medical MCQs – Page 138

Practise multiple-choice questions from medical for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

medical Mcqs

1. oral anatomy 2. microbiology 3. oral pathology and medicine 4. physiology 5. biochemistry 6. general anatomy 7. dental materials 8. pharmacology 9. pathology 10. oral histology

2741. Impression compound is characterized by all of the following except_______________?
0

A. Shows increased flow when kneaded with water

B. Low coefficient of thermal conductivity

C. Warps at room temperature

D. Is a thermoset material

2742. Which material undergoes hysteresis ?
0

A. Reversible hydrocolloid

B. Impression plaster

C. Irreversible hydrocolloid

D. Metallic oxide paste

2743. The ranking of tear strength from the lowest to highest of all impression materials generally is as follows_______________?
0

A. Silicones, hydrocolloids, polyether, polysulfide

B. Polysulfide, hydrocolloids, silicones, polyether

C. Hydrocolloids, silicones, polyether, polysulfide

D. Hydrocolloids, polyether, silicones, polysulfide

2744. Silica sol__________________?
0

A. Increase the strength and the setting expansion of the phosphate-bonded investment

B. Acts as a retarder in the silica bonded investments

C. Is applied to the walls of the investment to produce hygroscopic expansion

D. Acts as a refractory in the Silica bonded investments

2745. Hardening solutions are used with impression made of________________?
0

A. Zinc oxide eugenol

B. Impression compound

C. Hydrocolloid

D. Elastomer

2746. The solvent flux used for base metal soldering is_______________?
0

A. Borax

B. Rouge

C. Fluoride

D. Boric acid

2747. Rough surface of elastomeric impression results from_______________?
0

A. Incomplete polymerization caused by premature removal from mouth

B. Inadequate mixing

C. Air bubbles

D. Too rapid polymerization

2748. Boxing wax is also called as________________?
0

A. Sticky wax

B. Inlay wax

C. Utility wax

D. Carding wax

2749. The function of a sprue is to_______________?
0

A. Form an opening of molten metal to enter the mold

B. Help polish cast restorations

C. Eliminate air bubbles on the wax pattern

D. Reproduce fine detail

2750. All of the following statements about cast cobalt alloy are true EXCEPT_____________?
0

A. They have higher ductility than gold alloys

B. They have a modulus of elasticity twice that of gold alloys

C. They are more rigid than gold alloys

D. They have a lower proportional limit than gold alloys

2751. One of the most important advantages of truly elastic impression material would be its capacity for______________?
0

A. Close adaptation to soft tissues

B. Compatibility with gypsum products

C. Reproduction of surface details

D. With drawl without permanent distortion

2752. Which of the following increases castability of base metal alloys________________?
0

A. Molybdenum

B. Beryllium

C. Carbon

D. Tin

2753. Finer particle size of silica______________?
0

A. Normal setting expansion

B. Greater the hygroscopic expansion

C. No setting expansion

D. Slower the hygroscopic expansion

2754. Finishing and polishing of Amalgam make the restoration______________?
0

A. Increased compressive strength

B. Decrease the tarnish and corrosion resistance

C. Increase in tarnish and corrosion resistance

D. Increase the marginal strength

2755. Eugenol may be replaced in the zinc oxide eugenol cement by______________?
0

A. Phosphoric acid

B. Acetic acid

C. Ortho-ethoxy acid

D. Alginic acid

2756. Which of the following is true about direct filling gold______________?
0

A. None of the above

B. Properly condensed mat gold has no voids

C. Whatever may be the type voids are inherent

D. Voids can be avoided with manual condensation

2757. Over-trituration of silver alloy and mercury_______________?
0

A. Increases the strength of lathe cut alloy but reduces the strength of spherical alloy amalgam

B. Gives al dull and crumbly amalgam

C. Reduces contraction

D. Decreases creep

2758. Water powder ratio of dental stone and plaster is respectively_________________?
0

A. 0.6 and 3.2

B. 0.28 and 0.6

C. 0.28 and 0.98

D. 0.6 and 0.28

2759. A patient who has had a recent amalgam filling in the upper teeth has a gold filling in the lower teeth, the patient complains of pain. The reason for this can be mainly_____________?
0

A. Pulp exposure

B. Improper amalgam filling

C. Galvanism

D. None of the above

2760. Which is not true about high copper amalgam alloys______________?
0

A. High tensile strength

B. Low creep

C. Low Hg: Alloy ratio

D. Low tensile and compressive strength

Previous Next

Showing 2741 to 2760 of 10266 mcqs