Quiz On Physics GK Question And Answers

48 Questions | By Paga | Last updated: Mar 21, 2022 | Total Attempts: 241

Questions

Settings

Create your own 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?

Questions and Answers

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
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
3.

Which of the following is determined by the source and the medium?
- A.
  
  Frequency
- B.
  
  Period
- C.
  
  Propagation speed
- 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
5.

Put in decreasing order of propagation speed.
- A.
  
  Gas, liquid and solid
- B.
  
  Solid liquid and gas
- C.
  
  Liquid gas solid
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
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
8.

What is the minimum value of the duty factor?
- A.
  
  10.0
- B.
  
  1%
- C.
  
  1.0
- 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
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
11.

With normal incidence, what factors affect refraction of US?
- A.
  
  Propagation speeds
- B.
  
  Frequencies
- C.
  
  Attenuation coefficients
- 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%
13.

How many cm are 60 millimeters
- A.
  
  600
- B.
  
  6
- C.
  
  0.6
- D.
  
  0.006
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
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
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
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
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
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
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
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
22.

Compression is used to
- A.
  
  Decrease the amplitude
- B.
  
  Decrease the range of amplitudes
- C.
  
  Decrease the range of frequencies
23.

In which of these biologic tissues will sound waves propagate most quickly?
- A.
  
  Tendon
- B.
  
  Blood
- C.
  
  Lung
- D.
  
  Fat
- E.
  
  Amniotic fluid
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
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