2023 - Multiple Choice Questions

Calculate the O2 content in a patient with Hb 100g/L, breathing FiO2 0.21, saturating 100%, paO2 100mmHg with Hufner’s constant 1.34
  1. 13.7 ml/dL
  2. 16.4 ml/dL
  3. 18.7 ml/dL
  4. 24.7 ml/dL
What is the most lateral structure at the level of the larynx?
  1. Sternocleidomastoid muscle
  2. Posterior triangle of neck
  3. Common carotid artery
  4. Hyoid bone
Which organ is the most important in immediate (minutely) control of plasma potassium following a meal?
  1. Skeletal muscle
  2. Liver
  3. Lung
  4. Skin
Which organ is not involved in calcium homeostasis?
  1. Liver
  2. Kidney
  3. Lung
  4. Small intestine
Which has the greatest impedance to ultrasound waves?
  1. Air
  2. Bone
  3. Muscle
  4. Tissue
What is the half life of alteplase?
  1. 2-3 mins
  2. 5 mins
  3. 30 mins
  4. 1-2 hr
Which is the most sensitive to detect a partial phase I block from depolarizing muscle blocking agent?
  1. No post tetanic facilitation
  2. Incomplete tetany from 5 seconds stimulation at 50-100Hz
  3. TOF <0.7
  4. Single twitch at 1Hz
In which setting would you expect to find EEG waves
  1. REM sleep
  2. NREM sleep stage 3
  3. Awake resting
  4. Short term memory recall
Where do thiazide diuretics work?
  1. Distal convoluted tubule
  2. Proximal convoluted tubule
  3. Ascending limb of loop of Henle
  4. Descending limb of loop of Henle
What describes the range of ambient temperatures at which metabolic processes to maintain heat are minimal?
  1. Thermoneutral zone
  2. Interthreshold range
  3. Thermo-comfort zone
  4. Thermophile
Mechanism of action of verapamil
  1. Blocks activated calcium channels
  2. Blocks activated and inactivated calcium channels
  3. Blocks activated sodium channels
  4. Blocks activated and inactivated sodium channels
Compared to hydrocortisone, which describes the potency of dexamethasone’s mineralocorticoid activity
  1. 0
  2. 0.5
  3. 4
  4. 30
Rhesus has the following antigens on RBC
  1. B
  2. C
  3. D
  4. R
What increases the probability of turbulent flow?
  1. Decreased density
  2. Increased viscosity
  3. Decreased viscosity
  4. Increased diameter
Effectiveness of vancomycin determined by
  1. Time above MIC
  2. Concentration divided by MIC
  3. AUC divided by MIC
  4. Time below MIC
Static compliance uses pressure difference between alveolus and
  1. Pleural space  
  2. Atmospheric pressure
  3. Mouth pressure
  4. Airway pressure
Prolonged duration of action of midazolam for elderly is due to:
  1. Reduced liver function
  2. Reduced renal clearance
  3. Reduced cardiac output
  4. Increased total body fat
Which describes the mechanism of action of oseltamivir?
  1. Prevent release of virus particle
  2. Prevent viral replication
  3. Prevent viral entry into host cells
  4. Prevent adhesion of virus onto cell membrane
What is the INR of a unit of fresh frozen plasma?
  1. 0.5
  2. 0.8
  3. 1.0
  4. 1.5
Which has the least glucocorticoid activity?
  1. Aldosterone
  2. Cortisol
  3. Prednisolone
  4. Dexamethasone