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WorksheetsPre test physics part 2
Total questions: 10
Worksheet time: 10mins
The mean noise level in the operating rooms in various studies is around
65–60 dB but it may even exceed 100 dB
25 – 45 dB
250 – 450 dB
160 – 220 dB
6- Boyle’s law
At a constant volume, the absolute pressure of a fixed mass of gas is directly proportional to the absolute temperature
At a constant pressure, the volume of a fixed mass of gas is directly proportional to the absolute temperature
The pressure exerted by a fixed mass of gas in a mixture of gases is the same as the pressure it would exert alone
At a constant temperature, the volume of a fixed mass of gas is inversely proportional to the absolute pressure
Regarding Diathermy safety
Ohm’s law states that current = voltage x resistance
Diathermy works because there is a high current density at the active electrode
The heat energy produced by cautery is proportional to the current at the tip of the active electrode
Bipolar diathermy requires a passive electrode (‘diathermy plate’)
When the relative humidity is 100% then
relative humidity and absolute humidity are equal
relative humidity and specific humidity are equal
the relative humidity will decrease if the temperature decreases
a patient’s perspiration will not evaporate
With regard to electrical safety and prevention of explosions
A. Anaesthetic machines should be isolated from ‘earth’ to prevent completion of an electrical circuit.
Currents of 10 microamps may initiate ventricular fibrillation
The neutral connection of a circuit is not at earth potential at the patient end of the circuit
In surgical diathermy the heat released depends on the square of the potential difference between electrodes
Heat and moisture exchangers are contra-indicated when patients have:
Copious secretions.
Hypothermia.
Hyperthermia.
Tenacious sputum.
Which is true about heat loss
Conduction is the largest factor in patient heat loss
Radiation accounts for about 10% of the total heat loss
Convection is due to heating of the adjacent air layer which is replaced by cooler air from the surroundings
Heat lost in breathing dry gases is approximately 30% of total heat loss in the anesthetized subject
The current delivered to the patient by an electrocautery device differs from the current supplied by an electrical utility in its
capacitance
frequency
amperage
voltage
The National Fire Protection Association mandates which one of these standards for operating rooms?
Isolated power is required in all operating rooms
Isolated power is required in areas designated as wet locations
In the event of a power failure, emergency power must become operative within 1 second
When isolated power is p resent, a line isolation monitor must also be present
Concerning humidity and humidification of gases
Relative humidity is the ratio of absolute humidity to saturated humidity at a specified temperature
Operating theatre humididty should be maintained at no more than 30%
Heat and moisture exchangers can't achieve 50% humidity
A nebuliser works on the poiseuille effect to entrain water across a pressure drop
