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WorksheetsOMDR
Total questions: 50
Worksheet time: 8mins
Name
Class
Date
1.
The target of the X ray tube is angulated to produce all of the following except:
a)
To decrease the effective focal spot
b)
To increase the image sharpness
c)
To energize the photons
d)
To dissipate heat
2.
Which of the following statements is false?
a)
X rays travel at the speed of 297600 km/sec
b)
X rays can be focused
c)
The nucleus of an atom contains protons and neutrons
d)
Cathode rays can be converged to a point
3.
The 'heel effect' results:
a)
In low intensity X ray beam on anode side of central ray
b)
In high intensity beam of X rays towards cathode
c)
Both of them are true
d)
None of them is true
4.
Half value layer refers to
a)
The rate at which an X ray photon transfer its energy to irradiated matter
b)
The thickness of a substance required to reduce the number of X ray photons by half
c)
The time taken for X ray photons to travel half the distance from the source to the object
d)
The heel effect seen when the anode is placed at an angle to the electron stream in the X ray cathode tube
5.
What is the function of filtration process while taking radiographs?
a)
Remove the short wavelength photons
b)
Remove the portion of long wavelength photons
c)
To increase the radiation dose to patient
d)
To increase scatter of secondary radiation
6.
When the time of exposure is doubled
a)
The velocity of photons generated is doubled
b)
The mass of photons is doubled
c)
The energy of photons is doubled
d)
The number of photons is doubled
7.
The maximum penetration among the following is seen with which ray
a)
Alpha
b)
Beta
c)
Gamma
d)
Electron beam
8.
Mathematical representation of inverse square law is:
a)
I2/I1=(D2)2/(D1)2
b)
I1/I2=(D2)2/(D1)2
c)
I2/I1=(D2)/(D1)
d)
I1/I2=(D2)/(D1)
9.
X rays are produced in:
a)
Anode
b)
Cathode
c)
Glass wall
d)
Molybdenum focusing cup
10.
Quality of the X ray beam is governed by
a)
kVp
b)
mAs
c)
Filament current
d)
Length of the X ray tube
11.
_________ is not a property of X rays
a)
Ionization
b)
Action on photographic film
c)
Excitation
d)
Collimation
12.
Reducing the size of X ray beam is achieved by
a)
Filtration
b)
Photoelectric effect
c)
Collimation
d)
Bezold-Brucke effect
13.
The wavelength of X ray photon depends upon
a)
Milliamperage
b)
Kilovoltage
c)
Distance between the source and object
d)
Quantity of electrons in the cathode stream
14.
The X ray collimators commonly used in dentistry include the following EXCEPT
a)
Diaphragm
b)
Tubular
c)
Rectangular
d)
Square
15.
A film badge is a type of
a)
Identification plate
b)
Sonometer
c)
Dosimeter
d)
Tachometer
16.
To restrict X ray beam, which of the following is done?
a)
Collimation
b)
Increase kVp
c)
Decrease target object distance
d)
Use a grid
17.
Which metal is used to remove long wave length X rays from the primary beam?
a)
Platinum
b)
Aluminium
c)
Copper
d)
Lead
18.
The speed with which the electrons travel from the filament of cathode to anode depends upon:
a)
Potential difference between the two electrodes
b)
Number of milliamperes in the tube circuit
c)
Angle between the filament and the target
d)
Exposure time
19.
The principal reason for placing an aluminium filter in the primary beam of radiation is
a)
Tube voltage(kVp)
b)
Number of milliamperes in the tube circuit
c)
Angle between the filament and the target
d)
None of the above
20.
In a patient having dense bones, penetration is best achieved by
a)
Increase in mA
b)
Increase in kVp
c)
Increased exposure time
d)
Inreased developing time
21.
The X rays which are most likely to be absorbed by the tissues and produce an injury
a)
X rays of long wavelength
b)
X rays of short wavelength
c)
Filtered X rays
d)
Central ray
22.
X rays are a type of
a)
Atomic radiation
b)
Ultrasonic radiation
c)
Electromagnetic radiation
d)
Particulate radiation
23.
X rays were discovered in
a)
. Nov 1897
b)
. Oct 1895
c)
Nov 1895
d)
Nov 1890
24.
Collimating the X ray beam reduces the formation of scattered radiation by
a)
Selective removal of soft radiation
b)
Selective removal of hard radiation
c)
Reducing the size of X ray beam
d)
Reducing the beam intensity by 50%
25.
Quantity of X-Rays can be increased by
a)
Increased milliamperage
b)
Increased time
c)
Increased kVp
d)
Both A and C
26.
Which of the following regarding Tungsten target is FALSE
a)
High thermal conductivity
b)
High atomic no.
c)
High melting point
d)
High vapor pressure
27.
Commonly used collimating device
a)
Aluminium filter
b)
Lead diaphragm
c)
Molybdenum cup
d)
Tungsten filament
28.
The inherent filtration of x ray machines range from _________ thickness of aluminium
a)
0.5-2 mm
b)
1.5-2.5 mm
c)
2.5-5 mm
d)
1.0-2.5 mm
29.
Rotating anode is mainly used to
a)
Focus photons
b)
To avoid heel effect
c)
To dissipate heat from focal spot
d)
Increase the energy of photons
30.
The size of actual focal spot is
a)
1*3 mm
b)
1*1 mm
c)
1*4 mm
d)
1*2 mm
31.
Which one of the following has the maximum ionization potential?
a)
Electron
b)
Proton
c)
Helium ion
d)
Gamma photon
32.
Which of the following factors does not control the X-ray beam
a)
Exposure time
b)
mA
c)
kVp
d)
Range of energy of photons
33.
The conversion of kinetic energy to X ray energy by the deceleration of a fast moving electron produces
a)
Bremsstrahlung radiation
b)
Characteristic radiation
c)
Particulate radiation
d)
Orbital radiation
34.
The milliamperage affects the
a)
Speed at which electrons move from cathode to anode
b)
Cooling of the target
c)
Heating the filament
d)
Penetrating ability of X rays produced
35.
The term used to designate a single unit of electromagnetic radiation is:
a)
Quanta
b)
Photon
c)
both A&C
d)
None of the above
36.
Penetration power is more for
a)
Hard X rays
b)
Soft X rays
c)
X rays with long wavelength
d)
Grenz rays
37.
The following is not an ionizing radiation
a)
MRI
b)
CT
c)
USG
d)
Both A and C
38.
Unit of radiation exposure is
a)
Rad
b)
Roentgen
c)
rem
d)
Sievert
39.
Which of the following is true
a)
Cathode is negatively charged
b)
cathode is positively charged
c)
anode emits electrons
d)
anode is connected to step down transformer
40.
Consistent radiographs require
a)
Long cone technique
b)
Fixed kVp and mA
c)
Automatic processing
d)
Proper developing
41.
LASER is used for treatment of
a)
Aphthous ulcers
b)
High frenal attachment
c)
TMDs
d)
All of the above
42.
The fundamental particle present in protons is
a)
Boson
b)
Lepton
c)
Neutrino
d)
Quark
43.
Rectangular collimation is better than circular collimation. Out of filtration and collimation, only filtration is a measure of radiation protection.
a)
First statement is false. Second is true
b)
First statement is true. Second statement is false.
c)
Both statements are true
d)
Both statements are false
44.
Size of focal spot influences radiographic
a)
Definition
b)
Density
c)
Contrast
d)
All of the above
45.
Which one of the following is a type of electromagnetic radiation?
a)
Alpha rays
b)
Beta rays
c)
X rays
d)
Cathode rays
46.
Effective dose in radiation at 2 m is 1 Gray. At 1 m, it will be
a)
0.25
b)
0.5
c)
2
d)
4
47.
Among the following, example of non-ionising radiation is
a)
UV rays
b)
X rays
c)
Gamma rays
d)
Cosmic rays
48.
Which of the following is false?
a)
Tungsten target is set in a copper block
b)
Dental X ray tube is self rectified
c)
Filtration reduces the exposure time
d)
Grid reduces the secondary radiation reaching the film
49.
During the production of X rays, how much of electron energy is converted into heat?
a)
0.99
b)
0.94
c)
0.89
d)
0.84
50.
The unit of measurement of absorbed dose in X ray is
a)
Curie
b)
Sievert
c)
Gray
d)
Kerma
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