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 :

(1) Plucked at $\frac{l}{4}$ and touch at $\frac{l}{2}$

(2) Plucked at $\frac{l}{4}$ and touch at $\frac{3l}{4}$

(3) Plucked at $\frac{l}{2}$ and touched at $\frac{l}{4}$

(4) Plucked at $\frac{l}{2}$ and touched at $\frac{3l}{4}$

Concept Questions :-

Standing waves
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The tension of a stretched string is increased by 69%. In order to keep its frequency of vibration constant, its length must be increased by :

(1) 20%

(2) 30%

(3) $\sqrt{69}%$

(4) 69%

Concept Questions :-

Travelling wave on string
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The length of a sonometer wire tuned to a frequency of 250 Hz is 0.60 metre. The frequency of tuning fork with which the vibrating wire will be in tune when the length is made 0.40 metre is :

(1) 250 Hz

(2) 375 Hz

(3) 256 Hz

(4) 384 Hz

Concept Questions :-

Standing waves
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Two uniform strings A and B made of steel are made to vibrate under the same tension. If the first overtone of A is equal to the second overtone of B and if the radius of A is twice that of B, the ratio of the lengths of the strings is -

(1) 1: 2

(2) 1 : 3

(3) 1 : 4

(4) 1 : 6

Concept Questions :-

Standing waves
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Two wires are fixed in a sonometer. Their tensions are in the ratio 8 : 1. The lengths are in the ratio 36 : 35. The diameters are in the ratio 4 : 1. Densities of the materials are in the ratio 1 : 2. If the lower frequency in the setting is 360 Hz. the beat frequency when the two wires are sounded together is :

(1) 5

(2) 8

(3) 6

(4) 10

Concept Questions :-

Travelling wave on string
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The first overtone of a stretched wire of given length is 320 Hz. The first harmonic is :

(1) 320 Hz

(2) 160 Hz

(3) 480 Hz

(4) 640 Hz

Concept Questions :-

Standing waves
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The sound carried by the air from a sitar to a listener is a wave of the following type :

(1) Longitudinal stationery

(2) Transverse progressive

(3) Transverse stationery

(4) Longitudinal progressive

Concept Questions :-

Wave motion
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Three similar wires of frequency n1, n2 and n3 are joined to make one wire. Its frequency will be :

(1) $n={n}_{1}+{n}_{2}+{n}_{3}$

(2) $\frac{1}{n}=\frac{1}{{n}_{1}}+\frac{1}{{n}_{2}}+\frac{1}{{n}_{3}}$

(3) $\frac{1}{\sqrt{n}}=\frac{1}{\sqrt{{n}_{1}}}+\frac{1}{\sqrt{{n}_{2}}}+\frac{1}{\sqrt{{n}_{3}}}$

(4) $\frac{1}{{n}^{1}}=\frac{1}{{n}_{1}^{2}}+\frac{1}{{n}_{2}^{2}}+\frac{1}{{n}_{3}^{2}}$

Concept Questions :-

Travelling wave on string
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Two vibrating strings of the same material but lengths L and 2L have radii 2r and r respectively. They are stretched under the same tension. Both the strings vibrate in their fundamental modes, the one of length L with frequency n1 and the other with frequency n2. The ratio n1/n2 is given by :

(1) 2

(2) 4

(3) 8

(4) 1

Concept Questions :-

Travelling wave on string
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

A string is rigidly tied at two ends and its equation of vibration is given by Then minimum length of the string is :

1. 1 m

2. $\frac{1}{2}m$

3. 5 m

4. 2π m

Concept Questions :-

Wave motion