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Physics MCQs for NEET — Practice Questions with Answers

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The type of waves that can be propagated through solid is :

Transverse

Longitudinal

Both (1) and (2)

None of these

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Explanation

Since solid has both the properties (rigidity and elasticity).

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Velocity of sound in air

I. Increases with temperature

II. Decreases with temperature

III. Increase with pressure

IV. Is independent of pressure

V. Is independent of temperature

Choose the correct answer. [Kerala (Engg.) 2001]

Only I and II are true

Only I and III are true

Only II and III are true

Only I and IV are true

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Explanation

Speed of sound $v \propto \sqrt{T}$ and it is independent of pressure.

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If at same temperature and pressure, the densities for two diatomic gases are respectively d₁ and d₂, then the ratio of velocities of sound in these gases will be :

$\sqrt{\frac{d_{2}}{d_{1}}}$

$\sqrt{\frac{d_{1}}{d_{2}}}$

d₁d₂

$\sqrt{d_{1} d_{2}}$

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Explanation

Speed of sound $v = \sqrt{\frac{γ P}{d}}$ ⇒ $\frac{v_{1}}{v_{2}} = \sqrt{\frac{d_{2}}{d_{1}}}$ (âˆµ P - constant)

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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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