PMU - Year 1 Physics - Part 3(A)

Question 1 of 49

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Electromagnetic Waves are composed of:

Select one of the following:

  • 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 of 49

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Which of the following electromagnetic wavelengths λ can be detected by the human eye:

Select one of the following:

  • 200 nm

  • 500 nm

  • 1000 nm

Question 3 of 49

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Radiation is monochromatic when:

Select one of the following:

  • It is composed of a single wavelength

  • Waves oscillate with a constant phase difference

  • Waves have equal intensity

Question 4 of 49

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Wavelength λ of visible light is in the range of:

Select one of the following:

  • 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 of 49

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Frequency of visible light is higher than the frequency of:

Select one of the following:

  • IR

  • UV

  • X-Rays

Question 6 of 49

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Metal vessels are not used in microwave ovens because:

Select one of the following:

  • 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 of 49

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The expression electromagnetic waves oscillate means:

Select one of the following:

  • 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 of 49

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Which is the most significant application of de Broglie wavelength in medicine:

Select one of the following:

  • The electron microscope

  • The endoscope

  • The optic microscope

  • The polarization microscope

Question 9 of 49

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Radiation protection standards for electromagnetic waves (EM) limit three of the following quantities. Which quantity is NOT limited:

Select one of the following:

  • Frequency of EM waves

  • Energy Load EH [W.h/m2]

  • Electric field intensity E [V/m]

  • Magnetic field intensity H [A/m]

Question 10 of 49

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Total internal reflection can occur if light passes from:

Select one of the following:

  • 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 of 49

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The most significant application of total internal reflection in medicine:

Select one of the following:

  • The Endoscope

  • The Dioptometer

  • The Laser

  • The Ophtalmoscope.

Question 12 of 49

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Which mode of light reflection is called diffusion:

Select one of the following:

  • From a mirror surface

  • From a surface with irregularities greater than lights wavelength

  • From a calm water surface

Question 13 of 49

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Which reflection mode of light if called specular:

Select one of the following:

  • 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 of 49

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The coefficient of reflection of light does not depend on:

Select one of the following:

  • The angle of incidence

  • The index of refraction - n

  • The wavelength λ of the light

  • The density ρ of the two media

Question 15 of 49

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Endoscopes are used in medicine for examination of:

Select one of the following:

  • The brain

  • The teeth

  • Hollow Organs

Question 16 of 49

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The imagine formed by a direct opthalmoscope (magnification up to 15x) is:

Select one of the following:

  • Virtual and erect

  • Virtual and Inverted

  • Real and Erect

  • Real and Inverted

Question 17 of 49

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The image formed by a indirect ophthalmoscope (magnificantion 2x / 5x) is:

Select one of the following:

  • Virtual and Erect

  • Virtual and Inverted

  • Real and Erect

  • Real and Inverted

Question 18 of 49

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Absorption spectrum of melanin (skin pigment, iris, hair, etc) is msotly in the:

Select one of the following:

  • Visible range

  • UV A Range

  • IR C Range

Question 19 of 49

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Analysis of colloidal solutions is carried out using:

Select one of the following:

  • Standard Spectrophotometer

  • Echograph

  • Radionuclide Generator

  • Turbidimeter/Nephelometer

Question 20 of 49

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When light is polarized, the electric field vector E oscillates in the direction:

Select one of the following:

  • Of light propagation

  • Perpendicular to light propagation

  • Of magnetic field vector H

Question 21 of 49

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When light is completely polarized, the electric field vector E oscillates

Select one of the following:

  • 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 of 49

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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)

Select one of the following:

  • Cl;

  • C/l;

  • l/C;

Question 23 of 49

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The specific rotation angle for camphor [+42 0] means that this pharmaceutical rotates the plane of polarization:

Select one of the following:

  • Clockwise(left-handed)

  • Counter-clockwise (right-handed)

  • In the two directions depending on the angle of incidence of light

Question 24 of 49

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The rotation angle of polarized light α (a property of optically active pharmaceuticals) is determined by the method of:

Select one of the following:

  • Echography

  • Photocolorimetry

  • Spectropolarimetry

Question 25 of 49

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How do polarized microscopes improve on conventional optical microscopes

Select one of the following:

  • Higher resolution

  • Visualization of optically active structures, indiscernible for conventional microscopes

  • Direct observation of examined objects

Question 26 of 49

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Which optical phenomenon, other than polarization, is used in polarimetry:

Select one of the following:

  • Total internal reflection

  • Light scattering

  • Light dispersion

Question 27 of 49

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The concentration of which substance can be determined using polarimetry

Select one of the following:

  • Urea

  • Uric Acid

  • Glucose in the blood plasma and urine

Question 28 of 49

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Longitudinal waves cannot be:

Select one of the following:

  • Reflected

  • Diffracted

  • Dispersed

  • Polarized

Question 29 of 49

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The atmospheric ozone layer absorbs mostly:

Select one of the following:

  • UV rays

  • Visible light

  • IR rays

Question 30 of 49

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Energy of UV light is lower than the energy of

Select one of the following:

  • Visible light

  • IR light

  • x-rays

Question 31 of 49

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UV radiation is:

Select one of the following:

  • Electromagnetic waves

  • Flux of protons

  • Flux of electrons

Question 32 of 49

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UV radiation has wavelengths shorter than:

Select one of the following:

  • Visible light

  • x-rays

  • Gamma-rays

Question 33 of 49

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UV radiation has wavelengths longer than

Select one of the following:

  • Visible light

  • IR light

  • X-rays

Question 34 of 49

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Sun protection factor (SPF) specifies UV protection mainly in the region of:

Select one of the following:

  • UV A

  • UV B

  • UV C

Question 35 of 49

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Why is UV light in the 10 nm to 200 nm range NOT included in UVA, UVB or UVC ranges:

Select one of the following:

  • 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 of 49

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The percentage of UV light reaching Earths surface from the total solar spectrum is:

Select one of the following:

  • 10%

  • 50%

  • 1%

Question 37 of 49

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IR rays are:

Select one of the following:

  • Electromagnetic radiation

  • Flux of protons

  • Flux of electrons

Question 38 of 49

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The main effect of IR rays is:

Select one of the following:

  • Bactericidal

  • Thermal

  • Photo-stimulating

Question 39 of 49

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The energy of IR is higher than that of:

Select one of the following:

  • Radio-waves

  • Visible Light

  • UV rays

Question 40 of 49

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The IR electromagnetic spectrum has wavelength range of:

Select one of the following:

  • 10 - 400nm

  • 380 - 760 nm

  • 0.76 - 1000 µm

Question 41 of 49

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Band A of IR radiation is :

Select one of the following:

  • 0.76 µm - 2.5 µm

  • 0.25 µm - 50 µm

  • 50 µm - 1000 µm

Question 42 of 49

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Band B of IR radiation is :

Select one of the following:

  • 0.76 µm - 2.5 µm

  • 2.5 µm - 50 µm

  • 50 µm - 1000 µm

Question 43 of 49

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Band C of IR radiation is :

Select one of the following:

  • 0.76 µm - 2.5 µm

  • 2.5 µm - 50 µm

  • 50 µm - 1000 µm

Question 44 of 49

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Which type of life is NOT fully absorbed in water:

Select one of the following:

  • UV

  • Visible Light

  • IR

Question 45 of 49

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Thermography is diagnostic imaging method which is:

Select one of the following:

  • Absolutely harmless

  • With a high resolution

  • With diagnostic value greater than that of MRI

Question 46 of 49

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Thermography uses:

Select one of the following:

  • IR rays

  • UV rays

  • Radiopharmaceuticals

Question 47 of 49

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Emission spectrum of the human body is in the:

Select one of the following:

  • Red end of visible spectrum

  • UV range

  • IR range

Question 48 of 49

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IR rays do NOT have application in:

Select one of the following:

  • Toxicology, for finding traces of toxins in tissues

  • Forensic medicine, for night photography

  • In Thermography

Question 49 of 49

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What is the approximate IR power emitted from the human body in room temperature:

Select one of the following:

  • 50mW

  • 50W

  • 5 W

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PMU - Year 1 Physics - Part 3(A)

Sole C
Quiz by , created almost 2 years ago

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

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Sole C
Created by Sole C almost 2 years ago
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