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Transformation of non-electrical quantities. Calibration of semiconductor, thermometer and photoelement - Medical Physics - MCQs

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Medical Physics Quiz on Transformation of non-electrical quantities. Calibration of semiconductor, thermometer and photoelement - Medical Physics - MCQs, created by Hussain Basheer on 23/11/2018.
Hussain Basheer
Quiz by Hussain Basheer, updated more than 1 year ago
Hussain Basheer
Created by Hussain Basheer about 6 years ago
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Resource summary

Question 1

Question
If a semiconductor is brought down to temperature of absolute zero (0 Kelvin), it will become:
Answer
  • A conductor
  • A superconductor
  • An insulator

Question 2

Question
According to Band Theory of Solids, what can be said about the relationship between band-gap width and the tendency of material to conduct electricity?
Answer
  • The greater the band-gap width the less conductive is the material
  • The lesser the band-gap width the more insulating is the material
  • The greater the band-gap width the more conductive is the material

Question 3

Question
According to Band Theory of Solids, what can be said about P- and N- type conductivity with regard to the location of the electron bands?
Answer
  • P and N type conductivities are in the conduction band
  • P-type conductivity is in the conduction band, and N-conductivity is in the valence band
  • P-type conductivity is in the valence band, and N-conductivity is in the conduction band

Question 4

Question
What are the respective current carriers for N- and P-type conductivity?
Answer
  • Electrons
  • P-type carriers are “holes”, and N-type are electrons
  • P-type are positrons, and N-type are “holes”

Question 5

Question
Typical semiconductors such as Silicon and Germanium are group IV elements. Choose the correct statement regarding the doping and the type of conductivity (N or P) acquired, after doping:
Answer
  • P-type conductivity is achieved by doping with elements from group V, and N-type conductivity is achieved by doping with elements from group III
  • Both types are achieved from doping with group IV
  • P-type conductivity is achieved by doping with elements from group III, and N-type conductivity is achieved by doping with elements from group V

Question 6

Question
What is the relationship between N- and P- type charge carriers for intrinsic (undoped) semiconductors?
Answer
  • N = P
  • N > P
  • N < P

Question 7

Question
For semiconducting materials, charge carrier species called holes are best described as:
Answer
  • Electrons moving in opposite direction
  • Protons
  • Virtual particles signifying electron vacancy

Question 8

Question
In doped (extrinsic) semiconductors, the predominant current carriers are called majority charge carriers, and secondary carriers are called minority. Which statement is true for N-and P-type semiconductors:
Answer
  • In N-type semiconductors, electrons are majority carriers and holes are minority carriers
  • In P-type semiconductors, majority carriers are electrons, and minority charge carriers are holes
  • In N-type semiconductors, both types of carriers are equally present

Question 9

Question
Transistors are made of N- and P-type semiconductors arranged in a such way that:
Answer
  • There are two p-n junctions
  • There are three p-n junctions
  • There is one p-n junction

Question 10

Question
The two main functions of the transistor are:
Answer
  • Polarizer and oscillator
  • Amplifier and switch
  • Rectifier and attenuator

Question 11

Question
Choose the FALSE statement. Electrical amplifiers are used for:
Answer
  • Voltage
  • Frequency
  • Current

Question 12

Question
The magnitude of electrical impedance of biological tissues is the (Pythagorean) sum of:
Answer
  • Resistance and capacitive reactance
  • Inductive and capacitive reactance
  • Resistance and inductive reactance

Question 13

Question
What type of transducer is the piezoelectric crystal in ultrasonic equipment, when working in receiving mode?
Answer
  • Generative transducer
  • Both, generative and parametric
  • Parametric transducer

Question 14

Question
The “band gap” in semiconductor theory is defined as:
Answer
  • The distance between valence and conduction bands
  • The frequency gap between AM and FM radio bands
  • The energy gap between valence and conduction bands

Question 15

Question
When temperature increases, the band gap in a semiconductor:
Answer
  • Increases, due to increased kinetic energy of atoms
  • Remains the same, because electrons are bound in their orbits
  • Decreases, due to electron-phonon interactions

Question 16

Question
When semiconductor is doped with element of lower valence (P-type doping) it becomes a donor (gives off electrons) and there is a shift in the energy band gap. The new electron levels are:
Answer
  • Near the middle of the band gap
  • Near the conduction band
  • Near the valence band

Question 17

Question
When temperature increases, the conductivity of semiconductors:
Answer
  • Increases
  • Decreases
  • Remains the same

Question 18

Question
When semiconductor is doped with element of higher valence (N-type doping) it becomes an acceptor (takes electrons) and there is a shift in the energy band gap. The new electron levels are:
Answer
  • Near the middle of the band gap
  • Near the conduction band
  • Near the valence band

Question 19

Question
When Silicon (Si) is doped with one of the following elements, it acquires P-type conductivity (holes are the majority carriers). Choose the one:
Answer
  • Boron (B), valence III
  • Phosphorus (P), valence V
  • Tin (Sn), valence IV

Question 20

Question
Electric circuit components composed of single p-n junction are called:
Answer
  • Capacitors
  • Transistors
  • Diodes

Question 21

Question
What is the mathematical relation between the electrical resistance (R) in a semiconductor and the temperature (T)?
Answer
  • Linear (as T increases, R decreases with constant rate)
  • Proportional (as T increases, R increases with constant rate)
  • Exponential decay (as T increases, R decreases with increasing rate)

Question 22

Question
What is the mathematical relationship between the generated voltage in a photodiode and the distance from the light source?
Answer
  • Quadratic (voltage increase as the square of the distance)
  • Inversely proportional (decreases as one over the distance)
  • Exponential (increases with increasing rate)

Question 23

Question
Which of the following statements is true about the element Germanium?
Answer
  • The resistivity at room temperature is lower than that of Copper
  • When heated the resistivity decreases
  • The resistivity is constant over a wide range

Question 24

Question
The most common material in modern integrated circuits is:
Answer
  • Silicon
  • Carbon
  • Titanium
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