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Updated Medical MCQs – Competitive Metallurgy ( Dental Materials ) MCQs

Updated Medical MCQs – Competitive Metallurgy ( Dental Materials ) MCQs

This post is comprising of latest ” ( Dental Materials ) MCQs – Latest Competitive Medical MCQs “. Here you’ll get latest Software engineering mcqs for written test, interview with answers. If you want to improve your knowledge regarding Software engineering then read these mcqs of Design of Steel Structures.

Latest Medical MCQs

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Latest Metallurgy ( Dental Materials ) Mcqs

The most occurred mcqs of Metallurgy ( Dental Materials ) in past papers. Past papers of Metallurgy ( Dental Materials ) Mcqs. Past papers of Metallurgy ( Dental Materials ) Mcqs . Mcqs are the necessary part of any competitive / job related exams. The Mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Metallurgy ( Dental Materials ) Mcqs. The Important series of Metallurgy ( Dental Materials ) Mcqs are given below:

Which of the following is correct________________?

A. Type I and IV gold can be heat treated and annealed
B. Type III and Type IV gold can be heat treated and annealed
C. Type I and Type II gold can be heat treated and annealed
D. All the type of gold can be heat treated and annealed

Setting expansion is advantageous in__________________?

A. Models
B. Casts
C. Investment
D. Dies

Back pressure porosity can be avoided by________________?

A. Using a short and wide sprue
B. Placing the sprue at least one quarter inch away form the end of casting ring
C. Preventing rapid heating the investment in burnout oven
D. Using asbestos linear

Which of the following zones is used for melting alloy during casting______________?

A. Reducing flame
B. Green flame
C. Oxidizing flame
D. All of the above

Cleaning of base metal alloy is done by______________?

A. Cold HF
B. Warm HCI
C. Cold H2SO4
D. Sand blasting with aluminium oxide

Which one of the following is most elastic ?

A. plutonium
B. titanium
C. Chrome-cobalt-nickel
D. Nickel-titanium

A thinner mix of a gypsum bonded investment will_______________?

A. Increase setting expansion
B. Decrease setting expansion
C. Produce a smoother casting
D. Increase thermal expansion

Stainless steel orthodontic wire can be hardened by________________?

A. Age hardening
B. Work hardening
C. Tempering
D. Precipitation hardening

Pickling________________?

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

NiTi alloy have_______________?

A. Shape memory
B. Corrosion resistance
C. Hyper rigidity
D. Weldable properties

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

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

The strength of a gypsum investment is dependent on_______________?

A. Silica content
B. Carbon content
C. Gypsum
D. Copper

Ideal requirement of metal ceramic casting____________?

A. Bonding between ceramic and alloy
B. Matching of coefficients of thermal expansion of ceramics and alloy
C. Low fusing ceramic and high fusing alloys
D. All of the above

The pattern for the metallic framework of a removable partial denture is fabricated from________________?

A. Inlay wax type-II
B. Modelling wax
C. Boxing wax
D. Casting wax

Restorative Resins MCQs

The contraction of gold alloy on solidifying is approximately_____________?

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

Tempering of steel cause________________?

A. Increases hardness
B. Increases its toughness
C. Increase ductility
D. decreases its toughness

Which of the following will produce the most rigid restoration for framework of same dimension ?

A. Palladium alloys
B. Wrought alloy
C. Cobalt-chrome alloys
D. Partial denture casting gold in hardened condition

Apart from composites and ceramics, another material that could be copy milled easily and inexpensively is_________________?

A. Germanium
B. Molybdenum
C. Titanium
D. Chromium

Austenite is an alloy of iron of and carbon with the iron in______________?

A. Beta form
B. Alpha form
C. Gamma form
D. None of the above

Which zone is the hottest and efficient burning zone of the flame used for casting ?

A. Oxidizing zone
B. Combustion zone
C. Reducing zone
D. None of the above

Localised shrinkage porosity is seen when there________________?

A. Thin sprue
B. Investment heated strongly
C. No reservoir
D. Inadequate air discharge

Sub surface porosity can be decreased by_______________?

A. Increasing the melting temperature
B. Decreasing the sprue thickness
C. Decreasing the sprue length
D. Increasing the mould temperature

The inlay wax most commonly used for direct technique_____________________?

A. Type 1
B. Type 3
C. Type 2
D. Type 4

The purity of gold is expressed in________________?

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

In a metal ceramic crown for a FPD the function of tin, indium which are readily oxidized minor constituents is to________________?

A. Improve bonding
B. They react with the porcelain opaque layer, which masks the metal
C. Decrease porosity
D. Improves the thermal expansion between the metal and porcelain

Investment material used for cobalt-chromium alloys is_____________?

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

Silica sol__________________?

A. Acts as a retarder in the silica bonded investments
B. Increase the strength and the setting expansion of the phosphate-bonded investment
C. Is applied to the walls of the investment to produce hygroscopic expansion
D. Acts as a refractory in the Silica bonded investments

Boxing wax is also called as________________?

A. Carding wax
B. Utility wax
C. Inlay wax
D. Sticky wax

Dental Cements MCQs

Shape memory in NiTi is because of stress induced form__________________?

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

Casting shrinkage is compensated by_______________?

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

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

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

Impurities in casting is removed by________________?

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

Shape memory is seen in________________?

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

The best pickling solution for gypsum bonded investment is_______________?

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

Corrosion of stainless steel is due to formulation of_________________?

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

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

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

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

A. Porcelains
B. Gold alloys
C. Unfilled acrylic plastics
D. Zinc phosphate cements

Most biocompatible material in oral cavity is_______________?

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

Which of the waxes are derived from the lignite_________________?

A. Inlay wax
B. Paraffin wax
C. Microcrystalline wax
D. Montan wax

Silver plated dyes use an electrolytic bath of_______________?

A. Silver bromide
B. Silver cyanide
C. Silver fluorides
D. Silver iodide

Suck back porosity is due to_________________?

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

Air bubbles formed on the surface of casting is probably due to________________?

A. Improper heating of the investment
B. Improper casting pressure
C. Improper angulation of sprue
D. Improper wetting of the wax pattern by the investment

Asbestos liner is used in a casting ring to________________?

A. Retard the heating of the investment
B. Facilitate venting of the mold
C. Permit expansion of the world
D. All of the above

Which of the following decrease with strain hardening______________?

A. Strength
B. Surface hardness
C. Proportion limit
D. Corrosion resistance

Impression Materials MCQs

Suck back porosity in the casting can be eliminated by________________?

A. Increasing the flow of molten metal
B. Increasing the mould metal temperature difference
C. Flaring the point of the sprue attachment
D. All of the above

The component in very minor quantity in stainless steel that changes the properties to a maximum level is____________?

A. Carbon
B. Chromium
C. Molybdenum
D. Nickel

Binder used in Gypsum investment is_________________?

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

Nickel-Titanium alloy has__________________?

A. low spring back
B. Unreliable spring back
C. Minimal spring back
D. None of the above

Advantage of titanium over other base metal alloys_______________?

A. Low weight
B. Low strength
C. Low cost
D. Low melting point

Component of inlay wax which makes it flake resistant is_____________?

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

Microstructure of cobalt chromium alloy in cast condition is______________?

A. Homogeneous
B. Fibrous
C. Inhomogenous
D. amorphous

Dendrites in cst alloys form by mechanism of_________________?

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

Compared with noble metals, base metals show_______________?

A. Increased hardness
B. Better biocompatibility
C. Increased ductility
D. Increased density

Mechanical properties of Cp Titanium are similar to alloys_____________?

A. Type III and Type IV gold
B. Type VII and type VIII gold
C. Type V and type VI gold
D. None of the above

The effects associated with cold working can be eliminated by a heat treatment called______________?

A. Homogenization heat treatment
B. Annealing heat treatment
C. Age hardening heat treatment
D. Solution heat treatment

With indirect spruing. Which one of the following porosities can be minimised_______________?

A. Pin hole porosity
B. Localized shrinkage porosity
C. Back pressure porosity
D. Micro porosity

The linear solidification shrinkage of Type IV Ni-Cr based alloys is_______________?

A. 2.3%
B. 1.37%
C. 1.56%
D. 3%

Which of the following cast gold alloys is used for fabricating partial denture frameworks______________?

A. Type I – Hard
B. Type II – Soft
C. Type III – Hard
D. Type IV – Extra Hard

Modern dental noble metal casting alloys generally have equiaxed fine grain structures because of the incorporation of small amounts of______________?

A. Indium
B. Chromium
C. Irridium
D. Palladium

Nickel is added to wrought gold alloys as______________?

A. Strengtherner
B. Scavenger
C. Whitens the alloy
D. Hardener

Updated Medical MCQs – Competitive Metallurgy ( Dental Materials ) MCQs