Download App

STD 11 - 14. waves and sound — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 14. waves and sound4 Marks
MCQ
A second harmonic has to be generated in a string of length $l$ stretched between two rigid supports. The point where the string has to be plucked and touched are
  • ✓
    Plucked at $\frac{l}{4}$ and touch at $\frac{l}{2}$
  • B
    Plucked at $\frac{l}{4}$ and touch at $\frac{{3l}}{4}$
  • C
    Plucked at $\frac{l}{2}$ and touched at $\frac{l}{4}$
  • D
    Plucked at $\frac{l}{2}$ and touched at $\frac{{3l}}{4}$
✓

Answer

Correct option: A.
Plucked at $\frac{l}{4}$ and touch at $\frac{l}{2}$
a
(a) Second harmonic means $2$ loops in a total length
Hence plucking distance from one end $ = \frac{l}{{2p}} = \frac{l}{{2 \times 2}} = \frac{l}{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

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

Similar questions

Consider a solid insulating sphere of radius $R$ with charge density varying as $\rho = \rho_0r^2$  ($\rho_0$  is a constant and r is measure from centre).Consider two points $A$ and $B$ at distance $x$ and $y$ respectively ($x < R, y > R$) from the centre. If magnitudes of electric fields at points $A$ and $B$ are equal, then
→
The root mean square speed of smoke particles of mass $5 \times 10^{-17}\,kg$ in their Brownian motion in air at NTP is approximately $.......\,mm\,s ^{-1}$ [Given $k =1.38 \times 10^{-23}\,J\,K ^{-1}$ ]
→
A particle moves along a circle of radius $\left( {\frac{{20}}{\pi }} \right)\,m$ with constant tangential acceleration. If the velocity of the particle is $80 \,m/s$ at the end of the second revolution after motion has begin, the tangential acceleration is
→
In the figure shown the electric potential energy of the system is: ( $q$ is at the centre of the conducting neutral spherical shell of inner radius $a$ and outer radius $b$ )
→
If velocity $[V],$ time $[T]$ and force $[F]$ are chosen as the base quantities, the dimensions of the mass will be
→
Two spheres of radius $R$ and $2R$ having charge $Q$ and $2Q$ respectively are placed far away from each other. How much charge will flow when key $'k'$ is pressed ?
→
Two bodies starts moving from same point along a straight line with velocities $v_1=6 \,m / s$ and $v_2=10 \,m / s$, simultaneously. After what time their separation becomes $40 \,m$ is ........ $s$
→
Which of the following could not produce a virtual image
→
In $NPN$ transistor, if doping in base region is increased then collector current
→
Say switches $S_1, S_2$ and so on upto $S_6$ are closed, one after other in order (first $S_1$, then $S_2$) at regular intervals of $1$ minute starting from $t = 0$. The graph of current versus time is best represented as
→