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.
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Radiation Physics Quiz Question & Answers (Total 50 MCQs)
Radiation Physics Online Mock Test (high Level)
Question 1 |
CT heads- 2mSv | |
CT throax- 18 mSv | |
CT abdomen- 10 mSv | |
Chest xray PA view - 0.02mSv |
Question 2 |
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 3 |
Silver | |
Tungsten | |
Lead | |
Molybdenum |
Question 4 |
1 | |
5 | |
50 | |
65 |
Question 5 |
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 6 |
Used for whole body dosage | |
Cannot be reduced | |
Permanent records achieved | |
Use lithium fluoride as active ingredient |
Question 7 |
A | |
B | |
C | |
D |
Question 8 |
Has multiple filters for different radiations | |
Processed six monthly | |
Can identify the type of radiation exposure | |
Effect by change in temperature and humidity. |
Question 9 |
Produced in a nuclear reactor | |
It has a very long biological half-life. | |
Involved in isomeric transition | |
Most commonly used isotope medically. |
Question 10 |
Breast | |
Colon | |
Leukemia | |
Stomach |
Question 11 |
Intensification factor | |
Film gamma | |
Exposure latitude | |
Spatial resolution |
Question 12 |
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 13 |
A | |
B | |
C | |
D |
Question 14 |
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 15 |
Linear attenuation coefficient. | |
Contrast medium given. | |
Film processing conditions. | |
Scatter. |
Question 16 |
Blur out shadows cast by lead strips | |
Increases patient dose | |
Decreses grid cutoff | |
Subject to failure |
Question 17 |
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 18 |
25-34 kV | |
42-47 kV | |
65-78 kV | |
90-95 kV |
Question 19 |
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 20 |
Selenium | |
Molybdenum | |
Nickel | |
Aluminum |
Question 21 |
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 22 |
1:1 | |
100:1 | |
3:1 | |
10:1 |
Question 23 |
Atomic number | |
Physical density | |
Electron density | |
Linear thickness |
Question 24 |
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 25 |
Increase Xray output per mAs | |
Harder beam | |
Reduces patient dose | |
Reduces film blackening |
Question 26 |
Absorbed dose is measured is Sieverts | |
Equivalent dose is measured in Sieverts | |
KERMA is measured in Gray | |
1Gy = 1J/kg |
Question 27 |
Beta Particles | |
Alpha Particles | |
Neutrons | |
X rays |
Question 28 |
It has high melting point | |
High vapour pressure | |
High thermal conductivity. | |
High atomic number. |
Question 29 |
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 30 |
Isotopes have same atomic number (Z) | |
Isotopes have same mass number (A) | |
Isotopes have same physical property | |
Isotopes have same density |
Question 31 |
2 | |
10 | |
20 | |
29 |
Question 32 |
P-32 | |
Strontium -89 | |
Chromium-24 | |
Samarium-153 |
Question 33 |
Photon disappears completely | |
Produces ionized atom | |
Interaction between photon and bound electron | |
Decrease with increase in density |
Question 34 |
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 35 |
1.5 | |
3 | |
10 | |
12 |
Question 36 |
+/-5 | |
+/-15 | |
+/-25 | |
+/-48 |
Question 37 |
Film gamma | |
Use of screen | |
Film density | |
Thickness of the tissue. |
Question 38 |
Alpha rays | |
Gamma rays | |
Neutrons | |
Beta rays |
Question 39 |
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 40 |
Decreases with flattening of input screen | |
Centrally dark | |
Can be minimized by strict quality control | |
Periphery is darker and magnified |
Question 41 |
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 42 |
2.6 years | |
5.2 years | |
8 years | |
25 years |
Question 43 |
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 44 |
Alpha rays | |
X-rays | |
Gamma Rays | |
Neutrons |
Question 45 |
Reduce kV | |
Increase mA | |
Use grids | |
Contrast media |
Question 46 |
Multileaf collimator | |
Single leaf collimator | |
Cylinders | |
Cones |
Question 47 |
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 48 |
Cataracts | |
Leukemia | |
Diarrhea | |
Bone marrow depression |
Question 49 |
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 50 |
Density of the material | |
Photon energy (kV) | |
Atomic number (Z) | |
Physical state of matter |
List |