Physics Of Sound Post-test Troncoso

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Physics Of Sound Post-test Troncoso - Quiz

Third grade FOSS physics of sound pretest


Questions and Answers
  • 1. 

    Being able to tell different sounds apart is called

    • A.

      Sound amplification

    • B.

      Sound discrimination

    • C.

      Vibration

    • D.

      Frequency

    Correct Answer
    B. Sound discrimination
    Explanation
    Sound discrimination refers to the ability to differentiate between different sounds. It involves the perception and recognition of various auditory stimuli, such as pitch, tone, and rhythm. This cognitive process allows individuals to distinguish between different sounds and understand their meaning or significance. Sound amplification refers to the process of increasing the volume or intensity of sound. Vibration refers to the rapid back-and-forth movement of an object or medium, often producing sound. Frequency is a measure of the number of sound waves or vibrations per second, determining the pitch of a sound.

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  • 2. 

    When you make sounds by plucking a rubber band, you make the rubber band move back and forth very quickly.  This movement is called

    • A.

      Loudness

    • B.

      Amplitude

    • C.

      Pitch

    • D.

      Vibration

    Correct Answer
    D. Vibration
    Explanation
    When you pluck a rubber band, it starts to move rapidly back and forth. This rapid back and forth motion is known as vibration. The rubber band vibrates, creating sound waves that travel through the air and reach our ears. The other options - loudness, amplitude, and pitch - are not correct because they do not accurately describe the movement of the rubber band when it is plucked.

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  • 3. 

    THe highness or lowness of a sound is the

    • A.

      Pitch

    • B.

      Loudness

    • C.

      Vibration

    • D.

      Resonance

    Correct Answer
    A. Pitch
    Explanation
    Pitch refers to the highness or lowness of a sound. It is determined by the frequency of the sound waves, with higher frequencies producing higher pitched sounds and lower frequencies producing lower pitched sounds. Pitch is a subjective perception and can be influenced by factors such as the size and shape of the sound source, as well as the characteristics of the human ear. Loudness, on the other hand, refers to the intensity or volume of a sound. Vibration and resonance are related concepts but do not directly refer to the highness or lowness of a sound.

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  • 4. 

    If you tighten a string and keep plucking it with your finger as you pull, what happens to the pitch?

    • A.

      As you tighten the string, the pitch gets lower

    • B.

      The pitch stays the same

    • C.

      As you tighten the string, the pitch gets higher

    • D.

      You can't tell unless you try it

    Correct Answer
    C. As you tighten the string, the pitch gets higher
    Explanation
    When you tighten a string, you increase its tension. As the tension increases, the string becomes stiffer and vibrates at a higher frequency. Higher frequency vibrations produce higher-pitched sounds, so the pitch gets higher as you tighten the string.

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  • 5. 

    The loudness of a sound is called

    • A.

      The sound wave

    • B.

      The volume

    • C.

      The amplitude

    • D.

      The pitch

    Correct Answer
    B. The volume
    Explanation
    The correct answer is "the volume". The loudness of a sound refers to the perception of its intensity or strength. This perception is commonly referred to as the volume of the sound. The volume of a sound is determined by the amplitude of the sound wave, which represents the maximum displacement of particles in a medium caused by the sound. Therefore, the volume is a measure of how loud or soft a sound is.

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  • 6. 

    A student holds two vibrating objects.  Object A is vibrating faster than object B.  Which statement is true?

    • A.

      A is louder than B

    • B.

      B is louder than A

    • C.

      A will have a higher pitch than B

    • D.

      B will have a higher pitch than A

    Correct Answer
    C. A will have a higher pitch than B
    Explanation
    When an object vibrates faster, it means that it completes more vibrations in a given amount of time. This results in a higher frequency of vibrations, which is directly related to the pitch of the sound produced. Therefore, if object A is vibrating faster than object B, it means that object A will have a higher pitch than object B.

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  • 7. 

    The same sound will seem louder if it travels through which of the following?

    • A.

      Solid objects

    • B.

      Liquids

    • C.

      Air

    • D.

      Solids, liquids and gases will sound the same

    Correct Answer
    A. Solid objects
    Explanation
    When sound travels through solid objects, it tends to propagate more efficiently compared to liquids or air. This is because solids have a higher density and a more tightly packed molecular structure, allowing sound waves to travel faster and with less loss of energy. Thus, when sound travels through solid objects, it will seem louder due to the efficient transmission of sound waves.

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  • 8. 

    If you roll a large sheet of paper into a funnel, you can hear the sound better.  This process of increasing the loudness of a sound is called

    • A.

      Measuring a wave

    • B.

      Absorption

    • C.

      Reflection

    • D.

      Amplification

    Correct Answer
    D. Amplification
    Explanation
    When a large sheet of paper is rolled into a funnel shape, it creates a larger surface area for the sound waves to interact with. This causes the sound waves to bounce off the funnel walls and concentrate towards the narrow opening, resulting in an increase in the loudness of the sound. This process of increasing the loudness of a sound is called amplification.

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  • 9. 

    Which of the following would produce the hightest pitch?

    • A.

      Phone

    • B.

      Whistle

    • C.

      Truck horn

    • D.

      Dog's growl

    Correct Answer
    B. Whistle
    Explanation
    A whistle would produce the highest pitch among the given options. This is because a whistle typically produces a sound with a high frequency, resulting in a higher pitch. On the other hand, a phone, truck horn, and dog's growl produce sounds with lower frequencies, resulting in lower pitches.

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  • 10. 

    Which of the following would produce the loudest sound?

    • A.

      Jet plane

    • B.

      Pin falling

    • C.

      Doorbell

    • D.

      Whisper

    Correct Answer
    A. Jet plane
    Explanation
    A jet plane would produce the loudest sound among the given options. Jet planes are known for their powerful engines and high speeds, which generate intense noise levels. The sound produced by a jet plane can reach up to 140 decibels, which is equivalent to a gunshot or a rock concert. In comparison, a pin falling, doorbell, and whisper would produce much softer and quieter sounds.

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  • 11. 

    A unit for measuring the loudness of sounds is

    • A.

      Vibration

    • B.

      Decibel

    • C.

      Frequency

    • D.

      Pitch

    Correct Answer
    B. Decibel
    Explanation
    The correct answer is decibel. The decibel is a unit used to measure the loudness of sounds. It is a logarithmic scale that compares the intensity of a sound to a reference level. The higher the decibel level, the louder the sound. Other options such as vibration, frequency, and pitch are not units used specifically for measuring the loudness of sounds.

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  • 12. 

    A process for locating distant or invisible objects by using sound waves that are reflected back to the sender

    • A.

      Vibration

    • B.

      Receiver

    • C.

      Echolocation

    • D.

      Source

    Correct Answer
    C. Echolocation
    Explanation
    Echolocation is a process that involves using sound waves to locate objects that are far away or not visible. The sound waves are emitted by a source and then reflected back to a receiver. By analyzing the time it takes for the sound waves to return, the distance and location of the objects can be determined. This technique is commonly used by animals such as bats and dolphins to navigate and find prey in their environment.

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  • 13. 

    The speed at which something vibrates is called

    • A.

      Pitch

    • B.

      Amplitude

    • C.

      Resonance

    • D.

      Frequency

    Correct Answer
    D. Frequency
    Explanation
    Frequency refers to the number of cycles or vibrations occurring in a given time period. It is a measure of how quickly something vibrates. Pitch refers to the perceived frequency of a sound, amplitude refers to the magnitude or intensity of a vibration, and resonance refers to the reinforcement or amplification of vibrations. Therefore, frequency is the correct answer as it directly relates to the speed at which something vibrates.

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  • 14. 

    Something that detects sound is a

    • A.

      Sound wave

    • B.

      Volume

    • C.

      Amplitude

    • D.

      Sound receiver

    Correct Answer
    D. Sound receiver
    Explanation
    A sound receiver is something that detects sound. It is designed to receive and capture sound waves, allowing us to hear and interpret them. This can include devices such as microphones, speakers, or even our own ears. By receiving sound waves, a sound receiver converts them into electrical signals or vibrations that can be processed and perceived as sound.

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  • 15. 

    An object or material that vibrates in a way that makes sound is called the

    • A.

      Sound source

    • B.

      Receiver

    • C.

      Sound wave

    • D.

      Pitch

    Correct Answer
    A. Sound source
    Explanation
    An object or material that vibrates in a way that makes sound is called the sound source. This is because a sound source is responsible for producing the vibrations that create sound waves. These vibrations can be caused by various factors such as the movement of air molecules or the striking of an object. Therefore, the sound source is the origin or starting point of the sound waves that travel through the air or other mediums to be heard by a receiver.

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