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