Best Radiology MCQs Part 8.
These Best Radiology MCQs Part 8 cover a wide range of topic related to radiology , making them essential tool for anyone preparing for radiology exams or seeking to deepen their knowledge in the field.
1. Which of the following is not considered a force?
A. Electrostatic
B. Strong
C. Gravity
D. Electricity
ANS:- D
2. Which of the following is not a unit of energy?
A. Erg
B. Joule
C. Watt
D. Calorie
ANS:-C
3. Which of the following would most likely be attracted to an anode?
A. Proton
B. Neutron
C. Electron
D. Positron
ANS:- C
4. Which quantity is the best measure of power?
A. Joule
B. Tesla
C. Watt
D. Coulomb
ANS:- C
5. Which of the following is/are likely to have the longest wavelength?
A. Gamma rays
B. Microwaves
C. Radio waves
D. Ultraviolet
ANS:- C
6. For electromagnetic radiation, which increases with increasing photon energy?
A. Wavelength
B. Frequency
C. Velocity
D. Charge
ANS:- B
7. If the distance from a radiation source is halved, the radiation intensity increases by a factor of:
A. 2−2
B. 2−1
C. 20
D. 2+2
ANS:- D
8. X-ray generators have a power level (kW) of approximately:
A. 1
B. 10
C. 100
D. 1,000
ANS:- C
9. Which of the following is not a type of x-ray generator?
A. Single phase
B. Double phase
C. Six pulse
D. High frequency
ANS:- B
10. The purpose of x-ray transformers is most likely to change the:
A. Magnetic field
B. Electrical voltage
C. Power level
D. Waveform frequency
ANS:- B
11 When a secondary coil has 500 more turns than a primary coil, the ratio of the secondary voltage to the primary voltage is most likely:
A. 500
B. 5000.5
C. 1/500
D. 1/5000.5
ANS:- A
12 Which of the following generators is likely to have the largest waveform ripple?
A. Constant potential
B. High frequency
C. Single phase
D. Six pulse
ANS:- C
13 Electrons passing through matter lose energy primarily by producing:
A. Bremsstrahlung
B. Characteristic x-rays
C. Atomic ionizations
D. Compton electrons
ANS:- C
14. Tungsten is most likely used as an x-ray target because it has a high:
A. Physical density
B. Electron density
C. Electrical resistance
D. Melting point
ANS:- D
15 The maximum photon energy in x-ray beams is determined by the x-ray tube:
A. Current
B. Exposure time
C. Target material
D. Anode–cathode voltage
ANS:- D
16 The most likely characteristic x-ray energy (keV) from x-ray tubes used in chest radiography is:
A. 19
B. 33
C. 65
D. 75
ANS:- C
17 At 65 kV and with a tungsten target, the percentage (%) of K-shell x-rays in the x-ray beam is most likely:
A. 0
B. 1
C. 10
D. 50
ANS:- A
18 The average photon energy of an x-ray beam is least likely to be affected by changes in the:
A. Tube current
B. Tube voltage
C. Voltage waveform
D. Target composition
ANS:- A
19 The number of electrons accelerated across an x-ray tube is most strongly influenced by:
A. Anode speed
B. Focus size
C. Filament current
D. Tube filtration
ANS:- C
20 The most likely x-ray tube filament current (mA) is:
A. 0.4
B. 4
C. 400
D. 4,000
ANS:- D
21 Changing x-ray tube current (mA) most likely changes the x-ray:
A. Maximum energy
B. Average energy
C. Anode angle
D. Beam intensity
ANS:- D
22 The large focus dimension is most likely larger (%) than that of the small focus by:
A. 25
B. 50
C. 75
D. 100
ANS:- D
23 The anode angle (degrees) in an x-ray tube used for chest radiography is most likely:
A. 15
B. 30
C. 45
D. 60
ANS:- A
24 X-ray tube output would likely increase the most when increasing the x-ray tube:
A. Voltage
B. Anode angle
C. Target Z
D. Current
ANS:- A
25 A chest x-ray examination on a dedicated chest unit would be least likely to use:
A. 60-kV voltage
B. 800-mA tube current
C. 10-ms exposure time
D. 1-mm focus
ANS:- A
26 For specification of anode heat capacities, one heat unit corresponds to energy (J) of:
A. 0.9
B. 0.8
C. 0.7
D. 0.5
ANS:- C
27 At the same peak voltage, which generator likely deposits most energy into an anode?
A. Constant potential
B. High frequency
C. Three phase (12 pulse)
D. Three phase (6 pulse)
ANS:- A
28 Heat stored in x-ray tube anodes is most likely dissipated by:
A. Conduction
B. Radiation
C. Air cooling
D. Oil cooling
ANS:- B
29 In a standard x-ray tube, the maximum power loading (kW) on the 0.6mmfocal spot is most likely:
A. 2
B. 5
C. 10
D. 25
ANS:- D
30 Radiation transmitted through the x-ray tube housing is referred to as:
A. Useful
B. Secondary
C. Leakage
D. Scattered
ANS:- C
31. Compton effect shows that
A. X-rays are waves
B. X-rays have high energy
C. X-rays can penetrate matter
D. Photons have momentum
Ans:- D
32. X-rays when an incident on a metal
A. Exert a force on it
B. Transfer energy to it
C. Transfer pressure to it
D. All of the above
Ans:- D
33. What is the difference between soft and hard X-rays?
A. Velocity
B. Intensity
C. Frequency
D. Polarization
Ans:- C
34. When X- rays pass through a strong uniform magnetic field, then they
A. Do not get deflected at all
B. Get deflected in the direction of the field
C. Get deflected in the direction opposite to the field
D. Get deflected in the direction perpendicular to the field
Ans:- A
35. If the voltage of an X-ray tube is doubled, the intensity of X-rays will become
A. Half
B. Unchanged
C. Double
D. Four times
Ans:- B
36. X-rays cannot be deflected by means of an ordinary grating due to
A. Large wavelength
B. High speed
C. Short wavelength
D. None of these
Ans:- C
37. If the energy of K-shell electron is – 40000 eV and if 60000 V potential is applied at coolidge tube then which of the following X-rays will form
A. Continuous
B. White X-rays
C Continuous and all series of characteristics
D. None of these
Ans:- C
38. On increasing the number of electrons striking the anode of an X-ray tube, one of the following parameters of the resulting X-rays would increase
A. Penetration power
B. Frequency
C. Wavelength
D. Intensity
Ans:- D
39. X-rays are
A. Stream of electrons
B. Stream of positively charged particles
C. Electromagnetic radiations of high frequency
D. Stream of uncharged particles
Ans:- C
40. X-rays which can penetrate through longer distances in substance are called
A. Soft X-rays
B. Continuous X-rays
C. Hard X-rays
D. None of the above
Ans:- C
41. For harder X-rays
A. The wavelength is higher
B. The intensity is higher
C. The frequency is higher
D. The photon energy is lower
Ans:- C
42. X-rays region lies between
A. Short radiowave and visible region
B. Visible and ultraviolet region
C. Gamma rays and ultraviolet region
D. Short radiowave and long radiowave
Ans:- C
43. The voltage applied across an X-ray tube is nearly
A. 10 V
B. 100 V
C. 10000 V
D. 106 V
Ans:- C
44. X-rays are known to be electromagnetic radiation. Therefore, the X-ray photon has
A. Electric charge
B. Magnetic moment
C. Both electric charge and magnetic moment
D. Neither electric charge nor magnetic moment
Ans:- D
45. X-rays were discovered by
A. Becquerel
B. Roentgen
C. Marie Curie
D. Von Laue
Ans:- B
46. X-rays and gamma rays are both electromagnetic waves. Which of the following statements is true?
A. In general, X-rays have larger wavelength than gamma rays
B. X-rays have a smaller wavelength than that of gamma rays
C. Gamma rays have a smaller frequency than that of X-rays
D. Wavelength and frequency of X-rays are both larger than that of gamma rays
Ans:- A
47. The penetrating power of X-rays increases with the
A. Increase in its velocity
B. Increase in its frequency
C. Increase in its intensity
D. Decrease in its velocity
Ans:- B
48. A direct X-ray photograph of the intestines is not generally taken by the radiologists because
A. Intestines will burst on exposure to X-rays
B. The X-rays will not pass through the intestines
C. The X-rays will pass through the intestines without causing a good shadow for any useful diagnosis
D. A very small exposure of X-rays causes cancer in the intestines
Ans:- C
49. The X-ray beam coming from an X-ray tube will be
A. Monochromatic
B. Having all wavelengths smaller than a certain maximum wavelength
C. Having all wavelengths larger than a certain minimum wavelength
D. Having all wavelengths lying between a minimum and a maximum wavelength
Ans:- C
50. X-rays are in nature similar to
A. Beta rays
B. Gamma rays
C. de-Broglie waves
D. Cathode rays
Ans:- B
51. Which of the following wavelength falls in the X-ray region
A. 10000 Å
B. 1000 Å
C. 1 Å
D. 10–2 Å
Ans:- C
52. For continuous X-rays, the produced wavelength is
A. Inversely proportional to the energy of the electrons hitting the target
B. Inversely proportional to the intensity of the electron beam
C. Proportional to intensity of the electron beam
D. Proportional to target temperature
Ans:- A
53. Penetrating power of X-rays can be increased by
A. Increasing the potential difference between anode and cathode
B. Decreasing the potential difference between anode and cathode
C. Increasing the cathode filament current
D. Decreasing the cathode filament current
Ans:- A
54. The wavelength of X-rays is
A. 2000 Å
B. 2 Å
C. 1 mm
D. 1 cm
Ans:- B
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