Free Dental MCQs Mock Test Online with Answers

Q1 : 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

Q2 : Insufficient acrylic resin monomer

A: Glycol dimetharylate B: Benzoyl peroxide C: N-para toluidine D: Methyl methacrylate

Q3 : Maxwell – Voigt Model is to determine________________?

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

Q4 : Function of carnauba wax_________________?

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

Q5 : Suck back porosity is due to_________________?

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

Q6 : Light cure system, side effect is____________?

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

Q7 : The best pickling solution for gypsum bonded investment is_______________?

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

Q8 : 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

Q9 : 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

Q10 : Investment material used for cobalt-chromium alloys is_____________?

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

Q11 : Localised shrinkage porosity is seen when there________________?

A: Thin sprue B: No reservoir C: Investment heated strongly D: Inadequate air discharge

Q12 : 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

Q13 : All of the following statements about an alginate impression are EXCEPT________________?

A: It should be rapidly displaced from the mouth B: It may exhibit fluid exudates on the surface as a result of imbibition of water C: It will take up water and expand if kept wet D: It will shrink as a result of syneresis

Q14 : A material which is a mixture of two different materials and its properties are_____________?

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

Q15 : Ductility of a material is a measure of it’s_______________?

A: Grain elongation B: Anealing C: Cold working D: Work hardening

Q16 : Titanium casting is done_____________?

A: Under vacuum in argon atmosphere B: Under air pressure in nitrogen atmosphere C: In specially fabricated aluminium vanadium D: Using CAD-CAM technique

Q17 : Wax pattern is ideally invested immediately to decrease the dimensional changes caused by_______________?

A: Decrease flow B: Continuous expansion C: Relaxation of the internal stresses D: Water loss

Q18 : What is the polymerization shrinkage if 3:1 powder: liquid ratio is used____________?

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

Q19 : Which of the following decrease with strain hardening______________?

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

Q20 : 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

Q21 : 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

Q22 : The most common coupling agents are organic silicon compound called_______________?

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

Q23 : Denture acrylics contain cross-linking agents mainly to improve their_____________?

A: Internal color B: Tissue compability C: Surface hardness D: Craze resistance

Q24 : NiTi alloy have_______________?

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

Q25 : 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

Q26 : VLC resins are also called as______________?

A: Microwave-activated resins B: Tertiary amine-activated resins C: . Light activated resins D: Heat activated resins

Q27 : 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%

Q28 : Most ideally elastic among the following_______________?

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

Q29 : 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%

Q30 : 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

Q31 : 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

Q32 : 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

Q33 : 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

Q34 : 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

Q35 : Most ideally elastic among the following_______________?

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

Q36 : 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

Q37 : The chemical used to etch enamel is_______________?

A: Zinc oxide B: Methyl methacrylate C: Phosphoric acid D: Eugenol

Q38 : 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

Q39 : 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

Q40 : When solid gets wet completely contact angle is______________?

A: 90° B: 0° C: 0 – 90° D: >90°

Q41 : Acrylic (cold cure)______________?

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

Q42 : The imperfection seen on the lingual flange of a lower denture caused by rapid heating during a curing cycle is called_____________?

A: Localised Shrinkage porosity B: Gas inclusion porosity C: Micro porosity D: Surface porosity

Q43 : 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

Q44 : 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

Q45 : Bonding of composite resins to tooth structure is by________________?

A: Covalent bond B: Ionic bond C: Mechanical D: Vanderval forces

Q46 : A material which partially transmits light & partially scatters it________________?

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

Q47 : 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

Q48 : Materials which has high compressive strength and low tensile strength is classified with property of________________?

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

Q49 : 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

Q50 : 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

Q51 : 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

Q52 : 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

Q53 : Impurities in casting is removed by________________?

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

Q54 : The plasticizers used in polyether impression material is_______________?

A: polyether polymer B: Colloidal silica C: Glycol ether D: Di-vinyl poly (dimethyl siloxane

Q55 : The main ingredient of inlay wax is__________________?

A: Candellila wax B: Paraffin wax C: Carnauba wax D: Gum dammar

Q56 : 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

Q57 : Incomplete casting is the result of_____________?

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

Q58 : Dentin bonding agents usually contain_____________?

A: Only Hydrophobic component B: Only Hydrophilic component C: Hydrophobic and hydrophilic component D: Lyophillic and lyophobic component

Q59 : 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

Q60 : 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

Q61 : Best impression material to be used for securing impression after crown preparation_______________?

A: Alginate B: Agar C: Elastome D: Zno paste

Q62 : Brinnel hardness number of a dental gold alloy is directly proportional to its______________?

A: Tensile strength B: Elongation C: Modulus of elasticity D: Modulus of resilience

Q63 : Etching of dentin does not include_____________?

A: Removal of smear layer B: Exposure of collagen fibers C: Opening of dentinal tubules D: Increases surface energy

Q64 : 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

Q65 : 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

Q66 : Stainless steel is used mostly in dentistry_________________?

A: To strength amalgam B: In orthodontic wires C: To construct clasps for partial dentures D: To replace internal gold restorations

Q67 : Apart from composites and ceramics, another material that could be copy milled easily and inexpensively is_________________?

A: Molybdenum B: Germanium C: Titanium D: Chromium

Q68 : Agar is prepared from_______________________?

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

Q69 : 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

Q70 : 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

Q71 : Cobalt-Chrominum alloys contains_______________?

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

Q72 : Final product in alginate is________________?

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

Q73 : The main form of iron carbide found in 18-8 steel________________?

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

Q74 : Corrosion of stainless steel is due to formulation of_________________?

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

Q75 : 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:

Q76 : The type of spatula used to mix composite is________________?

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

Q77 : 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

Q78 : 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

Q79 : Subsurface porosity is due to_____________?

A: Thermal changes B: Thickness of the resin C: Lack of temperature D: Packing past the dough stage

Q80 : 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

Q81 : 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%

Q82 : The polymerization of self-curing resin takes faster in______________?

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

Q83 : Radio opacity to composite resins is rendered by_______________?

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

Q84 : A technique of combining reversible and irreversible hydrocolloid that could bond to irreversible hydrocolloid is known as________________?

A: Injecting technique B: Laminate technique C: Immersion technique D: Immersion technique

Q85 : Composite has_______________?

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

Q86 : The forces that hold atoms together are called_____________?

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

Q87 : 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

Q88 : 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

Q89 : 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

Q90 : Advantage of titanium over other base metal alloys_______________?

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

Q91 :

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

Q92 : Nickel is added to wrought gold alloys as______________?

A: Strengtherner B: Hardener C: Whitens the alloy D: Scavenger

Q93 : Silver plated dyes use an electrolytic bath of_______________?

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

Q94 : 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

Q95 : The base constituents of dental waxes come from three main sources except______________?

A: Animal B: Mineral C: Insect D: Vegetable

Q96 : Function of wetting agents used in casting procedure is_________________?

A: To felicitate wetting of ring liner B: To felicitate mixing investment C: To reduce contact angle of liquid with max surface D: For better wax elimination

Q97 : During soldering, the solidus temperature of the filler material should be_____________?

A: Greater than the substrate material B: . Lesser than the substrate material C: Equal to the substrate material D: Temperature not relevant

Q98 : Immediate pouring of impressions is most critical in_____________?

A: Condensation polysillicon B: Addition Polysilicon C: Polyether D: A and B

Q99 : In heat cure denture base acrylic resins the monomer is___________?

A: Methacrylate B: Ethylmethacrylate C: Methyl ethyl methacrylate D: Polymethylmethacrylate

Q100 : The inlay wax most commonly used for direct technique_____________________?

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

Free Dental MCQs Mock Test Online with Answers

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