Embibe Experts Solutions for Chapter: Elasticity, Exercise 5: Exercise (Previous Year Questions)

The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied?

Copper of fixed volume $V$ is drawn into a wire of length $l$. When this wire is subjected to a constant force $F$, the extension produced in the wire is $∆l$. Which of the following graph is a straight line?

The Young's modulus of steel is twice that of brass. Two wires of same length and of same area of cross section, one of steel and another of brass are suspended from the same roof. If we want the lower ends of the wires to be at the same level, then the weights added to the steel and brass wires must be in the ratio of:

The bulk modulus of a spherical object is $B$. If it is subjected to uniform pressure $P$, the fractional decrease in radius is,

Two wires are made of the same material and have the same volume. The first wire has cross-sectional area $A$ and the second wire has cross-sectional area $3A$. If the length of the first wire is increased by $\Delta l$ on applying a force $F$ how much force is needed to stretch the second wire by the same amount?

A string is stretched between two fixed points separated by $75 \mathrm{cm}.$ It is observed to have resonant frequencies of $420 \mathrm{Hz} \mathrm{and} 315 \mathrm{Hz}.$ There are no other resonant frequencies between these two. Then, the lowest resonant frequency for this string is :