Chapter 4 Multiple Choice Questions

* not completed

. Under the ideal gas laws, which of the following is NOT a correct assumption

Molecules occupy a negligible volume correct incorrect

Gas volume are insensitive to changes in pressure correct incorrect

No energy is lost when molecules collide correct incorrect

Forces between molecules are insignificant correct incorrect

* not completed

. Boyle's law describes:

The relationship between pressure and temperature for ideal gases correct incorrect

The determinants of the universal gas constant correct incorrect

The relationship between pressure and volume for ideal gases correct incorrect

The relationship between temperature and volume for ideal gases correct incorrect

* not completed

. Which of the following is NOT true of Raoult's law

Raoult's law applies to miscible solvents in a closed system correct incorrect

The toluene-benzene mixtures obey Raoult's law correct incorrect

A pharmaceutical application of Raoult's law is the formulation of pressurised metered dose inhalers correct incorrect

The behaviour predicted by Raoult's law is independent of inter-molecular forces correct incorrect

* not completed

. Gases do NOT have a role in which of the following pharmaceutical operations

Surface area measurement correct incorrect

Lyophilization correct incorrect

Distillation correct incorrect

Melting correct incorrect

* not completed

. Which of the following is NOT correct regarding Entonox?

Entonox is a 50:50 mixture of nitrous oxide and oxygen correct incorrect

Entonox is used to provide light anaesthesia correct incorrect

At temperatures below -6^oC, the NO₂ in Entonox will selectively liquefy correct incorrect

If an Entonox cylinder is exposed to temperature below the critical temperature for the gas, it should be discarded correct incorrect

* not completed

. For an aerosol inhaled to the lungs, which of the following is NOT true?

Airflow becomes faster and more turbulent the more deeply it penetrates the lungs correct incorrect

Particles of 5 μm and above impact in the proximal airways correct incorrect

Sedimentation is the major mechanism of deposition for particles between 0.5-3 μm correct incorrect

Breath-holding will enhance deposition of sub-micron particles by diffusion correct incorrect

* not completed

. For pressurised metered dose inhalers (pMDI) which of the following is NOT true?

pMDI emit aerosols at high velocity correct incorrect

pMDI use liquefied gases as propellants correct incorrect

pMDI may be formulated as solutions or suspensions correct incorrect

pMDI cannot be used with spacers correct incorrect

* not completed

. Which of the following is NOT true of a typical dry powder inhaler (DPI)?

DPI are difficult for patients to coordinate correct incorrect

DPI require high velocity airflow through the device to aerosolise the powder correct incorrect

DPI liberate fine powder particles from carrier particles upon inhalation correct incorrect

DPI may contain the powder in a unit dose or reservoir correct incorrect

* not completed

. Which of the following is NOT true of jet nebulisers?

Jet nebulisers produce mists correct incorrect

Jet nebulisers use high velocity gas flows to generate the Venturi effect to draw solution into the airflow correct incorrect

Jet nebulisers induce an decrease in the temperature of the nebuliser solution during operation correct incorrect

Jet nebulisers use ultrasonic forces to produce the aerosol correct incorrect

* not completed

. Which of the following is NOT true of ultrasonic nebulisers?

Ultrasonic nebulisers use piezoelectric crystals vibrating at high frequency to produce aerosols correct incorrect

Ultrasonic nebulisers rely on heat to thermally-generate an aerosol correct incorrect

Ultrasonic nebulisers may not be suitable for formulation of biopharmaceuticals that are degraded by heat correct incorrect

Ultrasonic nebulisers produce aerosols from carefully formulated nebuliser solutions correct incorrect