Download App

Elasticity — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsElasticity1 Mark
MCQ
There are two wires of same material and same length while the diameter of second wire is 2 times the diameter of first wire, then ratio of extension produced in the wires by applying same load will be
  • A
    $1: 1$
  • B
    $2: 1$
  • C
    $1: 2$
  • ✓
    $4: 1$
✓

Answer

Correct option: D.
$4: 1$
(d)
$l=\frac{F L}{A Y}$
$ \therefore l \propto \frac{1}{r^2}(F, L \text { and } Y \text { are constant })$
$ \frac{l_1}{l_2}=\left(\frac{r_2}{r_1}\right)^2=(2)^2=4$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "MCQ" from Elasticity→Elasticity — all question types→JEE physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

Speed of sound at constant temperature depends on
→
At what distance from a convex lens of focal length $30 \mathrm{~cm}$, an object should be placed so that the size of the image be $1 / 2$ of the object
→
A particle moves for 20 seconds with velocity $3 m / s$ and then velocity $4 m / s$ for another 20 seconds and finally moves with velocity $5 m / s$ for next 20 seconds. What is the average velocity of the particle\
→
Radius of the curved road on national highway is $R$. Width of the road is $b$. The outer edge of the road is raised by $h$ with respect to inner edge so that a car with velocity $v$ can pass safe over it. The value of $h$ is
→
How much work to be done in decreasing the volume of and ideal gas by an amount of $2.4 \times 10^{-4} \mathrm{~m}^3$ at normal temperature and constant normal pressure of $1 \times 10^5 \mathrm{~N} / \mathrm{m}^2$
→
A square coil of side $10\; cm$ consists of $20$ turns and carries a current of $12\; A$. The coil is suspended vertically and the normal to the plane of the coil makes an angle of $30^o$ with the direction of a uniform horizontal magnetic field of magnitude $0.80 \;T$. What is the magnitude of torque (in $N\;m$) experienced by the coil?
→
To convert a galvanometer into a voltmeter, one should connect a
→
The length of Milky way is
→
The penetrating power of X-rays increases with the
→
A $10 \mathrm{~m}$ long wire of $20 \Omega$ resistance is connected with a battery of $3$ volt e.m.f. (negligible internal resistance) and a $10 \Omega$ resistance is joined to it is series. Potential gradient along wire in volt per meter is
→