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Chapter:

Simple-Stress-and-Strain

1. The law which states that within elastic limits strain produced is proportional to stress producing it is known as _________

Bernoulli’s law Hooke’s law Stress law Poisson’s law

Hooke’s law

Hooke?s law states that strain is directly proportional to strain produced by stress when a material is loaded within elastic limit.

Hint Answer

2. The materials which have same elastic properties in all directions are called ______

Isotropic Brittle Homogeneous Hard

Isotropic

Same elastic properties in all direction is called homogenity of a material.

Hint Answer

3. The Youngs modulus of elasticity of a material is 2.5 times its modulus of rigidity. Then what will be its Poissons ratio?

0.25 0.33 0.50 0.60

0.25

As we know E = 2G(1 + ?) so putting values of E = 2.5G n we get ?= 0.25.

Hint Answer

4. Which one of following pairs is NOT correctly matched?

Visco-elastic – small plastic zone Orthotropic material – different properties in three perpendicular directions Strain hardening material – stiffening effect felt at some stage Isotropic material – same physical property in all directions at a point

Visco-elastic – small plastic zone

Visco-elastic material exhibit a mixture of creep and elastic after effects at room temperature. Thus ir behaviour is time dependent. Materials with different properties in different directions are called anisotropic. Orthotropic material is a special case of an anisotropic material in three mutually perpendicular directions. However, se are symmetric about any axis.

Hint Answer

5. An experiment was done and it was found that bulk modulus of a material is equal to its shear modulus. Then what will be its Poissons ratio?

0.125 0.150 0.200 0.375

0.125

We know that, ? = (3K ? 2G) / (6K + 2G)
Here K = G
Therefore, ? = 3-2 / 6+2 = 0.125.

Hint Answer

6. A solid cube is subjected to equal normal forces on all its faces. The volumetric strain will be x-times linear strain in any of three axes when?

X=1 X=2 X=3 X=4

X=3

The volumetric strain is change in dimension in three directions and linear strain depends on change in only one direction so volumetric strain is 1 times linear strain in any of three directions.

Hint Answer

7. Elastic limit is point ________

up to which stress is proportional to strain At which elongation takes place without application of additional load Up to which if the load is removed, original volume and shapes are regained None of the mentioned

Up to which if the load is removed, original volume and shapes are regained

The elastic limit is that limit up to which any material behaves like an elastic material.

Hint Answer

8. What is ratio of Youngs modulus E to shear modulus G in terms of Poissons ratio?

2(1 + μ) 2(1 – μ) 1/2 (1 – μ) 1/2 (1 + μ)

2(1 + μ)

As we know G = E / 2(1 +?) so this gives ratio of E to G = 2(1 + ?).

Hint Answer

9. Where is necking region?

The area between lower yield point and upper yield point The area between the plastic limit and elastic limit The area between the ultimate point and initial point The area between the ultimate point and rupture

The area between the ultimate point and rupture

Necking is a tensile strain deformation which is cased in after ultimate amount of stress occurs in material.

Hint Answer

10. Which of relationship between E, G and K is true, where E, G and K have ir usual meanings?

E = 9KC / (3K + C) E = 9KC / (9K + C) E = 3KC / (9K + C) E = 3KC / (3K + C)

E = 9KC / (3K + C)

As we know E = 2G(1 + ?) = 3K(1 ? 2?) = 9KG / (3K + G).

Hint Answer

Nexttt

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Topics

This Chapter Simple-Stress-and-Strain consists of the following topics

Simple Stress and Strain

The law which states that within elastic limits strain produced is proportional to stress producing it is known as _________

The materials which have same elastic properties in all directions are called ______

The Youngs modulus of elasticity of a material is 2.5 times its modulus of rigidity. Then what will be its Poissons ratio?

Which one of following pairs is NOT correctly matched?

An experiment was done and it was found that bulk modulus of a material is equal to its shear modulus. Then what will be its Poissons ratio?

A solid cube is subjected to equal normal forces on all its faces. The volumetric strain will be x-times linear strain in any of three axes when?

Elastic limit is point ________

What is ratio of Youngs modulus E to shear modulus G in terms of Poissons ratio?

Where is necking region?

Which of relationship between E, G and K is true, where E, G and K have ir usual meanings?

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