Radiotherapy Technologist Questions and Answers | MCQ

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Radiotherapy Technologist Model Questions and Answers

1) The smallest subdivision of an element is known as
A) Molecule
B) Atom
C) Proton
D) Electron

2) The unit of Power is:
A) Joule
B) Coulomb
C) Watt
D) Farad

3) Alpha and Beta radiation belongs to the category of
A) Particle radiation
B) Electromagnetic radiation
C) Light radiation
D) None

4) The principle on which most of the transformer works is
A) Mutual induction
B) Self-induction
C) Electrostatic induction
D) Conservation of energy

5) The process by which AC is converted to DC is termed as
A) Transformation
B) Rectification
C) Thermionic emission
D) Generator

6) The power loss in a transformer caused due to heat production within the core is called
A) Cable loss
B) Eddy current
C) Hysteresis
D) all of above

7) Thyratron, A gas filled triode acts as
A) Rectifier
B) Electronic switch
C) heater to filament
D) None

8) In linear accelerator isotope used is
A) Co-60
B) lr-192
C) Cs-137
D) none

9) When a projectile electron interacts with an inner shell electron of target atom the
A) X-ray are produced
B) Characteristic radiation is produced
C) Bremsstrahlung radiation is produced
D) All of the above

10) SI units for quantification of radiation is (are)
A) Gray
B) C/Kg, Gray, Sievert and Bq
C) Gray, Sievert
D) Roentgen and Sievert

11) Cesium-137 source decays with a half-life of 30 years. It will decay by about 2% in how much time?
A) 3 days
B) 1 month
C) 6 month
D) 1 year

12) The decay of 27CO60 to 28Ni60 is an example of which decay process?
A) Nuclear Fission
B) Electron capture
C) Internal conversion
D) β decay

13) Which factor will impact the focal spot size of an X-ray tube?
A) Anode angle
B) Anode material
C) Kvp
D) mAs

14) The average energy of the photon beam from an x-ray tube can be increased by
A) increasing tube current
B) Increasing tube voltage
C) Increasing filament current
D) increasing filament voltage

15) Which X-ray generator will require the highest mAs, given the same patient thickness and Kvp, setting?
A) Three Phase
B) High frequency
C) Half wave rectified
D) Full wave rectified

16) Which of the following Linac Components require to be cooled?
A) Klystron or Magnetron
B) Focusing coil
C) Wave Guides
D) Transformer

17) Remote control after loading system delivers
A) High dose to staff
B) High dose to Patients
C) Less dose to staff
D) Both b & c

18) Bragg peak is exhibited by
A) Neutrons
B) Protons
C) X-rays
D) Gamma rays

19) Photoelectric cross section varies with the photon energy E and atomic number Z of the absorber as:
A) 1/E3
B) Z3
C) 1/Z
D) A and B

20) A 14 MeV neutron collides “head on” with a hydrogen nucleus. The kinetic energy of the recoil proton will be?
A) 14 MeV
B) 7 MeV
C) 1.02 MeV
D) 1.4 MeV

21) Which is the following interaction processes is most likely for a 10 KeV photon in water?
A) Photoelectric effect
B) Compton effect
C) Pair production
D) Rayleight scattering

22) A high energy positron can undergo which of the following interactions as it traverses matter?
A) ionization and Excitation
B) Bremsstrahlung
C) Coulomb Scattering
D) All

23) The threshold energy for a photon to interact by pair production is?
A) 0.511 MeV
B) 1.022 MeV
C) 2.044 MeV
D) 2 MeV

24) Detector used in new generation CT scanners is:
A) Sodium Iodide Crystal
B) Scintillation detectors
C) Gas detectors
D) Solid state detectors

25) The CT number for dense 1bone tissue is:
A) O
B) -100
C) 1000
D) -1000

26) For designing the room for MRI one should use:
A) PVC reinforcing rods
B) Iron reinforcing bars
C) Magnetic Material
D) All of the above

27) The static magnetic field strength is measured in:
A) Hertz
B) Tesla
C) Tesla/Sec
D) Watts/Kg

28) The time required for interaction between nuclear spins and tissue lattice to return to normal following RF exaction is called:
A) T1 relaxation time
B) T2 relaxation time
C) Magnetic movement
D) Spin density

29) The body section radiography is also known as:
A) Tomography
B) Straitography
C) Laminography
D) all of the above

30) The CT scan acquires images in
A) Sagital section
B) Coronal section
C) Both Sagital and coronal sections
D) Axial section

31) The depth of maximum dose in a mega voltage beam:
A) Does not depend on beam energy
B) increases with beam energy
C) Increases with dose rate
D) Decreases with beam energy

32) Dose distribution outside the field boundaries is significantly affected by:
A) Flattering filter
B) Dmax
C) Geometric penumbra
D) Scattering foil

33) Calculate the optimal wedge angle for a wedged-pair plan with beams directed at 60° from one another:
A) 15°
B) 30°
C) 45°
D) 60°

34) According to ICRU specifications, the wedge angle is defined at:
A) Depth of 50% isodose line
B) Depth of 80% isodose line
C) Depth of Dmax
D) 10 cm. depth

35) In kilovoltage cone-beam CT, CT numbers for all materials are proportional to:
A) Mass density
B) Attenuation coefficients
C) Neutron number
D) Volume density

36) Which of the following detectors require corrections in measuring PDD in electron beam?
A) ion chamber
B) Film
C) TLD chips
D) all of the above

37) The minimum thickness of lead required to stop 15 MeV electron beam is approximately:
A) 2mm
B) 4mm
C) 8mm
D) 11mm

38) Which of the following is best described as a stochastic event?
A) Epilation
B) lense opacification
C) Tissue necrosis
D) None of the above

39) According to the AAPM TG-40 recommendations, the X-ray output consistency check for Linac should be performed:
A) Daily
B) twice a week
C) once a week
D) once a month

40) In IMRT, the relative contribution to the target dose from collimator transmission scatter is greatest for:
A) Leaf transmission
B) Round leaf transmission
C) X-ray jaws
D) overall head scatter

41) The typical average value of leakage dose from the MLC relative to the primary dose approximately:
A) 0.1%
B) 1%
C) 2%
D) 5%

42) The term “step-and-shoot” is sometimes used to describe which IMRT delivery technique?
A) Dynamic MLC-IMRT
B) Segmental-M LC-IMRT
D) Serial Tomography

43) Half-life of Co-60 is
A) 5.27 yrs
B) 5.3days
C) 30 yrs
D) 1.25 Mev

44) Acceptable detectors for the measurement of small field (i.e.,<5mm) output factors used in SRS includes:
A) Farmer type ion chamber
B) Diodes
C) Fricke dosimetry
D) Parallel plate ion chamber

45) Which disease(s)/disease site(s) is/are treated with SRS:
A) Maxillary Sinus
B) Glioma
C) Orbit
D) Hodgkin’s lymphoma

46) According to ICRU, HDR brachytherapy is classified as brachytherapy with a prescribed dose rate of:
A) 2 cGy/min or higher
B) 6 cGy/min or higher
C) 12 cGy/min or higher
D) 40 cGy/min or higher

47) Which site is not treated with HDR Brachytherapy?
A) Lung Cancer
B) Esophageal Cancer
C) Pituitary Adenoma
D) Cervical cancer

48) The dose rate constant A of a brachytherapy source do not depends on:
A) Photon energy emitted
B) Exposure rate constant of the source
C) Source construction
D) Source position

49) Which critical structures is/are of most concern for permanent prostate implants?
A) Small bowel
B) Urethra
C) femoral head
D) All

50) HVT means
A) Heavy volume thickness
B) half value thickness
C) Heat volume thickness
D) None of the above

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