A person carrying a whistle emitting continuously a note of 272 Hz is running towards a reflecting surface with a speed of 18 km/hour. The speed of sound in air is 345 ms–1. The number of beats heard by him is

(1) 4

(2) 6

(3) 8

(4) 3

Concept Questions :-

Beats
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

If the pressure amplitude in a sound wave is tripled, then the intensity of sound is increased by a factor of

(1) 9

(2) 3

(3) 6

(4) $\sqrt{3}$

Concept Questions :-

Energy of waves
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

If the amplitude of the sound is doubled and the frequency reduced to one-fourth, the intensity of sound at the same point will be :

(1) Increased by a factor of 2

(2) Decreased by a factor of 2

(3) Decreased by a factor of 4

(4) Unchanged

Concept Questions :-

Energy of waves
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Intensity level of a sound of intensity I is 30 dB. The ratio $\frac{I}{{I}_{0}}$ is (Where I0 is the threshold of hearing)

(1) 3000

(2) 1000

(3) 300

(4) 30

Concept Questions :-

pressure wave in sound
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Quality of a musical note depends on :

(1) Harmonics present

(2) The amplitude of the wave

(3) Fundamental frequency

(4) The velocity of sound in the medium

Concept Questions :-

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

Difficulty Level:

If T is the reverberation time of an auditorium of volume V then :

(1) $T\propto \frac{1}{V}$

(2) $T\propto \frac{1}{{V}^{2}}$

(3) $T\propto {V}^{2}$

(4) $T\propto V$

Concept Questions :-

pressure wave in sound
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The intensity level due to two waves of the same frequency in a given medium are 1 bel and 5 bel. Then the ratio of amplitudes is :

(1) 1 : 4

(2) 1 : 2

(3) 1 : 104

(4) 1 : 102

Concept Questions :-

pressure wave in sound
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Of the following the one which emits the sound of a higher pitch is :

(1) Mosquito

(2) Lion

(3) Man

(4) Woman

Concept Questions :-

pressure wave in sound
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

A point source emits sound equally in all directions in a non-absorbing medium. Two points P and Q are at distances of 2m and 3m respectively from the source. The ratio of the intensities of the waves at P and Q is :

(1) 9 : 4

(2) 2 : 3

(3) 3 : 2

(4) 4 : 9

Concept Questions :-

Energy of waves
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Two waves having sinusoidal waveforms have different wavelengths and different amplitudes. They will be having :

(1) Same pitch and different intensity

(2) Same quality and different intensity

(3) Different quality and different intensity

(4) Same quality and different pitch

Concept Questions :-

pressure wave in sound