Strength of Materials Quiz | Strength of Materials Multiple Choice Questions and Answers

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Questions
1 Which of the following has no unit
A kinematic viscosity
B surface tension
C bulk modulus
D strain

Answer: strain
2 For steel, the ultimate strength in shear as compared to in tension is nearly
A same
B half
C one-third
D two-third

Answer: half
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3 During a tensile test on a specimen of 1 cm cross-section, maximum load observed was 8 tonnes and area of cross-section at neck was 0.5 cm2. Ultimate tensile strength of specimen is
A 4 tonnes/cm2
B 8 tonnes/cm2
C 16 tonnes/cm2
D none of the mentioned

Answer: 8 tonnes/cm2
4 True stress-strain curve for materials is plotted between
A load/original cross-sectional area and change in length/original length
B load/instantaneous cross-sectional area original area and log.
C load/instantaneous cross-sectional area and change in length/original length
D load/instantaneous area and instantaneous area/original area

Answer: load/instantaneous cross-sectional area original area and log.
5 The intensity of stress which causes unit strain is called
A unit stress
B bulk modulus
C modulus of rigidity
D modulus of elasticity

Answer: modulus of elasticity
6 Percentage reduction of area in performing tensile test on cast iron may be of the order of
A 50%
B 25%
C 0%
D 15%

Answer: 0%
7 The Young’s modulus of a wire is defined as the stress which will increase the length of wire compared to its original length
A half
B same amount
C double
D None of these

Answer: same amount
8 The impact strength of a material is an index of its
A toughness
B tensile strength
C capability of being cold worked
D hardness

Answer: toughness
9 Tensile strength of a material is obtained by dividing the maximum load during the test by the
A area at the time of fracture
B original cross-sectional area
C minimum area after fracture
D none of the above

Answer: original cross-sectional area
10 The ultimate tensile stress of mild steel compared to ultimate compressive stress is
A same
B more
C less
D unpredictable

Answer: more
11 If the radius of wire stretched by a load is doubled, then its Young’s modulus will be
A doubled
B halved
C become four times
D remain unaffected

Answer: remain unaffected
12 Modulus of rigidity is defined as the ratio of
A longitudinal stress and longitudinal strain
B volumetric stress and volumetric strain
C lateral stress and lateral strain
D shear stress and shear strain

Answer: shear stress and shear strain
13 A thin mild steel wire is loaded by adding loads in equal increments till it breaks. The extensions noted with increasing loads will behave as under
A uniform throughout
B increase uniformly
C first increase and then decrease
D increase uniformly first and then increase rapidly

Answer: increase uniformly first and then increase rapidly
14 The materials having same elastic properties in all directions are called
A ideal materials
B uniform materials
C isotropic materials
D paractical materials

Answer: isotropic materials
15 It equal and opposite forces applied to a body tend to elongate it, the stress so produced is called
A internal resistanpe
B tensile stress
C transverse stress
D compressive stress

Answer: tensile stress
16 Deformation per unit length in the direction of force is known as
A strain
B lateral strain
C linear strain
D linear stress

Answer: linear strain
17 The unit of Young’s modulus is
A kg/cm2
B kg cm2
C mm/mm
D kg

Answer: kg/cm2
18 Young’s modulus is defined as the ratio of
A longitudinal stress and longitudinal strain
B lateral stress and lateral strain
C volumetric stress and volumetric strain
D longitudinal stress and lateral strain.

Answer: longitudinal stress and longitudinal strain
19 Hooke’s law holds good up to
A yield point
B limit of proportionality
C breaking point
D elastic limit

Answer: limit of proportionality
20 Strain is defined as the ratio of
A change in volume to original volume
B change in length to original length
C change in cross-sectional area to original cross-sectional area
D any one of the above

Answer: any one of the above

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