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Waves MCQs for NEET — Physics Questions with Answers

Practice free Waves (Physics) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.

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The velocity of sound measured in hydrogen and oxygen gas at a given temperature will be in the ratio :

1 : 4

4 : 1

2 : 1

1 : 1

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Explanation

$v \propto \frac{1}{\sqrt{M}} \Rightarrow \frac{v_{H_{2}}}{v_{O_{2}}} = \sqrt{\frac{M_{O_{2}}}{M_{H_{2}}}} = \sqrt{\frac{32}{2}} \Rightarrow \frac{v_{H_{2}}}{v_{O_{2}}} = \frac{4}{1}$

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If v_m is the velocity of sound in moist air, v_d is the velocity of sound in dry air, under identical conditions of pressure and temperature

v_m > v_d

v_m < v_d

v_m = v_d

v_mv_d = 1

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Explanation

The density of moist air (i.e. air mixed with water vapours) is less than the density of dry air

Hence from $v = \sqrt{\frac{γ P}{ρ}}$ ⇒ $v_{m o i s t a i r} > v_{d r y a i r}$ .

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A source of the sound of frequency 600 Hz is placed inside water. The speed of sound in water is 1500 m/s and in the air is 300 m/s. The frequency of sound recorded by an observer who is standing in the air is :

200 Hz

3000 Hz

120 Hz

600 Hz

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Explanation

Frequency of sound does not change with medium, because it is characteristics of source.

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An underwater sonar source operating at a frequency of 60 kHz directs its beam towards the surface. If the velocity of sound in air is 330 m/s, the wavelength and frequency of waves in air are:

5.5 mm, 60 kHz

330 m, 60 kHz

5.5 mm, 20 kHz

5.5 mm, 80 kHz

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Explanation

Frequency of waves remains same, i.e. 60 Hz

and wavelength $ λ = \frac{v}{n} = \frac{330}{60 \times 10^{3}}$ = 5.5 mm.

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It is possible to distinguish between the transverse and longitudinal waves by studying the property of :

Interference

Diffraction

Reflection

Polarisation

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Explanation

Interference, diffraction and reflection occurs in both transverse and longitudinal waves. Polarisation occurs only in transverse waves.

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Water waves are

Longitudinal

Transverse

Both longitudinal and transverse

Neither longitudinal nor transverse

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Explanation

Water waves are transverse as well as longitudinal in nature.

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The waves in which the particles of the medium vibrate in a direction perpendicular to the direction of wave motion is known as

Transverse wave

Longitudinal waves

Propagated waves

None of these

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Explanation

In transverse waves medium particles vibrate perpendicular to the direction of propagation of wave.

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What is the phase difference between two successive crests in the wave?

π/2

2π

4π

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Explanation

Since distance between two consecutive crests is λ, so

$ϕ = \frac{2 π}{λ} \times λ = 2 π .$

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A wave of the frequency of 500 Hz has a velocity of 360 m/sec. The distance between two nearest points 60° out of phase, is :

0.6 cm

12 cm

60 cm

120 cm

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Explanation

The distance between two points i.e. path difference between them $Δ = \frac{λ}{2 π} \times ϕ = \frac{λ}{2 π} \times \frac{π}{3} = \frac{λ}{6} = \frac{v}{6 n}$ $(∵ v = n λ)$

⇒ $Δ = \frac{360}{6 \times 500} = 0 .12 m = 12 c m$

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Sound waves of wavelength greater than that of audible sound are called :

Seismic waves

Sonic waves

Ultrasonic waves

Infrasonic waves

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Explanation

Infrasonic waves have frequency less than (20 Hz) audible sound and wavelength more than audible sound.

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