PHARMACEUTICS MCQ AND NPC EXAM DAILY SERIES 29

[PHARMACEUTICS]

1. How surfactants will facilitate or aid wetting of hydrophobic materials in liquid

A. By decreasing the solid-liquid interfacial tension

B. By increasing the solid-liquid interfacial tension

C. Both

D. None

2. The stability of suspensions can be evaluated by

A. Sedimentation volume

B. Degree of flocculation

C. Re-dispersibility

D. All

3. To identify the emulsion type, which of the following tests are conducted?

A. Dilution test

B. Dye test

C. Conductivity test

D. All

4. Stoke’s equation is expressed as 

A. V = 2r^2(d1–d2)g/18η

B. V = 2r^2 (d1–d2)g/9η 

C. Both 

D. None

5. The temperature at which the inversion occurs depends on emulsifier concentration is known  as

A. Phage temperature

B. Inversion temperature

C. Phase inversion temperature

D. All

6. Which of the following mechanical equipment can be used for emulsification?

A. Homogenizers

B. Mechanical stirrers

C. Ultrasonifiers

D. All

7. Which of the following is not used as a emulsifying agent?

A. Surfactant

B. Hydrophilic colloids

C. Electrolytes

D. Finely divided solids

8. HLB system was developed by

A. Griffin

B. Stock’s

C. Dalla Valle

D. None

9. Gum Arabic is a

A. Anionic polysaccharide

B. Cationic polysaccharide

C. Neutral polysaccharide

D. None

10. Which of the following is not a semisolid dosage form 

A. Paste

B. Creams 

C. Ointments

D. Suspensions

11. Generally pastes contain 

A. High percentage of insoluble solids

B. Low percentage of insoluble solids 

C. Both 

D. None

12. Most widely used hydrocarbon in semisolid dosage forms

A. Petrolatum

B. Mineral oil 

C. Both

D. None

13. Which of the following hydrocarbon waxes are employed in the manufacture of creams and ointments? 

A. Paraffin wax

B. Ceresin 

C. Both

D. None

14. Which of the following is not a vegetable oil 

A. Peanut oil

B. Almond oil 

C. Olive oil

D. Petrolatum

15. Which of the following fatty acid used in water removable creams as emulsifier?

A. Palmitic acid 

B. Stearic acid

C. Both

D. None

1. How do surfactants help in wetting hydrophobic materials in liquids?

Surfactants decrease the solid-liquid interfacial tension, allowing better wetting of hydrophobic materials.

2. How can the stability of suspensions be evaluated?

Suspension stability can be evaluated by:
– Sedimentation volume
– Degree of flocculation
– Re-dispersibility
– All of the above (Correct Answer)

3. Which tests help identify the type of emulsion?

The Dilution test, Dye test, and Conductivity test are used to determine whether an emulsion is oil-in-water (O/W) or water-in-oil (W/O).

4. What is Stoke’s equation for sedimentation rate?

Stoke’s equation is expressed as:
V = 2r² (d₁–d₂) g / 9η

5. What is Phase Inversion Temperature (PIT)?

PIT is the temperature at which the emulsion inverts from oil-in-water (O/W) to water-in-oil (W/O) or vice versa, depending on emulsifier concentration.

6. What mechanical equipment is used for emulsification?

Common emulsification equipment includes:
– Homogenizers
– Mechanical stirrers
– Ultrasonifiers

7. Which of the following is not an emulsifying agent?

Electrolytes are not used as emulsifying agents.

8. Who developed the HLB system?

The Hydrophilic-Lipophilic Balance (HLB) system was developed by Griffin.

9. What type of polysaccharide is Gum Arabic?

Gum Arabic is an anionic polysaccharide.

10. Which of the following is not a semisolid dosage form?

Suspensions are not semisolid dosage forms.

11. What do pastes generally contain?

Pastes typically contain a high percentage of insoluble solids for better skin adhesion.

12. What is the most widely used hydrocarbon in semisolid dosage forms?

Petrolatum and mineral oil are commonly used hydrocarbons in ointments and creams.

13. Which hydrocarbon waxes are used in cream and ointment manufacturing?

Commonly used hydrocarbon waxes include:
– Paraffin wax
– Ceresin

14. Which of the following is not a vegetable oil?

Petrolatum is not a vegetable oil, while peanut, almond, and olive oils are.

15. Which fatty acids are used as emulsifiers in water-removable creams?

Stearic acid and palmitic acid are commonly used emulsifiers in creams.

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