Physics and Clinical Measurement

Summary

Q 1. With respect to damping

1. A. Damping does not apply to electrical devices

2. B. Damping affects the step response of the system

3. C. Underdamping results in overestimation

4. D. Overdamping results in overestimation

5. E. Critical damping refers to the fastest steady state reading of the system with no oscillation

Q 2. Concerning the gas laws

1. A. Boyle's law refers to the relationship between temperature and pressure of a gas

2. B. Temperature is measured on the absolute temperature scale

3. C. Temperature is a constant in Charles’ law

4. D. Boyle's law states that at a constant volume, pressure varies with temperature

5. E. The gas laws are only true for air

Q 3. The critical temperature of a gas is that

1. A. Below which it solidifies

2. B. Above which it will not liquefy despite increased pressure

3. C. At which it sublimes

4. D. At which it liquefies if pressure is decreased

5. E. At which kinetic energy is zero

Q 4. The following are correct SI Units

1. A. The unit of energy is newton

2. B. The unit of power is watt

3. C. The unit of frequency is hertz

4. D. The unit of mass is gram

5. E. The unit of length is metre

Q 5. The peak expiratory flow rate (PEFR)

1. A. In normal adults is often more than 500 l/min

2. B. Can be measured by a pneumotachograph

3. C. Can be measured by the Wright's peak flow meter

4. D. Increases with age

5. E. Can be improved by training

Q 6. The amount of gas dissolved in a liquid

1. A. Increases as the temperature of the liquid increases

2. B. Is proportional to the pressure of the gas in contact with the liquid

3. C. Is influenced by the presence of other dissolved gases

4. D. Exerts the same ‘tension’ as the partial pressure of the gas in contact with the liquid at equilibrium

5. E. Is proportional to the molecular weight of the gas