Dental Materials MCQs

Page No. 41

The main ingredient of inlay wax is__________________?


aCandelelia wax

✖


bParaffin wax

✓


cCarnauba wax

✖


dGum dammar

✖


View Answer Paraffin wax

Casting flux is used to_______________?


aPrevent the oxidation of the metal during melting

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bincrease the melting point of the flux

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cFlaring the point of the sprue attachment

✓


dNone of the above

✖



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


aSuckback porosity

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bGas inclusion porosity

✓


cLocalized shrinkage porosity

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dMicro porosity

✖



Percentage of gold in high noble alloy is______________?


aN 25%

✖


b25%

✖


c>40%

✓


d0%

✖


View Answer >40%

Which of the following is function of fluoride flux in soldering process ?


aIt prevents the formation of copper oxide

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bIt prevents the formation of chromium oxide or dissolves chromic oxide layer

✓


cIt prevents the flow of material in undesirable area

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dIncrease the strength of solder

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Which one of the following elements is NOT added is small amount to be used as grain refiners ?


aIridium

✖


bRuthinium

✖


cIndium

✖


dPlatinum

✓


View Answer Platinum

Binder in phosphate bonded investment is______________?


aMagnesium oxide & phosphate

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bMagnesium oxide & phosphoric acid

✖


cMagnesium oxide & Monoammonium phosphate

✓


dMagnesium oxide & ortho phosphoric acid

✖



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


aHydrogen

✖


bNatural gas

✖


cAcetylene

✖


dPropane

✓


View Answer Propane

Which of the following increases castability of base metal alloys________________?


aTin

✖


bBeryllium

✓


cMolybdenum

✖


dCarbon

✖


View Answer Beryllium

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


aGreater than the substrate material

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bLesser than the substrate material

✓


cEqual to the substrate material

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dTemperature not relevant

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