192 COMEDK Previous Years Solved Papers C O M E D K 2 0 1 1 192 COMEDK 2011 8 ANATOMY 1. All of the fo llowing canals open on the posterior wall of the pterygo palatine fossa EXCEPT A. Gre ater pa lat ine canal B. Foramen Ro tundum C. Pt er ygo id c ana l D. Palatovagina l canal 2. Ulti mobronc hial bo dy forms A. ‘C’ cel ls of thyr oid gla nd B. Princi pal cells of parathy roid gland C. Aci dop hil s of pitu ita ry glan d D. Pituic ytes of pitu itar y gland 3. Openings of the posteri or alv eolar canals are seen on A. Pos teri or max ill ary sur face B. Late ral maxi lla ry sur fac e C. Intr a te mpo ral sur face D. Pte rygo pal ati ne f ossa 4. Hypogloss al nerve sup plies all the muscles EXCEPT A. St yl oglossu s B. St yl ophar yng ius C. Pala togl os sus D. Ge nioglossu s 5. One of the fo llowing nerve is the motor nerve for occipital belly of occipitofrontalis A. Gr eat auri cular B. Lesser occipital C. Thir d occi pi tal D. Pos teri or auricular 6. Infect ion from the dange rous are a of fac e spreads via one of the following veins A. Max il lary vein B. Ret romandibular vei n C. Sup erf ici al tempor al vei n D. Ophth al mi c vei ns PHYSIOLOGY 7. In a ne rve, the magnitude of t he action potential overshoot is normally a function of the A. Magn itude of the s timulu s B. Intracel lular potassi um concen tration C. Extrace llula r sodium concen tration D. Res ting memb rane potentia l 8. Contrac tion in smooth muscle is ini tiated when calcium binds to A. Calbindin B. Ca lmodul in C. Tro po ni n D. Tr opomyosin 9. Non – myelinated axons differ from myelinated ones in that they A. Are more exci tab le B. Lack node s of Ranvier C. Are not ca pable of r enerati on D. Are n ot as sociate d wit h Schwann ce lls 10. All the fol lowi ng hormo nes bind to ce ll surface receptors of the target tissues EXCEPT A. Thyroi d stimu lat ing hor mone B. Gl ucag on C. Es trogen D. Epinephr ine
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73. Thrombocytopenia due to increasedplatelet destruction is seen in
A. Aplastic anemiaB. Cancer chemotherapyC. Acute leukemiaD. Systemic lupus erythematosus
74. Von willibrand’s disease is due to theA. Deficiency of factor X and factor IVB. Deficiency of factor XII and factor IXC. Deficiency of factor VII and decreased
platelet adhesionD. Deficiency of factor X and factor V
75. Neo Natal teeth erupt at
A. At birthB. In first 30 daysC. In first WeekD. In first 2 Week
76. Which of these is NOT a pre – malignant
condition for oral cancersA. LeukoplakiaB. Apthous ulcersC. ErythroplekiaD. Submucous fibrosis
77. Frey’s syndrome is caused due to the injuryof
A. Lesser occipital nerveB. Auriculo temporal nerveC. Supra trochlear nerveD. Infra orbital nerve
78. Aspirate which is creamy white viscoidwith the value of total protein less than5.0 gms/ 100 ml is suggestive of
A. Infected cystB. Dentigerous cystC. Odontogenic KeratocystD. Ranula
effects in which the severity of responseA. Is proportional to the doseB. Is determined by the operatorC. Depends on composition of tissueD. Depends on volume of exposed tissue
100. Which of the following interactions doesnot cause film fog
A. Coherent scatteringB. Transient scatteringC. Photoelectric absorptionD. Compton scattering
101. Cervical burnout is a phenomenon causedby decreased X – ray absorption in thecervical region of
A. Teeth with proximal cariesB. Normal teethC. Teeth with root cariesD. Hypoplastic teeth
102. Following organ is LEAST radiosensitiveto the effects of exposure to radiation
A. TestisB. Bone marrowC. Muscle
D. Intestine103. “Sharpened pencil” appearance of
mandibular condyle on a radiographindicates
A. OsteoarthritisB. Rheumatoid arthritisC. Infectious arthritisD. Juvenile arthrosis
104. Compared with calcium tungstate screens,rare earth screens decrease patientexposure by about
A. 15%B. 35%C. 55%D. 75%
105. The minimum amount of tooth deminera-lization required for radiographicdetection of dental caries is
A. 20%
B. 40%
C. 60%D. 80%
ORTHODONTICS
106. Clock wise rotation refers to Mandibularrotation
A. Downward and posteriorlyB. Downward and anteriorlyC. Upward and anteriorlyD. Upward and posteriorly
107. Mobility of teeth in carcinoma of Maxillary
sinus is due to involvement by tumor ofA. Anterior wall of the sinusB. Posterior wall of the sinusC. Roof of the sinusD. Floor of the sinus
108. When protraction headgear was used, mostof the orthopedic changes are observedwithin the first ______
A. 1 monthB. 3–4 monthsC. 8–10 monthsD. 1 years
109. Who proposed the ‘Nasal Septum theoryof craniofacial growth
A. MossB. SicherC. Vander LindenD. Lathan
110. Quad helix is used to correct
A. Posterior cross biteB. Anterior cross biteC. Lateral open biteD. Deep bite
111. Schubiger attachment has a screw basecommon to the
A. Introfix attachmentB. Quintivan attachmentC. C shaped ringD. Gerber attachment
138. Trace elements presents in drinking waterare reported to be caries protective is
A. SeleniumB. IronC. VanadiumD. Iodine
139. A progressive increase or decrease of adisease over a long period of time,generally several years or decades isknown as
A. Secular trendsB. Cyclic trendsC. Seasonal trendsD. Periodic fluctuations
140. The ratio of rates of occurrence is
A. Attributable riskB. Relative riskC. Occurring risk
D. Distribution risk141. Over jet and overbite of malocclusion is
assessed using WHO survey form 1997with the help of instrument
A. Williams probeB. CPI probeC. Measuring scaleD. Straight probe
142. Examination is carried in individualclinical practice corresponding terms inpublic health practice is
A. DiagnosisB. EvaluationC. Assessment of needD. Appraisal and review
PROSTHODONTICS
143. The technique to produce limited removalof epithelial tissue in the sulcus while achamfer finish line is being created in toothstructure is called
A. Soft tissue modificationB. GingettageC. Gingival displacementD. Electrosurgery
144. For accurate interocclusal records thematerial of choice is
A. 28 gauge casting wax
B. ZOE Bite registration pasteC. Elastomeric bite registration materialD. Base plate wax
145. Hanau H2 articulator has a intercondylardistance of
A. 90 mmB. 100 mmC. 110 mmD. 120 mm
146. The untimate in finish lines that permit anacute margin of metal is
A. Shoulder
B. ChamferC. Knife edgeD. Shoulder with Bevel
147. According to Atwood’s residual ridgeclassification order III denotes
A. High well roundedB. Low well roundedC. Knife edgeD. Depressed
A. 100 to 200 AºB. 200 to 300 AºC. 300 to 400 AºD. 400 to 500 Aº
150. The cell type of periodontium that plays arole in pathogenesis as well as healing is
A. EpithelialB. LangerhansC. FibroblastD. Mast cell
151. The most reliable indicator of gingivalinflammation is
A. Color changeB. Change in the contourC. Change in consistencyD. Bleeding on probing
152. BANA test measures activity of
A. CalculusB. CathepsinC. ElastaseD. Trypsin like enzyme
153. Soluble components of complementsystem account for about
A. 1 -2 mg/ml of total serum proteinB. 3 -4mg/ml of total serum proteinC. 5 -7 mg/ml of total serum proteinD. 7 -8 mg/ml of total serum protein
154. Haversian systems (osteons) are foundprimarily in the
A. Spongy boneB. PeriosteumC. Alveolar bone properD. Endosteum
155. Furcation involvements is best diagnosedby
A. Nabers probeB. Williams probeC. Michigan ‘o’ probeD. Explorer
156. Definitive information regarding the bone
architecture is obtained byA. Periodontal probingB. Radiographic examinationC. Combination of probing & radiographsD. Surgical exposure of the osseous defect
157. Brushite crystal forms of calculus is morecommon in
A. Maxillary anteriorB. Maxillary posteriorC. Mandibular anteriorD. Mandibular posterior
158. These fibers in the lamina propria of thegingiva, help to bind the free gingiva to thetooth
A. AlveologingivalB. CircularC. DentoperiostealD. Dentogingival
159. Transplantation between geneticallydifferent members of the same species istermed as
destruction in such infection isA. Reshaping the gingiva (Gingivoplasty)B. Resection of the gingiva (Gingivectomy)C. Apically displaced flap surgeryD. Coronally displaced flap surgery
CONS AND ENDO
164. The treatment of choice for acuteirreversible pulpits is
A. PulpotomyB. PulpectomyC. Direct pulp capping
D. Indirect pulp capping
165. Which of the following is true also thermaland electrical tests after trauma
A. Sensitivity tests evaluate the nerve andcirculatory condition of the tooth
B. False positive tests are more likely thanfalse negative tests
C. It may take up to nine months fornormal blood flow to return
D. It may take a few hours for normal bloodflow to return
166. The potentially hazardous irrigant causingan emergency during treatment is
A. SalivaB. ChlorhexidineC. Sodium HypochloriteD. Metrogyl
167. In which of the following is one visit rootcanal treatment not advocated
A. Pulp is necrotic and not symptomaticB. Pulp is necrotic and symptomaticC. Pulp is necrotic and there is a draining
sinus tract
D. Pulp is vital and symptomatic168. The tip diameter of a 245 bur used for
conventional amalgam preparation is
A. 2 mmB. 0.8 mmC. 0.4 mmD. 0.3 mm
169. Mode of failure during dislodgement of
prosthesis cemented with zinc polycarboxylate cement is usually seen at the
A. Cement tooth interfaceB. Cement prosthesis interfaceC. Cleavage through the cement layerD. Fracture of tooth or prosthesis
170. In pin retained amalgam restoration,failure is more likely to occur at the
A. Pin restoration interfaceB. Pin dentin interfaceC. Both of the aboveD. Inside of restoration (Restoration
fracture)
171. 90º butt joint for silver amalgampreparation is done because of
A. Fear of marginal failure of amalgamB. Amalgam has poor strength in thin
sectionsC. Amalgam is stronger than tooth
structureD. Amalgam is weaker in compression
172. pH of which cement remains below 7 evenafter 1 month after insertion into the cavity
A. GICB. Zinc phosphateC. Resin cementD. Silicate cement
173. How long does it take for an etched enamelto return to normal conditions
A. 30 daysB. 24 hoursC. 96 hoursD. 1 week
174. Which lasers can be used to cure compositeresins
Ref: U.Sathyanarayana and U.Chakrapani,3/E, p. 216
12. Ans: B
Ref: U.Sathyanarayana and U.Chakrapani,3/E, p. 186
13. Ans: B
Ref: U.Sathyanarayana and U.Chakrapani,3/E, p. 718
14. Ans: B
Ref: U.Sathyanarayana and U.Chakrapani,3/E, p. 55
Explanation
• Nitrogen conent of the total dietary proteinis 16% 50gms proteins contain 50 × 16/100=8 gms
GENRAL PATHOLOGY
15. Ans: B
Ref: Robbins Pathological Basis of Disease,7/E, p. 737
16. Ans: A
Ref: Robbins Pathological Basis of Disease,7/E, p. 10
17. Ans: D
Ref: Robbins Pathological Basis of Disease,7/E, p. 403
Explanation
• In malignant cerebral malaria caused byP. faliparum, brain vessels are pluggedwith parasitized red cells, each cellcontaining dots of hemozoin pigmentcalled “Malarial or Durck granules” andsmall focal inflammatory reactions arecalled “Malarial or Durck granulomas”
18. Ans: B
Ref: Robbins Pathological Basis of Disease,7/E, p. 53