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