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Test: Elastic Moduli - NEET MCQ


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10 Questions MCQ Test Physics Class 11 - Test: Elastic Moduli

Test: Elastic Moduli for NEET 2024 is part of Physics Class 11 preparation. The Test: Elastic Moduli questions and answers have been prepared according to the NEET exam syllabus.The Test: Elastic Moduli MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Elastic Moduli below.
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Test: Elastic Moduli - Question 1

An Indian rubber cube of side 10 cm has one side fixed while a tangential force of 1800 N is applied to the opposite side. Find the shear strain produced. Take η = 2 x 106 N/ m2.

Test: Elastic Moduli - Question 2

The length of the wire is increased by 1 mm on the application of a given load. In a wire of the same material but of length and radius twice that of the first, on application of the same force, extension produced is

Detailed Solution for Test: Elastic Moduli - Question 2

Young's Modulus of elasticity =stress/strain
Y= [F/a/△l/l] ​ or Y= [Fl​/a△l]
or △l= [Fl/aY] ​= Fl​/ πr2Y
In the given problem, △l∝ l​/ r2
When both l and r are doubled, △l is halved.

Test: Elastic Moduli - Question 3

Young’s modulus is defined as the ratio of longitudinal stress to longitudinal strain. Which of the following is the unit of Young’s modulus?

Detailed Solution for Test: Elastic Moduli - Question 3

Stress = Force per area and strain is unit less.
Therefore in CGS units dyne per cm square.
Hence A is correct.

Test: Elastic Moduli - Question 4

The volume of a spherical body is decreased by 10-3% when it is subjected to pressure of 40 atmospheres. Find the bulk modulus of body.
(1 atm = 1.01 x 105 N/m2).

Detailed Solution for Test: Elastic Moduli - Question 4

We know that magnitude of bulk modulus
K=[P/(dV/V)]
Now, percentage change in volume is. 10-3 %
Therefore, (dV/V)x100=10-3
So, dV/V=10-5
Hence, k is,
K=40atm/10-5=40x1.01x105 /10-5 =4.04x1011 N/m

Test: Elastic Moduli - Question 5

The materials which have the same elastic properties in all directions are called __________.

Detailed Solution for Test: Elastic Moduli - Question 5

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

Test: Elastic Moduli - Question 6

How does the modulus of elasticity change with temperature?

Detailed Solution for Test: Elastic Moduli - Question 6

As the temperature increases, the inter-atomic distance also increases. So, it results in an increase in the area (stress = force /area). As the area increases stress decreases, this results in a decrease in Young's modulus.

Test: Elastic Moduli - Question 7

What type of stress is produced in a body when the deforming force produces sheer strain?

Detailed Solution for Test: Elastic Moduli - Question 7

Explanation:

When a deforming force is applied to a body in a direction parallel to its surface, it produces a shear strain. Shear strain is the deformation that occurs when one layer of a material slides past another layer. This type of deformation produces shear stress, which is the force that is acting parallel to the surface of the material. Shear stress is calculated as the force per unit area and is expressed in units of pressure, such as pascals (Pa) or pounds per square inch (psi).

Test: Elastic Moduli - Question 8

Modulus of rigidity is defined as the

Detailed Solution for Test: Elastic Moduli - Question 8

Modulus of rigidity is defined as the ratio of Shear stress to shear strain.

Test: Elastic Moduli - Question 9

Which of the following represents Hooke’s Law?

Detailed Solution for Test: Elastic Moduli - Question 9

E=stress/strain
Strain x E= Stress

Test: Elastic Moduli - Question 10

An iron bar of length l cm and cross section A cm2 is pulled by a force F dynes from the ends so as to produce an elongation l cm. Which of the following statements is correct?

Detailed Solution for Test: Elastic Moduli - Question 10

F =AYΔl/L
Δl = FL/AY

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