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PMU - Year 1 Physics - Part 3(A)

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All Questions uploaded word for word from MCQ book. All Credit to Authors. Mistakes due in process may have been made, use and check your work at your own discretion. Only simple writing allowed, i.e Superscript and Subscript absent. Questions missed due to Figure/Diagrams/Text: 8.12.20.21.22.24.25.26.27.28.29.40.41.42
Sole C
Quiz by Sole C, updated more than 1 year ago
Sole C
Created by Sole C almost 10 years ago
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Question 1

Question
Electromagnetic Waves are composed of:
Answer
  • Electric and magnetic fields, oscillating in-phase
  • Electric and magnetic fields, oscillating out of phase
  • Electric and magnetic fields, oscillating sometimes in and sometimes out of phase

Question 2

Question
Which of the following electromagnetic wavelengths λ can be detected by the human eye:
Answer
  • 200 nm
  • 500 nm
  • 1000 nm

Question 3

Question
Radiation is monochromatic when:
Answer
  • It is composed of a single wavelength
  • Waves oscillate with a constant phase difference
  • Waves have equal intensity

Question 4

Question
Wavelength λ of visible light is in the range of:
Answer
  • Up to 10 nm
  • from 10 nm to 380 nm
  • from 380 nm to 760 nm
  • from 0.76 µm to 1000 µm

Question 5

Question
Frequency of visible light is higher than the frequency of:
Answer
  • IR
  • UV
  • X-Rays

Question 6

Question
Metal vessels are not used in microwave ovens because:
Answer
  • Electric permittivity ε and magnetic permeability μ of metals is high and microwaves would generate high currents in the metal, causing heating and damage.
  • Metals vessel block microwave radiation from reaching the food
  • Substances are emitted from the metal, that affect the food.

Question 7

Question
The expression electromagnetic waves oscillate means:
Answer
  • Electromagnetic waves continuously change direction of propagation
  • Electric E and magnetic H field vectors change in time
  • Electromagnetic waves cause vibrations in the propagation medium

Question 8

Question
Which is the most significant application of de Broglie wavelength in medicine:
Answer
  • The electron microscope
  • The endoscope
  • The optic microscope
  • The polarization microscope

Question 9

Question
Radiation protection standards for electromagnetic waves (EM) limit three of the following quantities. Which quantity is NOT limited:
Answer
  • Frequency of EM waves
  • Energy Load EH [W.h/m2]
  • Electric field intensity E [V/m]
  • Magnetic field intensity H [A/m]

Question 10

Question
Total internal reflection can occur if light passes from:
Answer
  • A material of low optical density to a material of high optical density
  • A material of high optical density to a material of low optical density
  • Air to Water

Question 11

Question
The most significant application of total internal reflection in medicine:
Answer
  • The Endoscope
  • The Dioptometer
  • The Laser
  • The Ophtalmoscope.

Question 12

Question
Which mode of light reflection is called diffusion:
Answer
  • From a mirror surface
  • From a surface with irregularities greater than lights wavelength
  • From a calm water surface

Question 13

Question
Which reflection mode of light if called specular:
Answer
  • From the surface of a pure mountain lake
  • From a metal surface
  • From a surface with irregularities considerably smaller than light's wavelength.

Question 14

Question
The coefficient of reflection of light does not depend on:
Answer
  • The angle of incidence
  • The index of refraction - n
  • The wavelength λ of the light
  • The density ρ of the two media

Question 15

Question
Endoscopes are used in medicine for examination of:
Answer
  • The brain
  • The teeth
  • Hollow Organs

Question 16

Question
The imagine formed by a direct opthalmoscope (magnification up to 15x) is:
Answer
  • Virtual and erect
  • Virtual and Inverted
  • Real and Erect
  • Real and Inverted

Question 17

Question
The image formed by a indirect ophthalmoscope (magnificantion 2x / 5x) is:
Answer
  • Virtual and Erect
  • Virtual and Inverted
  • Real and Erect
  • Real and Inverted

Question 18

Question
Absorption spectrum of melanin (skin pigment, iris, hair, etc) is msotly in the:
Answer
  • Visible range
  • UV A Range
  • IR C Range

Question 19

Question
Analysis of colloidal solutions is carried out using:
Answer
  • Standard Spectrophotometer
  • Echograph
  • Radionuclide Generator
  • Turbidimeter/Nephelometer

Question 20

Question
When light is polarized, the electric field vector E oscillates in the direction:
Answer
  • Of light propagation
  • Perpendicular to light propagation
  • Of magnetic field vector H

Question 21

Question
When light is completely polarized, the electric field vector E oscillates
Answer
  • In all directions in a plane perpendicular to the velocity of light
  • In one direction coinciding with the velocity of light
  • In one direction in a plane perpendicular to the velocity of light

Question 22

Question
The angle of rotation of the plane of polarized light coefficient is proportional to: (C - Concentration of solution in %; l - thickness of the substance layer in dm)
Answer
  • Cl;
  • C/l;
  • l/C;

Question 23

Question
The specific rotation angle for camphor [+42 0] means that this pharmaceutical rotates the plane of polarization:
Answer
  • Clockwise(left-handed)
  • Counter-clockwise (right-handed)
  • In the two directions depending on the angle of incidence of light

Question 24

Question
The rotation angle of polarized light α (a property of optically active pharmaceuticals) is determined by the method of:
Answer
  • Echography
  • Photocolorimetry
  • Spectropolarimetry

Question 25

Question
How do polarized microscopes improve on conventional optical microscopes
Answer
  • Higher resolution
  • Visualization of optically active structures, indiscernible for conventional microscopes
  • Direct observation of examined objects

Question 26

Question
Which optical phenomenon, other than polarization, is used in polarimetry:
Answer
  • Total internal reflection
  • Light scattering
  • Light dispersion

Question 27

Question
The concentration of which substance can be determined using polarimetry
Answer
  • Urea
  • Uric Acid
  • Glucose in the blood plasma and urine

Question 28

Question
Longitudinal waves cannot be:
Answer
  • Reflected
  • Diffracted
  • Dispersed
  • Polarized

Question 29

Question
The atmospheric ozone layer absorbs mostly:
Answer
  • UV rays
  • Visible light
  • IR rays

Question 30

Question
Energy of UV light is lower than the energy of
Answer
  • Visible light
  • IR light
  • x-rays

Question 31

Question
UV radiation is:
Answer
  • Electromagnetic waves
  • Flux of protons
  • Flux of electrons

Question 32

Question
UV radiation has wavelengths shorter than:
Answer
  • Visible light
  • x-rays
  • Gamma-rays

Question 33

Question
UV radiation has wavelengths longer than
Answer
  • Visible light
  • IR light
  • X-rays

Question 34

Question
Sun protection factor (SPF) specifies UV protection mainly in the region of:
Answer
  • UV A
  • UV B
  • UV C

Question 35

Question
Why is UV light in the 10 nm to 200 nm range NOT included in UVA, UVB or UVC ranges:
Answer
  • UV radiation from the Sun in this interval is absorbed by the atmosphere
  • UV radiation in this interval cannot be produced artificially
  • Photo-biological effects of such radiation are unknown.

Question 36

Question
The percentage of UV light reaching Earths surface from the total solar spectrum is:
Answer
  • 10%
  • 50%
  • 1%

Question 37

Question
IR rays are:
Answer
  • Electromagnetic radiation
  • Flux of protons
  • Flux of electrons

Question 38

Question
The main effect of IR rays is:
Answer
  • Bactericidal
  • Thermal
  • Photo-stimulating

Question 39

Question
The energy of IR is higher than that of:
Answer
  • Radio-waves
  • Visible Light
  • UV rays

Question 40

Question
The IR electromagnetic spectrum has wavelength range of:
Answer
  • 10 - 400nm
  • 380 - 760 nm
  • 0.76 - 1000 µm

Question 41

Question
Band A of IR radiation is :
Answer
  • 0.76 µm - 2.5 µm
  • 0.25 µm - 50 µm
  • 50 µm - 1000 µm

Question 42

Question
Band B of IR radiation is :
Answer
  • 0.76 µm - 2.5 µm
  • 2.5 µm - 50 µm
  • 50 µm - 1000 µm

Question 43

Question
Band C of IR radiation is :
Answer
  • 0.76 µm - 2.5 µm
  • 2.5 µm - 50 µm
  • 50 µm - 1000 µm

Question 44

Question
Which type of life is NOT fully absorbed in water:
Answer
  • UV
  • Visible Light
  • IR

Question 45

Question
Thermography is diagnostic imaging method which is:
Answer
  • Absolutely harmless
  • With a high resolution
  • With diagnostic value greater than that of MRI

Question 46

Question
Thermography uses:
Answer
  • IR rays
  • UV rays
  • Radiopharmaceuticals

Question 47

Question
Emission spectrum of the human body is in the:
Answer
  • Red end of visible spectrum
  • UV range
  • IR range

Question 48

Question
IR rays do NOT have application in:
Answer
  • Toxicology, for finding traces of toxins in tissues
  • Forensic medicine, for night photography
  • In Thermography

Question 49

Question
What is the approximate IR power emitted from the human body in room temperature:
Answer
  • 50mW
  • 50W
  • 5 W
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