Secound Physics Test
Physics is the study of matter and its behavior through space and if you are a student who wants to practice and learn even more in Physics, then test your knowledge with this quiz. Physics should be fun, so enjoy.
- 1.
The power in a beam is 1 watt and the area is 5cm^2. What is the beam's intensity?
- A.
5 W/cm^2
- B.
1 W/cm^2
- C.
0.2 W/cm^2
- D.
1 W/cm^2
Correct Answer
C. 0.2 W/cm^2 -
- 2.
If the intensity remains the same while the power is doubled, what happens to the beam area?
- A.
Quadrupled
- B.
Doubled
- C.
Halved
- D.
Unchanged
Correct Answer
B. Doubled -
- 3.
A sound beam travels a total of 10 cm in 2 seconds. What is the speed of the sound in this medium?
- A.
10/cmsec
- B.
2 cm/sec
- C.
5 cm/sec
- D.
0.2 cm/sec
Correct Answer
C. 5 cm/sec -
- 4.
The effects of ultrasound upon tissue are called
- A.
Angle of incident
- B.
Absorption
- C.
Bioeffects
Correct Answer
C. Bioeffects -
- 5.
Which of the following waves will have the shortest wavelengths?
- A.
Low frequency traveling in a fast medium
- B.
Low frequency traveling in a slow medium
- C.
High frequency traveling in a fast medium
- D.
High frequency traveling in a slow medium
Correct Answer
D. High frequency traveling in a slow medium -
- 6.
Which of the following is most important in determining the frame rate of a system?
- A.
Speed of sound in the medium
- B.
Dynamich range of the reciever
- C.
Frequency of the transducer
- D.
Transmitter output
Correct Answer
A. Speed of sound in the medium -
- 7.
All of the these decrease temporal resolution except:
- A.
Lower frame rate
- B.
Deeper imaging
- C.
Multi focus imaging
- D.
Narrower sector
Correct Answer
D. Narrower sector -
- 8.
A sonographer adjusts an ultrasound machine to double the depth of view from 5 cm to 10 cm. If the frame rate remains the same, which one of the following also changed?
- A.
Increased line density
- B.
Wider sector
- C.
Multi focus imaging turned on
- D.
Narrower sector
Correct Answer
D. Narrower sector -
- 9.
A sonographer changes an image's sector size from 90 to 45 degrees. The frame rate remained unchanged. What else must have happened?
- A.
The temporal resolution was doubled
- B.
The sector size was doubled
- C.
The line density was doubled
- D.
The imaging depth was halved
Correct Answer
C. The line density was doubled -
- 10.
A sonographer using a phased array ultrasound system turns off the multi-focus feature. What is the most likely consequence of this action?
- A.
The temporal resolution was doubled
- B.
The sector size was doubled
- C.
The line density was doubled
- D.
The imaging depth was halved
Correct Answer
C. The line density was doubled -
- 11.
A sonographer increases the line density from 1 line per degree of sector to 3 lines per degree of sector. What is the consequence of this action
- A.
The frame rate increases
- B.
The temporal resolution decreases
- C.
The imaging quality decreases
- D.
The temporal resolution increases
Correct Answer
B. The temporal resolution decreases -
- 12.
Which of the following will increase frame rate by a factor of three?
- A.
Setting imaging depth to 3 cm
- B.
Changing imaging depth from 10 cm to 3 cm
- C.
Changing sector angle from 90 to 45 degrees
- D.
Changing imaging depth from 21 to 7 cm
- E.
Increasing output power by 3 db
Correct Answer
D. Changing imaging depth from 21 to 7 cm -
- 13.
Which of the following will have no effect upon temporal resolution?
- A.
Increasing imaging depth
- B.
Increasing transducer frequency
- C.
Increasing # of foci
- D.
Decreasing imaging depth
- E.
Decreasing sector size
Correct Answer
B. Increasing transducer frequency -
- 14.
What is the fram rate if each image of ultrasound system is created in 0.02 seconds (1/50th sec)?
- A.
20 Hz
- B.
100 Hz
- C.
50 Hz
- D.
15 Hz
Correct Answer
C. 50 Hz -
- 15.
The critical factor in determining frame rate, line density and imaging depth is the type of transducer used.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The critical factor in determing frame rate, line density and imaging depth is time.Rate this question:
-
- 16.
If the imaging depth of a scan is 15 cm and there are 100 lines in the image, the number of pulses making up the scan is 1500.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
If the imaging depth of a scan is 15 cm and there are 100 lines in the image, the number of pulses making up the scan is 100Rate this question:
-
- 17.
The Doppler effect is present as a __________ when the source and the receiver are _____-
- A.
Frequency shift, in motion relative to each other
- B.
Velocity shift, in motion relative to each other
- C.
Frequency shift, in motion not relative to each other
Correct Answer
A. Frequency shift, in motion relative to each other -
- 18.
A sound beam is traveling from east to west. Blood is traveling from north to south. Which statement is true?
- A.
No Doppler shift will be created
- B.
A maximum Doppler shift is created
- C.
A minimum Doppler shift is created
- D.
The Doppler shift is in the MHz range
Correct Answer
A. No Doppler shift will be created -
- 19.
Starting from the same point, the sound source is moving towards the west at 12 miles/hour and the receiver is moving towards the west at 10 miles/hour. The Doppler shift is
- A.
Positive
- B.
Negative
Correct Answer
B. Negative -
- 20.
Starting from the same point, the receiver is moving towards the west at 12 miles/hour and the source is moving towards the west at 10 miles/hour. The Doppler shift is
- A.
Positive
- B.
Negative
Correct Answer
B. Negative -
- 21.
Doppler shift produces information about
- A.
Location
- B.
Red blodd cells motion
- C.
Velocity
Correct Answer
C. Velocity -
- 22.
What is the difference between speed and velocity?
- A.
Speed has velocity
- B.
Velocity has magnitude
- C.
Speed has direction and magnitude
- D.
Velocity has magnitude and direction
Correct Answer
D. Velocity has magnitude and direction -
- 23.
What is the current method of processing Doppler signals?
- A.
Autocorreclation
- B.
Zero crossing detection
- C.
Range gating
- D.
FFT Fast Fourier Transfrom
Correct Answer
D. FFT Fast Fourier Transfrom -
- 24.
What is the typical range of Doppler shift found in diagnostic imaging examinations?
- A.
1 - 20 Hz
- B.
20 Hz and 20 kHz
- C.
1 - 10,000 Khz
Correct Answer
B. 20 Hz and 20 kHz -
- 25.
The higer the emitted frequency the more likely a pulsed wave signal is to alias.
- A.
True
- B.
False
Correct Answer
A. True -
- 26.
The shallower the sample volume is the more likely a signal is to alias
- A.
True
- B.
False
Correct Answer
B. False -
- 27.
Only pulsed wave Doppler exams have a sample volume
- A.
True
- B.
False
Correct Answer
A. True -
- 28.
An 8 MHz transducer with a PRF of 5,000 Hz is imaging to a depth of 7 cm. What is the Nyquist frequency?
- A.
4 MHz
- B.
3.5 MHz
- C.
2.2 kHz
- D.
2.5 d b
Correct Answer
C. 2.2 kHzExplanation
The actual Nyquist limit is 1/2 of the PRF, in this example 2.5kHz or 2,500 Hz. In this ex. the perfect answer does not appear in the choice. In cases such as this, select the answer that is closest to the actual answerRate this question:
-
- 29.
You are using a tissue equivalent phantom. At a particular depth, reflections are no longer observed. What are you evaluating?
- A.
Dynamic range
- B.
Spatial resolution
- C.
Axial resolution
- D.
Sensitivity
Correct Answer
D. Sensitivity -
- 30.
Using a tissue equivalent phantom, two pins at depths of 2 cm and 10 cm are imaged. On the system display, you measure the distance between two reflections created by these pins. What are you evaluating?
- A.
Dynamic range
- B.
Range calibration
- C.
Spatial postivity
- D.
Lateral resolution
Correct Answer
B. Range calibration -
- 31.
The accuracy of placing reflections on an A-mode B-mode or M-mode in relation to the depth of the reflectors is called
- A.
Dynamic range
- B.
Spatial positivity
- C.
Axial resloution
- D.
Depth calibration
Correct Answer
D. Depth calibration -
- 32.
Two pins in a test object are 100 mm apart. The ultrasound system displays these pins as being 90 mm apart. How far apart will the system display a pair of pins that are actually 70 mm apart?
- A.
90 mm
- B.
70 mm
- C.
63 mm
- D.
60 mm
- E.
7 mm
Correct Answer
C. 63 mmExplanation
The 10 mm error stated in the question represents 10% underestimation of distance. 70/0.10 = 7 70-7= 63Rate this question:
-
Quiz Review Timeline +
Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
-
Current Version
-
Oct 05, 2017Quiz Edited by
ProProfs Editorial Team -
Feb 13, 2010Quiz Created by
Paga
- Acceleration Quizzes
- Acoustic Quizzes
- Chapters Of Physics Quizzes
- Distance Quizzes
- Electrolysis Quizzes
- Energy Quizzes
- ESD Quizzes
- Frequency Quizzes
- Light And Reflection Quizzes
- Logic Gate Quizzes
- Magnetic Field Quizzes
- Momentum Quizzes
- Motion Quizzes
- Online Physics Quizzes
- Optics Quizzes
- Physics Of Sound Quizzes
- Practice Physics Quizzes
- Properties Of Matter Quizzes
- Quantum Quizzes
- Reflection Quizzes
- Secondary 3 Physics Quizzes
- Speed Of Light Quizzes
- Thermodynamics Quizzes
- Velocity Quizzes
- Work And Energy Quizzes
Back to top