medical MCQs – Page 131

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 Review each marked answer and report any item that may be outdated or unclear.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

2601. When making a polysulphide impression for a caste crown, custom trays are usually preferred over stock trays for all of the following reasons except_______________?
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A. Impressions made n the custom trays are easier to remove from the mouth

B. Custom trays facilitate uniform contraction of impression material

C. Custom trays require less impression material

D. Stock trays may be short in the flange area

2602. Gold content of an 18 carat alloy is______________?
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A. 50%

B. 25%

C. 75%

D. 100%

2603. Setting of POP is result of______________?
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A. Difference in solubility of CaSo4 H2O + CaSO4+ 2H2O

B. Reaction between hemihydrate and hihydrate

C. Nucleation and growth of CaSo4 H2O crystals

D. Reaction between CaSO4+ 2H2O and water

2604. Palladium is added to polyvinyl siloxane to_____________?
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A. Acts as plasticizer

B. Act as a scavenger

C. Acts as a catalyst

D. Helps as surfactant

2605. The setting time of irreversible hydrocolloids can be decreased by_____________?
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A. Using excess water for maxing

B. Raising the temperature of water used for maxing

C. None of the above

D. Lowering the temperature of water used for mixing

2606. Air bubbles formed on the surface of casting is probably due to________________?
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A. Improper angulation of sprue

B. Improper heating of the investment

C. Improper wetting of the wax pattern by the investment

D. Improper casting pressure

2607. Investment material used for cobalt-chromium alloys is_____________?
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A. Phosphate bonded

B. Gypsum bonded

C. Silica bonded

D. None of the above

2608. As per DNA No. 25, minimum amount of setting expansion required for type V gypsum products_______________?
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A. 0.2

B. 0.10

C. 0.05

D. 0.15

2609. Shape memory is seen in________________?
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A. Stainless steel wire

B. Aluminium

C. TMA wire

D. NITTINOL wire

2610. The process of changing the rubber base product or liquid polymer, to a rubber like material is generally known as_____________?
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A. Boiling

B. Chain lengthening

C. Vulconization

D. Condensation

2611. Setting time of ZOE is best controlled by______________?
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A. Cooling the glass slab

B. Adding a drop of water

C. Adding a drop of eugenol

D. Altering ratio of two pastes

2612. The water powder ratio of alginate is______________?
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A. 40 ml of water to 15 gms of powder

B. 15 ml of water to 40 gms of powder

C. 40 ml of water to 40 gms of powder

D. 100 ml of water to 60 gms of powder

2613. Heavy and light body impression materials are use with______________?
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A. Silicone

B. A and B

C. Mercaptan

D. Reversible hydrocolloid

2614. Which of the following impression material is rigid ?
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A. Reversible hydrocolloid

B. Polysulphide rubber

C. Zinc oxide-eugenol

D. Alginate

2615. Putty wash technique_________________?
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A. Light body first and putty later

B. Light body and putty used at the same time

C. None of the above

D. Putty used first and light body used second

2616. The inlay wax most commonly used for direct technique_____________________?
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A. Type 2

B. Type 1

C. Type 4

D. Type 3

2617. Annealing is also known as_______________?
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A. Soft hardening treatment

B. Stress relieving heat treatment

C. Hard hardening treatment

D. Precipitating heat treatment

2618. Which is the use of boxing an impression______________?
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A. Preserving the sulci

B. Ease of construction of denture

C. Ease of pouring an impression

D. All of the above

2619. Retarder in Zinc oxide eugenol is______________?
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A. Glycerine

B. Zinc acetate

C. CaCl2

D. Alcohol

2620. The maximum carbon content of steel used in dentistry is__________________?
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A. 4%

B. 2%

C. 19%

D. 1.7%

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