Quiz On Physics GK Question And Answers

48 Questions | Attempts: 241
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  • 1/48 Questions

    What component of a transducer changes electrical to mechanical and mechanical back to electrical engergy?

    • PZT
    • Transducer
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About This Quiz

The study of matter, motion, energy, force and much more is on the line in this quiz as we take a closer look at the scientific subgenre of physics. What can you tell us about the following topics?

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  • 2. 

    Put in decreasing order of propagation speed.

    • Gas, liquid and solid

    • Solid liquid and gas

    • Liquid gas solid

    Correct Answer
    A. Solid liquid and gas
  • 3. 

    Put in decreasing order

    • Deca, deci, centi, micro

    • Deci, deca, centi, micro

    • Micro, centi, deca, deci

    • Centi, micro, deci, deca

    Correct Answer
    A. Deca, deci, centi, micro
  • 4. 

    If the frequency of US is increased from 0.77 MHz to 1.54 MHz, what happends to the wavelength?

    • Doubles

    • Halved

    • Remain the same

    • 4 times greater

    Correct Answer
    A. Halved
  • 5. 

    Which transducer would be best to image superficial structures?

    • Small diameter, high frequency

    • Small diameter, low frequency

    • Large diameter, high frequency

    • Large diameter, low frequency

    Correct Answer
    A. Small diameter, high frequency
  • 6. 

    What is the production of deformation from voltage called?

    • Piezoelectricity

    • Impedance

    • Cogeneration

    • Flux

    Correct Answer
    A. Piezoelectricity
  • 7. 

    The frequency closest to the lower limit of US is

    • 19,000 kHz

    • 10,000 MHz

    • 20,000 msec

    • 15,000 Hz

    Correct Answer
    A. 15,000 Hz
  • 8. 

    How many cm are 60 millimeters

    • 600

    • 6

    • 0.6

    • 0.006

    Correct Answer
    A. 6
    Explanation
    60 mm = 60.0 mm move decimal to the left one unit so 60.0 mm = 6 cm

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  • 9. 

    With good images on the CRT but not on the strip chart recorder, one should

    • Increase the gain

    • Check the scan head

    • Check the same converter

    • Adjust the recorder

    Correct Answer
    A. Adjust the recorder
  • 10. 

    The most likely amount of reflection at a boundary between soft tissue is:

    • 1%

    • 22%

    • 34%

    • 99%

    Correct Answer
    A. 1%
  • 11. 

    If the output of an US machine is calibrated in dB and the output is increased by 20 dB, the beam intensity is increased

    • 100 times

    • 1,000,000 times

    • 20 times

    • 10 times

    Correct Answer
    A. 100 times
  • 12. 

    Put in increasing order of propagation speed

    • Air bone water

    • Bone water air

    • Air water bone

    • Water air bone

    • Bone air water

    Correct Answer
    A. Air water bone
  • 13. 

    Compression is used to

    • Decrease the amplitude

    • Decrease the range of amplitudes

    • Decrease the range of frequencies

    Correct Answer
    A. Decrease the range of amplitudes
  • 14. 

    What is the actual time that an US machine is creating a pulse?

    • Duty factor

    • Period

    • Pulse period

    • Pulse duration

    Correct Answer
    A. Pulse duration
  • 15. 

    If a 5MHz sound wave is traveling in the tissues listed below, which will have the longest wavelength?

    • Fat

    • Air

    • Muscle

    • Bone

    Correct Answer
    A. Bone
    Explanation
    The speed of sound in bone is the highest 3500 m/s. Solid travels fastest in solids, slower in liquids and slowest in gas. speed m/s = frequency Hz x wavelength m

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  • 16. 

    Which of the following will result in the greatest number of shades of grapy in a digital image display?

    • Large pixels with many bits/pixel

    • Small pixels with few bits/pixel

    • Many TV lines per frame

    • High contrast

    • Narrow dynamic range

    Correct Answer
    A. Large pixels with many bits/pixel
  • 17. 

    The impedances of tissue is 3 x 10^5 rayls and for the PZT crystal is 6 x 10^6 rayls.  What is the best impedance for the matching layer?

    • 36 x 10^5

    • 3,600

    • 10,000

    • 9.5 x 10 ^5

    • 9 x 10^4

    Correct Answer
    A. 9.5 x 10 ^5
  • 18. 

    What is propagation speed determined by

    • Wavelength

    • Intensity and density

    • Amplitude

    • Density and elasticity

    • Density and amplitude

    Correct Answer
    A. Density and elasticity
  • 19. 

    What is the minimum value of the duty factor?

    • 10.0

    • 1%

    • 1.0

    • 0.0%

    Correct Answer
    A. 0.0%
  • 20. 

    In which of these biologic tissues will sound waves propagate most quickly?

    • Tendon

    • Blood

    • Lung

    • Fat

    • Amniotic fluid

    Correct Answer
    A. Tendon
  • 21. 

    What is displayed on the y-axis of an m-mode image?

    • Time

    • Time of flight

    • Echo intensity

    • Red blood cell velocity

    Correct Answer
    A. Time of flight
  • 22. 

    What is the elimination of voltages that do not exceed a certain level?

    • Amplification

    • Decompensation

    • Reject

    • Demodulation

    Correct Answer
    A. Reject
  • 23. 

    If the frame rate increases and the lines per frame is unchanged, what else must happen?

    • US speed increases

    • Frequency increases

    • Depth increases

    • Depth decreases

    Correct Answer
    A. Depth decreases
  • 24. 

    All of the following statements regarding in-vitro bioeffects are true EXCEPT?

    • In vitro bioeffects conclusions are clinically relevant

    • In vitro bioeffects are always real

    • In vitro bioeffects are vey important

    • In vitro bioeffects may not be applicable to clinical settings

    Correct Answer
    A. In vitro bioeffects conclusions are clinically relevant
  • 25. 

    How many data bits are needed to represent 46 gray shades?

    • 46

    • 5

    • 6

    • 8

    Correct Answer
    A. 6
  • 26. 

    As the impedances (z (rayls) = density (kg/m^3) x prop. speed (m/s) or acoustic resistance to sound traveling in a medium, becomes vastly different, the

    • Reflection increases

    • Transmission increases

    • Refraction increases

    • Absorption increases

    Correct Answer
    A. Reflection increases
  • 27. 

    Under which of the following conditions is lateral resolution improved?

    • Decreased beam diameter

    • Decreased pulse duration

    • Decreased imaging depth

    • Decreased pixel size

    • Decreased spatial pulse length

    Correct Answer
    A. Decreased beam diameter
  • 28. 

    Which of the following is associated with cavitation?

    • Thermal index

    • Snell's Law

    • Avagadro's Number

    • Mechanical index

    Correct Answer
    A. Mechanical index
  • 29. 

    All of the following will improve temporal resolution EXCEPT

    • Increased line density

    • Single rather than multi focus

    • Higher frame rate

    • Shallower depth of view

    • Slower speed of sound in a medium

    Correct Answer
    A. Increased line density
  • 30. 

    If the intensity of a sound beam remains unchanged while the beam area is reduced in half, what has happend to the power?

    • Quadrupled

    • Doubled

    • Halved

    • Unchanged

    Correct Answer
    A. Halved
  • 31. 

    How is range ambiguity artifact eliminated?

    • Lower the PRF

    • Raise the PRF

    • Increase the gain

    • Use a lower frequency transducer

    Correct Answer
    A. Lower the PRF
  • 32. 

    Under which circumstances is cavitation most likely to occur

    • High frequency and low power

    • High intensity and high frequency

    • Low intensity and low frequency

    • Low frequency and high signal amplitude

    Correct Answer
    A. Low frequency and high signal amplitude
  • 33. 

    What is the maximum velocity limit for a 3 MHz CW Doppler unit operating at a depth of 4cm?

    • 40 cm/s

    • 200 cm/s

    • 2.5 m/s

    • 4 m/s

    • None of the above

    Correct Answer
    A. None of the above
    Explanation
    CW Doppler does not have an imposed maximum velocity limit like PW Doppler. In fact, CW Doppler may be used in instances where accurate velocities cannot be obtained with PW Doppler

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  • 34. 

    What is the significance of gray scale variation in the spectrum of a pulssed wave Doppler display?

    • It represents the number of red blood cells creating the reflection

    • It represents the velocity of red blood cells

    • It represents the speed of red blood cells

    • It represents the convergence of red blood cell lamina

    • It determines the enseble length

    Correct Answer
    A. It represents the number of red blood cells creating the reflection
  • 35. 

    All of the following are true of normal cavitation EXCEPT:

    • Harmful bioeffects are commonly observed

    • It is also known as inertial cavitation

    • Only a 10% increase in pressure is needed to convert to this from stable cavitation

    • Temperatures in the thousands of degreesare created

    • It is consistent with shock waves

    Correct Answer
    A. Harmful bioeffects are commonly observed
  • 36. 

    TRUE OR FALSEA system which was working well now does not display clear images in the far field.  This may be a problem with the monitor.

    • True

    • False

    Correct Answer
    A. True
  • 37. 

    Which of the following is determined by the source and the medium?

    • Frequency

    • Period

    • Propagation speed

    • Range resolution

    Correct Answer
    A. Range resolution
  • 38. 

    A commonly used process for determining direction in a Doppler instrument is

    • Zero crossing detection

    • Autocorrelation

    • Phase quadrature detection

    • Range gating

    • Spectral analysis

    Correct Answer
    A. Phase quadrature detection
  • 39. 

    What method is used to steer the color beam with a linear array transducer?

    • Mechanical

    • Electronic time delays

    • Electronic voltage variation

    • Apodization

    • The color beam cannot be steered with a linear array transducer

    Correct Answer
    A. Electronic time delays
  • 40. 

    With normal incidence, what factors affect refraction of US?

    • Propagation speeds

    • Frequencies

    • Attenuation coefficients

    • None of the above

    Correct Answer
    A. None of the above
  • 41. 

    An amplifier of an ultrasound system increases the voltage of a signal from 0.0001 to 0.1 volt.  What is the amplification

    • 60 dB

    • 30 dB

    • 1,000 dB

    • 90 dB

    Correct Answer
    A. 60 dB
  • 42. 

    What are typical clinical Doppler frequencies

    • 1 - 10,000 Hz

    • 1 - 10 MHz

    • 2 - 1,000 kHz

    • 40 - 45 kHz

    Correct Answer
    A. 1 - 10,000 Hz
  • 43. 

    As a result of _____________ the propagation sped increases

    • Increasing stiffness and increasing density

    • Increasing stiffness and increasing elasticity

    • Decreasing compressibility and decreasing density

    • Decreasing stiffness and decreasing density

    Correct Answer
    A. Decreasing compressibility and decreasing density
  • 44. 

    If 300,000 cycles occur in a second, what is the wave's frequency?

    • 3 MHz

    • 30 kHz

    • 300 MHz

    • 3 kHz

    • 0.3 MHz

    Correct Answer
    A. 0.3 MHz
  • 45. 

    Increasing the wall filter during Doppler sampling will:

    • Increase visibility of low velocity signals

    • Increase spectral broadening

    • Decrease bandwidth

    • Reduce display of low frequency shifts

    • Reduce aliasing

    Correct Answer
    A. Reduce display of low frequency shifts
  • 46. 

    What would be the most likely result from increasing the transmit frequecy of the color Doppler?

    • Improve sensitivity to slow flow

    • Improved penetration for imaging flow in deep tissues

    • Reduced flash artifact obscuring small vessel flow

    • Reduced color Doppler aliasing

    • Improve visibility of complex flow hemodynamics

    Correct Answer
    A. Improve sensitivity to slow flow
  • 47. 

    The packet size in color Doppler refers to the number of :

    • Pulses per second

    • Sample volumes per scan line

    • Scan lines per unit area

    • Pulse - listen cycles per acoustic scan line

    • Pulses required to create one frame

    Correct Answer
    A. Pulse - listen cycles per acoustic scan line
  • 48. 

    Which of the following improves signal to noise ratio

    • Dynamic range

    • Frame averaging

    • Gray scale

    • Edge enhancement

    • Receiver gain

    Correct Answer
    A. Frame averaging

Quiz Review Timeline (Updated): Mar 21, 2022 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 21, 2022
    Quiz Edited by
    ProProfs Editorial Team
  • Jan 31, 2010
    Quiz Created by
    Paga
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