Right coronary artery arises from:

 # Right coronary artery arises from:

A. Anterior aortic sinus

B. Posterior aortic sinus

C. Right aortic sinus

D. Left aortic sinus

The correct answer is A. Anterior aortic sinus.

An aortic sinus is one of the anatomic dilations of the ascending aorta, which occurs just above the aortic valve. These widenings are between the wall of the aorta and each of the three cusps of the aortic valve. 

There are generally three aortic sinuses: (one anterior and 2 posterior sinus) 

• Right coronary artery arises from anterior aortic sinus of ascending aorta. 

• Left coronary artery arises from left posterior aortic sinus. 

• Right posterior aortic sinus is non-coronary sinus. 

A sphygmomanometer reading can be correct only when:

 # A Sphygmomanometer reading can be correct only when :

A. Deflation is 5-10 mm Hg per heart beat 

B. cuff is slightly full on applying to patient's arm 

C.  the cuff width is 25% of the diameter of the patient's arm 

D. length of the bladder encircle 80% of the patient's arm 

The correct answer is D. length of the bladder encircle 80% of the patient's arm.

Choosing appropriate sized cuff is vital to record accurate blood pressure in children. Small sized cuff gives elevated blood pressure readings and bigger sized cuffs give low blood pressure reading. The inflatable bladder inside the cuff should have an ideal width of at least 40% of the mid arm circumference and a cuff length that is 80 - 100% of the arm circumference. 

Nomenclature of Hand Instruments

# The shape of the shank of an instrument is described by: 

A. Class 

B. Subclass 

C. Suborder 

D. Order 

The correct answer is B. Subclass.

Dr. G.V. Black established a nomenclature for hand instruments, similar to the biological classification. 

1. Order : Purpose of instrument Eg : excavator or scaler. 

2. Suborder : Position or manner of use Eg : Push, pull 

3. Class : Form of working end, Eg : hatchet, chisel. 

4. Subclass : Shape of shank Eg : Monoangle or binangle. 

Naming usually moves from 4 to 1. 

Which of the following teeth have more than one occlusal form?

 # Which of the following teeth have more than one occlusal form?

A. Maxillary first premolar

B. Maxillary second premolar

C. Maxillary first molar

D. Mandibular first molar

The correct answer is C. Maxillary first molar.

The maxillary first molar is the largest tooth in volume and one of the most complex in root and canal anatomy. The pulp chamber is widest in the buccolingual dimension, and four pulp horns are present (mesiobuccal, mesiopalatal, distobuccal, and distopalatal). The pulpchamber's cervical outline form has a rhomboid shape, sometimes with rounded corners. The mesiobuccal angle is an acute angle; the distobuccal angle is an obtuse angle; and the palatal angles are basically right angles. 

Commonest site for venous ulcer is:

 # Commonest site for venous ulcer is:

A. Instep of foot

B. Lower 1/3rd leg and ankle

C. Lower 2/3rd of leg

D. Middle 1/3rd of leg

The correct answer is B. Lower 1/3rd leg and ankle.

Venous ulcer is the commonest ulcer of the leg. The basic cause of venous ulcer is abnormal venous hypertension in the lower-third of the leg, ankle and dorsum of the foot. This ulcer may be associated with demonstrable varicose veins or may follow thrombosis and phlebitis in the deep and perforating veins. 

Eicosapentaenoic acid (EPA) is present in:

 # Eicosapentaenoic acid (EPA) is present in:

A. Soyabean oil

B. Corn oil

C. Sunflower oil

D. Fish oil

The correct answer is D. Fish oil.

Eicosapentaenoic acid (EPA) is one of several omega-3 fatty acids. It is found in cold-water fatty fish, such as salmon. It is also found in fish oil supplements, along with docosahexaenoic acid (DHA). Omega-3 fatty acids are part of a healthy diet that helps lower risk of heart disease.

Which of the following cements have highest water solubility?

 # Which of the following cements have highest water solubility? 

A. Zinc phosphate 

B. Zinc oxide eugenol 

C. Zinc silicophosphate 

D. Zinc polycarboxylate 

The correct answer is C. Zinc silicophosphate.

Of the given choices, ZOE cements have the highest solubility in oral environment. But, water solubility of ZOE is less while that of silicophosphate is quite high. The oral solubility is different from water solubility. This is because the oral environment is mildly acidic while the water is neutral. Thus, in oral environment, ZOE has maximum solubility while in water, silicophosphate has maximum water solubility.