Copy and Edit

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

Description

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
317
7
0

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
Show full summary Hide full summary

Want to create your own Quizzes for free with GoConqr? Learn more.

Similar

Jekyll and Hyde
elliesussex
Computing
Ben Leader
Korean Grammar Syllabus
Dxoxo
Organic Chemistry Functional Groups
linpubotwheeds
USA and Vietnam (1964-1975) - Part 1
Lewis Appleton-Jones
USA and Vietnam (1964 - 1975) Part 2
Lewis Appleton-Jones
Unit 1 Cells, exchange and transport (F211) - cells
Jenni
History- Religion and medicine
gemma.bell
Pathos in Battle
mouldybiscuit
Cells And Cell Techniques - Flashcards (AQA AS-Level Biology)
Henry Kitchen
Maths: Geometry
noajaho1
Browse Library