2451. The strength of a gypsum investment is dependent on_______________?
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A. Gypsum

B. Carbon content

C. Copper

D. Silica content

2452. The melting point of silver is_____________?
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A. 960 Centigrade

B. 850 Centrigrade

C. 1063 centigrade

D. 1123 Centrigrade

2453. Etchant preferred in gel from than in liquid form________________?
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A. None of the above

B. Better control over placement

C. Helps in visualization while placement

D. Enhance and concentrate the action of acid

2454. The simplest alloy is a_______________?
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A. Ternary alloy

B. Peritectic allowy

C. Solid solution

D. Eutectic alloy

2455. ASO (Antistreptolysin 0) test is uesd for the diagnosis of________________?
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A. Rheumatie fever

B. Typhoid fever

C. Rheumatoid arthritis

D. Rickettsial fever

2456. Setting expansion is advantageous in__________________?
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A. Casts

B. Investment

C. Dies

D. Models

2457. Electron microscopic examination of the bacterial flora of necrotising ulcerative gingivitis indicates the presence of microorganisms within non-necrotic tissues in advance of other bacteria. The organisms involved are______________?
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A. Filamentous rods

B. Spirochetes

C. Bacteriophages

D. Cocci

2458. Salivary peroxidise system is known to be effective agianst________________?
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A. Streptococcus mutans

B. Actinomyces viscosus

C. Lactobacillus acidophilus

D. Veilonella parvula

2459. Quartz tungsten light cure device minimum output of energy should not be less than_____________?
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A. 350 mw/cm2

B. 450 mw/cm2

C. 300 mw/sm2

D. 400 mw/cm2

2460. The most common coupling agents are organic silicon compound called_______________?
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A. Parabane

B. Silane

C. Chelane

D. Ligane

2461. NiTi alloy have_______________?
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A. Shape memory

B. Weldable properties

C. Corrosion resistance

D. Hyper rigidity

2462. Tempering of steel cause________________?
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A. decreases its toughness

B. Increase ductility

C. Increases hardness

D. Increases its toughness

2463. The contraction of gold alloy on solidifying is approximately_____________?
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A. 2.40%

B. 1.4%

C. 0.40%

D. 3.40%

2464. Cross linking in denture base resin is contributed by_____________?
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A. N-para toluidine

B. Glycol dimetharylate

C. Benzoyl peroxide

D. Methyl methacrylate

2465. Each of the following can cause food poisoning except________________?
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A. Cl. botulinum

B. Staphylococcus

C. Cl. welchii

D. Cl. difficile
2466. Gram -ve bacteria stain during gram staining____________?
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A. Colorless

B. Blue color

C. Red color

D. Green

2467. The chemical used to etch enamel is_______________?
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A. Eugenol

B. Phosphoric acid

C. Methyl methacrylate

D. Zinc oxide

2468. Brazilian test is used to determine the ultimates tensile strength of_________________?
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A. Brittle materials

B. Malleable materials

C. Ductile materials

D. Flexible materials

2469. Q fever is caused by________________?
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A. C. burnetti

B. R. prowozekii

C. R. quintana

D. Rickettsia tsutsugamushi

2470. Pathogenesis of diphtheria is attributed to__________________?
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A. Capsule

B. Endotoxin

C. Exotoxin

D. Invasion

2471. Lepromin test is useful for________________?
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A. Prognosis

B. Epidemiology

C. Treatment plan

D. Diagnosis

2472. A thinner mix of a gypsum bonded investment will_______________?
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A. Increase setting expansion

B. Produce a smoother casting

C. Decrease setting expansion

D. Increase thermal expansion

2473. The commonly used laser for curing composite resin is______________?
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A. CO2

B. Argon

C. ER:YAG

D. Nd:YAG

2474. Porosity of denture base is due to_______________?
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A. Inadequate pressure

B. Packing at dough stage

C. Curing at 160F for 9 hrs

D. All of the above
2475. Cold cure acrylic expand in water by___________?
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A. 10% by volume 0.23% by weight

B. 0.1% by volume 0.23% by weight

C. None of the above

D. 1% by volume 0.23% by weight
2476. Granules in the corynebacterium diphtheria are called by following names, except______________?
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A. Babes Ernst granules

B. Refractile granules

C. Metachromatic granules

D. Voluntin granules

2477. The forces that hold atoms together are called_____________?
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A. Secondary forces

B. Cohesive forces

C. Ionic forces

D. Primary forces

2478. Insufficient closure of the flasks during packing of denture base resin can result in_____________?
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A. Poor colour stability

B. Increase in vertical dimension

C. Decrease in vertical dimension

D. Less polymerization shrinkage

2479. Culture medium for corynebacterium diphtheria______________?
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A. Saborauds agar

B. Lowenstein Jensen Medium

C. Mc Conkey

D. Loefflers serum slope
2480. A crystal in metal substructure is_______________?
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A. Grain

B. Stroma

C. None of the above

D. Nucleus

2481. For adhesion to be present between solid and liquid________________?
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A. Should have high contact angle

B. Liquid should wet solid surface

C. None of the above

D. Mechanical interlocking should be present

2482. What is the polymerization shrinkage if 3:1 powder: liquid ratio is used____________?
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A. 10%

B. 8%

C. 6%

D. 21%

2483. The mechanism of genetic transfer where a phage serves as a vehicle is_______________?
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A. Transduction

B. Conjugation

C. Translation

D. Lysogeny
2484. Stainless steel orthodontic wire can be hardened by________________?
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A. Work hardening

B. Age hardening

C. Precipitation hardening

D. Tempering

2485. VLC resins are also called as______________?
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A. Heat activated resins

B. Light activated resins

C. Tertiary amine-activated resins

D. Microwave-activated resins

2486. Widal test is specific for____________?
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A. Plague

B. Leprosy

C. Typhoid

D. Pemhigoid

2487. Maxwell Voigt Model is to determine________________?
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A. Elastic Behaviour

B. Plastic Behaviour

C. Viscoelastic Behaviour

D. All of the above

2488. All are true about widel test except________________________?
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A. H antigen cannot differentiate between subtypes

B. High titre value in a single widal test is not confirmative

C. O antibodiest last longer and hence is not indicative of recent infection

D. Base lines differ depending on the endemicity of the disease

2489. cAMP reaction is shown by which streptococci ?
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A. Group D

B. Group A

C. Group C

D. Group B
2490. A fluid having constant viscosity that does not depend upon the strain rate is said to be_______________?
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A. Plastic

B. Pseudoplastic

C. Viscoelastic

D. Newtonian
2491. KHN value of Amalgam is_________________?
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A. 343

B. 67

C. 90

D. 450

2492. Nagglers reaction detects________________?
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A. Hyaluronidase

B. Lecithinase

C. None of the above

D. Coagulase

2493. One of the claims for the superiority composite resin restoration over silicate cement restorations is that the resin restorations_____________?
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A. Are practically insoluble in oral fluids

B. Prevent galvanic action

C. Have a higher coefficient of thermal expansion

D. Adapt to the walls of the cavity better

2494. The type of spatula used to mix composite is________________?
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A. Stainless steel

B. None of the above

C. Iron

D. Plastic
2495. One of the following is a treponemal test for diagnosis of syphilis_____________?
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A. FTAB

B. Kahn test

C. Widal test

D. Wasserman test

2496. Dentin bonding agents usually contain_____________?
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A. Only Hydrophobic component

B. Lyophillic and lyophobic component

C. Hydrophobic and hydrophilic component

D. Only Hydrophilic component

2497. Causative agents of Vincents angina_____________?
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A. Leptospira and Treponema pallidum

B. Borrelia recurrents and bateroides

C. Borrelia vincenti and fusobacterium fusiformis

D. Borrelia burgoloferi and lactobacillus

2498. The single most important laboratory test for determining the virulence of staphylococci is___________?
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A. Hemolysis of sheep erythrocytes

B. Mannitol fermentation

C. Detection of coagulase

D. The catalase test

2499. The % of free monomer in a heat cured acrylic resin is_______________?
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A. 3% to 5%

B. 0.2% to 0.5%

C. 8% to 10%

D. 0.6% to 0.8%

2500. Which of the following procedure is indicated to produce cross-linking in the polymerization of linear chains of acrylic_______________?
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A. Addition of grain refining agents

B. Incorporation of terminating agents

C. Addition of difunctional monomers

D. Increasing the amount of heat required for linear polymerization