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Sound Test - 41

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Sound Test - 41
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  • Question 1
    1 / -0
    Rahul is playing the drums. Then which of the following characteristics of sound would result in increase in loudness?
    Solution
    Answer is A.

    The intensity or loudness of a sound depends upon the extent to which the sounding body vibrates, i.e., the amplitude of vibration. A sound is louder as the amplitude of vibration is greater. Loudness is measured in units called decibels.
  • Question 2
    1 / -0
    Three small interlocking bones: the hammer, the anvil, and the stirrup transmit the vibrations of the eardrum to the inner ear.
    Solution
    The malleus, or hammer, the incus, or anvil, and the stapes, or stirrup together form a short chain that crosses the middle ear and transmits vibrations caused by sound waves from the eardrum membrane to the liquid of the inner ear. 
    Hence, the statement is true.
  • Question 3
    1 / -0
    Choose the correct answer.
    Sound can travel through

    Solution
    Answer is D.

    Sound is a form of energy produced and transmitted by vibrating matter. Sound travels in waves. When sound moves through matter (solid, liquid, or a gas), the molecules of the matter move backward and forward in the direction in which the wave is traveling. This movement is called a vibration. Sound travels more quickly through solids than through liquids and gases because the molecules of a solid are closer together. Sound travels the lowest through gases because the molecules of a gas are farthest apart. In a vacuum sound cannot travel because there is no matter for it to move through.
    Hence, sounds can travel in solids, liquids and gases.
  • Question 4
    1 / -0
    Which of the following statements is correct?
    Solution
    The answer is B.

    Amplitude is the maximum distance covered by an oscillating body. To complete one oscillation, the body has to start from the mean position, then goes to the maximum distance on one side, then comes back to the mean position, then goes to the maximum position on the other side, and finally comes back to the mean position.
    If $$A$$ is the amplitude of the oscillation then the total distance covered by the body in one complete oscillation is $$4A$$,

  • Question 5
    1 / -0
    The maximum distance that a particle moves away from its rest position is called ________________.
    Solution
    The maximum amount that a particle moves away from its rest position is called amplitude.
    Amplitude is the maximum displacement or distance moved by a point on a vibrating body or wave measured from its equilibrium position. It is equal to one-half the length of the vibration path. 
    For a transverse wave, such as the wave on a plucked string, amplitude is measured by the maximum displacement of any point on the string from its position when the string is at rest. For a longitudinal wave, such as a sound wave, amplitude is measured by the maximum displacement of a particle from its position of equilibrium. 
  • Question 6
    1 / -0
    Science fiction films often show battles between spaceships. Four friends were arguing what would someone in space hear if an enemy spaceship exploded?
    Rekha said, 'they would hear a big explosion.'
    Renu saud,'they will not hear anything as there is no medium for sound to travel, but they can see the explosion.'
    Ramesh said, 'yes, they will not hear anything and they will not be able to see the explosion.'
    Raghav said,'the explosion produces sound of frequency above 20,000 Hz hence we cannot hear it.' 
    Who is correct?
    Solution
    Answer is B.

    Sound needs something to travel through to get from one place to another. In the space, since there is no air, sound cannot travel above the surface. So, there are no sounds in the space. 
    The space has no air because its gravity is too weak to hold an atmosphere. Hence, if an enemy spaceship exploded 'they will not hear anything as there is no medium for sound to travel, but they can see the explosion because light can travel through space as light needs no medium to travel.
    Renu is correct.
  • Question 7
    1 / -0
    A _________________ wave has oscillations in the same direction as its motion.
    Solution
    A longitudinal wave has oscillations in the same direction as its motion.
    Longitudinal waves, also known as l-waves, are waves in which the displacement of the medium is in the same direction as the direction of travel of the wave. Longitudinal waves are also called compressional waves or compression waves, because they produce compression and rarefaction when traveling through a medium.  In longitudinal waves, the displacement of the medium is parallel to the propagation of the wave. 
  • Question 8
    1 / -0
    Arrange the materials in the decreasing order of the speed with which sound will travel through them: 
    Metal rod, Air, Water
    Solution
    Answer is C.

    Sound travels fastest in solids and slowest in air. Water is in between. This is because the particles in solids are closer together than the particles in liquids or gases, and the particles in liquids are closer together than the particles in gases. The tighter particles are packed in a space, they collide more frequently. This allows sound, which is simply the combined collisions of particles, to travel fastest in solids. So, to reiterate, sound travels fastest in solids, then water, and slowest in air.
    Hence, the speed of sound is maximum in the Metal rod, next in water and the least in air.
  • Question 9
    1 / -0
    The sound from a mosquito is produced when it vibrates its wings at an average rate of $$500$$ vibrations per second. What is the time period of the vibration?
    Solution

    Hint: The time period is the inverse of the frequency.

    Step – 1: Get relationship between frequency and time period

    The time period is shown as,

    So, $$time\ period = \dfrac{1}{frequency}$$

    Step – 2: Put value in the equation 

    Here, mosquito generates average rate of 500 vibrations per second. So, frequency will be 500.

    $$time\ period = \dfrac{1}{frequency}$$

    $$= \dfrac{1}{500}$$

     $$= 0.002\ second$$

    $$Answer:$$

    Hence, option A is the correct answer.

  • Question 10
    1 / -0
    Convert the frequency $$1.492 \ Hz$$ to time period.
    Solution
    Frequency is inverse of the time period , 
    $$f=\dfrac1T$$

    Given, $$f=1.492 \ Hz$$

    Hence, time period $$T= \dfrac1f=\dfrac{1}{1.492}=0.67 \ s$$

    Hence, answer is A.
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