Radiation Physics Quiz Question & Answers

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

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 2

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 3

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 4

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 5

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 6

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 7

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 8

Conformation radiotherapy uses:

A	Multileaf collimator
B	Single leaf collimator
C	Cylinders
D	Cones

Question 9

Ways to improve contrast in tissue are all, except:

A	Reduce kV
B	Increase mA
C	Use grids
D	Contrast media

Question 10

All of the following are systemic radionuclide, except:

A	P-32
B	Strontium -89
C	Chromium-24
D	Samarium-153

Question 11

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 12

Phosphorus 32 emits:

A	Beta Particles
B	Alpha Particles
C	Neutrons
D	X rays

Question 13

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 14

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 15

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 16

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 17

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 18

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 19

In general radiography, filters are used which are commonly made of:

A	Selenium
B	Molybdenum
C	Nickel
D	Aluminum

Question 20

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.

Question 21

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 22

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 23

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 24

Film contrast depends on all, except:

A	Film gamma
B	Use of screen
C	Film density
D	Thickness of the tissue.

Question 25

Calcification in mammograms are visible because of their:

A	Atomic number
B	Physical density
C	Electron density
D	Linear thickness

Question 26

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 27

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 28

Radioactivee cobalt emits:

A	Alpha rays
B	Gamma rays
C	Neutrons
D	Beta rays

Question 29

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 30

Following information is derived from a characteristic curve except:

A	Intensification factor
B	Film gamma
C	Exposure latitude
D	Spatial resolution

Question 31

Which radiation induced cancers have the shortest latency period in exposed adults?

A	Breast
B	Colon
C	Leukemia
D	Stomach

Question 32

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 33

Commonly used protective devices in the radiography rooms are made of:

A	Silver
B	Tungsten
C	Lead
D	Molybdenum

Question 34

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 35

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 36

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 37

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 38

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 39

Subject contrast depends on all, except:

A	Linear attenuation coefficient.
B	Contrast medium given.
C	Film processing conditions.
D	Scatter.

Question 40

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 41

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 42

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 43

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 44

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 45

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 46

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 47

Which of the following is a directly ionizing?

A	Alpha rays
B	X-rays
C	Gamma Rays
D	Neutrons

Question 48

Examples of non-stochastic effects are all, except:

A	Cataracts
B	Leukemia
C	Diarrhea
D	Bone marrow depression

Question 49

10 20 29Does in spot image in fluoroscopy is approximately: (uGy/frame)

A	2
B	10
C	20
D	29

Question 50

Correct X-ray tube voltage range of mammography:

A	25-34 kV
B	42-47 kV
C	65-78 kV
D	90-95 kV

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Radiation Physics Quiz Question & Answers

Radiation Physics Online Mock Test (high Level)

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