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Sound Test - 71...

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  • Question 1
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    Statement 1: Loudness is the characteristic of a musical sound by which a loud sound can be distinguished from a faint sound.
    Statement 2: Echo is always produced when sound is incident on the hard and polished surface.

  • Question 2
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    An echo is heard, if ____________ between the source and the reflector is atleast $$17\ m$$

  • Question 3
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    Two identical sounds A and B reach a point in the same phase. The resultant sound is C. The loudness of C is n dB higher than the loudness of A. The value of n is?

  • Question 4
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    Directions For Questions

    Ultrasonic and Infrasonic Waves: The sound having frequency between $$20$$ Hz to $$20$$ kHz is called audible sound. Human ear cannot hear sound of frequencies lying outside this range. The limits of audibility of sound vary from individual. Generally the upper limit decreases with increase of age of individual; usually and people can not hear sound of frequency more than $$15$$ kHz.
    Sound of frequencies below $$20$$ Hz are called infrasonics, while frequencies beyond $$20$$ kHz are called ultrasonics. Ultrasonics can be heard by dogs, cat, bats, etc. Bats detect the path by means of ultrasonics. Ultrasonics can be used for diagnosis of turnover and other abnormalities within our body. This is known as ultrasonography. Ultrasonics are used to cure various diseases and to measure depth of oceans to detect submarines.

    ...view full instructions

    The waves produced by simple pendulum (having time period $$2$$ seconds) are.

  • Question 5
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    Transverse waves can propagate

  • Question 6
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    If the velocity of sound in a gas is 360 m/s and the distance between compression and the nearest rarefraction is 1m, then the frequency of sound is 

  • Question 7
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    A man standing on a cliff claps his hand and hears its echo after 1 sec.If the sound is reflected from another mountain then the distance between the man and the reflection points is  V$$_{sound}$$ = 340m /  sec.

  • Question 8
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    The nature of sound waves in gases is

  • Question 9
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    A girl claps in front of a wall and wind blows from the girl towards the wall at the speed of $$20 \ m/s$$. If she is standing at a distance of $$50 \ m$$ from the wall, then she will hear the echo of sound of claps approximately after [Speed of sound in still air = $$330 \ m/s$$]

  • Question 10
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    Some whistles are designed to produce waves that can attract the attention of dogs but humans do not notice these waves. What kind of waves are these?

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