Download App

STD 11- 8. mechanical properties of solids — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 11- 8. mechanical properties of solids4 Marks
Question
When a certain weight is suspended from a long uniform wire, its length increases by one  $cm$. If the same weight is suspended from another wire of the same material and length  but having a diameter half of the first one, the increase in length will be ......... $cm$
✓

Answer

c
$\mathrm{y}=\frac{\mathrm{Fl}}{\alpha \Delta \mathrm{l}}$ or $\Delta \mathrm{l} \propto \frac{1}{\alpha} ; \Delta 1 \propto \frac{1}{\mathrm{D}^{2}}$

$\frac{\Delta \mathrm{l}_{2}}{\Delta \mathrm{l}_{1}}=\frac{\mathrm{D}_{1}^{2}}{\mathrm{D}_{2}^{2}}=4$ or $\Delta \mathrm{l}_{2}=4 \Delta \mathrm{l}_{1}=4 \mathrm{cm}$

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

JEE STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

If power dissipated in the circuit is $150\,W,$ then value of $R$ is ............... $\Omega$
→
At high altitude, a body explodes at rest into two equal fragments with one fragment receiving horizontal velocity of $10 \,m/s$. Time taken by the two radius vectors connecting point of explosion to fragments to make $90^o $ is ............ $\mathrm{s}$
→
A ray reflected successively from two plane mirrors inclined at a certain angle undergoes a deviation of $270^o$ after total two reflections. The number of images observable are
→
Two bulbs of $100\, W$ and $200\, W$ working at $220$ $volt$ are joined in series with $220$ $volt$ supply. Total power consumed will be approximately ........... $watt$
→
A wire has resistance of $24\,\Omega$ is bent in the following shape. The effective resistance between $A$ and $B$ is .............. $\Omega$
→
Two cars P and Q are moving on a road in the same direction. Acceleration of car P increases linearly with time whereas car Q moves with a constant acceleration. Both cars cross each other at time $t=0$, for the first time. The maximum possible number of crossing(s) (including the crossing at $t =0$ ) is _________
→
An inductor of $10\, {mH}$ is connected to a $20\, {V}$ battery through a resistor of $10\, {k}\, \Omega$ and a switch. After a long time, when maximum current is set up in the circuit, the current is switched off. The current in the circuit after $1\, \mu\, {s}$ is $\frac{{x}}{100}\, {mA}$. Then ${x}$ is equal to ...... .

(Take $\left.{e}^{-1}=0.37\right)$

→
For $VHF$ signal broadcasting, $km ^{2}$ of maximum service area will be covered by an antenna tower of height $30\, m$, if the receiving antenna is placed at ground. Let radius of the earth be $6400\, km$. (Round off to the Nearest Integer) (Take $\pi$ as $3.14$)
→
$16$ tunning forks are arranged in the order of increasing frequencies. Any two successive forks give $8$ beats per sec when sounded together. If the frequency of the last fork is twice the first, then the frequency of the first fork is
→
A bucket tied at the end of a $1.6\, m$ long string is whirled in a vertical circle with constant speed. What should be the minimum speed so that the water from the bucket does not spill, when the bucket is at the highest position ........ $m/sec$ (Take $g = 10\,m/{\sec ^2}$)
→