Free Dental MCQs Mock Test Online with Answers

Q1 :

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

Q2 : During polymerisation of acrylic resin, above what temperature benzoyl peroxide form freeradicals_______________?

A: 25°C B: 37°C C: 50°C D: 60°C

Q3 : 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

Q4 : The polymerization of self-curing resin takes faster in______________?

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

Q5 : The latest method of curing denture base resins______________?

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

Q6 : Gold content of an 18 carat alloy is______________?

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

Q7 : 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

Q8 : 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

Q9 : 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

Q10 : 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

Q11 : 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

Q12 : Composite resins in comparison to acrylic have_______________?

A: Low compressive strength B: High abrasive resistance C: High water absorption D: High polymerization shrinkage

Q13 : Wash or corrective impression is done by______________?

A: Impression plaster B: Impression paste C: Alginate D: Rubber base impression material

Q14 : Which of the following hardness test is a micro hardness test ?

A: Brinnel B: Knoop C: Shore-A D: Rockwell

Q15 : 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

Q16 : 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

Q17 : VLC resins are also called as______________?

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

Q18 : 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

Q19 : Which of the following is not affected by saliva ?

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

Q20 : 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

Q21 : Dendrites in cst alloys form by mechanism of_________________?

A: Constitutional superconductivity B: Constitutional supercooling C: Constitutional supergriting D: Constitutional supergraining

Q22 : The purity of gold is expressed in________________?

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

Q23 : In self-cure acrylic resin, activator is_____________?

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

Q24 : 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%

Q25 : Casting shrinkage is compensated by_______________?

A: Thermal expansion B: Hygroscopic expansion C: Wax expansion D: All of the above

Q26 : Macromolecules in Dental Resin is attached by______________?

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

Q27 : Acrylic resins were first introduced as a denture base material in______________?

A: 1925 B: 1937 C: 1951 D: 1956

Q28 : Percentage of gold in high noble alloy is______________?

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

Q29 : 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

Q30 : 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

Q31 : The proportional limit is defined as______________?

A: The maximum stress in a structure B: The minimum force required to cause a structure to break C: The maximum stress that can be induced without permanent deformation D: The maximum elongation under tension that can be measured before failure

Q32 : The term given to the phenomenon of moisture absorption by an alginate impression in________________?

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

Q33 : Gases dissolved in molten metals are liberated when cooled giving rise to________________?

A: Suckback porosity B: Gas inclusion porosity C: . Localized shrinkage porosity D: Microporosity

Q34 : 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

Q35 : 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

Q36 : Suck back porosity is due to_________________?

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

Q37 : Stabilization of stainless steel is achieved by adding____________?

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

Q38 : The melting point of silver is_____________?

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

Q39 : 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

Q40 : 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

Q41 : Dentin bonding agents usually contain_____________?

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

Q42 : Acid-etching is done for_______________?

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

Q43 : Waxes are used for_______________?

A: Primary impression B: Corrective impressions C: Impression of single tooth D: None of the above

Q44 : Cobalt-Chrominum alloys contains_______________?

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

Q45 : 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

Q46 : A fluid having constant viscosity that does not depend upon the strain rate is said to be_______________?

A: Viscoelastic B: Pseudoplastic C: Plastic D: Newtonian

Q47 : 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

Q48 : The most important disadvantage of acrylic denture base is_______________?

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

Q49 : Most biocompatible material in oral cavity is_______________?

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

Q50 : Investment material used for cobalt-chromium alloys is_____________?

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

Q51 : Which material undergoes hysteresis ?

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

Q52 : 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

Q53 : 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

Q54 : 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

Q55 : 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

Q56 : 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

Q57 : Which of the following provide opacity to composite ?

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

Q58 : 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

Q59 : 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

Q60 : Which of the following constituents is common in occlusal sealants, bonding agents, composite resins ?

A: BIS GMA B: Polymethyl methacrylate C: Benzoin methyl ether D: Silica filter

Q61 : 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

Q62 : 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

Q63 : 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

Q64 : 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

Q65 : 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

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 : Flux is used during casting to________________?

A: Remove the oxides formed on the gold alloy B: Lower the melting point C: Replace casting wax D: Speed the burnout process

Q68 : The term ordered hardening heat treatment used in which of the following dental alloys ?

A: Gold-Copper B: Nickel-Chromium C: Nickel-Titanium D: Silver-Palladium

Q69 : 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

Q70 : 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

Q71 : Ductility of a material is a measure of it’s_______________?

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

Q72 : Maxwell – Voigt Model is to determine________________?

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

Q73 : Reduction in the fusion temperature of dental gold casting alloys is caused by presence of______________?

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

Q74 : The strain that occurs when a material is stressed to its proportional limit is______________?

A: Resilience B: Maximum flexibility C: Toughness D: Elastic limit

Q75 : Binder used in Gypsum investment is_________________?

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

Q76 : Subsurface porosity is due to_____________?

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

Q77 : The contraction of gold alloy on solidifying is approximately_____________?

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

Q78 : 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

Q79 : Palatal secretions affect the setting of all the impression materials except_______________?

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

Q80 : Which of the following absorbs maximum amount of water ?

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

Q81 : Acrylic (cold cure)______________?

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

Q82 : Quartz is added to gypsum bonded investment to______________?

A: Increase the strength B: Counter balance contraction of gypsum during heating C: aid in hygroscopic expansion D: Increase the shelf life of investment

Q83 : Bonding of composite resins to tooth structure is by________________?

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

Q84 : A material which is a mixture of two different materials and its properties are_____________?

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

Q85 : Radio opacity to composite resins is rendered by_______________?

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

Q86 : Corrosion of stainless steel is due to formulation of_________________?

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

Q87 : A common electrolyte used for plating copper indirect dies is_______________?

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

Q88 : Solder and flux used for joining Elgiloy wires are_____________?

A: Gold solder and borax flux B: Gold solder and fluoride flux C: Silver Solder and borax flux D: Silver solder and fluoride flux

Q89 : Pickling________________?

A: Is accomplished by soaking the casting in baking soda B: Causes porosity in gold C: Removes surface oxides from gold castings D: Remove investment from gold casting

Q90 : 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

Q91 : The main form of iron carbide found in 18-8 steel________________?

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

Q92 : Which one of the following is used as filler in composite resins ?

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

Q93 : 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%

Q94 : Component of inlay wax which makes it flake resistant is_____________?

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

Q95 : Function of carnauba wax_________________?

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

Q96 : Polymerisation of heat-cured methyl methacrylate is initiated by______________?

A: Tertiary amine B: Benzoyl peroxide free radical C: Hydroquinone D: Methyl ether

Q97 : 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

Q98 : 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

Q99 : When restoring a tooth with resin material, acid etching can do all of the following except______________?

A: Increase the surface area B: Permit chemical bonding between resin and enamel C: Create surface irregularities in enamel for better mechanical retention of resin D: Condition the tooth surface for better wetting

Q100 : 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

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