Below the 1000+ Questions with detail solution on Property of Materials of strength of materials subject, which were asked in various competitive exam of Civil Engineer for various posts.
Question 1.
A material having the same property in all directions is called :
RPSC ACF and FRO 24.02.2021 || Mizoram PSC (PWD) 2020, Paper-I || Assam PSC AE (PRD) 2020 || Haryana PSC AE 2020 Paper-1 || MH PWD 2019 || SSC JE 25.1.2018 (Morning shift) || ISRO TA 25.02.2018 || BMRCL JE 2018 || UKSSSC JE 2017 (UPCL) || ISRO TA 2016 (shift-II) || Nagaland PSC JE 2016 PAPER-II || RSMSSB JE (Diploma) 2015 || ESE 2012 || WBPSC JE 2009 || J & K PSC AE 2009
Homologous
Isotropic
Homogeneous
Elastic
Answer (Detailed Solution Below)
Option isotropic is correct.
Detailed Solution :
Isotropic material : When the elastic properties of material are same in all direction called
isotropic material
Anisotropic material : When elastic properties are different in all direction called anisotropic material.
Homogeneous material : Material having same elastic properties at every point.
Orthotropic material : It is orthotropic material properties are different at a point in perpendicular direction. Exp.– Plywood, sandwich, old rolled sheet.
Question 2.
Limiting values of poisson’s ratio are :
Previously Asked in : SSC JE 2004
-1 and -0.5
0 and 0.52
-1 and 0.5
1 and -0.5
Answer (Detailed Solution Below)
Option 0 and 0.5 is correct
Detailed Solution :
The ratio of lateral strain to longitudinal strain is known as poisson’s ratio (μ).
μ = -Lateral strain / Longitudinal strain
For engineering materials, the value of poisson’s ratio range between 0 to 0.5.
| Material | Poisson’s ratio (μ) |
| Cork | 0 |
| Concrete | 0.1 – 0.2 |
| Aluminium | 0.33 |
| Cast iron | 0.2 – 0.3 |
| Steel | 0.27 – 0.3 |
| Perfectly elastic | 0.5 |
Generally for metal such as (steel, Copper, Aluminium etc) the poisson’s ratio value in the range of 0.25 to 0.40.
Question 3.
The property which permits a material to be drawn out longitudinally to a reduce section is called __________.
Previously Asked in : MP Sub Engineer 2020 || HPSSC JE Code 386/2018 || M.P. VYAPAM Sub Engg 2018
ductility
plasticity
elasticity
malleability
Answer (Detailed Solution Below)
Option Ductility is correct
Detailed Solution :
Ductility : It is the ability of material to deform under tensile stress.
Malleability : A malleable material is one in which a thin sheet can be easily formed by hammering or rolling.
Plasticity: The ability of a solid material to deform permanently when subjected to forces.
Elasticity: is the ability of a body to resist a deformation and to return to its original size and shape when that force is removed.
Question 4.
Which of the following is also called as the True stress ?
Previously Asked in : GWSSB Class 1-2 2021 ||
Cauchy stress
First piola-kirchoff stress
Biot stress
Second Piola-Kirchhoff stress
Answer (Detailed Solution Below)
Option Cauchy stress is correct
Detailed Solution :
Cauchy stress is also called as the true stress Cauchy’s stress theorem states that there exists a second-order tensor filed σ (x,t) called the Cauchy stress tensor, independent of n, such that T is a linear.
function of n :
T(a) = n.σ
Question 5.
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