23. What is the impact of adding cetrimide to an emulsion stabilized with sodium oleate?
    A. Stabilizes the emulsion
    B. Inverts the emulsion type
    C. Prevents microbial growth
    D. Causes cracking (breaking)
    Answer: D

24. Which test involves using a filter paper soaked in cobalt chloride solution?
    A. Conductivity test
    B. Dilution test
    C. Dye solubility test
    D. Cobalt chloride paper test
    Answer: D

25. Which emulsifying agent classification includes benzalkonium chloride?
    A. Synthetic Surface active agents
    B. Semi synthetic agents
    C. Natural agents
    D. Finely divided solid particles
    Answer: A

26. Which step of emulsion preparation involves forming a mucilage or paste with the emulsifier and water?
    A. Bottle Method
    B. Continental Method
    C. Dry Gum Method
    D. Wet Gum Method
    Answer: D

27. What is the most common method for preparing emulsions on a small scale?
    A. Mechanical blender
    B. Porcelain mortar and pestle
    C. Hand homogenizer
    D. Simple prescription bottle
    Answer: B

28. Which term refers to the process of dispersing an emulsion in a secondary aqueous phase to form a multiple emulsion?
    A. Creaming
    B. Flocculation
    C. Coalescence
    D. Multiple emulsion preparation
    Answer: D

29. What type of multiple emulsion is used to separate incompatible hydrophilic substances?
    A. O/W/O
    B. W/O/W
    C. Nanoemulsion
    D. Macroemulsion
    Answer: B

30. What does an O/W emulsion with scarlet red C dye appear under the microscope?
    A. Continuous phase red, scattered globules colorless
    B. Scattered globules red, continuous phase colorless
    C. Both phases red
    D. Both phases colorless
    Answer: B

31. What characteristic of emulsifiers prevents coalescence by forming a rigid interfacial film?
    A. Reduction in interfacial tension
    B. Electrical double layer formation
    C. Mechanical barrier to coalescence
    D. Thermodynamic stabilization
    Answer: C

32. Which preservative is a broad spectrum agent in the mercurials class?
    A. Benzoic acid
    B. Phenol
    C. Chlorhexidine
    D. Phenyl mercuric acetate
    Answer: D

33. What is a key advantage of O/W emulsions for oral administration?
    A. Greasy texture
    B. Improved bioavailability
    C. Short shelf-life
    D. Difficult to mask taste
    Answer: B

34. Which emulsifying agent can be described as a hydrocolloid of animal origin?
    A. Acacia
    B. Agar
    C. Cholesterol
    D. Starch
    Answer: C

35. What type of emulsion is used for the topical application of water-soluble drugs?
    A. W/O
    B. O/W
    C. Multiple
    D. Nanoemulsion
    Answer: B

36. What is a primary use of emulsions in diagnostic purposes?
    A. X-ray examination
    B. Oral administration
    C. Topical application
    D. Depot therapy
    Answer: A

37. What is the effect of the addition of large ions of opposite charge to an emulsion?
    A. Stabilization
    B. Phase inversion
    C. Cracking (Breaking)
    D. Flocculation
    Answer: C

38. Which emulsion instability is due to density differences between the phases?
    A. Coalescence
    B. Flocculation
    C. Sedimentation
    D. Creaming
    Answer: D

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