Quiz On Physics GK Question and Answers

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

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Quiz On Physics GK Question and Answers - 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.

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3. Put in decreasing order

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

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5. Which transducer would be best to image superficial structures?

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6. What is the production of deformation from voltage called?

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7. The frequency closest to the lower limit of US is

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8. How many cm are 60 millimeters

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

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

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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

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12. Put in increasing order of propagation speed

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13. Compression is used to

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

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

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?

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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?

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18. What is propagation speed determined by

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19. What is the minimum value of the duty factor?

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

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

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

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

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

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

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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

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27. Under which of the following conditions is lateral resolution improved?

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28. Which of the following is associated with cavitation?

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29. All of the following will improve temporal resolution EXCEPT

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

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31. How is range ambiguity artifact eliminated?

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32. Under which circumstances is cavitation most likely to occur

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

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?

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35. All of the following are true of normal cavitation EXCEPT:

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

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

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

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

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40. With normal incidence, what factors affect refraction of US?

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

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42. What are typical clinical Doppler frequencies

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43. As a result of _____________ the propagation sped increases

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

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45. Increasing the wall filter during Doppler sampling will:

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

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

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48. Which of the following improves signal to noise ratio

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What component of a transducer changes electrical to mechanical and...
Put in decreasing order of propagation speed.
Put in decreasing order
If the frequency of US is increased from 0.77 MHz to 1.54 MHz, what...
Which transducer would be best to image superficial structures?
What is the production of deformation from voltage called?
The frequency closest to the lower limit of US is
How many cm are 60 millimeters
With good images on the CRT but not on the strip chart recorder, one...
The most likely amount of reflection at a boundary between soft tissue...
If the output of an US machine is calibrated in dB and the output is...
Put in increasing order of propagation speed
Compression is used to
What is the actual time that an US machine is creating a pulse?
If a 5MHz sound wave is traveling in the tissues listed below, which...
Which of the following will result in the greatest number of shades of...
The impedances of tissue is 3 x 10^5 rayls and for the PZT crystal is...
What is propagation speed determined by
What is the minimum value of the duty factor?
In which of these biologic tissues will sound waves propagate most...
What is displayed on the y-axis of an m-mode image?
What is the elimination of voltages that do not exceed a certain...
If the frame rate increases and the lines per frame is unchanged, what...
All of the following statements regarding in-vitro bioeffects are true...
How many data bits are needed to represent 46 gray shades?
As the impedances (z (rayls) = density (kg/m^3) x prop. speed (m/s) or...
Under which of the following conditions is lateral resolution...
Which of the following is associated with cavitation?
All of the following will improve temporal resolution EXCEPT
If the intensity of a sound beam remains unchanged while the beam area...
How is range ambiguity artifact eliminated?
Under which circumstances is cavitation most likely to occur
What is the maximum velocity limit for a 3 MHz CW Doppler unit...
What is the significance of gray scale variation in the spectrum of a...
All of the following are true of normal cavitation EXCEPT:
TRUE OR FALSEA system which was working well now does not display...
Which of the following is determined by the source and the medium?
A commonly used process for determining direction in a Doppler...
What method is used to steer the color beam with a linear array...
With normal incidence, what factors affect refraction of US?
An amplifier of an ultrasound system increases the voltage of a signal...
What are typical clinical Doppler frequencies
As a result of _____________ the propagation sped increases
If 300,000 cycles occur in a second, what is the wave's frequency?
Increasing the wall filter during Doppler sampling will:
What would be the most likely result from increasing the transmit...
The packet size in color Doppler refers to the number of :
Which of the following improves signal to noise ratio
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