# Given below are two statements:  Assertion (A): Ocean waves hitting a beach are always found to be nearly normal to the shore. Reason (R): Ocean waves are longitudinal waves.   1. Both (A) and (R) are True and (R) is the correct explanation of (A). 2. Both (A) and (R) are True but (R) is not the correct explanation of (A). 3. (A) is True but (R) is False. 4. Both (A) and (R) are False.

Subtopic:  Types of Waves |
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Given below are two statements:
 Assertion (A): Where two vibrating tuning forks having frequencies 256 Hz and 512 Hz are held near each other, beats cannot be heard. Reason (R): The principle of superposition is valid only if the frequencies of the oscillators are nearly equal.

 1 Both (A) and (R) are True and (R) is the correct explanation of (A). 2 Both (A) and (R) are True but (R) is not the correct explanation of (A). 3 (A) is True but (R) is False. 4 Both (A) and (R) are False.
Subtopic:  Beats |
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Given below are two statements:

 Statement I: Sound waves travelling from air into water, incident obliquely, bend towards the normal. Statement II: Sound waves travel more slowly in water than in air.

 1 Statement I is incorrect and Statement II is correct. 2 Both Statement I and Statement II are correct. 3 Both Statement I and Statement II are incorrect. 4 Statement I is correct and Statement II is incorrect.
Subtopic:  Speed of Sound |
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A tuning fork makes $$256$$ vibrations per second in air. When the velocity of sound is $$330$$ m/s, then the wavelength of the tone emitted is:
1. $$0.56$$ m
2. $$0.89$$ m
3. $$1.11$$ m
4. $$1.29$$ m
Subtopic:  Wave Motion |
85%
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Given below are two statements:
 Statement I: The speed of sound waves in a medium depends on the elastic modulus and the density of the medium. Statement II: The speed of sound in a gas is independent of its temperature.

 1 Statement I is incorrect and Statement II is correct. 2 Both Statement I and Statement II are correct. 3 Both Statement I and Statement II are incorrect. 4 Statement I is correct and Statement II is incorrect.
Subtopic:  Speed of Sound |
69%
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A transverse wave is represented by $$y = 2 sin ( \omega t - kx)$$cm. The value of wavelength (in cm) for which the wave velocity becomes equal to the maximum particle velocity, will be:
1. $$4 \pi$$
2. $$2 \pi$$
3. $$\pi$$
4. $$2$$
Subtopic:  Wave Motion |
82%
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A set of $$20$$ tuning forks is arranged in a series of increasing frequencies. If each fork gives $$4$$ beats with respect to the preceding fork and the frequency of the last fork is twice the frequency of the first, then the frequency of the last fork is:
1. $$152$$ Hz
2. $$234$$ Hz
3. $$134$$ Hz
4. $$144$$ Hz
Subtopic:  Beats |
79%
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Three progressive waves $$A,$$ $$B$$ and $$C$$ are shown below. With respect to wave $$A,$$

 1 wave $$C$$ lags behind in phase by $$\pi/2$$ and wave $$B$$ leads by $$\pi/2$$. 2 wave $$C$$ leads in phase by $$\pi$$ and wave $$B$$ lags behind by $$\pi$$. 3 wave $$C$$ lags behind in phase by $$\pi/2$$ and wave $$B$$ leads behind by $$\pi$$. 4 wave $$C$$ lags behind in phase by $$\pi$$ and wave $$B$$ leads by $$\pi$$.
Subtopic:  Wave Motion |
80%
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Given below are two statements:
 Assertion (A): The change in air pressure affects the speed of sound. Reason (R): The speed of sound in gases is proportional to the square of pressure.

 1 Both (A) and (R) are True and (R) is the correct explanation of (A). 2 Both (A) and (R) are True but (R) is not the correct explanation of (A). 3 (A) is True but (R) is False. 4 Both (A) and (R) are False.
Subtopic:  Speed of Sound |
57%
From NCERT