force F.
The strip has a cross-sectional area of 4 mm2 when it breaks at Q.
Which of the following is the best estimate for the Youngs Modulus of the perspex?
103 Pa
106 Pa
109 Pa
1011 Pa
The graph shows how the length of a perspex strip varies with tension force F.
The strip has a cross-sectional area of 4 mm2 when it breaks at Q.
Which of the following statements is correct
The breaking Stress is 4 x 107 Pa
Hooke's Law is obeyed upto a force of 60N
The stress at P is 0.2%
The strain at P is 0.02%
