# Stress and Strain MCQs | Stress and Strain Multiple Choice Questions and Answers

Questions
1 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
2 Young's modulus is defined as the ratio of
A volumetric stress and volumetric strain
B lateral stress and lateral strain
C longitudinal stress and longitudinal strain
D shear stress to shear strain

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

4 The materials having same elastic properties in all directions are called
A ideal materials
B uniform materials
C isotropic materials
D paractical materials

5 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
6 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
7 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 average of (a) and (b)
D None Of The Above

8 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 one-fourth

9 Percentage reduction of area in performing tensile test on cast iron may be of the order of
A 50%
B 25%
C 0%
D None of the Above

10 The intensity of stress which causes unit strain is called
A unit stress
B bulk modulus
C modulus of rigidity
D modulus of elasticity

11 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 22 tonnes/cm2

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

13 If a part is constrained to move and heated, it will develop
A principal stress
B tensile stress
C compressive stress
D None of the above

14 The value of modulus of elasticity for mild steel is of the order of
A 2.1xl05 kg/cm2
B 2.1 X 106 kg/cm2
C 2.1 x 107 kg/cm2
D 0.1 xlO6 kg/cm2

15 The value of Poisson's ratio for steel is between
A 0.01 to 0.1
B 0.23 to 0.27
C 0.25 to 0.33
D 0.4 to 0.6

16 The buckling load for a given material depends on
A slenderness ratio and area of cross-section
B Poisson's ratio and modulus of elasticity
C slenderness ratio and modulus of elasticity
D slenderness ratio, area of cross-section and modulus of elasticity

Answer: slenderness ratio, area of cross-section and modulus of elasticity
17 The total elongation produced in a bar of uniform section hanging vertically downwards due to its own weight is equal to that produced by a weight
A of same magnitude as that of bar and applied at the lower end
B half the weight of bar applied at lower end
C half of the square of weight of bar applied at lower end
D one-fourth of weight of bar applied at lower end

Answer: half the weight of bar applied at lower end
18 The property of a material by virtue of which a body returns to its original, shape after removal of the load is called
A plasticity
B elasticity
C ductility
D malleability

19 The materials which exhibit the same elastic properties in all directions are called
A homogeneous
B inelastic
C isotropic
D isentropic