Free Dental MCQs Mock Test Online with Answers

Q1 : If curing occurs at temperature more than 100°C porosity results in which area of denture______________?

A: Hard thick central area B: Thin Palatal area C: Thin area of flanges D: Porosity is uniformly distributed

Q2 : Stages of annealing in order_________________?

A: Recovery recrystallization grain growth B: Recrystallization recovery, grain growth C: Grain Growth Recrystallization recovery D: Melting point, grain growth, Recrystallization

Q3 : 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

Q4 : In Base metal alloys, Corrosion resistance occurs due to___________________?

A: Passivity B: High Fusion Temperature C: High Molecular Weight D: Co-efficient of Thermal Expansion

Q5 : Asbestos liner is used in a casting ring to________________?

A: Facilitate venting of the mold B: Retard the heating of the investment C: Permit expansion of the world D: All of the above

Q6 : Which of the following fuel gases is the best choice of heat source to carry out soldering process ?

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

Q7 : Which of the following absorbs maximum amount of water ?

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

Q8 : The polymerization of self-curing resin takes faster in______________?

A: Cold water B: Hot water C: Under pressure D: In vaccum

Q9 : Tempering of steel cause________________?

A: Increases its toughness B: Increases hardness C: Increase ductility D: decreases its toughness

Q10 : 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

Q11 : Light cure system, side effect is____________?

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

Q12 : Angles between Adhesive and Adherent is Zero degree, it indicates_______________?

A: Complete wetting of surfaces B: Rough surfaces between Adhesive & Adherent C: Adherent and Adhesive molecules are tangent to each other D: Irregularities present between Adherent surfaces

Q13 : 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

Q14 : Deformation that is recovered upon removal of an externally applied force or pressure is known as_____________?

A: Young’s modulus B: Plastic strain C: Elastic strain D: Flexural strain

Q15 : Suck back porosity is due to_________________?

A: Attached impurities on undersurface of casting B: Hot spot C: No rapid cooling D: Inadequate melting temperature

Q16 : Brazilian test is used to determine the ultimates tensile strength of_________________?

A: Ductile materials B: Flexible materials C: Brittle materials D: Malleable materials

Q17 : Which of the following provide opacity to composite ?

A: TEGDMA B: BIS-GMA C: Ti02 D: None of the above

Q18 : 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

Q19 : 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

Q20 : Who was the first person to introduce cast inlay restoration into dentistry ?

A: William H Taggart B: Buonocore C: G.V. Black D: G.V. Black

Q21 : Corrosion of stainless steel is due to formulation of_________________?

A: Chromium carbide B: Carbon carbide C: Iron carbide D: Nickel carbide

Q22 : The particle size in microfilled composites is_____________?

A: 0.05 to 0.04mm B: 0.5 to 1.0 microns C: 0.01 to 0.1 microns D: Surface porosity

Q23 : Liquids which become more rigid as the rate of deformation increases is termed as_____________?

A: Thixotropic B: Pseudoplastic C: Dilatant D: Newton

Q24 : The function of a sprue is to_______________?

A: Form an opening of molten metal to enter the mold B: Help polish cast restorations C: Eliminate air bubbles on the wax pattern D: Reproduce fine detail

Q25 : 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

Q26 : Fins and spines on the casting is seen due to_______________?

A: Prolonged heating: B: Rapid heating me C: Water film contamination D: Too high pressure during casting

Q27 : Linear coefficient of thermal expansion of metal used for metal caramic restoration range from________________?

A: 11.5-12.5×10-6/°C B: 11.5-12.5×10-6/°C C: 13.5-14.5×10-6/°C D: 16.5-17.5×10-6/°C

Q28 : During polymerisation of acrylic resin, above what temperature benzoyl peroxide form freeradicals_______________?

A: 25°C B: 37°C C: 50°C D: 60°C

Q29 : Agar is prepared from_______________________?

A: Bullock heart B: Chemicals C: Sea weed D: Chick cells

Q30 : 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

Q31 : 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

Q32 : Gold content of an 18 carat alloy is______________?

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

Q33 : Nickel-Titanium alloy has__________________?

A: Unreliable spring back B: low spring back C: Minimal spring back D: None of the above

Q34 : Percentage of gold in high noble alloy is______________?

A: N 25% B: 25% C: >40% D: 0%

Q35 : 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

Q36 : What is the minimum thickness of the elastomeric impression material for an accurate impression_______________?

A: 2 mm B: 2-4 mm C: Greater than 3 mm D: Maximum in the area of operation

Q37 : 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

Q38 : Incomplete casting is the result of_____________?

A: More porous investment in the mould B: Narrow sprue diameter C: Hollow sprue pin D: Large reservoir

Q39 : Linear contraction of elostomeric impression with passage of time is highest in______________?

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

Q40 : Reduction in the fusion temperature of dental gold casting alloys is caused by presence of______________?

A: Platinum B: Copper C: Silver D: Gold

Q41 : 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

Q42 : Which of the following increases castability of base metal alloys________________?

A: Tin B: Beryllium C: Molybdenum D: Carbon

Q43 : Tublulence of molten gold is due to _____________?

A: Impurities in gold B: Improper venting C: A and B D: None of the above

Q44 : Function of carnauba wax_________________?

A: To provide a smooth and glossy surface B: Increase toughness C: Decrease toughness D: Decrease flow at room temperature

Q45 : The type of spatula used to mix composite is________________?

A: Plastic B: Stainless steel C: Iron D: None of the above

Q46 : The process wherein two or more chemically different monomers, each with some desirable property, can be combined to yield specific physical properties of a polymer is known as_____________?

A: Step-growth polymerization B: Addition polymerization C: Condensation polymerization D: Copolymerization

Q47 : Cobalt-Chrominum alloys contains_______________?

A: 30% cobalt and 60% chrominum B: 60% cobalt and 30% chrominum C: 1% palladium D: 20% gold

Q48 : Co-efficient of thermal expansion is highest for_____________?

A: Amalgam B: Silicate cement C: Gold alloy D: Acrylic resin

Q49 : The impression material used to record the prepared areas on abutment teeth is______________?

A: High viscosity elastomeric impression material B: Medium viscosity elastomeric impression material C: Low viscosity elastomeric impression material D: None of the above

Q50 : 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

Q51 : 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

Q52 : The commonly used laser for curing composite resin is______________?

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

Q53 : The porosity formed due to simultaneous nucleation of solid grains and gas bubbles at the first moment that metal freezes at the mold walls is called__________?

A: Pinhole porosity B: Gas inclusion porosity C: Micro porosity D: Subsurface porosity

Q54 : Shape memory in NiTi is because of stress induced form__________________?

A: Austenite to martensite B: Martensite to austenite C: Ferrite to austenite D: Austenite to ferrite

Q55 : When two metals are completely miscible in liquid state and they remain completely mixed on solidifiation, the alloy formed is called________________?

A: Solid solution B: Eutectic mixture C: Peritectic mixture D: Inter metallic compounds

Q56 : Compared with noble metals, base metals show_______________?

A: Increased hardness B: Increased ductility C: Better biocompatibility D: Increased density

Q57 : Most biocompatible material in oral cavity is_______________?

A: Platinium B: Palladium C: Titanium D: Gold

Q58 : 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

Q59 : The inlay wax most commonly used for direct technique_____________________?

A: Type 1 B: Type 2 C: Type 3 D: Type 4

Q60 : 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

Q61 : In processing methyl methacrylate, the resin may show porosity if the flask is placed too soon porosity most likely occur_____________?

A: Throughout the denture B: Near the borders C: In the thickest part D: On the denture surface

Q62 : Cold cure acrylic expand in water by___________?

A: 1% by volume 0.23% by weight B: 10% by volume 0.23% by weight C: 0.1% by volume 0.23% by weight D: None of the above

Q63 : Heat hardening is the process done at_______________?

A: Heating 750°C and slowly cooling to zero degree B: Heating 750°C and slowly cooling to zero degree C: Heating upto 250°C for 15 to 30 min D: Heating at 750°C and then quenching to room temperature

Q64 : 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

Q65 : Which of the following best describes the working time of elastomeric impression material ?

A: After the start of appearing elastic properties of impression material B: Just after the start of appearing elastic properties of impression material C: Just before the start of appearing elastic properties of impression material D: Loss of luster of impression material

Q66 : During setting of alginate impression materials________________?

A: Trisodium phosphate reacts with sodium alginate B: Trisodium phosphate reacts with calcium sulphate C: Colloidal changes to sol D: Material in contact with soft tissues sets last

Q67 : Suck back porosity in the casting can be eliminated by________________?

A: Increasing the mould metal temperature difference B: Increasing the flow of molten metal C: Flaring the point of the sprue attachment D: All of the above

Q68 : The water powder ratio of alginate is______________?

A: 100 ml of water to 60 gms of powder B: 40 ml of water to 40 gms of powder C: 40 ml of water to 15 gms of powder D: 5 ml of water to 40 gms of powder

Q69 : The main advantage of composites over unfilled direct filling resin is their_____________?

A: Higher solubility in saliva B: Lower modulus of elasticity C: Esthetic excellence D: Lower thermal co-efficient of expansion

Q70 : A crystal in metal substructure is_______________?

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

Q71 : 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

Q72 : Palladium is added to polyvinyl siloxane to_____________?

A: Act as a scavenger B: Helps as surfactant C: Acts as plasticizer D: Acts as a catalyst

Q73 : Rough and irregular surface produced on the impression is because of_______________?

A: Air incorporated during mixing B: Improper application of pressure during impression making C: Presence of excessive saliva in impression area D: Due to improper ratio of polymer and monomer

Q74 : The castability of chromium-cobait base metal alloys when compared to gold based noble metal alloys is_______________?

A: More B: Less C: Equal D: Depends on the alloy type

Q75 : Radio opacity to composite resins is rendered by_______________?

A: Silica glass B: Organic matrix C: Barium glass and strontium glasses D: Fluoride particles

Q76 : KHN of enamel is close to______________?

A: Pure gold B: Amalgam C: Prcelain D: Composite

Q77 : A thinner mix of a gypsum bonded investment will_______________?

A: Produce a smoother casting B: Decrease setting expansion C: Increase setting expansion D: Increase thermal expansion

Q78 : Use of dimethyl-P-toluidine is indicated for_______________?

A: Thermal polymerization of acrylic B: Chemical polymerization C: Retarding the polymerization reaction D: To inhibit the action of benzoyl peroxide

Q79 : Along with polymerisation shrinkage, one of the major disadvantages of polymethyl methacrylate as denture base resin are its poor_____________?

A: Biological properties B: Thermal properties C: Mechanical properties D: Mechanical properties

Q80 : Non metal which conducts elactricity______________?

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

Q81 : One bottle system of adhesive resins_____________?

A: 4th generation bonding agents B: Separate etching step not required C: Separate etching step not required D: Contains only primer

Q82 : NiTi alloy have_______________?

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

Q83 : 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

Q84 : 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

Q85 : The main form of iron carbide found in 18-8 steel________________?

A: Martensite B: Ferrite C: Austenite D: Pearlite

Q86 : 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

Q87 : 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

Q88 : A highly polished surface on a metallic dental restoration aids considerably in the prevention of the____________?

A: Dimensional change B: Thermal conductivity C: Warpage D: Tarnish and corrosion

Q89 : Which of the following decrease with strain hardening______________?

A: Surface hardness B: Strength C: Proportion limit D: Corrosion resistance

Q90 : The main advantage of composites over unfilled direct filling resin is their_____________?

A: Higher solubility in saliva B: Lower modulus of elasticity C: Esthetic excellence D: Lower thermal co-efficient of expansion

Q91 : Sublimation is the conversion of a___________________?

A: Solid directly to gas B: Gas to liquid and then to soild C: Gas directly to liquid D: Solid to liquid and then to gas

Q92 : Marginal leakage related to temperature change occurs to the greatest extent with_______________?

A: Amalgam alloy B: Unfilled resin C: Composite resin D: Direct filling gold

Q93 : Compressive stress is computed by dividing the external force by the_______________?

A: Area of the test specimen upon which the weight rests B: Elasticity of the test specimen in strain C: Length of the test specimen beneath the force D: Strain of the test specimen per unit length

Q94 : 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

Q95 : The Knoop Hardness Number of Microfilled composite Restorative material ranges from____________?

A: 50 – 60 KHN B: 25 – 35 KHN C: 15 – 20 KHN D: 40 – 48 KHN

Q96 : Which of the following is an example of a composite material ?

A: A filled resin B: Colloidal silica C: Gold alloy D: Wax

Q97 : 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

Q98 : 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

Q99 : 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

Q100 : Which one of the following increase the strength and reduce viscosity of agar hydrocolloid impression material_____________?

A: Borax B: Water C: Sulfates D: Carbonates

Free Dental MCQs Mock Test Online with Answers

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