Dental Materials Quiz 5
1 / 50
A rough / Chalky surface of the cast is due to_______________?
2 / 50
The ? (Beta) hemihydrate of gypsum requires more water to float its powder particles because______________?
3 / 50
Which one of the following is used as filler in composite resins ?
4 / 50
Annealing is also known as_______________?
5 / 50
Quartz in investment material is added for_______________?
6 / 50
Which of the following impression material requires a hardener ?
7 / 50
All of the following is used as accelerator in zinc oxide eugenol cement except_______________?
8 / 50
The relative hardness of elastomere is determined using________________?
9 / 50
The main difference between dental stone and dental plaster is______________?
10 / 50
Which of the following refractory is used to counteract most of the expansion________________?
11 / 50
Localised shrinkage porosity is seen when there________________?
12 / 50
Nickel is added to wrought gold alloys as______________?
13 / 50
Co-efficient of thermal expansion is highest for_____________?
14 / 50
Which of the waxes are derived from the lignite_________________?
15 / 50
For photo-curing the composite resin the light source______________?
16 / 50
The setting time of irreversible hydrocolloids can be decreased by_____________?
17 / 50
The main form of iron carbide found in 18-8 steel________________?
18 / 50
About polymerization shrinkage of composite all are true, except______________?
19 / 50
Silica sol__________________?
20 / 50
Age hardening is a process done at______________?
21 / 50
Most ideally elastic among the following_______________?
22 / 50
Stainless steel orthodontic wire can be hardened by________________?
23 / 50
Green strength with reference to plaster means_____________?
24 / 50
Brush heap structure is found in______________?
25 / 50
Gases dissolved in molten metals are liberated when cooled giving rise to________________?
26 / 50
Polysulfide material is routinely not recommended because of_______________?
27 / 50
Creep value of which of the following is the highest ?
28 / 50
Percentage of tin in low copper alloy is______________?
29 / 50
The setting of zinc phosphate is accelerated by_____________?
30 / 50
Best marginal seal is provided by____________?
31 / 50
The melting point of titanium is __________ degree celsius?
32 / 50
Gypsum is used for________________?
33 / 50
Which is best material for RPD impression_______________?
34 / 50
PH of which cement remain below 7 even after 1 month after insertion into the cavity ?
35 / 50
Percentage of gold in high noble alloy is______________?
36 / 50
Greening occuring when porcelains are fired on silver free alloys may be attributed to________________?
37 / 50
As per DNA No. 25, minimum amount of setting expansion required for type V gypsum products_______________?
38 / 50
Minimum thickness for type I zinc phosphate cement should be_______________?
39 / 50
Stages of annealing in order_________________?
40 / 50
Flux used in dental ceramic is________________?
41 / 50
Electrolyte used for plating copper dies is________________?
42 / 50
In processing methyl methacrylate, the resin may show porosity if the flask is placed too soon porosity most likely occur_____________?
43 / 50
In Base metal alloys, Corrosion resistance occurs due to___________________?
44 / 50
Casting shrinkage is compensated by_______________?
45 / 50
Which of the following physical property can be used to estimate indirectly the proportional limit of gold alloys ?
46 / 50
Porcelain binds to metal in PFM crown by_________________?
47 / 50
Ability of an orthodontic wire to spring back to its original shape is evaluated by_____________?
48 / 50
Which of the following statement is true regarding lathe cut low Copper silver alloy ?
49 / 50
The chemical used to etch enamel is_______________?
50 / 50
In a metal ceramic crown for a FPD the function of tin, indium which are readily oxidized minor constituents is to________________?
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