Radiophysics MCQ for Radiographer
1Q.X-ray discovered by W C Roentgen in
A. 1886
B. 1895
C.1905
D. 1876
2Q .Best Radiographic view for fracture in the scaphoid bone
A. AP
B. LAT
C. Oblique
D. None
3Q. X-Rays are
A. Electrons
B.Neutrons
C. Protons
D. Electromagnetic waves
4.Q. X-Rays are formed when elections hit on
A. Water
B.Heat
C. Anode
D. None
5Q. Speed of X-Ray is equal to
A. Speed of light
B.Speed of electrons
C.Tube voltage
D. None
6Q. Contrast in X-rays depends upon
A. kV
B.mA
C.Second
D. Duration of exposure
7Q. Acute pancreatitis is best diagnosed by
A. MRI
B. CECT
C. NCCT
D. USE
8Q. Radiation is not used in
A. USG
B.CT SCAN
C. MRI
D.BOTH A & C
9Q. Investigation of choice for a pregnant lady with upper abdominal mass
A. Barium meal
B. CT SCAN
C. MRI
D. ULTRASOUND
10Q. Radio activity discovered by
A. 1796
B. 1896
C.1901
D. 1946
11Q. 1 gray of radiation is equal to
A. 1 RAD
B.10 RAD
C.100 RAD
D.1000 RAD
12Q.If X-Ray pass through matter, it’s the intensity
A. Increase
B.Decrease
C. Remains constant
D. May increase or decrease depending on the object.
13Q. X-ray has
A. Short wavelength
B. High frequency
C. Both A and B
D. Longest wavelength
14Q. Electron was discovered by
A. J.J Thomson
B. James Chadwick
C. Goldstein
D. Rutherford
15Q. Proton was discovered by
A. J J Thomson
B. James Chadwick
C. Goldstein
D. Rutherford
16Q. Neutron was discovered by
A. J J Thomson
B. James Chadwick
C. Goldstein
D. Rutherford
17Q .Radioactivity was discovered by
A. Marie Curie
B. Rutherford
C. Fermi
D. Henri Becquerel
18Q .C T scan discovered by
A. Housenfield
B. Storz
C. Rutherford
D. Purcell
19Q. Half-life of I -131 is
A. 8 hours
B. 2 days
C. 8 days
D. 12 days
Q20.The target material of the X-ray tube is
A. Lead
B.Tungsten
C.Cobalt
D. Copper
Q21. Xeroradiography is used in
A. Stomach
B.Liver
C. Breast
D.All
Q22. The least radiosensitive tissue is
A. Nervous
B.Bone
C. Kidney
D. Thyroid
23Q.Use of filters result
A. Softer beam radiation
B.Wide beam coverage
C.Less penetrating beam
D. Beam of greater intensity
24Q. The most common examination performed in an X-ray department is
A. Lumber spine X-ray
B. Abdominal X-ray
C. Chest X-ray
D. Foot X-ray
25 Q.What is the tomographic X-Ray of the teeth, mandible, and maxilla?
A. OPG
B. IVP
C.TMJ
D. OM
26Q. Motion artifact is most common in
A. CT scan
B. MRI
C. Ultrasound
D. All of the above
27. Ring artifact occurs in
A. CT Scan
B. MRI
C. Ultrasound
D. All of the above
28Q. Collimators are used to
A. Reduce the radiation beam speed
B.Reduce the radiation wavelength
C. Increase film latitude
D Decrease film latitude
29Q. X-ray and Gamma-ray are a form of
A. Light
B.Particle radiation
C. Electromagnetic radiation
D.Both B & C
30 Q. Unexposed X-ray film coated with an emulsion containing radiation-sensitive particles known as
A. Metallic silver crystals
B. Silver halide
C .Both A & B
D.Neither A & B
31Q. The X-Ray envelop of x-ray tube is made of
A. Pyrex/perspex glass
B. Aluminium
C.Lead
D. Borosilicate glass
Q32.TLD CARD sent to which place for the analysis?
A . BARC MUMBAI
B.ISRO
C. ULTRA TECH LAB
S. FRRO
Q33.Which material is used for radiation protection
A. Rubber
B. Aluminium
C. Tin
D. Lead
Q 34. What is the annual effective dose limit for occupational?
A. 20 mSv
B. 50 mSv
C. 100 mSv
D. 500 mSv
Q35.Normal body temperature is
A. 32°C
B. 37 °C
C. 27 °C
D. 40°C
Q36. KUB stands for
A. Kidney
B. Kidney under the bladder
C. Kidney Ureter bladder
D. Kidney Uterus bladder
Q37. MRI stands for
A. Nuclear Magnetic Resonance
B. Magnetic Resonance Imaging
C. Magnetic Resistance Items
D. Magnetic Trasfer Imaging
Q38. Darkroom should have
A. 1 type of illumination
B. 2 type of illumination
C. 3 Type of illumination
D. None of these
39. What does the terms R/ hr
A. Radiation limits for humans
B. Roentgen/ hr
C. X-Ray/ hr
D. Radiation bin hydrogen
40. Magnetic field Strength measured by
A. Hertz
B. Tesla
C.Tesla/ sec
D. Watts/ Kg
• X-Ray sources – X-Ray is produced by an X-ray tube, there are three main parts of an X-Ray tube – the cathode, the anode, and the filament. When the cathode filament is heated electrons are ejected from its surface towards the anode target, and electrons heating the anode target, produce Bremsstrahlung radiation which why 1 % X-Ray is produced and 99 % heat is generated.
In CT scan –
• The smaller the interslice distance or pitch factor, the higher both the local dose and integral dose of the patient.
• The larger the slice thickness the greater the low contrast resolution in the image
• the smaller the slice thickness the greater the special resolution.
•If the slice thickness is large the images can be affected by artifact due to partial volume effects.
•If the slice thickness is small(1/2mm) the images may be significantly affected by noise.
•Interslice distance is defined as the coach increment between two factors.
• In helical CT scan the pitch factor is the ratio of the couch increment fer rotation to the slice thickness at the axis of rotation.
Other facts-
•All the images and radiographs are larger than the object they represent. This means the object is in a large disease called magnification.
•Unequel magnification of a different portion of the same object is called distortion.
• Grid ratio of the ratio of the height of the Lead strip and the distance between them. Grid ratio is a parameter widely used to express a grid’s ability to remove scattered radiation.
(Grid ratio = height/ distance)
• Most modern systems use tubes with two focal sports. A small spot is used for high-resolution examination and a large spot is used for large anatomical coverage.
•Boro silicate glass envelope in x-ray tube generally used, also known pyrex glass.
• in general the thickness of the emulsion the more sensitive the film. (emulsion is a silver halide coated on the unexposed X-ray film)
• The double-coated film helps in getting better density and contrast and also reduces the exposure required. this also is help in avoiding curling the film.
•Those x-ray photons that pass through the body without interacting produce the X-ray image.
•Producing a high-quality radiograph requires the proper selection of KVp and mAs so that the effective x-ray energy results in maximum differential absorption.
- Attenuation- reduction of the radiation intensity upon passes through matter resulting from all types of interaction.
