MCQOPTIONS
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MCQOPTIONS
This section includes 587 Mcqs, each offering curated multiple-choice questions to sharpen your Medical Subjects knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following will produce the most rigid restoration for framework of same dimension ? |
| A. | Wrought alloy |
| B. | Palladium alloys |
| C. | Cobalt-chrome alloys |
| D. | Partial denture casting gold in hardened condition |
| Answer» D. Partial denture casting gold in hardened condition | |
| 2. |
Which of the following zones is used for melting alloy during casting______________? |
| A. | Reducing flame |
| B. | Oxidizing flame |
| C. | Green flame |
| D. | All of the above |
| Answer» B. Oxidizing flame | |
| 3. |
Which of the waxes are derived from the lignite_________________? |
| A. | Paraffin wax |
| B. | Inlay wax |
| C. | Microcrystalline wax |
| D. | Montan wax |
| Answer» E. | |
| 4. |
Which one of the following categories of dental materials has the highest thermal conductivity_________________? |
| A. | Unfilled acrylic plastics |
| B. | Gold alloys |
| C. | Porcelains |
| D. | Zinc phosphate cements |
| Answer» C. Porcelains | |
| 5. |
Which one of the following dental cement accelerates the formation of reparative dentin ? |
| A. | Eugenol |
| B. | Calcium Hydroxide |
| C. | Zinc oxide |
| D. | Silica |
| Answer» C. Zinc oxide | |
| 6. |
Which one of the following dental cements does not contain water as part of the composition of the liquid component ? |
| A. | Zinc Phosphate cement |
| B. | Zinc oxide equgenol cement |
| C. | Zinc silicophosphate cement |
| D. | Zinc polycarboxylate cement |
| Answer» C. Zinc silicophosphate cement | |
| 7. |
Which one of the following elements is NOT added is small amount to be used as grain refiners ? |
| A. | Iridium |
| B. | Ruthinium |
| C. | Indium |
| D. | Platinum |
| Answer» E. | |
| 8. |
Which one of the following impression materials is elastic, sets by a chemical reaction and is catalyzed by chloroplatinic acid_______________? |
| A. | Condensation silicone |
| B. | Polyether |
| C. | Polysulfide |
| D. | Poly vinyl siloxane |
| Answer» E. | |
| 9. |
Which one of the following increase the strength and reduce viscosity of agar hydrocolloid impression material_____________? |
| A. | Borax |
| B. | Water |
| C. | Sulfates |
| D. | Carbonates |
| Answer» B. Water | |
| 10. |
Which one of the following is most elastic ? |
| A. | a titanium |
| B. | B titanium |
| C. | Chrome-cobalt-nickel |
| D. | Nickel-titanium |
| Answer» E. | |
| 11. |
Which one of the following is not an objective of trituration ? |
| A. | Remove oxides from powder particle surface |
| B. | Keep the amount of gamma-1 or gamma-2 matrix crystals to maximum |
| C. | Pulverize pelletes into particles to aid in attack by mercury |
| D. | Achieve a workable mass of amalgam in minimum time |
| Answer» C. Pulverize pelletes into particles to aid in attack by mercury | |
| 12. |
Which one of the following is the result of applying a load to a wire below its modulus of elasticity on a load deflection diagram ? |
| A. | Fracture of the wire |
| B. | permanent deformation |
| C. | Spring back |
| D. | Increase in stiffness |
| Answer» D. Increase in stiffness | |
| 13. |
Which one of the following is used as filler in composite resins ? |
| A. | Quartz |
| B. | Silicates |
| C. | Zinc particles |
| D. | Aluminium |
| Answer» B. Silicates | |
| 14. |
Which one of the following restorative materials is having coefficient of thermal expansion close to that of tooth enamel and dentin ? |
| A. | Microfilled composite resins |
| B. | Pure gold |
| C. | Silver amalgam |
| D. | Type II Glass ionomer cement |
| Answer» E. | |
| 15. |
Which phase provides maximum strength in hardened mercury/silver alloy ? |
| A. | Silver / Mercury phase |
| B. | Silver / Tin phase |
| C. | Tin / Mercury phase |
| D. | Zinc / Mercury phase |
| Answer» C. Tin / Mercury phase | |
| 16. |
Which zone is the hottest and efficient burning zone of the flame used for casting ? |
| A. | Oxidizing zone |
| B. | Reducing zone |
| C. | Combustion zone |
| D. | None of the above |
| Answer» B. Reducing zone | |
| 17. |
White gold alloy predominantly is______________? |
| A. | Gold added with palladium |
| B. | Gold added with calcium |
| C. | Gold with much of chromium |
| D. | Gold with silver |
| Answer» B. Gold added with calcium | |
| 18. |
Who was the first person to introduce cast inlay restoration into dentistry ? |
| A. | William H Taggart |
| B. | Buonocore |
| C. | G.V. Black |
| D. | Bowen |
| Answer» B. Buonocore | |
| 19. |
Why GIC is best restorative material in children_____________? |
| A. | High strength |
| B. | Good marginal integrity |
| C. | It can bond enamel & dentin |
| D. | It has less occlusal wear |
| Answer» D. It has less occlusal wear | |
| 20. |
With indirect spruing. Which one of the following porosities can be minimised_______________? |
| A. | Back pressure porosity |
| B. | Localized shrinkage porosity |
| C. | Pin hole porosity |
| D. | Micro porosity |
| Answer» C. Pin hole porosity | |
| 21. |
Within an hour after cementation of cast gold onlay patient complains of shooting pain every time the teeth comes together Most probable explanation is ______________? |
| A. | Supracocclusion of restoration |
| B. | Retained cement in gingival sulcus |
| C. | Excess acid in mix |
| D. | Galvanic current caused by gold onlay occluding with a large restoration |
| Answer» E. | |
| 22. |
Which of the following statements about high copper silver alloy compared to conventional alloy is not true ? |
| A. | It has increased tensile and compressive strength |
| B. | It has poor tarnish and corrosion resistance |
| C. | It’s edge strength is greater |
| D. | Mercury content in the final restoration is less |
| Answer» C. It’s edge strength is greater | |
| 23. |
Which of the following statement is true regarding lathe cut low Copper silver alloy ? |
| A. | Requires least amount of mercury |
| B. | Achieves high compressive strength at 1 hr. |
| C. | Has tensile strength both at 15 minutes and 7 days is comparable to high copper, unicompositional alloys |
| D. | Has lower cree value |
| Answer» D. Has lower cree value | |
| 24. |
Which of the following silver amalgam alloy have the maximum strength________________? |
| A. | Lathe cut |
| B. | Spherical |
| C. | Admixed |
| D. | Single composition |
| Answer» E. | |
| 25. |
Which of the following show chemical bond with enamel (Calcified tissues)______________? |
| A. | Composites |
| B. | Direct filling resins |
| C. | Polycarboxylate cements |
| D. | BIS-GMA resins in pit and fissure sealants |
| Answer» D. BIS-GMA resins in pit and fissure sealants | |
| 26. |
Which of the following releases single wavelength of energy ? |
| A. | QTH |
| B. | PAC |
| C. | LED |
| D. | Argon lasers |
| Answer» E. | |
| 27. |
Which of the following refractory is used to counteract most of the expansion________________? |
| A. | Quartz |
| B. | Cristobalite |
| C. | Tridymite |
| D. | Corundum |
| Answer» C. Tridymite | |
| 28. |
Which of the following provide opacity to composite ? |
| A. | TEGDMA |
| B. | BIS-GMA |
| C. | Ti02 |
| D. | None of the above |
| Answer» D. None of the above | |
| 29. |
Which of the following properties of dental materials is time dependent_______________? |
| A. | Creep |
| B. | Resillience |
| C. | Elastic limit |
| D. | Ultimate strength |
| Answer» B. Resillience | |
| 30. |
Which of the following procedure is indicated to produce cross-linking in the polymerization of linear chains of acrylic_______________? |
| A. | Addition of grain refining agents |
| B. | Addition of difunctional monomers |
| C. | Increasing the amount of heat required for linear polymerization |
| D. | Incorporation of terminating agents |
| Answer» C. Increasing the amount of heat required for linear polymerization | |
| 31. |
Which of the following physical property can be used to estimate indirectly the proportional limit of gold alloys ? |
| A. | Vickers’s hardness number |
| B. | Knoop hardness number |
| C. | Brinell hardness number |
| D. | Rockwell hardness number |
| Answer» D. Rockwell hardness number | |
| 32. |
Which of the following phases of dental amalgam has minimum strength____________? |
| A. | Gamma 1 |
| B. | Gamma 2 |
| C. | Epsilon 1 |
| D. | Gamma 3 |
| Answer» C. Epsilon 1 | |
| 33. |
Which of the following may result if an excessive amount of monomer is incorporated into an acrylic resin mixture ? |
| A. | Excessive expansion |
| B. | Low impact strength |
| C. | Excessive shrinkage |
| D. | Excessive brittleness |
| Answer» D. Excessive brittleness | |
| 34. |
Which of the following is used as surface hardener in Impression material ? |
| A. | 2% Potassium sulfate |
| B. | 0.2% Potassium sulfate |
| C. | 2% sodium sulfate |
| D. | 4% Potassium sulfate |
| Answer» B. 0.2% Potassium sulfate | |
| 35. |
Which of the following is true about direct filling gold______________? |
| A. | Properly condensed mat gold has no voids |
| B. | Whatever may be the type voids are inherent |
| C. | Voids can be avoided with manual condensation |
| D. | None of the above |
| Answer» C. Voids can be avoided with manual condensation | |
| 36. |
Which of the following is true about Agar hydrocolloid impression material ? |
| A. | Liquefies between 71 – 100°C |
| B. | Solidfies between 50 – 70°C |
| C. | Facilitates fabrication of metal dyes |
| D. | Cannot register fine surface details |
| Answer» B. Solidfies between 50 – 70°C | |
| 37. |
Which of the following is the main constituent of porcelain__________________? |
| A. | Feldspar |
| B. | Kaolin |
| C. | Quartz |
| D. | Clay |
| Answer» B. Kaolin | |
| 38. |
Which of the following is present in the powder of the acrylic resin______________? |
| A. | Methyl methacrylate |
| B. | Benzoyl peroxide |
| C. | Hydroquinone |
| D. | D-methyl paratolouidine |
| Answer» B. Benzoyl peroxide | |
| 39. |
Which of the following is NOT true of polymethyl methacrylate ? |
| A. | Knoop hardness number 18 to 20 |
| B. | Tensile strength of 60 MPa |
| C. | Density of 1.13 g/cm3 |
| D. | Modulus of elasticity of 3.4 GPa |
| Answer» E. | |
| 40. |
Which of the following is not true about elastomeric impression ? |
| A. | Single mix material have higher viscosity |
| B. | Shear thinning is related to viscosity of non phase impression material |
| C. | Improper mixing of material can cause permanent deformation of impression |
| D. | Putty – wash technique of impression reduces dimensional change of setting |
| Answer» B. Shear thinning is related to viscosity of non phase impression material | |
| 41. |
Which of the following is not affected by saliva ? |
| A. | Impression plaster |
| B. | Impression paste |
| C. | Silicon impression material |
| D. | None of the above |
| Answer» E. | |
| 42. |
Which of the following is most important in strength ZOE_____________? |
| A. | Liquid powder ratio |
| B. | Temperature of mixing stab |
| C. | Speed of mixing |
| D. | Addition of few drops of water |
| Answer» B. Temperature of mixing stab | |
| 43. |
Which of the following is function of fluoride flux in soldering process ? |
| A. | It prevents the formation of copper oxide |
| B. | It prevents the formation of chromium oxide or dissolves chromic oxide layer |
| C. | It prevents the flow of material in undesirable area |
| D. | Increase the strength of solder |
| Answer» C. It prevents the flow of material in undesirable area | |
| 44. |
Which of the following is correct________________? |
| A. | Type I and Type II gold can be heat treated and annealed |
| B. | Type III and Type IV gold can be heat treated and annealed |
| C. | Type I and IV gold can be heat treated and annealed |
| D. | All the type of gold can be heat treated and annealed |
| Answer» C. Type I and IV gold can be heat treated and annealed | |
| 45. |
Which of the following is correct regarding chemical setting of condensation silicone_______________? |
| A. | Polymerization occurs with repeated elimination of small molecules |
| B. | Polymerization occurs with elimination of single byproduct |
| C. | By condensation of repeated molecules of monomers |
| D. | Condensation does not occur at all |
| Answer» B. Polymerization occurs with elimination of single byproduct | |
| 46. |
Which of the following is correct glass transition temperature of Impression compound ? |
| A. | 43.5°C |
| B. | 39°C |
| C. | 65°C |
| D. | 100°C |
| Answer» C. 65°C | |
| 47. |
Which of the following is correct arrangement of impression material regarding linear contraction in ascending order ? |
| A. | Addition silicone < polyether < polysulfide < condensation silicone |
| B. | Addition silicone < polysulfide < Polyether < condensation silicone |
| C. | condensation silicone < polyether < polysulfide < Addition silicone |
| D. | condensation silicone < polysulfide < polyether < Addition silicone |
| Answer» B. Addition silicone < polysulfide < Polyether < condensation silicone | |
| 48. |
Which of the following is common to both zinc eugenol cement and polycarboxylate cement? |
| A. | Polyacrylic acid is liquid |
| B. | Chemical bond to tooth structure |
| C. | Chelation |
| D. | Substitution o eugenol by EBA to increase strength of cement |
| Answer» D. Substitution o eugenol by EBA to increase strength of cement | |
| 49. |
Which of the following is an example of a composite material ? |
| A. | A filled resin |
| B. | Colloidal silica |
| C. | Gold alloy |
| D. | Wax |
| Answer» B. Colloidal silica | |
| 50. |
Which of the following inhibitor accelerator system uses light activation composite ? |
| A. | Diketone-amine |
| B. | Organic acid-metal oxide |
| C. | Organic acid-peroxide |
| D. | Peroxide-amine |
| Answer» B. Organic acid-metal oxide | |