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JEE Physics

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Chapter 25

Experiment - To Determine Young'S Modulus Of Elasticity Of The Material Of A Metallic Wire. - all with Video Answers

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Chapter Questions

00:33

Problem 2798

Arrange rubber, steel and glass in the order of decreasing elasticity.
(A) glass, steel, rubber
(B) rubber, glass, steel
(C) glass, rubber, steel
(D) steel, glass, rubber

Khoobchandra Agrawal
Khoobchandra Agrawal
Numerade Educator
01:56

Problem 2799

The following wires $\mathrm{A}, \mathrm{B}, \mathrm{C}, \mathrm{D}$, are made of the same material with diff. length and diameter. Which of these will have the largest extension, when the same tension is applied?
(A) length $=200 \mathrm{~cm}$, diameter $=2 \mathrm{~mm}$
(B) length $=50 \mathrm{~cm}$, diameter $=0.5 \mathrm{~mm}$
(C) length $=300 \mathrm{~cm}$, diameter $=3 \mathrm{~mm}$
(D) length $=100 \mathrm{~cm}$, diameter $=1 \mathrm{~mm}$

Khoobchandra Agrawal
Khoobchandra Agrawal
Numerade Educator
00:31

Problem 2800

The compressibility of a substance equals.........
(A) $(\Delta \mathrm{V} / \mathrm{PV})$
(B) $\{(\mathrm{P} \Delta \mathrm{V}) / \mathrm{V}\}$
(C) $\{\mathrm{V} /(\mathrm{P} \Delta \mathrm{V})\}$
(D) $(\mathrm{PV} / \Delta \mathrm{V})$

Khoobchandra Agrawal
Khoobchandra Agrawal
Numerade Educator
02:17

Problem 2801

Two rods of different materials having coefficients of thermal expansions $\alpha_{1}, \alpha_{2}$ and Young's module $\mathrm{y}_{1}, \mathrm{y}_{2}$ respectively are fixed between two rigid walls. The rods are heated such that they undergo the same increase in temperature. There is no bending of the rod. if $\alpha_{1}: \alpha_{2}=2: 3$ the thermal stresses developed in the rod are equal provided $\mathrm{y}_{1}: \mathrm{y}_{2}$ equals.
(A) $3: 2$
(B) $2: 3$
(C) $4: 9$
(D) $1: 1$

Khoobchandra Agrawal
Khoobchandra Agrawal
Numerade Educator
01:21

Problem 2802

A uniform rod of length $L$ and density $\rho$ is being pulled along A smooth floor with a horizontal acceleration $\alpha$ what is the magnitude of the stress at the transverse cross-section through the midpoint of the rod?
(A) $(1 / 3) \operatorname{L} \rho \alpha$
(B) $\operatorname{L} \rho \alpha$
(C) $(2 / 3) \mathrm{L} \rho \rho$
(D) $\{(\operatorname{L} \rho \alpha) / 2\}$

Khoobchandra Agrawal
Khoobchandra Agrawal
Numerade Educator
01:51

Problem 2803

A solid cylindrical steel column is $4 \mathrm{~m}$ long and $9 \mathrm{~cm}$ in diameter $\cdot\left(\mathrm{Y}_{\text {steel }}=1.9 \times 10^{11} \mathrm{Nm}^{-2}\right)$. The decrease in length of the column, while carrying a load of $80000 \mathrm{~kg}$ is........
(A) $3.2 \mathrm{~mm}$
(B) $1.8 \mathrm{~mm}$
(C) $4.4 \mathrm{~mm}$
(D) $2.6 \mathrm{~mm}$

Khoobchandra Agrawal
Khoobchandra Agrawal
Numerade Educator
02:05

Problem 2804

A solid sphere of radius $\mathrm{R}$ made of a material of bulk modulus $\mathrm{K}$ is surrounded by a liquid in a cylindrical container. A massless piston of area A floats on the surface of the liquid. When a mass $\mathrm{M}$ is placed on the pisten to compress the liquid, the fractional change in the radius of the sphere $(\delta \mathrm{R} / \mathrm{R})$ is..........
(A) $\{(\mathrm{Mg}) /(3 \mathrm{KA})\}$
(B) $\{(\mathrm{Mg}) /(\mathrm{KA})\}$
(C) $\{(\mathrm{Mg}) /(4 \mathrm{KA})\}$
(D) $\{(\mathrm{Mg}) /(2 \mathrm{KA})\}$

Khoobchandra Agrawal
Khoobchandra Agrawal
Numerade Educator
01:36

Problem 2805

In searle's experiment, diameter of wire was measured $0.05$ $\mathrm{cm}$ by screw gauge of least count $0.001 \mathrm{~cm}$. The length of wire was measured $110 \mathrm{~cm}$ by metes scale of least count $0.1 \mathrm{~cm}$. When a weight of $50 \mathrm{~N}$ is suspended from the wire, extension is measured to be $0.125 \mathrm{~cm}$ by a micrometer of lecst count $0.001 \mathrm{~cm} .$ Find maximum error in the measurement of Young's modulus of the wire material.
(A) $1.09 \times 10^{12}$
(B) $1.09 \times 10^{10}$
(C) $3.09 \times 10^{10}$
(D) $3.09 \times 10^{12}$

Khoobchandra Agrawal
Khoobchandra Agrawal
Numerade Educator