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Medical Mcqs

Shape memory in NiTi is because of stress induced form__________________?

July 31, 2021July 25, 2019 by admin
Shape memory in NiTi is because of stress induced form__________________?

A. Austenite to martensite
B. Martensite to austenite
C. Ferrite to austenite
D. Austenite to ferrite

Categories Dental Materials, Medical Mcqs, Metallurgy

Casting shrinkage is compensated by_______________?

July 31, 2021July 25, 2019 by admin
Casting shrinkage is compensated by_______________?

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

Categories Dental Materials, Medical Mcqs, Metallurgy

The gold alloys used for casting contain at least…. percent of precious metal according to ADA specification number 5________________?

July 31, 2021July 25, 2019 by admin
The gold alloys used for casting contain at least…. percent of precious metal according to ADA specification number 5________________?

A. 55
B. 65
C. 75
D. 85

Categories Dental Materials, Medical Mcqs, Metallurgy

Impurities in casting is removed by________________?

July 31, 2021July 25, 2019 by admin
Impurities in casting is removed by________________?

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

Categories Dental Materials, Medical Mcqs, Metallurgy

Shape memory is seen in________________?

July 31, 2021July 25, 2019 by admin
Shape memory is seen in________________?

A. Stainless steel wire
B. NITTINOL wire
C. TMA wire
D. Aluminium

Categories Dental Materials, Medical Mcqs, Metallurgy

The best pickling solution for gypsum bonded investment is_______________?

July 31, 2021July 25, 2019 by admin
The best pickling solution for gypsum bonded investment is_______________?

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

Categories Dental Materials, Medical Mcqs, Metallurgy

Corrosion of stainless steel is due to formulation of_________________?

July 31, 2021July 25, 2019 by admin
Corrosion of stainless steel is due to formulation of_________________?

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

Categories Dental Materials, Medical Mcqs, Metallurgy

The rapid decrease in tensile strength and increase in ductility of a wrought metal is seen in which stage of annealing ?

July 31, 2021July 25, 2019 by admin
The rapid decrease in tensile strength and increase in ductility of a wrought metal is seen in which stage of annealing ?

A. Recovery stage
B. Recrystallisation stage
C. Grain growth stage
D. All of the above

Categories Dental Materials, Medical Mcqs, Metallurgy

Which one of the following categories of dental materials has the highest thermal conductivity_________________?

July 31, 2021July 25, 2019 by admin
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

Categories Dental Materials, Medical Mcqs, Metallurgy

Most biocompatible material in oral cavity is_______________?

July 31, 2021July 25, 2019 by admin
Most biocompatible material in oral cavity is_______________?

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

Categories Dental Materials, Medical Mcqs, Metallurgy
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