Radiation Physics Quiz Question & Answers

Radiation Physics Quiz Question & Answers (Question Bank) Free Online Test For Medical Students like PG, PHD, Specialist exam entrance.

We have put total 50 Objective Type Question Answers on Radiation Physics, you can practice these question answers for free. Well you can also check list of Online Medical Entrance Mock Test / Quiz question comes from different areas on Medical.

This Radiation Physics Quiz questions answers are applicable for any kind of Medical PG Entrance exam or job related exam especially for PHD, MD, MS, M.Ch., D.M, Medical Students. You can practice as much as you can to gather knowledge of how to answers Radiation Physics Quiz, each question having four alternate answers, once you select one answers of Radiation Physics Quiz, system will show you whether its correct or not.



Radiation Physics Quiz Question & Answers (Total 50 MCQs)

Radiation Physics Online Mock Test (high Level)

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Question 1
Regarding moving grids, all are true except:
A
Blur out shadows cast by lead strips
B
Increases patient dose
C
Decreses grid cutoff
D
Subject to failure
Question 2
Examples of non-stochastic effects are all, except:
A
Cataracts
B
Leukemia
C
Diarrhea
D
Bone marrow depression
Question 3
All of the following are systemic radionuclide, except:
A
P-32
B
Strontium -89
C
Chromium-24
D
Samarium-153
Question 4
Subject contrast depends on all, except:
A
Linear attenuation coefficient.
B
Contrast medium given.
C
Film processing conditions.
D
Scatter.
Question 5
Which of the following is a directly ionizing?
A
Alpha rays
B
X-rays
C
Gamma Rays
D
Neutrons
Question 6
10 20 29Does in spot image in fluoroscopy is approximately: (uGy/frame)
A
2
B
10
C
20
D
29
Question 7
Which of the following is incorrectly matched? A) Radionuclide       Half life Iodine-131 8 days B) Radionuclide Half life Technetium-99 1 year C)  Radionuclide Half life Krypton-81m 13 seconds D)   Radionuclide Half life Thallium-201 73 hours
A
A
B
B
C
C
D
D
Question 8
Magnification in radiography, all of the following is true, except?
A
Reduced by increasing film focus distance (FFD)
B
Reduced by increasing object film distance
C
Is propotional to relative length of image to object
D
Distortion increases by magnification increase
Question 9
Regarding image intensifier, which of the following is true:
A
Output phosphor is smaller than the input phosphor
B
Output phosphor is made of zinc alumnium sulphate
C
Output phosphor converts incident light into electrons.
D
Thickness of outer phosphor is about 10 mm
Question 10
Linear attenuation coefficient depends on all except-
A
Density of the material
B
Photon energy (kV)
C
Atomic number (Z)
D
Physical state of matter
Question 11
Correct X-ray tube voltage range of mammography:
A
25-34 kV
B
42-47 kV
C
65-78 kV
D
90-95 kV
Question 12
Regarding dose, all are true, except:
A
Absorbed dose is measured is Sieverts
B
Equivalent dose is measured in Sieverts
C
KERMA is measured in Gray
D
1Gy = 1J/kg
Question 13
Calcification in mammograms are visible because of their:
A
Atomic number
B
Physical density
C
Electron density
D
Linear thickness
Question 14
Which of the following statement is false?
A
Orthovoltage or deep therapy is the treatment with x rays ranging from 150 to 500 kV.
B
X ray beams of energy 1 MV or greater can be classified as megavoltage beam.
C
A contact therapy machine usually operates at a potential of 450-660 kV.
D
Superficial therapy applies to the treatment with X rays from 50-150 kV.
Question 15
Regarding TLD (Thermo Luminescent dosimeters) true is:
A
Used for whole body dosage
B
Cannot be reduced
C
Permanent records achieved
D
Use lithium fluoride as active ingredient
Question 16
All are true about filters used in radiography, except:
A
They reduce the mean energy of the beam
B
Removes low energy photons
C
Glass of the tube also acts like a filter
D
K edge can be sometimes used in mammography
Question 17
Regarding Compton scatter, all correct except:
A
Energy of photon is reduced gradually
B
90 degree scatter photon has a higher energy than a 60 degree scatter photon
C
Direction of scattered photons depends on energy of incident photon
D
The energy of scattered photon depends on the energy of incident photon.
Question 18
Which statement is incorrect:
A
The characteristic curve of the film is a plot of optical density against the log of dose to the film
B
Film latitude is the range of film exposures that produce optical densities in the useful range of the film.
C
Intensifying screens convert the light rays into x rays.
D
Contrast is directly related to gamma.
Question 19
The relative cancer radio sensitivity of a child compared to a 70 years old is most likely:
A
1:1
B
100:1
C
3:1
D
10:1
Question 20
Which is incorrect regarding grids?
A
Grids are stationary as well as moving.
B
The larger the grid ratio, the more efficient the grid is in absorbing scatter radiations..
C
Contrast improvement factor of the grids is defined as contrast with a grid divided by contrast without a grid.
D
Grids are frequently used in children and in extermities as they reduce the dose.
Question 21
True about vigneting are all except:
A
Decreases with flattening of input screen
B
Centrally dark
C
Can be minimized by strict quality control
D
Periphery is darker and magnified
Question 22
About an X-ray film, which of the following is correct?
A
Aging increases base +fog level
B
Base + fog level is independent of temperature
C
Film is insensitive to chemicals
D
Base + fog is independent of development of film
Question 23
Conformation radiotherapy uses:
A
Multileaf collimator
B
Single leaf collimator
C
Cylinders
D
Cones
Question 24
Regarding film badges dose-meters used in radiology, false statement is:
A
Has multiple filters for different radiations
B
Processed six monthly
C
Can identify the type of radiation exposure
D
Effect by change in temperature and humidity.
Question 25
t 1/2 or the half life of cobalt- 60 is:
A
2.6 years
B
5.2 years
C
8 years
D
25 years
Question 26
Film contrast depends on all, except:
A
Film gamma
B
Use of screen
C
Film density
D
Thickness of the tissue.
Question 27
Regarding the use of Tungsten as a target in an X ray tube all of the following statements are correct, except:
A
It has high melting point
B
High vapour pressure
C
High thermal conductivity.
D
High atomic number.
Question 28
As per ICRU recommendation, an overall accuracy of ...........(in percent) for dose delivery computation in Radiotherapy is needed for tumor dose delivery:
A
+/-5
B
+/-15
C
+/-25
D
+/-48
Question 29
True about Tc 99m are all, except:
A
Produced in a nuclear reactor
B
It has a very long biological half-life.
C
Involved in isomeric transition
D
Most commonly used isotope medically.
Question 30
Advantages of increasing generator voltage to X- ray tube are all except:
A
Increase Xray output per mAs
B
Harder beam
C
Reduces patient dose
D
Reduces film blackening
Question 31
An air kerma of 1mGy will most likely result in a skin dose of (mGy):
A
1.5
B
3
C
10
D
12
Question 32
Following information is derived from a characteristic curve except:
A
Intensification factor
B
Film gamma
C
Exposure latitude
D
Spatial resolution
Question 33
True about isotopes is:
A
Isotopes have same atomic number (Z)
B
Isotopes have same mass number (A)
C
Isotopes have same physical property
D
Isotopes have same density
Question 34
Which os the following is false:
A
Resolution of a CR system is approximately 3.5-5.5 line pairs/mm
B
Fourier analysis is technique of representing an image by a series of cos waves.
C
A digital image is stored as a matrix of pixels having values in binary notations
D
CR is a method of image capture based on photostimulable phosphor plates.
Question 35
Characteristic curve, all are true except:
A
Film gamma is the average slope of the characteristic curve
B
Speed can be defined as the exposure required producing a net density of 1
C
Sensitometer is an instrument that can be used to derive the characteristic curve
D
It is the curve between log exposure and optical density.
Question 36
Commonly used protective devices in the radiography rooms are made of:
A
Silver
B
Tungsten
C
Lead
D
Molybdenum
Question 37
True about X rays are all, except:
A
X rays are electromagnetic radiations
B
X- rays have a velocity of sound
C
Produced by stopping high energy electrons in a tungsten target
D
Intensity falls off in accordance with the inverse square law.
Question 38
Which os the following is correctly matched? A)   Site  Agent           Effective dose (mSv) Bone Tc-99m diphosphonates 30 B)   Site   Agent            Effective dose (mSv) Kidney Tc-99m MAG3 18 C)   Site    Agent         Effective dose (mSv) Brain Flourine-18 FDG 8 D)  Site     Agent         Effective dose (mSv) Thyroid I-123 iodide 29
A
A
B
B
C
C
D
D
Question 39
Phosphorus 32 emits:
A
Beta Particles
B
Alpha Particles
C
Neutrons
D
X rays
Question 40
Ways to improve contrast in tissue are all, except:
A
Reduce kV
B
Increase mA
C
Use grids
D
Contrast media
Question 41
In general radiography, filters are used which are commonly made of:
A
Selenium
B
Molybdenum
C
Nickel
D
Aluminum
Question 42
Regarding photoelectric effect, false statement is:
A
Photon disappears completely
B
Produces ionized atom
C
Interaction between photon and bound electron
D
Decrease with increase in density
Question 43
If the skin dose in a lateral abdominal radiograph is 100%, the embryo dose(%) is most likely
A
1
B
5
C
50
D
65
Question 44
Which of the following is false?
A
Neutrons have 0 charges and 1 relative mass
B
Protons have +1charge and relative mass 1
C
Alpha particles are having +4 charge and relative mass of 2
D
Electrons have negative charge of -1
Question 45
Regarding quantum mottle, true statement is:
A
Random pattern of photons on X ray film.
B
Less with high kV energies
C
Less with use of filters
D
Larger the number of photons absorbed, more is the noise.
Question 46
Radioactivee cobalt emits:
A
Alpha rays
B
Gamma rays
C
Neutrons
D
Beta rays
Question 47
True about intensity modulated radiation therapy are all, except:
A
The radiation dose is designed to conform to the 3D shape of tumors
B
It has potential to reduce treatment toxicity.
C
It is used for the treatment of prostate cancer but never for thyroid and breast malignancies
D
It is beneficial in treatment of some pediatric malignancies.
Question 48
Which radiation induced cancers have the shortest latency period in exposed adults?
A
Breast
B
Colon
C
Leukemia
D
Stomach
Question 49
False regarding effective doses is:-
A
CT heads- 2mSv
B
CT throax- 18 mSv
C
CT abdomen- 10 mSv
D
Chest xray PA view - 0.02mSv
Question 50
Regarding planned radiation volume, true statement is:
A
Depends upon the 90% of the tumor size.
B
Less than target radiation volume.
C
More than target radiation volume.
D
Equal to the target radiation volume.
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