MHT CET 2019 3rd May Morning Shift | Elasticity Question 7 | Physics

A wire of length $L$ and radius $r$ is rigidly fixed at one end. On stretching the other end of the wire with a force $F$, the increase in length is $I$. If another wire of the same material but double the length and radius is stretched with a force $2 F$, then increase in length is

$\frac{l}{4}$

$2l$

$\frac{l}{2}$

$l$

MHT CET 2019 2nd May Evening Shift

MCQ (Single Correct Answer)

-0

A wire of length ' $L$ ' and area of cross section ' $A$ ' is made of material of Young's modulus ' $r$. It is stretched by an amount ' $x$ '. The work done in stretching the wire is

$\frac{Y x^2 A}{2 L}$

$\frac{2 Y x^2 A}{L}$

$\frac{Y \times A}{2 L}$

$\frac{Y x^2 A}{2}$

MHT CET 2019 2nd May Evening Shift

MCQ (Single Correct Answer)

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A lift is tied with thick iron ropes having mass ' $M$ '. The maximum acceleration of the lift is ' $a$ ' $\mathrm{m} / \mathrm{s}^2$ and maximum safe stress is ' S ' $\mathrm{N} / \mathrm{m}^2$. The minimum diameter of the rope is

$\left[\frac{6 M(g+a)}{\pi S}\right]^{\frac{1}{2}}$

$\left[\frac{4 M(g+a)}{\pi S}\right]^{\frac{1}{2}}$

$\left[\frac{M(g+a)}{\pi S}\right]^{\frac{1}{2}}$

$\left[\frac{M(g-a)}{\pi S}\right]^{\frac{1}{2}}$

MHT CET 2019 2nd May Morning Shift

MCQ (Single Correct Answer)

-0

1. Two identical wires of substances ' $P$ ' and ' $Q$ ' are subjected to equal stretching force along the length. If the elongation of ' $Q$ ' is more than that of ' $P$ ', then

both $P$ and $Q$ are equally elastic

$P$ is more elastic than $Q$

$P$ is plastic and $Q$ is elastic

$Q$ is more elastic than $P$

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