Free Dental MCQs Mock Test Online with Answers

Q1 : The melting point of silver is_____________?

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

Q2 : Casting flux is used to_______________?

A: Prevent the oxidation of the metal during melting B: increase the melting point of the flux C: Flaring the point of the sprue attachment D: None of the above

Q3 : NiTi alloy have_______________?

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

Q4 : 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

Q5 : Alginate impression material is________________?

A: Non-elastic impression material B: Thermoplastic impression material C: More mucostatic than ZOE D: Less mucostatic than ZOE

Q6 : KHN of enamel is close to______________?

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

Q7 : The contraction of gold alloy on solidifying is approximately_____________?

A: 0.4% B: 1.4% C: 2.4% D: 3.4%

Q8 : Maxwell – Voigt Model is to determine________________?

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

Q9 : Which one of the following is used as filler in composite resins ?

A: Quartz B: Silicates C: Zinc particles D: Aluminium

Q10 : The purity of gold is expressed in________________?

A: Carats B: Percentage C: Fineness D: Gram

Q11 : 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

Q12 : 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

Q13 : Passivating alloys are_______________?

A: Cr, Al, Ti B: Cr, Mo, Ti C: Cr, Gold, Ti D: Cr, Fe, Ti

Q14 : 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

Q15 : Binder in phosphate bonded investment is______________?

A: Magnesium oxide & Phosphate B: Magnesium oxide & Phosphoric acid C: Magnesium oxide & Monoammonium phosphate D: Magnesium oxide & Ortho Phosphoric acid

Q16 : No trail closure is necessary with which one of the technique during denture fabrication_____________?

A: Compression moulding technique B: Injection moulding technique C: Fluid resin technique D: Light cured technique

Q17 : 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

Q18 : 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

Q19 : The restoration which shows percolation and shrinkage along the margins is_____________?

A: Composites B: Unfilled resins C: Amalgam D: Polycarboxylate

Q20 : A crystal in metal substructure is_______________?

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

Q21 : Investment material used for cobalt-chromium alloys is_____________?

A: Gypsum bonded B: Phosphate bonded C: Silica bonded D: None of the above

Q22 : 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

Q23 : Which of the following is an example of a composite material ?

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

Q24 : Which of the waxes are derived from the lignite_________________?

A: Paraffin wax B: Inlay wax C: Microcrystalline wax D: Montan wax

Q25 : 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

Q26 : 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

Q27 : Glossy smooth margins of a casting are due to_____________?

A: Shrinkage of alloy on cooling B: Investment breakdown C: Incomplete wax elimination D: Incomplete gas elimination

Q28 : 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

Q29 : Agar impression materials differ from alginate impression materials in that the former sets by_______________?

A: Mechanical action of saliva B: Physical change C: Evolution D: Chemical change

Q30 : Hydrocolloid material, show all except______________?

A: Hysterisis B: Imbibition C: Recrytallisation D: Syneresis

Q31 : Which of the following decrease with strain hardening______________?

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

Q32 : Ability of an orthodontic wire to spring back to its original shape is evaluated by_____________?

A: Brittleness B: Resilience C: Tensile strength D: Toughness

Q33 : 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

Q34 : 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

Q35 : Light cure system, side effect is____________?

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

Q36 : Most ideally elastic among the following_______________?

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

Q37 : Mechanical properties of Cp Titanium are similar to alloys_____________?

A: Type III and Type IV gold B: Type V and type VI gold C: Type VII and type VIII gold D: None of the above

Q38 : 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

Q39 : The function of the coupling agent in a restorative resin is to allow______________?

A: Adhesion of resin particles B: Bonding between filler crystals C: Bonding between filler and resin D: Bonding between tooth and resin

Q40 : A material which partially transmits light & partially scatters it________________?

A: Reflector B: Translucent C: Transparent D: Opaque

Q41 : Materials which has high compressive strength and low tensile strength is classified with property of________________?

A: Ductility B: Brittleness C: Malleability D: Resilient

Q42 : In self-cure acrylic resin, activator is_____________?

A: Toluidine B: Quaternary ammonium compound C: Benzoyl peroxide D: Tertiary amine

Q43 : 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

Q44 : The main form of iron carbide found in 18-8 steel________________?

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

Q45 : 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

Q46 : 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

Q47 : 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

Q48 : 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

Q49 : 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

Q50 : Resistance to corrosion in a cobalt-chrome casting is due to presence of_______________?

A: High quality iron B: Chrome C: Cobalt D: Nickel

Q51 : Stainless steel orthodontic wire can be hardened by________________?

A: Tempering B: Work hardening C: Age hardening D: Precipitation hardening

Q52 : Etchant preferred in gel from than in liquid form________________?

A: Better control over placement B: Enhance and concentrate the action of acid C: Helps in visualization while placement D: None of the above

Q53 : The type of spatula used to mix composite is________________?

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

Q54 : 4th state of matter is______________?

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

Q55 : The solvent flux used for base metal soldering is_______________?

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

Q56 : Final product in alginate is________________?

A: Sodium alginate B: Potassium alginate C: Potassium alginate D: Potassium alginate

Q57 : 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

Q58 : 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

Q59 : Hardness number which does not depend on the ductility of metal_____________?

A: KNH B: VHN C: RHN D: BHN

Q60 : 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

Q61 : 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

Q62 : 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

Q63 : Which of the following fuel gases used for soldering, has the highest heat content______________?

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

Q64 : 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

Q65 : The latest method of curing denture base resins______________?

A: Heat B: Visible light C: Chemicals D: Lasers

Q66 : All of the following statements about the differences between self-polymerizing acrylic resins and heat-cured resins are true EXCEPT______________?

A: The former have a lower molecular weight B: The former have higher residual monomer content C: The former are more porous D: The former have greater transverse strength

Q67 : Suck back porosity is due to_________________?

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

Q68 : 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

Q69 : 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

Q70 : The sprue in wax pattern should be placed________________?

A: At right angle B: At 45°C angle C: . At obtuse angle D: It depend upon type of wax pattern

Q71 : A material which is a mixture of two different materials and its properties are_____________?

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

Q72 : The gold alloys used for casting contain at least…. percent of precious metal according to ADA specification number 5________________?

A: 55 B: 65 C: 75 D: 85

Q73 : Inorganic phase of the composites aid in_______________?

A: Increasing the mechanical strength B: Decreasing the coefficient of thermal expansion C: Reducing the polymerization shrinkage D: All of the above

Q74 : Radio opacity to composite resins is rendered by_______________?

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

Q75 : Acrylic (cold cure)______________?

A: Melts at 100°C B: Softens at 100°C C: Still requires heat for polymerization D: Produces heat during polymerization

Q76 : Composite has_______________?

A: Resin B: Filler C: Resin & Filler D: None

Q77 : Which of the following cast gold alloys is used for fabricating partial denture frameworks______________?

A: Type I – Soft B: Type II – Hard C: Type III – Hard D: Type IV – Extra Hard

Q78 : The pattern for the metallic framework of a removable partial denture is fabricated from________________?

A: Inlay wax type-II B: Boxing wax C: Modelling wax D: Casting wax

Q79 :

A: The stiffness of a dental gold alloy is determined by its________________? B: Proportional limit C: Modulus of elasticity D: Flow

Q80 : 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

Q81 : 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

Q82 : Inlay wax is used to_______________?

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

Q83 : Which one of the following is used as filler in composite resins ?

A: Quartz B: Silicates C: Zinc particles D: Aluminium

Q84 : Syringe material is______________?

A: High viscosity elastomer B: Medium viscosity elastomer C: Medium & low viscosity elastomer D: Low viscosity elastomer

Q85 : 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

Q86 : The yield strength of AUstenite (NiTi alloy) is______________?

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

Q87 : 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

Q88 : Which of the following provide opacity to composite ?

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

Q89 : 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

Q90 : 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

Q91 : Which material undergoes hysteresis ?

A: Irreversible hydrocolloid B: Reversible hydrocolloid C: Impression plaster D: Metallic oxide paste

Q92 : Modulus of elasticity means_______________?

A: Rigidity or stiffness of the material B: Ability to be stretched with permanent deformation C: Ductility of a material D: Malleability of the metal

Q93 : The linear solidification shrinkage of Type IV Ni-Cr based alloys is_______________?

A: 2.3% B: 1.56% C: 1.37% D: 3%

Q94 : Retarder in Zinc oxide eugenol is______________?

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

Q95 : 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

Q96 : The most important disadvantage of acrylic denture base is_______________?

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

Q97 : 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

Q98 : 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

Q99 : The best pickling solution for gypsum bonded investment is_______________?

A: Hydrochloric acid B: Nitric acid C: Sulphuric acid D: Phosphoric acid

Q100 : Binder used in Gypsum investment is_________________?

A: Silica B: Quartz C: Cristobolite D: Calcium sulphate monohydrate

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