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Test: Mechanical Properties of Materials - 1 - Mechanical Engineering MCQ


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10 Questions MCQ Test Strength of Materials (SOM) - Test: Mechanical Properties of Materials - 1

Test: Mechanical Properties of Materials - 1 for Mechanical Engineering 2024 is part of Strength of Materials (SOM) preparation. The Test: Mechanical Properties of Materials - 1 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Mechanical Properties of Materials - 1 MCQs are made for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Mechanical Properties of Materials - 1 below.
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Test: Mechanical Properties of Materials - 1 - Question 1

Strain is defined as ratio of

Detailed Solution for Test: Mechanical Properties of Materials - 1 - Question 1

The strain is defined as the ratio of change in dimension to the original dimension.

If ‘δl’ changes in the length and ‘l’ is the original length, strain = δl/l

Important Terms:

  • The ratio of change in length to the original length is called the longitudinal strain.
  • The ratio of change in diameter/breadth to original diameter/breadth is called the lateral strain.
  • The volumetric strain of a deformed body is defined as the ratio of the change in volume of the body to the deformation to its original volume.
  • Shear strain is defined as the strain accompanying a shearing action. It is the angle in radian measure through which the body gets distorted when subjected to external shearing action.
Test: Mechanical Properties of Materials - 1 - Question 2

Consider the following stress-strain diagram and match the following:
List - I

List - II
1. Hard rubber
2. Soft rubber
3. Structural steel
4. Aluminium alloy

Test: Mechanical Properties of Materials - 1 - Question 3

Young's modulus is defined as the ratio of

Detailed Solution for Test: Mechanical Properties of Materials - 1 - Question 3

The linear relationship between stress and strain for a bar in simple tension or compression can be expressed by the equation

in which Eis a constant of proportionality known as modulus of elasticity for the material. The modulus of elasticity is the slope of the stress- strain diagram in the linearly elastic region and its value depends upon the particular material being used.

Test: Mechanical Properties of Materials - 1 - Question 4

Match List-I (Material) with List-ll (Young’s modulus):


Detailed Solution for Test: Mechanical Properties of Materials - 1 - Question 4

Test: Mechanical Properties of Materials - 1 - Question 5

The permanent mode of deformation of a material known as ____________

Detailed Solution for Test: Mechanical Properties of Materials - 1 - Question 5

Plasticity is defined as the property of a material due to which it is permanently deformed due to loading. Elasticity is the temporary form of deformation. Twinning and Slip are mechanisms of Plastic deformation.

Test: Mechanical Properties of Materials - 1 - Question 6

A thin mid steel wire is loaded by adding loads in equal increments till it breaks. The extensions noted with increasing loads will behave as under

Detailed Solution for Test: Mechanical Properties of Materials - 1 - Question 6

At first, the strain is proportional to strain or elongation is proportional to the load giving a straight-line relationship.

A further increase in the load after yield load will cause marked deformation in the whole volume of the metal. The maximum load which the specimen can withstand without failure is called the load at the ultimate strength.

Test: Mechanical Properties of Materials - 1 - Question 7

Match List-1 (Materia!) with List-ll (Poisson’s Ratio)

Test: Mechanical Properties of Materials - 1 - Question 8

In a tensile testing experiment on a specimen of 1 cm2 area, the maximum load observed was 5 tonnes and neck area 0.25 cm2. The ultimate tensile strength of specimen is

Detailed Solution for Test: Mechanical Properties of Materials - 1 - Question 8

Ultimate tensile strength is corresponding to the maximum load and cross-sectional area of the specimen at the start of the test.

Ultimate tensile strength = 

Area = 1 cm2 and maximum load = 5 tonnes
So ultimate tensile strength = 5 tonnes/1 cm2 = 5 tonnes/cm2

Test: Mechanical Properties of Materials - 1 - Question 9

The ability of a material to resist plastic deformation known as _____________

Detailed Solution for Test: Mechanical Properties of Materials - 1 - Question 9

The point of stretching where it increases suddenly is known as yield strength, i.e. the region where the stretch is elastic. Tensile strength is the force needed to fracture the material. Impact strength is the capacity of a material to resist shock energy before a fracture.
 

Test: Mechanical Properties of Materials - 1 - Question 10

Resilience of a material is considered when it is subjected to

Detailed Solution for Test: Mechanical Properties of Materials - 1 - Question 10

It is the property of materials to absorb energy and to resist shock and impact loads. It is measured by the amount of energy absorbed per unit volume within elastic limit this property is essential for spring materials. The resilience of material should be considered when it is subjected to shock loading.

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