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Quiz by Sole C, created more than 1 year 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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	Created by Sole C about 9 years ago

PMU - Year 1 Physics - Part 3(A)

Question 1 of 49

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

Explanation

Question 2 of 49

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

Explanation

Question 3 of 49

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

Explanation

Question 4 of 49

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

Explanation

Question 5 of 49

Frequency of visible light is higher than the frequency of:

Select one of the following:

IR
UV
X-Rays

Explanation

Question 6 of 49

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.

Explanation

Question 7 of 49

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

Explanation

Question 8 of 49

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

Explanation

Question 9 of 49

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]

Explanation

Question 10 of 49

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

Explanation

Question 11 of 49

The most significant application of total internal reflection in medicine:

Select one of the following:

The Endoscope
The Dioptometer
The Laser
The Ophtalmoscope.

Explanation

Question 12 of 49

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

Explanation

Question 13 of 49

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.

Explanation

Question 14 of 49

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

Explanation

Question 15 of 49

Endoscopes are used in medicine for examination of:

Select one of the following:

The brain
The teeth
Hollow Organs

Explanation

Question 16 of 49

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

Explanation

Question 17 of 49

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

Explanation

Question 18 of 49

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

Explanation

Question 19 of 49

Analysis of colloidal solutions is carried out using:

Select one of the following:

Standard Spectrophotometer
Echograph
Radionuclide Generator
Turbidimeter/Nephelometer

Explanation

Question 20 of 49

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

Explanation

Question 21 of 49

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

Explanation

Question 22 of 49

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;

Explanation

Question 23 of 49

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

Explanation

Question 24 of 49

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

Explanation

Question 25 of 49

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

Explanation

Question 26 of 49

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

Select one of the following:

Total internal reflection
Light scattering
Light dispersion

Explanation

Question 27 of 49

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

Explanation

Question 28 of 49

Longitudinal waves cannot be:

Select one of the following:

Reflected
Diffracted
Dispersed
Polarized

Explanation

Question 29 of 49

The atmospheric ozone layer absorbs mostly:

Select one of the following:

UV rays
Visible light
IR rays

Explanation

Question 30 of 49

Energy of UV light is lower than the energy of

Select one of the following:

Visible light
IR light
x-rays

Explanation

Question 31 of 49

UV radiation is:

Select one of the following:

Electromagnetic waves
Flux of protons
Flux of electrons

Explanation

Question 32 of 49

UV radiation has wavelengths shorter than:

Select one of the following:

Visible light
x-rays
Gamma-rays

Explanation

Question 33 of 49

UV radiation has wavelengths longer than

Select one of the following:

Visible light
IR light
X-rays

Explanation

Question 34 of 49

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

Select one of the following:

UV A
UV B
UV C

Explanation

Question 35 of 49

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.

Explanation

Question 36 of 49

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

Select one of the following:

Explanation

Question 37 of 49

IR rays are:

Select one of the following:

Electromagnetic radiation
Flux of protons
Flux of electrons

Explanation

Question 38 of 49

The main effect of IR rays is:

Select one of the following:

Bactericidal
Thermal
Photo-stimulating

Explanation

Question 39 of 49

The energy of IR is higher than that of:

Select one of the following:

Radio-waves
Visible Light
UV rays

Explanation

Question 40 of 49

The IR electromagnetic spectrum has wavelength range of:

Select one of the following:

10 - 400nm
380 - 760 nm
0.76 - 1000 µm

Explanation

Question 41 of 49

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

Explanation

Question 42 of 49

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

Explanation

Question 43 of 49

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

Explanation

Question 44 of 49

Which type of life is NOT fully absorbed in water:

Select one of the following:

UV
Visible Light
IR

Explanation

Question 45 of 49

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

Explanation

Question 46 of 49

Thermography uses:

Select one of the following:

IR rays
UV rays
Radiopharmaceuticals

Explanation

Question 47 of 49

Emission spectrum of the human body is in the:

Select one of the following:

Red end of visible spectrum
UV range
IR range

Explanation

Question 48 of 49

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

Explanation

Question 49 of 49

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

Select one of the following:

50mW
50W
5 W