Test
PMU - Year 1 Physics - Part 3(A)
Preguntas del test (49)
1Electromagnetic Waves are composed of:
- AElectric and magnetic fields, oscillating in-phase
- BElectric and magnetic fields, oscillating out of phase
- CElectric and magnetic fields, oscillating sometimes in and sometimes out of phase
2Which of the following electromagnetic wavelengths λ can be detected by the human eye:
- A200 nm
- B500 nm
- C1000 nm
3Radiation is monochromatic when:
- AIt is composed of a single wavelength
- BWaves oscillate with a constant phase difference
- CWaves have equal intensity
4Wavelength λ of visible light is in the range of:
- AUp to 10 nm
- Bfrom 10 nm to 380 nm
- Cfrom 380 nm to 760 nm
- Dfrom 0.76 µm to 1000 µm
5Frequency of visible light is higher than the frequency of:
- AIR
- BUV
- CX-Rays
6Metal vessels are not used in microwave ovens because:
- AElectric permittivity ε and magnetic permeability μ of metals is high and microwaves would generate high currents in the metal, causing heating and damage.
- BMetals vessel block microwave radiation from reaching the food
- CSubstances are emitted from the metal, that affect the food.
7The expression electromagnetic waves oscillate means:
- AElectromagnetic waves continuously change direction of propagation
- BElectric E and magnetic H field vectors change in time
- CElectromagnetic waves cause vibrations in the propagation medium
8Which is the most significant application of de Broglie wavelength in medicine:
- AThe electron microscope
- BThe endoscope
- CThe optic microscope
- DThe polarization microscope
9Radiation protection standards for electromagnetic waves (EM) limit three of the following quantities. Which quantity is NOT limited:
- AFrequency of EM waves
- BEnergy Load EH [W.h/m2]
- CElectric field intensity E [V/m]
- DMagnetic field intensity H [A/m]
10Total internal reflection can occur if light passes from:
- AA material of low optical density to a material of high optical density
- BA material of high optical density to a material of low optical density
- CAir to Water
11The most significant application of total internal reflection in medicine:
- AThe Endoscope
- BThe Dioptometer
- CThe Laser
- DThe Ophtalmoscope.
12Which mode of light reflection is called diffusion:
- AFrom a mirror surface
- BFrom a surface with irregularities greater than lights wavelength
- CFrom a calm water surface
13Which reflection mode of light if called specular:
- AFrom the surface of a pure mountain lake
- BFrom a metal surface
- CFrom a surface with irregularities considerably smaller than light's wavelength.
14The coefficient of reflection of light does not depend on:
- AThe angle of incidence
- BThe index of refraction - n
- CThe wavelength λ of the light
- DThe density ρ of the two media
15Endoscopes are used in medicine for examination of:
- AThe brain
- BThe teeth
- CHollow Organs
16The imagine formed by a direct opthalmoscope (magnification up to 15x) is:
- AVirtual and erect
- BVirtual and Inverted
- CReal and Erect
- DReal and Inverted
17The image formed by a indirect ophthalmoscope (magnificantion 2x / 5x) is:
- AVirtual and Erect
- BVirtual and Inverted
- CReal and Erect
- DReal and Inverted
18Absorption spectrum of melanin (skin pigment, iris, hair, etc) is msotly in the:
- AVisible range
- BUV A Range
- CIR C Range
19Analysis of colloidal solutions is carried out using:
- AStandard Spectrophotometer
- BEchograph
- CRadionuclide Generator
- DTurbidimeter/Nephelometer
20When light is polarized, the electric field vector E oscillates in the direction:
- AOf light propagation
- BPerpendicular to light propagation
- COf magnetic field vector H
21When light is completely polarized, the electric field vector E oscillates
- AIn all directions in a plane perpendicular to the velocity of light
- BIn one direction coinciding with the velocity of light
- CIn one direction in a plane perpendicular to the velocity of light
22The 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)
- ACl;
- BC/l;
- Cl/C;
23The specific rotation angle for camphor [+42 0] means that this pharmaceutical rotates the plane of polarization:
- AClockwise(left-handed)
- BCounter-clockwise (right-handed)
- CIn the two directions depending on the angle of incidence of light
24The rotation angle of polarized light α (a property of optically active pharmaceuticals) is determined by the method of:
- AEchography
- BPhotocolorimetry
- CSpectropolarimetry
25How do polarized microscopes improve on conventional optical microscopes
- AHigher resolution
- BVisualization of optically active structures, indiscernible for conventional microscopes
- CDirect observation of examined objects
26Which optical phenomenon, other than polarization, is used in polarimetry:
- ATotal internal reflection
- BLight scattering
- CLight dispersion
27The concentration of which substance can be determined using polarimetry
- AUrea
- BUric Acid
- CGlucose in the blood plasma and urine
28Longitudinal waves cannot be:
- AReflected
- BDiffracted
- CDispersed
- DPolarized
29The atmospheric ozone layer absorbs mostly:
- AUV rays
- BVisible light
- CIR rays
30Energy of UV light is lower than the energy of
- AVisible light
- BIR light
- Cx-rays
31UV radiation is:
- AElectromagnetic waves
- BFlux of protons
- CFlux of electrons
32UV radiation has wavelengths shorter than:
- AVisible light
- Bx-rays
- CGamma-rays
33UV radiation has wavelengths longer than
- AVisible light
- BIR light
- CX-rays
34Sun protection factor (SPF) specifies UV protection mainly in the region of:
- AUV A
- BUV B
- CUV C
35Why is UV light in the 10 nm to 200 nm range NOT included in UVA, UVB or UVC ranges:
- AUV radiation from the Sun in this interval is absorbed by the atmosphere
- BUV radiation in this interval cannot be produced artificially
- CPhoto-biological effects of such radiation are unknown.
36The percentage of UV light reaching Earths surface from the total solar spectrum is:
- A10%
- B50%
- C1%
37IR rays are:
- AElectromagnetic radiation
- BFlux of protons
- CFlux of electrons
38The main effect of IR rays is:
- ABactericidal
- BThermal
- CPhoto-stimulating
39The energy of IR is higher than that of:
- ARadio-waves
- BVisible Light
- CUV rays
40The IR electromagnetic spectrum has wavelength range of:
- A10 - 400nm
- B380 - 760 nm
- C0.76 - 1000 µm
41Band A of IR radiation is :
- A0.76 µm - 2.5 µm
- B0.25 µm - 50 µm
- C50 µm - 1000 µm
42Band B of IR radiation is :
- A0.76 µm - 2.5 µm
- B2.5 µm - 50 µm
- C50 µm - 1000 µm
43Band C of IR radiation is :
- A0.76 µm - 2.5 µm
- B2.5 µm - 50 µm
- C50 µm - 1000 µm
44Which type of life is NOT fully absorbed in water:
- AUV
- BVisible Light
- CIR
45Thermography is diagnostic imaging method which is:
- AAbsolutely harmless
- BWith a high resolution
- CWith diagnostic value greater than that of MRI
46Thermography uses:
- AIR rays
- BUV rays
- CRadiopharmaceuticals
47Emission spectrum of the human body is in the:
- ARed end of visible spectrum
- BUV range
- CIR range
48IR rays do NOT have application in:
- AToxicology, for finding traces of toxins in tissues
- BForensic medicine, for night photography
- CIn Thermography
49What is the approximate IR power emitted from the human body in room temperature:
- A50mW
- B50W
- C5 W
Información
- Descripción
- 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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- Idioma
- English
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