Free Dental MCQs Mock Test Online with Answers

Q1 : Palatal secretions affect the setting of all the impression materials except_______________?

A: Silicone B: Agar-agar C: Impression paste D: Impression plaster

Q2 : The impression for a diagnostic cast of a partial edentulous mouth should be taken in_______________?

A: Impression wax B: Modelling compound C: Hydro-colloid D: Hydro cal

Q3 : Back pressure porosity can be avoided by________________?

A: Using asbestos linear B: Placing the sprue at least one quarter inch away form the end of casting ring C: Preventing rapid heating the investment in burnout oven D: Using a short and wide sprue

Q4 : Coefficienty of thermal expansion of tooth enamel is closest to_______________?

A: Slicate cement B: Composite C: GIC D: Polycarboxylate

Q5 : Which of the following properties of dental materials is time dependent_______________?

A: Creep B: Resillience C: Elastic limit D: Ultimate strength

Q6 : What is the disadvantage of using composites as restorative material ?

A: Increased thermal conductivity B: Decreased wear resistance C: Decreased thermal conductivity D: None of the above

Q7 : Coefficient of thermal expansion of which of following is most similar to that of tooth ?

A: Gold inlay B: Acrylic resin C: Silicate cement D: Gold foil

Q8 : In a metal ceramic crown for a FPD the function of tin, indium which are readily oxidized minor constituents is to________________?

A: Improve bonding B: Decrease porosity C: They react with the porcelain opaque layer, which masks the metal D: Improves the thermal expansion between the metal and porcelain

Q9 : Boiling point of methyl methacrylate________________?

A: B.P of water B: < B.P of water C: Equal of BP of water D: Is at normal room temperature

Q10 : The elastic of plastic deformation to fracture a material is its_______________?

A: Toughness B: Brittleness C: Young’s modulus D: Proportional limit

Q11 : Gap between true end of casting ring and wax pattern should be______________?

A: ¼ inch B: ½ inch C: 3/8 inch D: one inch

Q12 : Which of the following fuel gases used for soldering, has the highest heat content______________?

A: Hydrogen B: Natural gas C: Acetylene D: Propane

Q13 : Dentin conditioner has the following function______________?

A: Removes smear layer B: Increases surface energy of dentin C: Forms a thin resin layer over exposed collagen fibrils D: Helps in bonding with composite

Q14 : When making a polysulphide impression for a caste crown, custom trays are usually preferred over stock trays for all of the following reasons except_______________?

A: Custom trays facilitate uniform contraction of impression material B: Custom trays require less impression material C: Stock trays may be short in the flange area D: Impressions made n the custom trays are easier to remove from the mouth

Q15 : All of the following statements about cast cobalt alloy are true EXCEPT_____________?

A: They have a modulus of elasticity twice that of gold alloys B: They are more rigid than gold alloys C: They have higher ductility than gold alloys D: They have a lower proportional limit than gold alloys

Q16 : The component in very minor quantity in stainless steel that changes the properties to a maximum level is____________?

A: Carbon B: Molybdenum C: Chromium D: Nickel

Q17 : Acid-etching is done for_______________?

A: 30 seconds B: 60 seconds C: 90 seconds D: 120 seconds

Q18 : The most common coupling agents are organic silicon compound called_______________?

A: Parabane B: Ligane C: Silane D: Chelane

Q19 : Type I and Type II zinc oxide impression paste differ with respect to_______________?

A: Their use B: Their hardness after setting C: Water content D: Eugenol content

Q20 : Space lattice refers to_______________?

A: Inter atomic movement B: Inter atomic imbalance C: Arrangement of atoms D: Arrangement of molecules

Q21 : The yield strength of AUstenite (NiTi alloy) is______________?

A: 100 Mpa B: 240 Mpa C: 560 Mpa D: 700 Mpa

Q22 : The point at which a stress of a material exhibits a specific limited deviation P is called_______________?

A: Proportional limit B: Tensile strength C: Ultimate strength D: Yield strength

Q23 : 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

Q24 : About polymerization shrinkage of composite all are true, except______________?

A: Polymerization shrinkage is greater if bonded surface area is lesser than unbounded surface area B: Polymerization shrinkage is high if within the enamel margins C: Acid etching and priming will decrease polymerization shrinkage D: Microleakage can occur because of polymerization shrinkage

Q25 : The rate of tarnish and corrosion of class II cast material having VHN 200 is_______________?

A: 0% B: 2 to 3% C: 5 to 10% D: <1%

Q26 : To cure a heat cure resin, a proper heating cycle is necessary_____________?

A: To prevent the porosity B: To prevent warpage C: To prevent volume expansion D: All of the above

Q27 : 4th state of matter is______________?

A: Solid B: Liquid C: Gas D: Colloid

Q28 : A common electrolyte used for plating copper indirect dies is_______________?

A: Copper cynide B: Ionic copper C: Ionic copper D: Silver cyanide

Q29 : The standard perforated tray for us with alginate impression materials may be brought to more customized contour by_______________?

A: Utility wax B: Base plate wax C: Beading wax D: Boxing wax

Q30 : Non metal which conducts elactricity______________?

A: Graphite B: Carbon C: Acrylic D: Porcelain

Q31 : Component of inlay wax which makes it flake resistant is_____________?

A: Paraffin B: Carnauba C: Gum dammar D: Canadelila

Q32 : Softening heat treatment of alloy increases_________________?

A: Tensile strength B: Proportional limit C: Ductility D: Hardness

Q33 : Which of the following is not affected by saliva ?

A: Impression plaster B: Impression paste C: Silicon impression material D: None of the above

Q34 : The term given to the phenomenon of moisture absorption by an alginate impression in________________?

A: Imbibition B: Syneresis C: Hysteresis D: Gelation

Q35 : A restorative material which has a high proportional limit, compared with one with a lower proportional limit would have________________?

A: Greater ductility B: Greater toughness C: A higher modulus of elasticity D: More resistance to permanent deformation

Q36 : The solvent flux used for base metal soldering is_______________?

A: Boric acid B: Borax C: Fluoride D: Rouge

Q37 : Silica sol__________________?

A: Is applied to the walls of the investment to produce hygroscopic expansion B: Increase the strength and the setting expansion of the phosphate-bonded investment C: Acts as a retarder in the silica bonded investments D: Acts as a refractory in the Silica bonded investments

Q38 : A material which is a mixture of two different materials and its properties are_____________?

A: Composite B: Complex material C: Combined D: Compound

Q39 : 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

Q40 : Inadequate pressure application during flasking_______________?

A: Increases vertical dimension B: Causes teeth to be shrunken in investment C: Causes poor quality of colour D: Causes fracture of denture

Q41 : Polysulfide material is routinely not recommended because of_______________?

A: Unpleasant odor and taste B: Low accuracy C: Least permanent deformation D: Highest curing shrinkage

Q42 : Stabilization of stainless steel is achieved by adding____________?

A: Carbon B: Chromium C: Nickel D: Titanium

Q43 : The melting point of silver is_____________?

A: 1063° centigrade B: 960° Centigrade C: 960° Centigrade D: 1123° Centrigrade

Q44 : Silver plated dyes use an electrolytic bath of_______________?

A: Silver fluorides B: Silver cyanide C: Silver bromide D: Silver iodide

Q45 : Impression material that Do NOT harden by chemical reaction_______________?

A: Zinc oxide eugenol B: Impression compound C: Alginate D: Plaster of paris

Q46 : The wetting of an adherent surface by an adhesive is related to________________?

A: . Surface energy of the adherent B: Surface texture of the adherent C: Surface tension of the adherent D: Nature of the adherent that is crystalline or amorphous

Q47 : The modulus of elasticity is defined as_______________?

A: The stress at the proportional limit B: The strain at the proportional limit C: The stress/strain ratio within the proportional limit D: None of the above

Q48 : Rough surface of elastomeric impression results from_______________?

A: Inadequate mixing B: Air bubbles C: Too rapid polymerization D: Incomplete polymerization caused by premature removal from mouth

Q49 : Maxwell – Voigt Model is to determine________________?

A: Elastic Behaviour B: Plastic Behaviour C: Viscoelastic Behaviour D: All of the above

Q50 : The commonly used laser for curing composite resin is______________?

A: Nd:YAG B: CO2 C: ER:YAG D: Argon

Q51 : The greatest stress which may be produced in a material such that stress is directly proportional to the strain is know as_____________?

A: The elastic limit B: The proportional limit C: The yield strength D: Modulus of elasticity

Q52 : The ability of the base to resist occlusal forces and to support the restoration is affected by_______________?

A: Compressive strength B: Tensile strength C: Young’s modulus D: Modulus of elasticity

Q53 : To prevent porosity in self-cure acrylic resin, curing should be carried in______________?

A: Cold water B: Hot water C: Under tap water D: Under vacuum pressure

Q54 : The rapid decrease in tensile strength and increase in ductility of a wrought metal is seen in which stage of annealing ?

A: Recovery stage B: Recrystallisation stage C: Grain growth stage D: All of the above

Q55 : Which is the use of boxing an impression______________?

A: Ease of construction of denture B: Preserving the sulci C: Ease of pouring an impression D: All of the above

Q56 : K2SO4 in agar-agar is for_______________?

A: Accelerating the setting stage of gypsum B: Increase strength C: Give dimensional stability D: None of the above

Q57 : Retarder in Zinc oxide eugenol is______________?

A: CaCl2 B: Zinc acetate C: Alcohol D: Glycerine

Q58 : Which of the following absorbs maximum amount of water ?

A: Microfilled resin B: Macrofilled resin C: Hybrid D: Light cure activated

Q59 : Residual monomer content of chemically activated resins is______________?

A: 0.2% to 0.5% B: 2% to 5% C: 0.3% to 0.5% D: 2% to 5%

Q60 : 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

Q61 : Strain is defined as_____________?

A: An applied load or force B: A deformation resulting from an applied load C: An external force opposing an applied load D: An internal force opposing an applied load

Q62 : Most ideally elastic among the following_______________?

A: Polyether B: Addition silicone C: Polysulphide D: Condensation silicone

Q63 : 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

Q64 : Impurities in casting is removed by________________?

A: Annealing B: Degassing C: Pickling D: Conditioning

Q65 : Acrylic resins are used for______________?

A: Anterior restorations B: Temporary bridges C: Denture base D: All of the above

Q66 : If resin is packed in sandy stage what will be seen in the processed denture ?

A: Distortion B: Porosity C: Inhomogeneous colour D: Increased strength

Q67 : A crystal in metal substructure is_______________?

A: Grain B: Nucleus C: Stroma D: None of the above

Q68 : The setting time of irreversible hydrocolloids can be decreased by_____________?

A: Raising the temperature of water used for maxing B: Using excess water for maxing C: Lowering the temperature of water used for mixing D: None of the above

Q69 : The best way to remove a hydrocolloid impression from the patient’s mouth is____________?

A: Slight rocking of the impression to disengage it from the undercut B: Wetting the periphery of the impression with moist cotton to break the peripheral seal C: Sudden jerking of the impression to prevent tearing D: Supporting the impression along with the tray to prevent disengaging of the tray alone

Q70 : Addition of large amounts of platinum to a casting gold alloy will________________?

A: Decrease its strength and ability to be hardened B: Decrease its tarnish resistance C: Increase its fusion temperature D: Redden the alloy

Q71 : The forces that hold atoms together are called_____________?

A: Primary forces B: Secondary forces C: Cohesive forces D: Ionic forces

Q72 : Macromolecules in Dental Resin is attached by______________?

A: Covalent bonds B: sonic bonds C: Vander Wall’s Forces D: Hydrogen Bonds

Q73 : Air bubbles formed on the surface of casting is probably due to________________?

A: Improper casting pressure B: Improper heating of the investment C: Improper angulation of sprue D: Improper wetting of the wax pattern by the investment

Q74 : For esthetic areas where high luster is required the restoration used usually______________?

A: . Glass ionomer restoratives B: Hybrid resin composites C: Microfilled resin composites D: Macrofilled resin composites

Q75 : NiTi alloy have_______________?

A: Shape memory B: Hyper rigidity C: Corrosion resistance D: Weldable properties

Q76 : Which is best material for RPD impression_______________?

A: . Impression plaster B: Irreversible hydrocolloid C: Reversible hydroollioid D: None of the above

Q77 : Austenite is an alloy of iron of and carbon with the iron in______________?

A: Alpha form B: Beta form C: Gamma form D: None of the above

Q78 : The wetting of an adherent surface by an adhesive is related to________________?

A: Surface energy of the adherent B: Surface texture of the adherent C: Surface tension of the adherent D: Nature of the adherent that is crystalline or amorphous

Q79 : Inlay wax is used to_______________?

A: Temporarily cement inlays: B: Make inlay wax patterns C: Invest inlay patterns D: Box models

Q80 : What is the polymerization shrinkage if 3:1 powder: liquid ratio is used____________?

A: 6% B: 8% C: 10% D: 21%

Q81 : Gold content of an 18 carat alloy is______________?

A: 25% B: 50% C: 75% D: 100%

Q82 : Insufficient closure of the flasks during packing of denture base resin can result in_____________?

A: Poor colour stability B: Less polymerization shrinkage C: Increase in vertical dimension D: Decrease in vertical dimension

Q83 : During polymerisation of acrylic resin, above what temperature benzoyl peroxide form freeradicals_______________?

A: 25°C B: 37°C C: 50°C D: 60°C

Q84 : Light cure system, side effect is____________?

A: Iritis B: Cataract C: Conjunctivitis D: Retinal damage

Q85 : Hydroquinone is added to methyl methacrylate monomer_________________?

A: To prevent polymerization during storage B: To initiate release of free radicalls C: To enable polymerization reaction at room temperature D: All of the above

Q86 : The % of free monomer in a heat – cured acrylic resin is_______________?

A: 3% to 5% B: 8% to 10% C: 0.2% to 0.5% D: 0.6% to 0.8%

Q87 : One of the claims for the superiority composite resin restoration over silicate cement restorations is that the resin restorations_____________?

A: . Prevent galvanic action B: Are practically insoluble in oral fluids C: Adapt to the walls of the cavity better D: Have a higher coefficient of thermal expansion

Q88 : The advantage of unfilled methyl methacrylate is that______________?

A: It can be finished smoothly B: It has a low degree of flow C: It’s non-irritation to pulp D: It’s wear resistant is high

Q89 : Etching depth after 30 sec for orthodontic bracket with orthophosphoric acid is_________________?

A: 10 um – 20 um B: 3 um – 9 um C: 50 um – 110 um D: 200 um – 250 um

Q90 : The most important disadvantage of acrylic denture base is_______________?

A: porosity B: Shrinkage C: Tooth breakage D: Water absorption

Q91 : The cross linking agent of polysulphide rubber base impression material is______________?

A: Aromatic sulfonate esters B: Stannous octate C: Platinum salt catalyst D: Lead dioxide

Q92 : Porosity of denture base is due to_______________?

A: Packing at dough stage B: Curing at 160°F for 9 hrs C: Inadequate pressure D: All of the above

Q93 : Ideal requirement of metal ceramic casting____________?

A: Low fusing ceramic and high fusing alloys B: Matching of coefficients of thermal expansion of ceramics and alloy C: Bonding between ceramic and alloy D: All of the above

Q94 : Advantage of titanium over other base metal alloys_______________?

A: Low weight B: Low cost C: Low strength D: Low melting point

Q95 : Benzoin methyl ether in a polymer indicates that they may be cured in the presence of________________?

A: UV light B: Visible light C: Infrared light D: Diketone

Q96 : The accepted polymer to monomer ratio for packing of polymethyl methacrylate resin is____________?

A: 3:1 B: 4:1 C: 10:1 D: 5:1

Q97 : The best fuel gas when used with oxygen is______________?

A: Hydrogen B: Natural gas C: Propane D: Propane

Q98 : Modern dental noble metal casting alloys generally have equiaxed fine grain structures because of the incorporation of small amounts of______________?

A: Chromium B: Indium C: Irridium D: Palladium

Q99 : 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: Knoop hardness number D: Rockwell hardness number

Q100 : If resin is packed in sandy stage what will be seen in the processed denture ?

A: Distortion B: Porosity C: Inhomogeneous colour D: Increased strength

Free Dental MCQs Mock Test Online with Answers

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