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past MCQs Flashcards

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1
Q

tables presents main regions of electromagnetic spectrum numbered parts
radiowave, 1, 2, 3, x - rays, 4

A 
1 = infrared
2 = visible
3 = ultraviolet
4 = gamma rays
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2
Q

the region of the visible spectrum which has the greatest penetration of human tissue is

A

red

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3
Q

the impulse principle used to reduce RTA accident through

A

seatbelt
crumple zone
collapsible steering wheel
air bags

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4
Q

3 important components of laser system

A

active medium
excitation mechanism
cavity

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5
Q

True of false

the active medium determines the type of the wavelength that can be emitted from the laser devise

A

true

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6
Q

the active medium can be

A

solid
liquid
gas
plasma

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7
Q

laser radiation characterization are

A

coherent
monochromatic
collimated

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8
Q

the type of wavelength can be used in vision correction is

A

ultraviolet

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9
Q

the depth to which laser light penetrates into tissue depends on

A

wavelength of laser light

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10
Q

laser energy may interact with biological tissue in a number of ways. which of the following is the most important type of interaction in terms of laser ability to alter target tissue

A

absorption

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11
Q

which of the following wavelength exhibits the least amount of absorbance into tissue?

a) 250nm
b) 532nm
c) 700nm
d) 1064nm
e) 10600nm

A

e) 10600nm

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12
Q

the following categories of electromagnetic radiation are arranged in the order of increasing frequency

A

infra red, visible, microwaves, ultraviolet, x rays

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13
Q 
which of the following is not a vector?
displacement
mass
velocity
momentum
acceleration
A

mass

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14
Q 
which of the following is a scalar?
acceleration
energy
force
momentum
velocity
A

energy

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15
Q 
which of the following is not a vector?
displacement
time
velocity
force
acceleration
A

time

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16
Q

the frequency of a wave is

A

the number of waves passing a fixed point in one second

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17
Q

low frequencies penetrate

A

furthest into biological tissue

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18
Q

wavelength is defined as

A

the distance between each repeating element of the wave

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19
Q

the ___ of a wave is the number of ___ that pass a fixed point in one second

A

frequency

cycles

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20
Q

the energy of a wave is
directly proportional to
inversely proportional to

A

directly proportional to its frequency

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21
Q

the mechanical property of impulse has important implications for the severity of injuries caused in road traffic accidents. impulse is defined as

A

change in momentum

22
Q

impact forces in road traffic accidents can be reduced by

A

increasing interaction time over which the impulse occurs

23
Q 
the mechanical advantage of class II lever system can be 
equal to 1 
less than 1
both of the above
none of the above
A

none of the above

24
Q

laser radiation has the following properties

a) it is produced by stimulated emission of radiation
b) collimated
c) monochromatic
d) coherent
e) all of the above

A

all of the above

25
Q

clinically useful lasers produce

a) mid-infrared radiation
b) near infrared radiation
c) UV radiation
d) visible radiation
e) all of the above

A

e) all of the above

26
Q

in road traffic accident. which of the following is true.

a) injuries can be avoided if the impulse is increased
b) injuries can be avoided if the interaction time is reduced
c) internal injuries often result from the inertia of the internal organs
d) active head restraints utilise the impulse principle
e) collapsible steering columns are designed primarily to prevent head injuries

A

c) internal injuries often result from inertia of internal organs

27
Q

impulse principle is described by

a) newton’s first law of motion
b) newtons second law of motion
c) both of the above
d) none of the above

A

c) both of the above

28
Q

impact force on the occupant of a vehicle during a traffic accident is reduced by

A

increase time of impulse

29
Q

impulse is defined as

A

force x interaction time

change in momentum

30
Q

product of mass and acceleration is

A

force

31
Q

low frequencies penetrate

A

furthest into biological tissue

32
Q 
which one of these has the lowest energy
UV
gamma rays
red light
microwaves
x - rays
A

microwaves

33
Q

list precautions that must be taken for microshock sensitive patients

A

electrical equipment should be earthed

patient should NOT be grounded

34
Q

list conditions that consider someone to be microshock sensitive

A

have artificial pacemaker
catheters
internally placed conductor

35
Q

stress unit

A

N/m^2

36
Q

strain unit

A

ε

37
Q

define compression

A

intermolecular forces push together, causing the material to deform and thus reducing the volume of the material

38
Q

define tension

A

causes stretching and elongation of material along axis of load applied

39
Q

shear stress definition

A

stress acts parallel to surface

deformed by slippage of material

40
Q

The _______ of a force is a measure of the ability of the force to produce a turning effect about an axis.

A

moment

41
Q

Airbags, collapsible steering columns and padded interiors all use the ___________ Principle to reduce injuries in road traffic collisions

A

impulse

42
Q

Acceleration is the rate of change of ______________.

A

velocity

43
Q

If 5 mA is the maximum harmless current and the resistance of dry skin is 100,000 ohms, what is the maximum voltage that will be safe to the body?

A

500V

44
Q

torque

A

distance x force

45
Q

skin impedance is ___ proportional to frequency

A

inversely

46
Q

give value of mechanical advantage of class I lever

A

less than greater than or equal to 1

47
Q

give value of mechanical advantage of class II lever

A

greater than 1

48
Q

give value of mechanical advantage of class III lever

A

lesser than 1

49
Q

elastic deformation

A

when there is a change in length, but the material can return to its original length.

50
Q

plastic deformation

A

when the material is beyond its elastic limit and the material can no longer return to its original length

51
Q

The adverse effect of an electric shock to an individual is primarily determined by what factor?

A

Amount of current flowing through the body

Physics (9 decks)

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