Free Metals and Alloys MCQs with Answers
125 Metals and Alloys MCQs from Dental Materials, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
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- A. Inter metallic compounds
- B. Eutectic mixture
- C. Peritectic mixture
- D. Solid solution
Explanation: When components are completely miscible in the liquid state and remain uniformly mixed after solidification, they form a solid-solution…
Correct answer: Solid solution- A. Grain
- B. Nucleus
- C. Stroma
- D. None of the above
Explanation: A grain is a single crystal region within a polycrystalline metal, with atoms arranged in a specific orientation.
Correct answer: Grain- A. Inter atomic movement
- B. Arrangement of atoms
- C. Inter atomic imbalance
- D. Arrangement of molecules
Explanation: A space lattice is the regular three-dimensional arrangement of atoms in a crystalline solid.
Correct answer: Arrangement of atoms- A. Proportional limit
- B. Ultimate tensile strength
- C. Modulus of elasticity
- D. Flow
Explanation: Stiffness is resistance to elastic deformation and is measured by the modulus of elasticity.
Correct answer: Modulus of elasticity- A. Ternary alloy
- B. Eutectic alloy
- C. Peritectic allowy
- D. Solid solution
Explanation: A solid solution is considered the simplest alloy because atoms of one element are uniformly dissolved in the crystal lattice of another.
Correct answer: Solid solution- A. 960° Centigrade
- B. 1063° centigrade
- C. 850° Centrigrade
- D. 1123° Centrigrade
Explanation: Silver melts at about 960.8°C, usually rounded to 960°C in dental-materials MCQs.
Correct answer: 960° Centigrade- A. Vickers's hardness number
- B. Brinell hardness number
- C. Knoop hardness number
- D. Rockwell hardness number
Explanation: For gold alloys, Brinell hardness correlates with strength and can be used to estimate the proportional limit indirectly.
Correct answer: Brinell hardness number- A. Green flame
- B. Oxidizing flame
- C. Reducing flame
- D. All of the above
Explanation: The reducing zone of the flame is used for melting casting alloys because it limits oxidation of the molten metal.
Correct answer: Reducing flame- A. Sand blasting with aluminium oxide
- B. Cold HF
- C. Cold H2SO4
- D. Warm HCI
Explanation: Cast base-metal alloys are commonly cleaned by sandblasting with aluminium oxide, which removes investment remnants and surface oxides…
Correct answer: Sand blasting with aluminium oxide- A. a titanium
- B. Nickel-titanium
- C. Chrome-cobalt-nickel
- D. B titanium
Explanation: Nickel-titanium has a low elastic modulus and a very large elastic or superelastic range, allowing substantial recoverable deformation.
Correct answer: Nickel-titanium- A. Tempering
- B. Age hardening
- C. Work hardening
- D. Precipitation hardening
Explanation: Orthodontic stainless-steel wire is strengthened mainly by work hardening, produced when cold working increases dislocation density.
Correct answer: Work hardening- A. Is accomplished by soaking the casting in baking soda
- B. Causes porosity in gold
- C. Remove investment from gold casting
- D. Removes surface oxides from gold castings
Explanation: Pickling uses an acidic solution to dissolve surface oxides and tarnish from a casting, particularly after heating.
Correct answer: Removes surface oxides from gold castings- A. Austenite
- B. Ferrite
- C. Martensite
- D. Pearlite
Explanation: 18-8 stainless steel is predominantly austenitic because its chromium-nickel composition stabilizes the face-centred cubic austenite…
Correct answer: Austenite- A. Inlay wax type-II
- B. Casting wax
- C. Modelling wax
- D. Boxing wax
Explanation: The metal framework pattern of a removable partial denture is made with casting wax, often using prefabricated wax sheets and forms.
Correct answer: Casting wax- A. 0.4%
- B. 1.4%
- C. 2.4%
- D. 3.4%
Explanation: Gold casting alloys undergo about 1.4% linear contraction on solidification, although the exact value varies with alloy composition.
Correct answer: 1.4%16. Which of the following will produce the most rigid restoration for framework of same dimension ?
- A. Cobalt-chrome alloys
- B. Palladium alloys
- C. Wrought alloy
- D. Partial denture casting gold in hardened condition
Explanation: Rigidity for frameworks of identical dimensions depends mainly on the modulus of elasticity.
Correct answer: Cobalt-chrome alloys- A. Molybdenum
- B. Titanium
- C. Germanium
- D. Chromium
Explanation: Titanium can be copy milled as a relatively economical alternative to composite and ceramic materials, especially for dental frameworks…
Correct answer: Titanium- A. Alpha form
- B. Gamma form
- C. Beta form
- D. None of the above
Explanation: Austenite is the face-centred cubic, gamma-phase solid solution of carbon in iron.
Correct answer: Gamma form- A. Carats
- B. Percentage
- C. Fineness
- D. Gram
Explanation: Gold purity in dental alloys is commonly stated as fineness, meaning parts of pure gold per 1,000 parts of alloy.
Correct answer: Fineness- A. Austenite to ferrite
- B. Martensite to austenite
- C. Ferrite to austenite
- D. Austenite to martensite
Explanation: When stressed below its transformation temperature, NiTi changes from austenite to stress-induced martensite, allowing temporary…
Correct answer: Austenite to martensiteMetals and Alloys MCQs: common questions
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