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Strengths of Meterials Online Quiz Questions test1
Strengths of Meterials Online Quiz Questions test1
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1. Question1
change in volume to original volume
change in length to original length
change in cross-sectional area to original cross-sectional area
any one of the above
2. Hooke's law holds good upto _____.
yield point
limit of proportionality
breaking point
elastic limit
3. Young's modulus is defined as the ratio of _____.
volumetric stress and volumetric strain
lateral stress and lateral strain
longitudinal stress and longitudinal strain
shear stress to shear strain
4. The unit of Young's modulus is _____.
mm/mm
kg/cm
kg
kg/cm2
5. Deformation per unit length in the direction of force is known as _____.
strain
lateral strain
linear strain
linear stress
6. It equal and opposite forces applied to a body tend to elongate it, the stress so produced is called ____.
internal resistanpe
tensile stress
transverse stress
compressive stress
7. The materials having same elastic properties in all directions are called _____.
ideal materials
uniform materials
isotropic materials
paractical materials
8. 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
uniform throughout
increase uniformly
first increase and then decrease
increase uniformly first and then in-crease rapidly
9. Modulus of rigidity is defined as the ratio of _____.
longitudinal stress and longitudinal strain
volumetric stress and volumetric strain
lateral stress and lateral strain
shear stress and shear strain
10. If the radius of wire stretched by a load is doubled, then its Young's modulus will be ____.
doubled
halved
become four times
remain unaffected
11. The ultimate tensile stress of mild steel compared to ultimate compressive stress is ______.
same
more
less
more or less depending on other factors
12. Tensile strength of a material is obtained by dividing the maximum load during the test by the ____.
area at the time of fracture
original cross-sectional area
average of (a) and (b)
minimum area after fracture
13. The impact strength of a material is an index of its _____.
toughness
tensile strength
capability of being cold worked
hardness
14. The Young's modulus of a wire is defined as the stress which will increase the length of wire compared to its original length
half
same amount
double
one-fourth
15. Percentage reduction of area in performing tensile test on cast iron may be of the order of _____.
50%
25%
0%
15%
16. The intensity of stress which causes unit strain is called
unit stress
bulk modulus
modulus of rigidity
modulus of elasticity
17. True stress-strain curve for materials is plotted between
load/original cross-sectional area and change in length/origmal length
load/instantaneous cross-sectional area original area and log
load/instantaneous cross-sectional area and change in length/original length
load/instantaneous area and instan-taneous area/original area
18. 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 _____.
4 tonnes/cm2
8 tonnes/cm2
16 tonnes/cm2
22 tonnes/cm2
19. For steel, the ultimate strength in shear as compared to in tension is nearly _____.
same
half
one-third
two-third
20. Which of the following has no unit ______.
kinematic viscosity
surface tension
bulk modulus
strain
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