Chapter 3 Ultrasound Physics

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Chapter 3 Ultrasound Physics - Quiz

Ultrasound physics quiz chapter 3


Questions and Answers
  • 1. 

    What is the typical value for period?

    • A.

      0.1-0.5 microseconds

    • B.

      0.1-0.5 seconds

    • C.

      0.1-0.5 microhetz

    • D.

      0.2-1 cm

    Correct Answer(s)
    A. 0.1-0.5 microseconds
    B. 0.1-0.5 seconds
    Explanation
    The typical value for period is usually measured in seconds or fractions of a second. In this case, the options of 0.1-0.5 microseconds and 0.1-0.5 seconds are the most appropriate choices. Microseconds are a unit of time equal to one millionth of a second, while seconds are the standard unit of time. Therefore, the correct answer is 0.1-0.5 microseconds and 0.1-0.5 seconds.

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  • 2. 

    Concentration of the energy of a sound beam

    • A.

      Intensity

    • B.

      Amplitude

    • C.

      Frequency

    • D.

      Power

    • E.

      Period

    Correct Answer
    A. Intensity
    Explanation
    Intensity is the correct answer because it refers to the concentration of the energy of a sound beam. Intensity is defined as the amount of energy that passes through a unit area perpendicular to the direction of wave propagation per unit time. It is directly related to the amplitude of the sound wave and represents the strength or loudness of the sound. Therefore, intensity is a measure of how concentrated the energy of a sound beam is.

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  • 3. 

    The distance that a sound wave travel through a medium in a second

    • A.

      Amplitude

    • B.

      Speed

    • C.

      Power

    • D.

      Intensity

    • E.

      Density

    Correct Answer
    B. Speed
    Explanation
    Speed is the correct answer because it refers to the distance that a sound wave can travel through a medium in a given amount of time. It is a measure of how fast the sound wave is moving and is typically measured in meters per second. Amplitude, power, intensity, and density are all properties of sound waves, but they do not specifically refer to the distance traveled by the wave in a second.

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  • 4. 

    Number of particular eventts that occur in a specific duration of time

    • A.

      Power

    • B.

      Wavelength

    • C.

      Frequency

    • D.

      Amplitude

    • E.

      Intensity

    Correct Answer
    C. Frequency
    Explanation
    Frequency refers to the number of particular events that occur in a specific duration of time. It is a measure of how often a specific event or phenomenon repeats within a given time period. In the context of the options provided, power, wavelength, amplitude, and intensity do not directly relate to the number of events occurring in a specific time duration. Therefore, the correct answer is frequency.

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  • 5. 

    What is the unit for period?

    • A.

      Hertz

    • B.

      Cm

    • C.

      Seconds

    • D.

      Pascals

    Correct Answer
    C. Seconds
    Explanation
    The unit for period is seconds. The period is the time it takes for one complete cycle of a repeating event or wave to occur. It is measured in seconds because it represents the time interval. Hertz is the unit for frequency, not period. Centimeters and pascals are units used for measuring length and pressure respectively, and are not relevant to the measurement of period.

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  • 6. 

    Period is determined by

    • A.

      Sound source

    • B.

      Medium

    • C.

      Both

    Correct Answer
    A. Sound source
    Explanation
    The period of a sound wave is determined by the sound source. The period is the time it takes for one complete cycle of the wave to occur. The sound source, such as a vibrating object or instrument, determines the frequency of the wave, which in turn determines the period. Different sound sources produce waves with different frequencies, resulting in different periods. Therefore, the sound source plays a crucial role in determining the period of a sound wave.

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  • 7. 

    The time it takes a wave to vibrate a single cycle, or time from the start of a cycle to the start of the next cycle

    • A.

      Period

    • B.

      Frequency

    • C.

      Wavelength

    • D.

      Speed

    • E.

      Power

    Correct Answer
    A. Period
    Explanation
    The correct answer is "Period". The period of a wave refers to the time it takes for a wave to complete one full cycle. It is the time interval between the start of a cycle and the start of the next cycle. In other words, it is the duration of one complete vibration or oscillation of a wave. The period is typically measured in seconds and is inversely related to the frequency of the wave.

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  • 8. 

    Whats is the unit for frequency

    • A.

      Pascals

    • B.

      Miles

    • C.

      Seconds

    • D.

      Hertz

    Correct Answer
    D. Hertz
    Explanation
    The unit for frequency is hertz. Hertz is a measure of the number of cycles or oscillations of a wave that occur in one second. It is commonly used to measure the frequency of sound waves, radio waves, and other types of waves.

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  • 9. 

    What is the typical value for frequency?

    • A.

      10MHz-20MHz

    • B.

      2 million - 10 million cm

    • C.

      2 million to 10 million secons

    • D.

      2Hz-10Hz

    • E.

      2MHz-10Mhz

    Correct Answer
    E. 2MHz-10Mhz
    Explanation
    The typical value for frequency is usually measured in megahertz (MHz) or hertz (Hz). In this case, the given answer range of 2MHz-10MHz falls within the typical frequency range. This range is commonly used in various electronic devices and communication systems, such as radios, televisions, and computer processors. It represents a moderate frequency range that allows for efficient data transmission and processing without excessive interference or power consumption.

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  • 10. 

    What is the relationship between frequency and resolution

    • A.

      Direct

    • B.

      Inverse

    • C.

      None

    Correct Answer
    A. Direct
    Explanation
    Frequency and resolution have a direct relationship. As the frequency increases, the resolution also increases. This means that higher frequencies provide more detail and accuracy in the measurement or representation of a signal or phenomenon. Conversely, lower frequencies result in lower resolution, meaning less detail and accuracy. Therefore, frequency and resolution are directly proportional to each other.

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  • 11. 

    Frequency is determined by?

    • A.

      Sound source

    • B.

      Medium

    • C.

      Both

    Correct Answer
    A. Sound source
    Explanation
    The frequency of a sound wave is determined by the sound source. The sound source, such as a musical instrument or a person's voice, produces vibrations that create the sound waves. These vibrations determine the frequency, which refers to the number of cycles or vibrations per second. The medium through which the sound travels may affect the speed and intensity of the sound, but it does not determine the frequency. Therefore, the correct answer is sound source.

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  • 12. 

    Is frequency adjustable?

    • A.

      Yes

    • B.

      No

    Correct Answer
    B. No
    Explanation
    The given question asks if the frequency is adjustable. The correct answer is "No." This means that the frequency is not adjustable.

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  • 13. 

    What is the typical value of amplitude

    • A.

      Distance, density, cm

    • B.

      Pressure, distance, pascals

    • C.

      Density, pressure, volume

    • D.

      Pressure, density, distance

    Correct Answer
    D. Pressure, density, distance
    Explanation
    The typical value of amplitude is not mentioned in the question or answer choices. Therefore, an explanation cannot be provided.

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  • 14. 

    Is period adjustable?

    • A.

      Yes

    • B.

      No

    Correct Answer
    B. No
    Explanation
    The question asks whether the period is adjustable or not. The answer "No" indicates that the period is not adjustable.

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  • 15. 

    The lower the frequency the lower the pentration

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    This statement is false. The frequency of a wave refers to the number of complete cycles of the wave that occur in one second. It does not determine the penetration ability of the wave. The penetration ability of a wave is determined by its wavelength. Generally, waves with higher frequencies have shorter wavelengths and are able to penetrate materials more effectively. Therefore, the lower the frequency, the higher the penetration ability of the wave.

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  • 16. 

    What is the relationship between period and frequency

    • A.

      Direct

    • B.

      Inverse

    • C.

      None

    • D.

      Reciprocal

    Correct Answer
    D. Reciprocal
    Explanation
    The relationship between period and frequency is reciprocal. This means that as the period increases, the frequency decreases, and vice versa. The period is the time it takes for one complete cycle to occur, while the frequency is the number of cycles that occur in one second. Since frequency is the reciprocal of the period, an increase in one will result in a decrease in the other, and vice versa.

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  • 17. 

    Amplitude is determined by

    • A.

      Sound source

    • B.

      Medium

    • C.

      Both

    Correct Answer
    A. Sound source
    Explanation
    The amplitude of a sound wave refers to the maximum displacement of particles in the medium from their equilibrium position. It is determined by the sound source, specifically the energy or force with which it creates the sound wave. The medium through which the sound travels does not affect the amplitude directly, but it can influence the propagation and transmission of the sound wave. Therefore, the correct answer is the sound source.

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  • 18. 

    Audible sound

    • A.

      20kHz

    • B.

      20Hz-20kHz

    • C.

      20,000 Hz

    • D.

      >20Hz

    Correct Answer
    B. 20Hz-20kHz
    Explanation
    The given answer, 20Hz-20kHz, represents the frequency range of audible sound. Audible sound refers to the range of sound frequencies that can be heard by the human ear. The lower limit of this range is around 20Hz, which is the lowest frequency that most people can perceive as sound. The upper limit is approximately 20kHz, which is the highest frequency that the average human ear can detect. Therefore, any sound within the range of 20Hz-20kHz is considered audible to the human ear.

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  • 19. 

    As resolution increase frequency increases

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    As the resolution of an image increases, the number of pixels per unit area increases. This means that more details can be captured in the image, resulting in a higher level of clarity. As a result, the frequency of the image also increases, as there are more distinct details and patterns present. Therefore, the statement "As resolution increases, frequency increases" is true.

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  • 20. 

    Is amplitude adjustable?

    • A.

      Yes

    • B.

      No

    Correct Answer
    A. Yes
    Explanation
    The given question asks whether the amplitude is adjustable or not. The correct answer is "Yes" because amplitude refers to the maximum displacement or distance from the equilibrium position in a wave or oscillation. In many cases, the amplitude can be adjusted or changed, either manually or through external factors, to increase or decrease the intensity or strength of the wave or oscillation.

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  • 21. 

    What is the unit of power?

    • A.

      Joules

    • B.

      Seconds

    • C.

      Watts

    • D.

      Cm

    Correct Answer
    C. Watts
    Explanation
    The unit of power is watts. Power is defined as the rate at which work is done or energy is transferred. It is calculated by dividing the amount of work or energy by the time taken. Watts is the standard unit for measuring power, named after the Scottish engineer James Watt. It is equivalent to one joule of work or energy per second.

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  • 22. 

    What is the typical value of intensity

    • A.

      0.01 to 30 W/cm3

    • B.

      0.001 to 300 W/cm3

    • C.

      10 to 300 W/cm3

    • D.

      0.01 to 300 W/cm3

    Correct Answer
    D. 0.01 to 300 W/cm3
    Explanation
    The typical value of intensity can range from 0.01 to 300 W/cm3. This means that in most cases, the intensity of a given phenomenon or measurement falls within this range. It is important to note that this is a generalization and there may be instances where the intensity exceeds or falls below this range.

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  • 23. 

    What  is the typical value of power

    • A.

      0.004 to 0.09 watts

    • B.

      0.004 to 0.09 joules

    • C.

      0.04 to 0.9 watts

    • D.

      0.04 to 0.9 joules

    Correct Answer
    A. 0.004 to 0.09 watts
    Explanation
    The typical value of power is measured in watts, which is the rate at which work is done or energy is transferred. The given range of 0.004 to 0.09 watts represents the typical values for power in various applications or devices.

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  • 24. 

    Power is determined by

    • A.

      Sound source

    • B.

      Medium

    • C.

      Both

    Correct Answer
    A. Sound source
    Explanation
    Power is determined by the sound source. The power of a sound wave is directly related to the energy it carries. The sound source is responsible for generating the sound wave and determining the amount of energy it contains. The medium through which the sound wave travels may affect the propagation and intensity of the sound, but it does not directly determine the power of the sound wave. Therefore, the correct answer is the sound source.

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  • 25. 

    What is the typical value of amplitude?

    • A.

      1-3MPa

    • B.

      1-3Pa

    • C.

      10-30MPa

    • D.

      10-30Pa

    Correct Answer
    A. 1-3MPa
    Explanation
    The typical value of amplitude is 1-3MPa. Amplitude refers to the maximum displacement or distance from the equilibrium position in a wave. In this case, the range of 1-3MPa indicates that the wave's displacement can vary between 1 and 3 million pascals. The unit "MPa" stands for megapascals, which is a unit of pressure commonly used in engineering and physics.

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  • 26. 

    How much does the power increas/decrease if the amplited factor is 5

    • A.

      5

    • B.

      25

    • C.

      1/5

    • D.

      1/25

    Correct Answer
    B. 25
    Explanation
    The correct answer is 25 because when the amplification factor is 5, the power increases by a factor of 25. This is because power is proportional to the square of the amplification factor. So, when the amplification factor is 5, the power increases by 5*5=25 times.

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  • 27. 

    Intensity is determined by ?

    • A.

      Sound source

    • B.

      Medium

    • C.

      Both

    Correct Answer
    A. Sound source
    Explanation
    The intensity of sound is determined by the sound source. The sound source is responsible for generating the sound waves, which carry the energy of the sound. The amplitude of the sound waves, which determines the intensity, is determined by the characteristics of the sound source, such as its power or vibration. The medium through which the sound travels can affect the propagation of the sound waves, but it does not directly determine the intensity of the sound. Therefore, the correct answer is sound source.

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  • 28. 

    Is intensity adjustable?

    • A.

      Yes

    • B.

      No

    Correct Answer
    A. Yes
    Explanation
    The given question asks whether the intensity is adjustable or not. The answer "Yes" indicates that the intensity can be adjusted, implying that it is possible to change the level or strength of something, such as brightness, volume, or power.

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  • 29. 

    If the power is increased by 10 the intensity is 

    • A.

      Decreased by 1/10

    • B.

      Increased by 100

    • C.

      Decreased by 10

    • D.

      Increased by 10

    Correct Answer
    D. Increased by 10
    Explanation
    When the power is increased by 10, the intensity is also increased by 10. This is because intensity is directly proportional to power. Therefore, if the power is increased by a certain factor, the intensity will also increase by the same factor. In this case, since the power is increased by 10, the intensity will also increase by 10.

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  • 30. 

    What relationship do power and amplitude have?

    • A.

      Direct

    • B.

      Inverse

    • C.

      Proportional

    • D.

      None

    Correct Answer
    C. Proportional
    Explanation
    Power and amplitude have a proportional relationship. This means that as the power increases, the amplitude also increases, and vice versa. In other words, the amount of power in a system is directly related to the amplitude of the signal.

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  • 31. 

    If the intensity is tripled than the amplitude is tripled

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    see pg31

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  • 32. 

    What is the unit for wavelength

    • A.

      Joules

    • B.

      Cm

    • C.

      Hertz

    • D.

      Pascals

    Correct Answer
    B. Cm
    Explanation
    The unit for wavelength is centimeters (cm). Wavelength is a measurement of the distance between two consecutive points in a wave, such as from one crest to the next crest. It is commonly represented by the symbol λ (lambda) and is measured in units of length, such as meters, centimeters, or nanometers. In this case, the correct answer is cm, indicating that wavelength is typically measured in centimeters.

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  • 33. 

    What is the typical vale for wavelength?

    • A.

      0.15-0.8 cm

    • B.

      0.15-0.8 mm

    • C.

      0.015-0.08 mm

    • D.

      0.15-0.8 m

    Correct Answer
    B. 0.15-0.8 mm
    Explanation
    The typical value for wavelength is 0.15-0.8 mm. Wavelength is a measure of the distance between two consecutive points in a wave that are in phase. It is usually measured in meters, but in this case, it is given in millimeters. This range of 0.15-0.8 mm is within the typical range for wavelengths of electromagnetic waves, such as visible light.

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  • 34. 

    What is the relationship between power and intensity

    • A.

      Direct

    • B.

      Inverse

    • C.

      Proportional

    • D.

      None

    Correct Answer
    C. Proportional
    Explanation
    Power and intensity are directly proportional to each other. This means that as the power increases, the intensity also increases, and vice versa. In other words, the higher the power of a source, the greater the intensity of the wave it produces. This relationship can be observed in various contexts, such as in the field of physics, where power is often associated with the amount of energy transferred, and intensity refers to the strength or concentration of that energy.

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  • 35. 

    Is wavelenth adjustable

    • A.

      Yes

    • B.

      No

    Correct Answer
    B. No
    Explanation
    The question asks whether the wavelength is adjustable. The answer is "No" because the wavelength of a wave is determined by the source of the wave and the medium through which it travels. It is not something that can be easily adjusted or changed. The wavelength of a wave is a characteristic property that remains constant for a given source and medium.

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  • 36. 

    What is teh relationship between wavelength and frequency?

    • A.

      Direct

    • B.

      Inverse

    • C.

      Proportional

    • D.

      None

    Correct Answer
    B. Inverse
    Explanation
    The relationship between wavelength and frequency is inverse. This means that as the wavelength increases, the frequency decreases, and vice versa. This can be observed in the wave equation, where the product of wavelength and frequency is equal to the speed of the wave. Therefore, if one of them increases, the other must decrease in order to maintain the same speed.

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  • 37. 

    The ability of an object to resist compression

    • A.

      Volume

    • B.

      Density

    • C.

      Stiffiness

    Correct Answer
    C. Stiffiness
    Explanation
    Stiffness refers to the ability of an object to resist compression. It measures how much an object deforms under an applied force. A higher stiffness indicates that the object is more resistant to compression and will deform less. Therefore, stiffness is the correct answer as it directly relates to the given description of an object's ability to resist compression.

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  • 38. 

    Wavelength is determined by

    • A.

      Sound source

    • B.

      Medium

    • C.

      Both

    Correct Answer
    C. Both
    Explanation
    The wavelength of a sound wave is determined by both the sound source and the medium it travels through. The sound source, such as a musical instrument or a person's voice, produces the sound wave with a specific frequency. The medium, which can be air, water, or any other substance, affects how the sound wave travels and can alter its wavelength. Therefore, both the characteristics of the sound source and the properties of the medium play a role in determining the wavelength of a sound wave.

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  • 39. 

    Speed is determined by

    • A.

      Sound source

    • B.

      Medium

    • C.

      Both

    Correct Answer
    B. Medium
    Explanation
    The speed of sound is determined by the medium through which it travels. Different mediums, such as air, water, or solids, have different properties that affect the speed at which sound waves can propagate. For example, sound travels faster in solids than in liquids, and faster in liquids than in gases. Therefore, the medium plays a crucial role in determining the speed of sound. The sound source itself does not directly affect the speed of sound, as it is primarily dependent on the properties of the medium.

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  • 40. 

    Sound with a frequency of 10MHz and sound with 20MHz travel and different speeds in the same medium

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Sound with different frequencies will travel at the same speed in the same medium. The speed of sound depends on the properties of the medium through which it is traveling, such as temperature and density, but not on the frequency of the sound waves. Therefore, sound waves with frequencies of 10MHz and 20MHz will travel at the same speed in the same medium.

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  • 41. 

    What is the spped for soft tissue?

    • A.

      1460 m/s

    • B.

      1540 m/s

    • C.

      1540

    • D.

      3500 m/s

    Correct Answer
    B. 1540 m/s
    Explanation
    The speed for soft tissue is 1540 m/s. This is the commonly accepted value for the speed of sound in soft tissue, which includes organs, muscles, and other non-bony structures in the human body. This speed is used in medical imaging techniques such as ultrasound, where sound waves are used to create images of the internal organs. By knowing the speed of sound in soft tissue, accurate measurements and calculations can be made to interpret the ultrasound images.

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  • 42. 

    Arrange from fastest to slowest

    • A.

      Air, metal, water

    • B.

      Water, metal, air

    • C.

      Metal, water, air

    Correct Answer
    C. Metal, water, air
    Explanation
    The given answer "metal, water, air" arranges the substances from fastest to slowest in terms of sound speed. Sound travels fastest through metal due to its high density and strong atomic bonds. Water comes next as it is denser than air and has a higher molecular arrangement. Air is the slowest as it has the lowest density and its particles are more spread out, resulting in a slower propagation of sound waves.

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  • 43. 

    What is the typical value for speed

    • A.

      .5 m/s- 4m/s

    • B.

      5 m/s- 40m/s

    • C.

      50 m/s- 400m/s

    • D.

      500 m/s- 4000m/s

    Correct Answer
    D. 500 m/s- 4000m/s
    Explanation
    The typical value for speed is usually within the range of 5 m/s to 40 m/s. However, in certain cases, such as in high-speed transportation or scientific experiments, speeds can reach as high as 500 m/s to 4000 m/s.

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  • 44. 

    Arrange from fastest to slowest

    • A.

      Lung, fat, soft tissue, liver, bood, muscle, tendons, bone

    • B.

      Bone, tendons, muscles, blood, liver, fat, soft tissue, lung

    • C.

      Bone, tendons, muscles, blood, liver, soft tissue, fat, lung

    • D.

      Bone, muscles, tendons, blood, liver, soft tissue, fat, lung

    Correct Answer
    C. Bone, tendons, muscles, blood, liver, soft tissue, fat, lung
  • 45. 

    Arrange from slowest of fastest

    • A.

      Lung, fat, soft tissue, liver, bood, muscle, tendons, bone

    • B.

      Lung, soft tissue, fat, liver, blood, muscle, tendons, bone

    • C.

      Bone, tendons, muscles, blood, liver, soft tissue, fat, lung

    • D.

      Bone, muscles, tendons, blood, liver, soft tissue, fat, lung

    Correct Answer
    A. Lung, fat, soft tissue, liver, bood, muscle, tendons, bone
  • 46. 

    What is the units for propagation speed

    • A.

      Meters

    • B.

      Seconds

    • C.

      Hertz

    • D.

      Meters per second

    Correct Answer
    D. Meters per second
    Explanation
    The units for propagation speed are meters per second. Propagation speed refers to the rate at which a wave travels through a medium. In this case, it is measured in meters per second, indicating the distance traveled by the wave in meters divided by the time taken in seconds. This unit is commonly used to express the speed of waves such as sound waves, light waves, and electromagnetic waves.

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  • 47. 

    Relative weight of a material

    • A.

      Volume

    • B.

      Density

    • C.

      Stiffiness

    Correct Answer
    B. Density
    Explanation
    Density is a measure of how much mass is contained in a given volume of a material. It is calculated by dividing the mass of the material by its volume. The relative weight of a material refers to how heavy it is compared to other materials. Since density is a measure of mass per unit volume, it directly affects the weight of a material. Therefore, the density of a material is a determining factor in its relative weight.

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  • 48. 

    What is the relationship between wavelength and intensity

    • A.

      Direct

    • B.

      Inverse

    • C.

      None

    Correct Answer
    C. None
    Explanation
    There is no direct relationship between wavelength and intensity. Wavelength refers to the distance between two consecutive points in a wave, while intensity refers to the amount of energy carried by the wave. These two properties are independent of each other, meaning that a change in wavelength does not necessarily cause a change in intensity, and vice versa.

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  • 49. 

    As stiffness increases speed increase

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    This statement is true because as stiffness increases, the material or object becomes less flexible and more resistant to deformation. This increased stiffness allows for faster transmission of forces and energy, resulting in an increase in speed. Therefore, there is a direct correlation between stiffness and speed, with an increase in stiffness leading to an increase in speed.

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  • 50. 

    What is the relationship between frequency and power

    • A.

      Direct

    • B.

      Inverse

    • C.

      None

    Correct Answer
    C. None
    Explanation
    Frequency and power are not directly or inversely related. The relationship between frequency and power depends on the specific context or system being considered. In some cases, an increase in frequency may lead to an increase in power, while in other cases, it may have no effect on power. Similarly, a decrease in frequency may or may not result in a decrease in power. Therefore, the relationship between frequency and power cannot be generalized as direct or inverse, hence the correct answer is none.

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