A. Attached impurities on undersurface of casting
B. Hot spot
C. No rapid cooling
D. Inadequate melting temperature
Correct Answer: Hot spot ✔
Last Updated: February 07, 2020
Related MCQs
- Which of the following is correct__________?
- Setting expansion is advantageous in__________?
- Back pressure porosity can be avoided by__________?
- Which of the following zones is used for melting alloy during casting__________?
- Cleaning of base metal alloy is done by__________?
- Which one of the following is most elastic ?
- A thinner mix of a gypsum bonded investment will__________?
- Stainless steel orthodontic wire can be hardened by__________?
- Pickling__________?
- NiTi alloy have__________?
- The main form of iron carbide found in 18-8 steel__________?
- The strength of a gypsum investment is dependent on__________?
- Ideal requirement of metal ceramic casting__________?
- The pattern for the metallic framework of a removable partial denture is fabricated from__________?
- The contraction of gold alloy on solidifying is approximately__________?
- Tempering of steel cause__________?
- Which of the following will produce the most rigid restoration for framework of same dimension ?
- Apart from composites and ceramics, another material that could be copy milled easily and inexpensively is__________?
- Austenite is an alloy of iron of and carbon with the iron in__________?
- Which zone is the hottest and efficient burning zone of the flame used for casting ?
- Localised shrinkage porosity is seen when there__________?
- Sub surface porosity can be decreased by__________?
- The inlay wax most commonly used for direct technique__________?
- The purity of gold is expressed in__________?
- In a metal ceramic crown for a FPD the function of tin, indium which are readily oxidized minor constituents is to__________?
- Investment material used for cobalt-chromium alloys is__________?
- Silica sol__________?
- Boxing wax is also called as__________?
- Shape memory in NiTi is because of stress induced form__________?
- Casting shrinkage is compensated by__________?
- The gold alloys used for casting contain at least…. percent of precious metal according to ADA specification number 5__________?
- Impurities in casting is removed by__________?
- Shape memory is seen in__________?
- The best pickling solution for gypsum bonded investment is__________?
- Corrosion of stainless steel is due to formulation of__________?
- The rapid decrease in tensile strength and increase in ductility of a wrought metal is seen in which stage of annealing ?
- Which one of the following categories of dental materials has the highest thermal conductivity__________?
- Most biocompatible material in oral cavity is__________?
- Which of the waxes are derived from the lignite__________?
- Silver plated dyes use an electrolytic bath of__________?
- Air bubbles formed on the surface of casting is probably due to__________?
- Asbestos liner is used in a casting ring to__________?
- Which of the following decrease with strain hardening__________?
- Suck back porosity in the casting can be eliminated by__________?
- The component in very minor quantity in stainless steel that changes the properties to a maximum level is__________?
- Binder used in Gypsum investment is__________?
- Nickel-Titanium alloy has__________?
- Advantage of titanium over other base metal alloys__________?
- Component of inlay wax which makes it flake resistant is__________?
- Microstructure of cobalt chromium alloy in cast condition is__________?
- Dendrites in cst alloys form by mechanism of__________?