1
Which of the following has no unit
Answer: strain
Questions
2
For steel, the ultimate strength in shear as compared to in tension is nearly
Answer: half
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
Answer: 8 tonnes/cm2
4
True stress-strain curve for materials is plotted between
Answer: load/instantaneous cross-sectional area original area and log.
5
The intensity of stress which causes unit strain is called
Answer: modulus of elasticity
6
Percentage reduction of area in performing tensile test on cast iron may be of the order of
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
Answer: same amount
9
Tensile strength of a material is obtained by dividing the maximum load during the test by the
Answer: original cross-sectional area
10
The ultimate tensile stress of mild steel compared to ultimate compressive stress is
Answer: more
11
If the radius of wire stretched by a load is doubled, then its Young’s modulus will be
Answer: remain unaffected
12
Modulus of rigidity is defined as the ratio of
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
Answer: increase uniformly first and then increase rapidly
14
The materials having same elastic properties in all directions are called
Answer: isotropic materials
15
It equal and opposite forces applied to a body tend to elongate it, the stress so produced is called
Answer: tensile stress
16
Deformation per unit length in the direction of force is known as
Answer: linear strain
18
Young’s modulus is defined as the ratio of
Answer: longitudinal stress and longitudinal strain
