07. Physics

Question 1

T/F:

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

Answer 1

True.

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

Question 2

T/F:

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

Answer 2

True.

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

Question 3

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

Answer 3

It is an example of integration.

Question 4

A picofarad is 10^9 Farad?

Answer 4

It is 10^12

Question 5

Energy = ?

Answer 5

force x distance

Question 6

Force = ?

Answer 6

mass x acceleration

Question 7

Unit of velocity?

Answer 7

m/s

Question 8

Charge = ?

Answer 8

current x time

Question 9

Atmospheric pressure at sea level = ? mmHg = ?mmH2O

Answer 9

1 atm = 10 m water pressure = 760 mmHg

Question 10

Pressure = ?

Answer 10

force/area

Question 11

?atmospheric pressure at sea level

Answer 11

101 bar

Question 12

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

Answer 12

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

Question 13

Kinetic energy = ?

Answer 13

0.5 x mv^sq.

Question 14

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

Answer 14

False.

P.A.d

Question 15

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

Answer 15

False.

Area under P-V curve

Question 16

Triple point of water?

Answer 16

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

Question 17

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

Answer 17

False.

No temperature change is an isothermal process;

• adiabatic implies no heat supplied or lost.

Question 18

Water boils at a temperature which depends on ambient pressure?

T/F

Answer 18

TRUE.

As boiling occurs when SVP = ambient pressure.

Question 19

Critical temp of water?

Answer 19

It is 364.10C

Question 20

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

T/F

Answer 20

span 180 degrees F

Question 21

V directly proportional to T is Charles’ Law?

Answer 21

True

Question 22

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

Answer 22

False.

This occurs at
0 kelvin
[-273 celcius]

Question 23

Boyle’s Law written as:

P.V = nRT

represents an isothermal energy change? T/F

Answer 23

True

Question 24

P1 V1 = P2 V2 represents what law?

Answer 24

Boyles

Question 25

P.Vy = nRT, where y = ratio of specific heat capacities at constant P and at constant V, represents an adiabatic energy change? T/F

Answer 25

True

Question 26

Critical temperature of O2?

Answer 26

- 116 C

Question 27

Critical temp nitrous oxide? Does it exist as liquid or gas in temperate climates?

Answer 27

36.4 degrees C Exists as liquid even in temperate regions.

Question 28

What is a critical pressure?

Answer 28

The pressure which is required to liquify a gas. A gas must be below its critical temperature to liquefy it.

Question 29

Boiling of a liquid occurs when SVP = ambient pressure. T/F?

Answer 29

True.

Question 30

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

Answer 30

It increase

Question 31

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.

Answer 31

True, partial pressure is what matters not the output.

Question 32

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

Answer 32

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

Question 33

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

Answer 33

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.

Question 34

Equimolar solutions of sodium chloride and glucose exert similar osmotic pressure. true/ false?

Answer 34

FALSE - Since NaCl dissociates into two osmotically active particles, it exerts twice the osmotic pressure of glucose.

Question 35

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

Answer 35

TRUE

Question 36

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

Answer 36

TRUE

Question 37

What are the most osmotically active components of plasma?

Answer 37

Albumin

Question 38

What are bridge circuits used for?

Answer 38

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

Question 39

What voltages does the AC vary between?

Answer 39

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

Question 40

In an inductor: The magnetic field induced in a coil induces a voltage which increases the driving voltage drop the coil? T/F

Answer 40

False, an inductor induces a VOLTAGE that OPPOSES the driving force.

Question 41

With regards to inductors, is current proportional to frequency?

Answer 41

No, voltage is proportional to frequency.

Question 42

With regards to inductors: The time constant of a circuit containing L and R = L.R?

Answer 42

time constant = L/R

Question 43

Operational amplifiers: | Designed to have high output resistance?

Answer 43

No, high input resistance.

Question 44

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

Answer 44

Cannot use single. Single inputs mean the output is prone to noise.

Question 45

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

Answer 45

No, these all have different amplitudes and frequencies.

Question 46

Is laser monochromatic or dichromatic?

Answer 46

Monochromatic

Question 47

TRUE/ FALSE: A Nd YAG laser is used to coagulate tissue?

Answer 47

TRUE