Quiz On Physics GK Question And Answers
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?
- 1.
The frequency closest to the lower limit of US is
- A.
19,000 kHz
- B.
10,000 MHz
- C.
20,000 msec
- D.
15,000 Hz
Correct Answer
D. 15,000 Hz -
- 2.
Put in decreasing order
- A.
Deca, deci, centi, micro
- B.
Deci, deca, centi, micro
- C.
Micro, centi, deca, deci
- D.
Centi, micro, deci, deca
Correct Answer
A. Deca, deci, centi, micro -
- 3.
Which of the following is determined by the source and the medium?
- A.
Frequency
- B.
Period
- C.
Propagation speed
- D.
Range resolution
Correct Answer
D. Range resolution -
- 4.
As a result of _____________ the propagation sped increases
- A.
Increasing stiffness and increasing density
- B.
Increasing stiffness and increasing elasticity
- C.
Decreasing compressibility and decreasing density
- D.
Decreasing stiffness and decreasing density
Correct Answer
C. Decreasing compressibility and decreasing density -
- 5.
Put in decreasing order of propagation speed.
- A.
Gas, liquid and solid
- B.
Solid liquid and gas
- C.
Liquid gas solid
Correct Answer
B. Solid liquid and gas -
- 6.
If the frequency of US is increased from 0.77 MHz to 1.54 MHz, what happends to the wavelength?
- A.
Doubles
- B.
Halved
- C.
Remain the same
- D.
4 times greater
Correct Answer
B. Halved -
- 7.
If the intensity of a sound beam remains unchanged while the beam area is reduced in half, what has happend to the power?
- A.
Quadrupled
- B.
Doubled
- C.
Halved
- D.
Unchanged
Correct Answer
C. Halved -
- 8.
What is the minimum value of the duty factor?
- A.
10.0
- B.
1%
- C.
1.0
- D.
0.0%
Correct Answer
D. 0.0% -
- 9.
If a 5MHz sound wave is traveling in the tissues listed below, which will have the longest wavelength?
- A.
Fat
- B.
Air
- C.
Muscle
- D.
Bone
Correct Answer
D. BoneExplanation
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 mRate this question:
-
- 10.
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
- A.
Reflection increases
- B.
Transmission increases
- C.
Refraction increases
- D.
Absorption increases
Correct Answer
A. Reflection increases -
- 11.
With normal incidence, what factors affect refraction of US?
- A.
Propagation speeds
- B.
Frequencies
- C.
Attenuation coefficients
- D.
None of the above
Correct Answer
D. None of the above -
- 12.
The most likely amount of reflection at a boundary between soft tissue is:
- A.
1%
- B.
22%
- C.
34%
- D.
99%
Correct Answer
A. 1% -
- 13.
How many cm are 60 millimeters
- A.
600
- B.
6
- C.
0.6
- D.
0.006
Correct Answer
B. 6Explanation
60 mm = 60.0 mm move decimal to the left one unit so 60.0 mm = 6 cmRate this question:
-
- 14.
How is range ambiguity artifact eliminated?
- A.
Lower the PRF
- B.
Raise the PRF
- C.
Increase the gain
- D.
Use a lower frequency transducer
Correct Answer
A. Lower the PRF -
- 15.
Under which of the following conditions is lateral resolution improved?
- A.
Decreased beam diameter
- B.
Decreased pulse duration
- C.
Decreased imaging depth
- D.
Decreased pixel size
- E.
Decreased spatial pulse length
Correct Answer
A. Decreased beam diameter -
- 16.
Which transducer would be best to image superficial structures?
- A.
Small diameter, high frequency
- B.
Small diameter, low frequency
- C.
Large diameter, high frequency
- D.
Large diameter, low frequency
Correct Answer
A. Small diameter, high frequency -
- 17.
If the frame rate increases and the lines per frame is unchanged, what else must happen?
- A.
US speed increases
- B.
Frequency increases
- C.
Depth increases
- D.
Depth decreases
Correct Answer
D. Depth decreases -
- 18.
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.
- A.
True
- B.
False
Correct Answer
A. True -
- 19.
If the output of an US machine is calibrated in dB and the output is increased by 20 dB, the beam intensity is increased
- A.
100 times
- B.
1,000,000 times
- C.
20 times
- D.
10 times
Correct Answer
A. 100 times -
- 20.
Which of the following will result in the greatest number of shades of grapy in a digital image display?
- A.
Large pixels with many bits/pixel
- B.
Small pixels with few bits/pixel
- C.
Many TV lines per frame
- D.
High contrast
- E.
Narrow dynamic range
Correct Answer
A. Large pixels with many bits/pixel -
- 21.
With good images on the CRT but not on the strip chart recorder, one should
- A.
Increase the gain
- B.
Check the scan head
- C.
Check the same converter
- D.
Adjust the recorder
Correct Answer
D. Adjust the recorder -
- 22.
Compression is used to
- A.
Decrease the amplitude
- B.
Decrease the range of amplitudes
- C.
Decrease the range of frequencies
Correct Answer
B. Decrease the range of amplitudes -
- 23.
In which of these biologic tissues will sound waves propagate most quickly?
- A.
Tendon
- B.
Blood
- C.
Lung
- D.
Fat
- E.
Amniotic fluid
Correct Answer
A. Tendon -
- 24.
All of the following statements regarding in-vitro bioeffects are true EXCEPT?
- A.
In vitro bioeffects conclusions are clinically relevant
- B.
In vitro bioeffects are always real
- C.
In vitro bioeffects are vey important
- D.
In vitro bioeffects may not be applicable to clinical settings
Correct Answer
A. In vitro bioeffects conclusions are clinically relevant -
- 25.
Which of the following improves signal to noise ratio
- A.
Dynamic range
- B.
Frame averaging
- C.
Gray scale
- D.
Edge enhancement
- E.
Receiver gain
Correct Answer
B. Frame averaging -
- 26.
Under which circumstances is cavitation most likely to occur
- A.
High frequency and low power
- B.
High intensity and high frequency
- C.
Low intensity and low frequency
- D.
Low frequency and high signal amplitude
Correct Answer
D. Low frequency and high signal amplitude -
- 27.
What is displayed on the y-axis of an m-mode image?
- A.
Time
- B.
Time of flight
- C.
Echo intensity
- D.
Red blood cell velocity
Correct Answer
B. Time of flight -
- 28.
An amplifier of an ultrasound system increases the voltage of a signal from 0.0001 to 0.1 volt. What is the amplification
- A.
60 dB
- B.
30 dB
- C.
1,000 dB
- D.
90 dB
Correct Answer
A. 60 dB -
- 29.
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?
- A.
36 x 10^5
- B.
3,600
- C.
10,000
- D.
9.5 x 10 ^5
- E.
9 x 10^4
Correct Answer
D. 9.5 x 10 ^5 -
- 30.
Put in increasing order of propagation speed
- A.
Air bone water
- B.
Bone water air
- C.
Air water bone
- D.
Water air bone
- E.
Bone air water
Correct Answer
C. Air water bone -
- 31.
What is propagation speed determined by
- A.
Wavelength
- B.
Intensity and density
- C.
Amplitude
- D.
Density and elasticity
- E.
Density and amplitude
Correct Answer
D. Density and elasticity -
- 32.
If 300,000 cycles occur in a second, what is the wave's frequency?
- A.
3 MHz
- B.
30 kHz
- C.
300 MHz
- D.
3 kHz
- E.
0.3 MHz
Correct Answer
E. 0.3 MHz -
- 33.
All of the following will improve temporal resolution EXCEPT
- A.
Increased line density
- B.
Single rather than multi focus
- C.
Higher frame rate
- D.
Shallower depth of view
- E.
Slower speed of sound in a medium
Correct Answer
A. Increased line density -
- 34.
What component of a transducer changes electrical to mechanical and mechanical back to electrical engergy?
- A.
PZT
- B.
Transducer
Correct Answer
A. PZT -
- 35.
What are typical clinical Doppler frequencies
- A.
1 - 10,000 Hz
- B.
1 - 10 MHz
- C.
2 - 1,000 kHz
- D.
40 - 45 kHz
Correct Answer
A. 1 - 10,000 Hz -
- 36.
What is the actual time that an US machine is creating a pulse?
- A.
Duty factor
- B.
Period
- C.
Pulse period
- D.
Pulse duration
Correct Answer
D. Pulse duration -
- 37.
What is the significance of gray scale variation in the spectrum of a pulssed wave Doppler display?
- A.
It represents the number of red blood cells creating the reflection
- B.
It represents the velocity of red blood cells
- C.
It represents the speed of red blood cells
- D.
It represents the convergence of red blood cell lamina
- E.
It determines the enseble length
Correct Answer
A. It represents the number of red blood cells creating the reflection -
- 38.
What is the production of deformation from voltage called?
- A.
Piezoelectricity
- B.
Impedance
- C.
Cogeneration
- D.
Flux
Correct Answer
A. Piezoelectricity -
- 39.
What is the elimination of voltages that do not exceed a certain level?
- A.
Amplification
- B.
Decompensation
- C.
Reject
- D.
Demodulation
Correct Answer
C. Reject -
- 40.
How many data bits are needed to represent 46 gray shades?
- A.
46
- B.
5
- C.
6
- D.
8
Correct Answer
C. 6 -
- 41.
Which of the following is associated with cavitation?
- A.
Thermal index
- B.
Snell's Law
- C.
Avagadro's Number
- D.
Mechanical index
Correct Answer
D. Mechanical index -
- 42.
All of the following are true of normal cavitation EXCEPT:
- A.
Harmful bioeffects are commonly observed
- B.
It is also known as inertial cavitation
- C.
Only a 10% increase in pressure is needed to convert to this from stable cavitation
- D.
Temperatures in the thousands of degreesare created
- E.
It is consistent with shock waves
Correct Answer
A. Harmful bioeffects are commonly observed -
- 43.
The packet size in color Doppler refers to the number of :
- A.
Pulses per second
- B.
Sample volumes per scan line
- C.
Scan lines per unit area
- D.
Pulse - listen cycles per acoustic scan line
- E.
Pulses required to create one frame
Correct Answer
D. Pulse - listen cycles per acoustic scan line -
- 44.
A commonly used process for determining direction in a Doppler instrument is
- A.
Zero crossing detection
- B.
Autocorrelation
- C.
Phase quadrature detection
- D.
Range gating
- E.
Spectral analysis
Correct Answer
C. Phase quadrature detection -
- 45.
What is the maximum velocity limit for a 3 MHz CW Doppler unit operating at a depth of 4cm?
- A.
40 cm/s
- B.
200 cm/s
- C.
2.5 m/s
- D.
4 m/s
- E.
None of the above
Correct Answer
E. None of the aboveExplanation
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 DopplerRate this question:
-
- 46.
What method is used to steer the color beam with a linear array transducer?
- A.
Mechanical
- B.
Electronic time delays
- C.
Electronic voltage variation
- D.
Apodization
- E.
The color beam cannot be steered with a linear array transducer
Correct Answer
B. Electronic time delays -
- 47.
Increasing the wall filter during Doppler sampling will:
- A.
Increase visibility of low velocity signals
- B.
Increase spectral broadening
- C.
Decrease bandwidth
- D.
Reduce display of low frequency shifts
- E.
Reduce aliasing
Correct Answer
D. Reduce display of low frequency shifts -
- 48.
What would be the most likely result from increasing the transmit frequecy of the color Doppler?
- A.
Improve sensitivity to slow flow
- B.
Improved penetration for imaging flow in deep tissues
- C.
Reduced flash artifact obscuring small vessel flow
- D.
Reduced color Doppler aliasing
- E.
Improve visibility of complex flow hemodynamics
Correct Answer
A. Improve sensitivity to slow flow -
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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
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Current Version
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Mar 21, 2022Quiz Edited by
ProProfs Editorial Team -
Jan 31, 2010Quiz Created by
Paga
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