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FRCA Course Papers > 07. Physics > Flashcards

07. Physics Flashcards

1
Q

T/F:

The value of e in y = ex depends on the units used to measure x.

A

True.

e is a mathematical constant (approximate value 2.71828) and doesn’t change.

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2
Q

T/F:

A minimum point on a curve y = f(x) is defined by dy/dx = 0

A

True.

At both maximum and minimum points, the slope of the curve is 0.

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3
Q

The calculation of cardiac output from a thermodilution curve is an application of differentiation?

A

It is an example of integration.

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4
Q

A picofarad is 10^9 Farad?

A

It is 10^12

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5
Q

Energy = ?

A

force x distance

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6
Q

Force = ?

A

mass x acceleration

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7
Q

Unit of velocity?

A

m/s

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8
Q

Charge = ?

A

current x time

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9
Q

Atmospheric pressure at sea level = ? mmHg = ?mmH2O

A

1 atm = 10 m water pressure = 760 mmHg

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10
Q

Pressure = ?

A

force/area

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11
Q

?atmospheric pressure at sea level

A

101 bar

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12
Q

In considering energy and work:

The kinetic energy contained in 2 kg object moving at a velocity of 4 m/sec is 32 J.

T/F

A

False. Kinetic energy = 0.5 mv^sq = 16 J

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13
Q

Kinetic energy = ?

A

0.5 x mv^sq.

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14
Q

The work done in compressing a ventilator bellows of cross sectional area A, through a pressure differential P through a displacement d is Pd/A? T/F

A

False.

P.A.d

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15
Q

The work done in compressing a gas between two pressures and two volumes is proportional to the slope of the P-V curve between those two points? T/F

A

False.

Area under P-V curve

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16
Q

Triple point of water?

A

It occurs at 0.006 bar and
= 273.16 K
= 0 C

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17
Q

In adiabatic energy exchange in a gas, the temperature remains constant?

A

False.

No temperature change is an isothermal process;

  • adiabatic implies no heat supplied or lost.
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18
Q

Water boils at a temperature which depends on ambient pressure?

T/F

A

TRUE.

As boiling occurs when SVP = ambient pressure.

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19
Q

Critical temp of water?

A

It is 364.10C

20
Q

There is a span of 212 0 Fahrenheit between the ice point and boiling points of water?

T/F

A

span 180 degrees F

21
Q

V directly proportional to T is Charles’ Law?

A

True

22
Q

The Pressure-Temperature curve for a ‘perfect gas’ crosses the Temp axis at 273.16 K?

A

False.

This occurs at
0 kelvin
[-273 celcius]

23
Q

Boyle’s Law written as:

P.V = nRT

represents an isothermal energy change? T/F

A

True

24
Q

P1 V1 = P2 V2 represents what law?

A

Boyles

25
Q

P.Vy = nRT,

where y = ratio of specific heat capacities at constant P and at constant V,

represents an adiabatic energy change? T/F

A

True

26
Q

Critical temperature of O2?

A
  • 116 C
27
Q

Critical temp nitrous oxide?

Does it exist as liquid or gas in temperate climates?

A

36.4 degrees C

Exists as liquid even in temperate regions.

28
Q

What is a critical pressure?

A

The pressure which is required to liquify a gas.

A gas must be below its critical temperature to liquefy it.

29
Q

Boiling of a liquid occurs when SVP = ambient pressure.

T/F?

A

True.

30
Q

Does the output from a vapouriser increase or decrease with higher altitude?

A

It increase

31
Q

TRUE/FALSE:

If the output from a vaporiser changes due to a change of ambient P it does not need recalibrating because the partial pressure of the volatile from the vaporiser is unchanged.

A

True, partial pressure is what matters not the output.

32
Q

The partial pressure in the alveolus of nitrous oxide at 50% concentration in a gas mixture is about 70 kPa?

A

False.

It is about 50% of 101 kPa ie approximately 50kPa

33
Q

TRUE/ FALSE:

Diffusion hypoxia is due to the partial pressure difference of nitrogen between the alveolus and the blood.

A

While this partial pressure difference plays its part, the real cause of diffusion hypoxia is

The difference in SOLUBILITY in plasma between nitrogen and nitrous oxide.

34
Q

Equimolar solutions of sodium chloride and glucose exert similar osmotic pressure.

true/ false?

A

FALSE

  • Since NaCl dissociates into two osmotically active particles, it exerts twice the osmotic pressure of glucose.
35
Q

One mole of any substance in 22.4 L water exerts an osmotic pressure of 1 bar.

T/F?

A

TRUE

36
Q

The addition of a solute to a solvent lowers its SVP in relation to its osmotic pressure.

T/F

A

TRUE

37
Q

What are the most osmotically active components of plasma?

A

Albumin

38
Q

What are bridge circuits used for?

A

Bridge circuits are used primarily to improve accuracy of current outputs when the inputs might be distorted.

39
Q

What voltages does the AC vary between?

A

240 V is the root mean square value; peak to peak is + 340 V to - 340 V

40
Q

In an inductor:

The magnetic field induced in a coil induces a voltage which increases the driving voltage drop the coil?

T/F

A

False,

an inductor induces a VOLTAGE that OPPOSES the driving force.

41
Q

With regards to inductors, is current proportional to frequency?

A

No, voltage is proportional to frequency.

42
Q

With regards to inductors:

The time constant of a circuit containing L and R = L.R?

A

time constant = L/R

43
Q

Operational amplifiers:

Designed to have high output resistance?

A

No,

high input resistance.

44
Q

Operational amplifiers:

Can be used with single or double inputs? T/F

A

Cannot use single.

Single inputs mean the output is prone to noise.

45
Q

Operational amplifiers:

Are similar op-amp circuitry can be used for ECG, EEG and EMG?

A

No, these all have different amplitudes and frequencies.

46
Q

Is laser monochromatic or dichromatic?

A

Monochromatic

47
Q

TRUE/ FALSE:

A Nd YAG laser is used to coagulate tissue?

A

TRUE

FRCA Course Papers (15 decks)

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