MCQOPTIONS
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MCQOPTIONS
This section includes 587 Mcqs, each offering curated multiple-choice questions to sharpen your Medical Subjects knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
The basic constituent of reversible hydrocolloid impression material is________________? |
| A. | Agar |
| B. | Alginic acid |
| C. | Gelatin |
| D. | alginate |
| Answer» B. Alginic acid | |
| 252. |
The base paste of the condensation poly sillicone has a low molecular weight dimethyl siloxane with a terminal-group_______________? |
| A. | Marcaptan group |
| B. | Hydroxyl group |
| C. | Silane group |
| D. | Virryl group |
| Answer» C. Silane group | |
| 253. |
The base constituents of dental waxes come from three main sources except______________? |
| A. | Animal |
| B. | Mineral |
| C. | Insect |
| D. | Vegetable |
| Answer» B. Mineral | |
| 254. |
The average life of silicate cement restoration is______________? |
| A. | 2 years |
| B. | 4 years |
| C. | 6 years |
| D. | 8 years |
| Answer» C. 6 years | |
| 255. |
The American dental association (ADA) specification number for non-aqueous elastomeric dental impression material is______________? |
| A. | 19 |
| B. | 20 |
| C. | 21 |
| D. | 26 |
| Answer» B. 20 | |
| 256. |
The advantage of ZOE impression paste_______________? |
| A. | Has dimensional stability |
| B. | Does not adhere to tissues |
| C. | Is easy manipulation |
| D. | Does not require special trays |
| Answer» B. Does not adhere to tissues | |
| 257. |
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 |
| Answer» B. It has a low degree of flow | |
| 258. |
The addition of which of the following can accelerate the setting time of zinc oxide cement_____________? |
| A. | Zinc acetate |
| B. | Barium sulphate |
| C. | Zinc sulphate |
| D. | Barium chloride |
| Answer» B. Barium sulphate | |
| 259. |
The ADA specification No 1 for composition of amalgam alloy recommends______________? |
| A. | 65% silver, 32% tin and 3% copper |
| B. | 49% silver, 32% tin and 19% cooper |
| C. | 65% silver, 29% tin and 5-6% copper |
| D. | None of the above |
| Answer» D. None of the above | |
| 260. |
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 |
| Answer» B. 4:1 | |
| 261. |
Secondary caries is least likely seen with_______________? |
| A. | Silicate cement |
| B. | Zinc phosphate |
| C. | Polycarboxylate |
| D. | GIC |
| Answer» B. Zinc phosphate | |
| 262. |
Rubber base impressions are poured immediately as they_______________? |
| A. | Continue to polymerize |
| B. | Become elastic |
| C. | Show imbibition and syneresis |
| D. | Show gelation |
| Answer» B. Become elastic | |
| 263. |
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 |
| Answer» E. | |
| 264. |
Rough and irregular surface produced on the impression is because of ? |
| A. | Improper application of pressure during impression making |
| B. | Air incorporated during mixing |
| C. | Too rapid polymerization |
| D. | Presence of moisture in impression area |
| Answer» D. Presence of moisture in impression area | |
| 265. |
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 |
| Answer» E. | |
| 266. |
Rinsing of the impression is important to________________? |
| A. | Remove excess impression material |
| B. | Remove saliva |
| C. | Hydrate the impression |
| D. | Accelerate the setting |
| Answer» C. Hydrate the impression | |
| 267. |
Retarder in Zinc oxide eugenol is______________? |
| A. | CaCl2 |
| B. | Zinc acetate |
| C. | Alcohol |
| D. | Glycerine |
| Answer» E. | |
| 268. |
Resistance to corrosion in a cobalt-chrome casting is due to presence of_______________? |
| A. | High quality iron |
| B. | Chrome |
| C. | Cobalt |
| D. | Nickel |
| Answer» C. Cobalt | |
| 269. |
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% |
| Answer» C. 0.3% to 0.5% | |
| 270. |
Reduction in the fusion temperature of dental gold casting alloys is caused by presence of______________? |
| A. | Platinum |
| B. | Copper |
| C. | Silver |
| D. | Gold |
| Answer» C. Silver | |
| 271. |
Rapid removal of rubber impression with a single firm motion results in____________________? |
| A. | Reduced dimensional instability |
| B. | Improved adhesion of the impression to the tray |
| C. | Minimal permanent deformation |
| D. | Reduced contamination by saliva |
| Answer» D. Reduced contamination by saliva | |
| 272. |
Radio opacity to composite resins is rendered by_______________? |
| A. | Silica glass |
| B. | Organic matrix |
| C. | Barium glass and strontium glasses |
| D. | Fluoride particles |
| Answer» D. Fluoride particles | |
| 273. |
Quartz tungsten light cure device minimum output of energy should not be less than_____________? |
| A. | 300 mw/sm2 |
| B. | 350 mw/cm2 |
| C. | 400 mw/cm2 |
| D. | 450 mw/cm2 |
| Answer» B. 350 mw/cm2 | |
| 274. |
Quartz is Dental porcelain is______________? |
| A. | Strengthener |
| B. | Binder |
| C. | Pigment |
| D. | Crack minimzer |
| Answer» B. Binder | |
| 275. |
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 |
| Answer» C. aid in hygroscopic expansion | |
| 276. |
Quartz in investment material is added for_______________? |
| A. | Strength |
| B. | Expansion components for casting shrinkage |
| C. | Decrease strength |
| D. | Contraction |
| Answer» C. Decrease strength | |
| 277. |
Pyroplastic flow of porcelain is due to___________________? |
| A. | High temperature during glazing |
| B. | Low temperature during glazing |
| C. | Improper condensation |
| D. | High firing temperature |
| Answer» B. Low temperature during glazing | |
| 278. |
Putty wash technique_________________? |
| A. | Light body and putty used at the same time |
| B. | Putty used first and light body used second |
| C. | Light body first and putty later |
| D. | None of the above |
| Answer» C. Light body first and putty later | |
| 279. |
Property of the material, which describes the resistance to abrasion, is_________________? |
| A. | Hardness |
| B. | Yield strength |
| C. | Modulus of elasticity |
| D. | None of the above |
| Answer» B. Yield strength | |
| 280. |
Powders of dental plaster and dental stone differ mainly in____________? |
| A. | Solubility |
| B. | Shelf life |
| C. | Chemical formula |
| D. | Particle porosity |
| Answer» E. | |
| 281. |
Powdered gold is___________________? |
| A. | Made by a combination of chemical precipitation and atomization |
| B. | Made by electrolytic precipitation |
| C. | Made by beating pure gold at high temperatures |
| D. | Made by milling pure gold ingots |
| Answer» B. Made by electrolytic precipitation | |
| 282. |
Porosity present in a acrylic denture is usually the result of______________? |
| A. | A prolonged curing cycle |
| B. | Lack of sufficient pressure applied to flask |
| C. | Insufficient acrylic resin monomer |
| D. | Prolonged bench cooling after curing |
| Answer» C. Insufficient acrylic resin monomer | |
| 283. |
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 |
| Answer» E. | |
| 284. |
Porosity in porcelain can be prevented by_______________? |
| A. | Thoroughness of condensation |
| B. | Rapidity of firing |
| C. | High firing temperature |
| D. | All of the above |
| Answer» B. Rapidity of firing | |
| 285. |
Porosity in porcelain at condensation stage depends on_________________? |
| A. | Shape and size of particle |
| B. | Uniform distribution of particle size |
| C. | Number of particles |
| D. | None of the above |
| Answer» B. Uniform distribution of particle size | |
| 286. |
Porcelain denture teeth________________? |
| A. | Have a higher coefficient of thermal expansion than acrylic teeth: |
| B. | Have a lower abrasion resistance than enamel |
| C. | Should be used where the inter dental clearance is small |
| D. | Have a higher abrasion resistance than gold |
| Answer» E. | |
| 287. |
Porcelain is best fired__________________? |
| A. | In open air |
| B. | Under air compression |
| C. | When several layer are fired simultaneously |
| D. | Under minimum pressure |
| Answer» C. When several layer are fired simultaneously | |
| 288. |
Porcelain binds to metal in PFM crown by_________________? |
| A. | Metallic bind |
| B. | Transparency |
| C. | Chemical bond |
| D. | B and C |
| Answer» E. | |
| 289. |
Polysulfide material is routinely not recommended because of_______________? |
| A. | Unpleasant odor and taste |
| B. | Low accuracy |
| C. | Least permanent deformation |
| D. | Highest curing shrinkage |
| Answer» B. Low accuracy | |
| 290. |
Polymerisation of heat-cured methyl methacrylate is initiated by______________? |
| A. | Tertiary amine |
| B. | Benzoyl peroxide free radical |
| C. | Hydroquinone |
| D. | Methyl ether |
| Answer» C. Hydroquinone | |
| 291. |
Polycarboxylate cement is used for_____________? |
| A. | Temporary restoration |
| B. | Leuting |
| C. | Permanent restoration |
| D. | Die material |
| Answer» C. Permanent restoration | |
| 292. |
Plaster of paris _____________? |
| A. | Is wet calcined hemihydrate |
| B. | Has porous and irregular crystals |
| C. | Is a – hamihydrate |
| D. | Has a W / P of 0.2 |
| Answer» C. Is a – hamihydrate | |
| 293. |
Plaster mix____________? |
| A. | Rapid spatulation results in decreased setting time |
| B. | 2% potassium sulphate is accelerator |
| C. | Citrates are retarders |
| D. | All of the above |
| Answer» E. | |
| 294. |
Plaster of paris is mixed in________________? |
| A. | Plastic bowl |
| B. | Rubber bowl |
| C. | Glass bowl |
| D. | Metal bowl |
| Answer» C. Glass bowl | |
| 295. |
Placing cast under tap water is to be avoided as______________? |
| A. | H2O interferes with hygroscopic expansion |
| B. | H2O inhibits polymerization of dental resin |
| C. | H2O interferes with Crystallization of dihydrate |
| D. | Gypsum is slightly soluble in water and the surface of the cast will be eroded |
| Answer» E. | |
| 296. |
Pitting of direct filling old restoration usually results from_________________? |
| A. | Using contaminated gold foil |
| B. | Poor finished preparation |
| C. | Improper stepping of condenser point |
| D. | Using small condenser point |
| Answer» D. Using small condenser point | |
| 297. |
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 |
| Answer» D. Remove investment from gold casting | |
| 298. |
Phenomenon in which porcelain appears different under varying light condition is______________? |
| A. | Translucency |
| B. | Refractive optics |
| C. | Metamerism |
| D. | Opacification |
| Answer» D. Opacification | |
| 299. |
PH of which cement remain below 7 even after 1 month after insertion into the cavity ? |
| A. | Glass Ionomer Cement |
| B. | Zinc Phosphate |
| C. | Resin cement |
| D. | Silicate cement |
| Answer» E. | |
| 300. |
PH of polycarboxylate liquid is____________? |
| A. | 5 |
| B. | 7 |
| C. | 8 |
| D. | 1.7 |
| Answer» E. | |