When dry cast is immersed in water saturated with calcium sulphate:**
A. There is contraction
B. There is negligible expansion
C. There is definite expansion
D. There is no change
E. None of the above

1 Answer

Answer :

B. There is negligible expansion

Related questions

Description : A partial denture that seats on the master cast but fails to seat correctly in the mouth is a result of, A. Contraction of the metal framework during casting B. Insufficient expansion of the investment material C. Distortion of impression D. Failure to block out unwanted undercuts

Last Answer : C. Distortion of impression

Description : At the liquid limit a) The soil just begins to crumble when rolled into a thread b) The shearing strength against flowing is negligible c) The shearing strength against flowing is a small but definite* d) The soil will not get fully saturated

Last Answer : c) The shearing strength against flowing is a small but definite

Description : Why would you invest the wax pattern as soon as possible in an indirect inlay fabrication: A. Minimise distortion B. Avoid contraction C. Avoid expansion

Last Answer : A. Minimise distortion

Description : The MOST effective manner to produce a hard surface on a cast is by: A. Employ as much water as possible on mixing B. Employ as little water as possible on mixing C. Adding 2% of borax to the mix D. Adding calcium tetraborate E. None of the above

Last Answer : B. Employ as little water as possible on mixing

Description : An aluminium strip is kept immersed in a freshly prepared ferrous sulphate solution taken in a test tube, the change observed is that a) Green solution slowly turns brown b) Lower end of the test ... c)A colourless gas with smell of burning sulphur is evolved c)Light green solution changes to blue

Last Answer : a) Green solution slowly turns brown

Description : Distortion or change in shape of a cast partial denture clasp during its clinical use probably indicates that the: A. Ductility was too low B. Hardness was too great C. Ultimate tensile strength was too low D. Tension temperature was too high E. Elastic limit was exceeded

Last Answer : E. Elastic limit was exceeded

Description : The condition of refrigerant before entering the expansion or throttle valve, in a vapour compression system (a) dry vapour (b) wet vapour (c)liquid-vapour mixture (d) high pressure saturated liquid

Last Answer : Ans: d

Description : In vapour compression cycle the condition off refrigerant is dry saturated vapour (a) after passing through the condenser (b) before passing through the condenser (c)before entering the expansion valve (d) before entering the compressor

Last Answer : Ans: D

Description : [53] The iron loss of the transformer is negligible during short circuit test because A. The entire input is just sufficient to meet Cu losses only B. Flux produced is a small fraction of the normal flux C. Iron core becomes fully saturated D. Supply frequency is held constant

Last Answer : B. Flux produced is a small fraction of the normal flux

Description : Jaw relation of an edentulous patient has been established. The maxillary cast has been mounted on an articulator without a face bow. You decide to increase the occlusal vertical dimension by 4mm this ... C. A change in the condylar guide settings D. An increase in the rest vertical dimension

Last Answer : B. A new centric relation to be recorded

Description : Which of the following DOES NOT cause depression of the mandible: A. Contraction of lateral pterygoid B. Contraction of temporalis C. Contraction of the suprahyoid muscles D. Contraction of the ... E. Relaxation of all muscles so that the only forces on the mandible are the forces of

Last Answer : B. Contraction of temporalis

Description : .Oil or water on impression for treatment casts causes: A. An increase of the quality B. No alteration C. A decrease of the quality D. Bubbles on the cast

Last Answer : C. A decrease of the quality

Description : A patient with a history of angina suffers an attack while in the dental chair. Prompt relief can be anticipated in MOST instances from: A. Oral administration of short acting ... epinephrine D. Sublingual administration of glyceryl tri-nitrate E. Putting the patient in upright position

Last Answer : D. Sublingual administration of glyceryl tri-nitrate

Description : The contraction (Gaseous) porosity in inlays is related to:** A. Overheating of the alloy B. Molten gases C. Diameter of the sprue D. Overheating of investment

Last Answer : B. Molten gases

Description : Porosity in acrylic dentures is caused by,  A. Contraction porosity in thickest point of the denture  B. Insufficient pressure during flasking 

Last Answer : A. Contraction porosity in thickest point of the denture  B. Insufficient pressure during flasking 

Description : The contraction of gold alloys on solidifying is approximately: A. 0.5% B. 2.5% C. 1.40% D. 3%

Last Answer : C. 1.40%

Description : A 7 years-old child has class I malocclusion, slight version of maxillary class III, adequate arch length. What is your management: A. Oral screen B. Head cap therapy C. Inclined plane on mandibular anterior teeth D. Hawley plate E. Expansion screw plate

Last Answer : C. Inclined plane on mandibular anterior teeth

Description : A female patient is diagnosed with Addison’s disease. Which of the following does not confirm this: A. Weakness, lassitude B. Anorexia, nauseas, fatigue C. Hypotension D. Bony expansion E. Amenorrhea

Last Answer : D. Bony expansion

Description : High copper amalgam lasts longer than low copper amalgam because of:**  A. Increased compressive strength  B. Increased corrosion resistance  C. High creep  D. Increased tensile strength  E. Decreased setting expansion 

Last Answer : A. Increased compressive strength 

Description : How can a periodontal pocket be recognised:** A. X-Ray B. Periodontal probe / Calibrated probe C. Periodontal marker D. Bitewing radiograph E. Sharp explorer F. Study cast

Last Answer : B. Periodontal probe / Calibrated probe

Description : Which of the following areas CANNOT be determined by survey analysis of partially edentulous cast? A. Areas to be revealed as blocked out to properly located rigid parts of a frame work B. Areas to be ... planes D. Areas used for retention E. Areas used for support F. Depth of rest seats

Last Answer : F. Depth of rest seats

Description : A solid metallic block weighing 5 kg has an initial temperature of 500°C. 40 kg of water initially at 25°C is contained in a perfectly insulated tank. The metallic block is brought into contact with water. Both of them come to equilibrium. ... .kg-1, K-1is (A) -1.87 (B) 0 (C) 1.26 (D) 3.91

Last Answer : (B) 0

Description : Which of the following is an expansile lesion of the oral mucosa, A. Keratocyte more expansion B. Radicular cyst C. Cementoma

Last Answer : B. Radicular cyst

Description : What is your management of a single retroclined upper incisor in a 9 years-old child with sufficient space: A. Anterior inclined plane on mandibular teeth B. Biteplane and protrusion screw C. Expansion screw D. Hawley appliance

Last Answer : A. Anterior inclined plane on mandibular teeth

Description : The most common cause of fracture at the isthmus of class II dental amalgam restoration is: A. Delayed expansion B. Inadequate depth at the isthmus area C. Inadequate width at the isthmus area

Last Answer : B. Inadequate depth at the isthmus area

Description : What is an important requisite for fillers in dental composite restorative resins in load bearing areas: A. Sub micro sized particles B. High coefficient of thermal expansion C. High in content (High filler)

Last Answer : C. High in content (High filler)

Description : .In regard to the glass of quartz particles of filling restorative resin; the microfill resins tend to have, A. A higher coefficient of thermal expansion and a higher crashing strength B. ... and a higher crashing strength D. A lower coefficient of thermal expansion and a lower crashing strength

Last Answer : B. A higher coefficient of thermal expansion and a lower crashing strength

Description : The setting expansion of casting investment is approximately A. 0 to 0.1% B. 0.1 to 0.5% C. 0.5 to 1% D. 1.1 to 1.6%

Last Answer : B. 0.1 to 0.5%

Description : Jaw relations for edentulous patient have been established. The maxillary cast has been mounted on the articulator without face-bow and you decide to increase the occlusal vertical dimension by 4 mm ... record C. Changes in the condylar guide settings D. Increase in the vertical dimension

Last Answer : B. A new centric relation record

Description : In the construction of partial dentures the surveyor is not used to, A. Contour the wax as part of the fabrication of the working cast B. Locate the guide planes C. Determine the location of indirect retainers D. Identify any undesirable undercuts

Last Answer : A. Contour the wax as part of the fabrication of the working cast

Description : Which one of this restorative methods will be LEAST compromised by a core, A. Amalgam B. Composite C. GIC D. Cast gold

Last Answer : D. Cast gold

Description : A cast crown fits on the die but not on the tooth, the discrepancy is about 0.3mm, what would you do: A. Relieve cast from the inside B. Take a new impression and make new crown C. Burnish margins D. Use thick mix of cement

Last Answer : B. Take a new impression and make new crown

Description : Why are three tripods marked on a cast being surveyed: A. To orient cast to articulator B. To orient cast to surveyor C. To provide guide planes

Last Answer : B. To orient cast to surveyor

Description : You can increase the retention of a Maryland bridge by: A. Incorporating mesh work in wax pattern B. Perforation techniques in the metal cast

Last Answer : A. Incorporating mesh work in wax pattern

Description : A gingivally extended chrome cobalt cast clasp: A. Can extend 0.5 under the surveyor line B. Can extend 0.25 under the surveyor line C. Will resist deforming forces better compared to cast gold

Last Answer : B. Can extend 0.25 under the surveyor line

Description : When surveying: A. Tilt the cast

Last Answer : A. Tilt the cast

Description : In planning and construction of a cast metal partial denture the study cast, M07 A. facilitate the construction of custom/special trays B. minimize the need for articulating C. provide only ... best assessed clinically D. can be used as a working cast when duplicating facilities are not available

Last Answer : A. facilitate the construction of custom/special trays

Description : A 10 years-old boy presents with a non-vital, non-mobile tooth. Treatment is: A. Pulpectomy with calcium hydroxide B. Pulpectomy with Zinc oxide eugenol C. Pulpotomy with formocresol D. No treatment is required if tooth is asymptomatic

Last Answer : A. Pulpectomy with calcium hydroxide

Description : Explain why calcium metal after reacting with water starts floating on its * surface. Write the chemical equation for the reaction. Name one more metal that starts floating after some time when immersed in water. -Chemistry

Last Answer : Calcium starts floating because the bubbles of hydrogen gas formed stick to the surface of metal. Magnesium reacts with hot water and starts floating due to the bubbles of hydrogen gas sticking to its surface.

Description : An 8 years-old child who has sustained a fracture of maxillary permanent central incisor in which 2mm of the pulp is exposed presents for treatment three hours after injury. Which of the ... - Pulpotomy using formocresol. d- Pulpectomy and immediate root filling. e- Pulpectomy and apexification.

Last Answer : a- Remove the surface 1. 2 mm of pulp tissue and place calcium hydroxide

Description : Child comes to your clinic with a fractured incisor 3 mm supra-gingival, how would you treat the case, A. Formocretasol pulpotomy B. Calcium hydroxide pulpotomy C. Pulpectomy D. Direct capping E. Indirect capping

Last Answer : B. Calcium hydroxide pulpotomy

Description : A child consumes a toxic dose of fluoride. You will:** A. Induce vomiting B. Give a lot of fluids C. Give a lot of fluids and sodium bicarbonates D. Ask patient not to eat for 45 minutes E. Give milk, calcium tablets or magnesium tablets

Last Answer : E. Give milk, calcium tablets or magnesium tablets

Description : 8 years old child who has sustained a fracture of maxillary permanent central incisor in which 2mm of the pulp is exposed; presents for treatment three hours after injury. Which of the ... C. Pulpotomy using formocresol D. Pulpectomy and immediate root filling E. Pulpectomy and apexification

Last Answer : A. Remove the surface 1-2 mm of pulp tissue and place calcium hydroxide (Cvek pulpotomy, apexogenesis)

Description : In a railway track, two rails are joined end to end with a gap tin between them because? A. Steel can be saved B. Accidents due to contraction in winter can be avoided C. Air gaps are necessary ... of running train D. Accidents due to expansion in summer can be avoided (Answer) E. All of these

Last Answer : D. Accidents due to expansion in summer can be avoided (Answer)

Description : Concrete tank can be used to store (A) Alum (B) Ferrous sulphate (C) Sulphuric acid (D) Saturated brine

Last Answer : (D) Saturated brine

Description : Which of the following procedures will not achieve sterilization: A. Hot air at 160ºC for 90mins B. Boiling water at 100ºC for 2 hours C. Autoclave at 121ºC under 15psi for 20 mins D. Dry heat at 177ºC for 60mins E. All of the above will achieve sterilisation

Last Answer : B. Boiling water at 100ºC for 2 hours

Description : The weight of a good quality brick when immersed in water for a period of 16 hours should not exceed the weight of dry brick (A) 20 % (B) 15 % (C) 10 % (D) None of these

Last Answer : Answer: Option A