# Quiz On Physics GK Question And Answers

48 Questions | Total Attempts: 241

Settings

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

• 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.

• 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.

• C.

Check the same converter

• D.

• 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.