WorksheetsP13: L5 - X-Rays in Medicine
Total questions: 15
Worksheet time: 9mins
Which of these is NOT true about the x-ray tube for production of x-ray?
a vacuumed glass tube is used to prevent electron from hitting the air molecules.
the cathode consists of heated filament with high ionization energy.
cooling system is required at the anode metal target in order to prevent the metal from melting
the metal target of anode should be metal with high melting point.
Which one of these images is an X - Ray?
What are X - Rays used for?
Scanning Luggage
Broken Bones
Checking to see if your shoelaces are untied
Checking for cavities
What disease can an X - Ray cause?
Dyslexia
Cancer
Diabetes
Polio
X - Rays use ___________ radiation
Cosmic
Electromagnetic
Neutron
Alpha
Who performs an X - ray?
Cardiologist
Radiologist
Ophthalmologist
Biologist
When x-rays strike a patient tissues, ionization occurs.
True
False
When should the dental assistant hold the film in the patient's mouth during exposure?
For young children
for patients with disabilites
for edentulous patients when the exposure time is less
never
Who is responsible when prescribing x-rays?
Dental assistant
Dentist
Dental hygienist
How far away do you need to be from an x-ray machine?
4 feet
6 feet
8 feet
2 feet
Figure shows two pulses on a CRO. The pulses are caused by two consecutive signals detected by a microphone connected to the CRO.
Calculate the time lapse between the signals if the timebase setting is 4 ms cm -1.
1.208 second
0.1208 second
0.00208 second
0.0208 second
Diagram shows a waveform displayed on the screen of a cathode ray oscilloscope (C.R.O.). Which of the following control switch needs to be switched on to display this waveform?
intensity
time-base
Y-gain
Y-shift
Diagram shows the trace displayed on the screen of a C.R.O. with the time-base set to 10 ms/div. What is the frequency, f of the wave?
5 Hz
25 Hz
40 Hz
50 Hz
Diagram shows a waveform displayed on the screen of a C.R.O. If the controls on the C.R.O. are set at 0.5 V/div and 2 ms/div, find the peak voltage and the frequency of the input signal.
4 V, 2 Hz
5 V, 10 Hz
2 V, 100 Hz
4 V, 100 Hz
