OSSSC Nursing Officer Aptitude Marathon: Preparing for the OSSSC Nursing Officer 2026-27 competitive examination requires a high degree of proficiency in quantitative aptitude, clinical arithmetic, dosage calculations, and core medical knowledge. Quantitative aptitude and medical numerical reasoning are critical components of the Nursing Officer Aptitude paper in the upcoming OSSSC Exam 2027.
To support your preparation, we have compiled an upgraded Aptitude Marathon featuring 50 comprehensive Multiple-Choice Questions (MCQs). Each question is accompanied by step-by-step solutions or rationale to build your problem-solving speed and accuracy. Before diving into numerical calculations, make sure to review our comprehensive guide on Fundamentals Of Community Health Nursing MCQs to strengthen your medical math foundation.
Section 1: Quantitative & Clinical Arithmetic Aptitude
Q1. The LCM of two numbers is 720 and their HCF is 120. If one of the numbers is 240, what is the second number?
Correct Answer: A) 360
Rationale: The formula states that Product of two numbers = LCM × HCF. Therefore, Second Number = (720 × 120) / 240 = 360. Options B, C, and D reflect arithmetic division errors.
Q2. If a nurse needs to distribute 180 ml of oral solution into equal doses using bottles of either 12 ml, 15 ml, or 18 ml capacity without remainder, what is the HCF of these container sizes?
Correct Answer: B) 3 ml
Rationale: The Highest Common Factor (HCF) of 12 (2²×3), 15 (3×5), and 18 (2×3²) is 3. Option A is a factor of 12 and 18 but not 15, while C and D are not common factors to all three.
Q3. Four alarms in an intensive care unit (ICU) signal at intervals of 6, 8, 12, and 18 seconds respectively. If they chime together now, after how many minutes will they next chime simultaneously?
Correct Answer: A) 1.2 minutes
Rationale: Find the LCM of 6, 8, 12, and 18, which is 72 seconds. Converting seconds to minutes: 72 / 60 = 1.2 minutes. Options B, C, and D are incorrect conversions.
Q4. Calculate the HCF of the fractional dosages: 3/4, 9/16, and 6/8.
Correct Answer: A) 3/16
Rationale: HCF of fractions = (HCF of Numerators) / (LCM of Denominators). HCF(3, 9, 6) = 3; LCM(4, 16, 8) = 16; thus 3/16. Other choices confuse numerator LCM with HCF rules.
Q5. Determine the LCM of the fractions 4/5, 8/15, and 2/25.
Correct Answer: A) 8/5
Rationale: LCM of fractions = (LCM of Numerators) / (HCF of Denominators). LCM(4, 8, 2) = 8; HCF(5, 15, 25) = 5, yielding 8/5. The remaining options misuse denominator calculations.
Q6. The average patient vitals recorded across 5 clinical rounds were 12, 16, 20, 18, and X. If the arithmetic mean of these 5 readings is 17, find the value of X.
Correct Answer: A) 19
Rationale: Total sum required = Average × Count = 17 × 5 = 85. Sum of known readings = 12 + 16 + 20 + 18 = 66. X = 85 - 66 = 19.
Q7. In a ward of 10 pediatric patients, 4 patients have an average weight of 15 kg, and the remaining 6 patients have an average weight of 20 kg. What is the overall average weight of all 10 patients?
Correct Answer: B) 18.0 kg
Rationale: Total weight = (4 × 15) + (6 × 20) = 60 + 120 = 180 kg. Overall average = 180 / 10 = 18.0 kg. Option A incorrectly averages 15 and 20 directly without weighting.
Q8. A nursing supervisor purchases 10 units of disinfectant at $25 per unit and 15 units of disinfectant at $35 per unit. What is the weighted average price per unit?
Correct Answer: B) $31
Rationale: Total cost = (10 × 25) + (15 × 35) = 250 + 525 = $775. Total units = 25. Average price = 775 / 25 = $31. Other options result from unweighted arithmetic shortcuts.
Q9. The average age of 7 consecutive shift hours is 42. What is the value of the earliest (least) shift hour in this sequence?
Correct Answer: B) 39
Rationale: For consecutive integers, the mean is the middle value (4th term). The terms are 39, 40, 41, 42, 43, 44, 45. The smallest integer is 39.
Q10. The ratio of male to female nursing officers in a hospital is 3:5. If the total strength is 240 staff members, how many additional male officers are needed to make the ratio 1:1?
Correct Answer: A) 60
Rationale: Total parts = 8. Males = (3/8) × 240 = 90; Females = (5/8) × 240 = 150. To achieve a 1:1 ratio, males must equal females (150). Additional males required = 150 - 90 = 60.
For additional numerical practice, check out our OSSSC Nursing Officer Previous Year Model Papers.
Q11. The ratio of nurse-to-patient in a general medical ward is 2:9. If there are 54 patients, how many nurses are on duty?
Correct Answer: A) 12
Rationale: Let the multiplier be x. Patients = 9x = 54, so x = 6. Number of nurses = 2x = 2 × 6 = 12. Options B, C, and D are incorrect multiples.
Q12. The present combined age of a head nurse and a staff nurse is 80 years. Five years ago, the head nurse was twice as old as the staff nurse. What is the present age of the head nurse?
Correct Answer: B) 51.6 years
Rationale: Five years ago, combined sum was 80 - 10 = 70 years. Ratio H:S was 2:1 (3 parts = 70, so 1 part = 23.33). Head nurse age 5 years ago = 46.66. Present age = 51.66 years.
Q13. In a health survey, 48 out of 160 community members screened positive for hypertension. What percentage of the population is hypertensive?
Correct Answer: B) 30%
Rationale: Percentage = (48 / 160) × 100 = 0.3 × 100 = 30%. Options A, C, and D represent calculation inaccuracies.
Q14. Nurse A’s salary is 20% higher than Nurse B’s salary. By what percentage is Nurse B’s salary lower than Nurse A’s salary?
Correct Answer: B) 16.67%
Rationale: Let B = 100, then A = 120. Difference = 20. Percentage lower = (20 / 120) × 100 = 16.67%. A common pitfall is choosing 20% (Option A).
Q15. In a licensure exam, a candidate scores 45% marks and passes by 15 marks above the passing line. If the passing threshold is 120 marks, what are the maximum total marks?
Correct Answer: A) 300
Rationale: Marks obtained = 120 + 15 = 135. If 45% of total marks = 135, then Total Marks = (135 / 0.45) = 300.
Section 2: Pharmacological & Clinical Mathematics
Q16. A physician prescribes 500 mg of Amoxicillin. Available stock is 250 mg per 5 ml liquid. How many milliliters should the nurse administer?
Correct Answer: B) 10 ml
Rationale: Formula: (Desired / Have) × Volume = (500 / 250) × 5 ml = 2 × 5 ml = 10 ml. Options A, C, and D are incorrect dosing volumes.
Q17. An intravenous infusion of 1000 ml Normal Saline is ordered over 8 hours. The drop factor of the IV tubing is 15 gtt/ml. Calculate the flow rate in drops per minute (gtt/min).
Correct Answer: A) 31 gtt/min
Rationale: Flow rate (gtt/min) = (Total Volume in ml × Drop Factor) / (Time in minutes) = (1000 × 15) / (8 × 60) = 15000 / 480 = 31.25 ≈ 31 gtt/min.
Q18. A patient is prescribed 0.125 mg of Digoxin orally. The pharmacy dispenses Digoxin tablets rated at 62.5 micrograms (mcg) per tablet. How many tablets should be administered?
Correct Answer: B) 2 tablets
Rationale: Convert 0.125 mg to mcg: 0.125 × 1000 = 125 mcg. Number of tablets = 125 mcg / 62.5 mcg = 2 tablets.
Q19. A pediatric client weighing 16 kg is prescribed a drug at 10 mg/kg/day divided into 2 equal daily doses. How many milligrams should be given per dose?
Correct Answer: B) 80 mg
Rationale: Total daily dose = 16 kg × 10 mg/kg = 160 mg/day. Divided into 2 doses = 160 / 2 = 80 mg per dose. Option A represents the full daily total.
Q20. An IV pump is infusing Heparin at 1,200 units/hour. The IV bag contains 25,000 units of Heparin in 500 ml D5W. What is the pump setting in ml/hr?
Correct Answer: A) 24 ml/hr
Rationale: Concentration = 25,000 units / 500 ml = 50 units/ml. Flow rate = 1,200 units/hr / 50 units/ml = 24 ml/hr.
Enhance your pharmacology preparation by reviewing our comprehensive guide on OSSSC Nursing Officer Important MCQS 2026.
Section 3: Nursing Officer Professional & Clinical Practice
Q21. Which anatomical structure acts as the primary pacemaker of the human heart under normal physiological conditions?
Correct Answer: B) Sinoatrial (SA) node
Rationale: The SA node intrinsically generates electrical impulses at 60-100 bpm, serving as the primary cardiac pacemaker. The AV node and Purkinje fibers act as secondary back-up pacemakers.
Q22. A client presenting with severe dehydration exhibits an elevated serum sodium level of 152 mEq/L. Which electrolyte imbalance does the nurse record?
Correct Answer: C) Hypernatremia
Rationale: Normal serum sodium ranges between 135-145 mEq/L. Values exceeding 145 mEq/L indicate hypernatremia. Hyponatremia refers to sodium below 135 mEq/L.
Q23. Which acid-base disturbance is indicated by arterial blood gas (ABG) values of pH 7.28, PaCO2 55 mmHg, and HCO3- 24 mEq/L?
Correct Answer: B) Respiratory Acidosis
Rationale: Low pH (< 7.35) confirms acidosis, while elevated PaCO2 (> 45 mmHg) with normal bicarbonate indicates uncompensated respiratory acidosis.
Q24. During blood transfusion therapy, a client suddenly complains of low back pain, chills, and dyspnea. What is the nurse's immediate priority action?
Correct Answer: B) Stop the transfusion immediately
Rationale: Symptoms indicate an acute hemolytic transfusion reaction. The immediate priority is to stop the infusion to prevent further exposure, then maintain IV line access with normal saline.
Q25. Which position is most appropriate for a client immediately following a percutaneous liver biopsy to minimize hemorrhage risk?
Correct Answer: B) Right side-lying position
Rationale: Placing the client on their right side applies pressure to the liver site against the chest wall, promoting hemostasis and reducing bleeding risk.
Q26. What is the standard compression-to-ventilation ratio for adult basic life support (BLS) performed by a single rescuer?
Correct Answer: B) 30:2
Rationale: Current AHA guidelines mandate a 30:2 ratio of chest compressions to rescue breaths for single-rescuer adult CPR.
Q27. A patient receiving Warfarin therapy has an International Normalized Ratio (INR) of 5.5 without active bleeding. The nurse anticipates administering which reversal agent?
Correct Answer: B) Vitamin K (Phytonadione)
Rationale: Vitamin K reverses Warfarin toxicity by promoting hepatic synthesis of clotting factors II, VII, IX, and X. Protamine sulfate antagonizes Heparin.
Q28. Which sign observed during physical assessment indicates meningeal irritation?
Correct Answer: B) Brudzinski's sign
Rationale: Brudzinski's sign (involuntary flexion of hips/knees upon neck flexion) indicates meningeal irritation. Trousseau's and Chvostek's signs reflect hypocalcemia.
Q29. What is the maximum recommended duration for continuous endotracheal suctioning in an adult patient to prevent hypoxia?
Correct Answer: B) 10 to 15 seconds
Rationale: Suctioning should be limited to 10-15 seconds per pass to minimize suction-induced hypoxemia and mucosal trauma.
Q30. Which isolation precaution tier is required when caring for a client diagnosed with active Pulmonary Tuberculosis?
Correct Answer: C) Airborne Precautions
Rationale: Mycobacterium tuberculosis is transmitted via droplet nuclei (< 5 microns) that remain suspended in air, requiring airborne precautions (N95 mask, negative-pressure room).
For more clinical scenario questions, read our complete post on Medical Surgical Nursing Quiz.
Section 4: Advanced Nursing Aptitude & Clinical Reasoning
Q31. In Glasgow Coma Scale (GCS) assessment, a patient opens eyes to sound, uses inappropriate words, and localizes pain. What is the patient's GCS score?
Correct Answer: B) 12
Rationale: Eye opening to voice = 3; Verbal response (inappropriate words) = 3; Motor response (localizes pain) = 5. Total score = 3 + 3 + 5 = 11. Correction: 3+3+5 = 11 (Option C).
Q32. A burn client weighs 70 kg and has 40% Total Body Surface Area (TBSA) burns. Using the Parkland formula (4 ml × kg × %TBSA), calculate the total fluid requirement in the first 24 hours.
Correct Answer: A) 11,200 ml
Rationale: Fluid requirement = 4 ml × 70 kg × 40 = 11,200 ml Lactated Ringer's. Half (5,600 ml) is administered over the first 8 hours.
Q33. Which ECG alteration is classic for severe hyperkalemia?
Correct Answer: B) Tall, peaked T waves
Rationale: Hyperkalemia causes tall, peaked T waves, widened QRS complexes, and PR interval prolongation. Prominent U waves are associated with hypokalemia.
Q34. What is the primary therapeutic mechanism of action of loop diuretics such as Furosemide?
Correct Answer: B) Inhibiting Na+/K+/2Cl- cotransporter in the thick ascending limb of Henle's loop
Rationale: Furosemide acts specifically on the thick ascending limb of Henle's loop to block electrolyte reabsorption, driving profound diuresis.
Q35. A postpartum client experiences heavy vaginal bleeding with a soft, boggy uterus. What is the initial nursing intervention?
Correct Answer: B) Perform uterine fundal massage
Rationale: Uterine atony is the leading cause of postpartum hemorrhage. Immediate fundal massage stimulates uterine muscle contraction to reduce bleeding.
Q36. Which cranial nerve is evaluated when assessing a patient's gag reflex and swallowing capability?
Correct Answer: B) Cranial Nerve IX (Glossopharyngeal) and X (Vagus)
Rationale: Cranial Nerves IX and X coordinate sensory and motor pathways controlling the pharyngeal reflex and swallowing functions.
Q37. An orthopedic client in traction reports severe, unrelenting pain unresponsive to opioids, accompanied by paresthesia and pallor in the extremity. What condition is suspected?
Correct Answer: B) Compartment Syndrome
Rationale: Pain out of proportion to injury, along with paresthesia, pallor, and pulselessness, heralds Compartment Syndrome, requiring immediate emergency decompression (fasciotomy).
Q38. What is the gold-standard bedside method for verifying initial placement of a small-bore nasogastric (NG) feeding tube?
Correct Answer: B) Radiographic (X-ray) confirmation
Rationale: Chest/abdominal radiography is the only definitive method to verify correct NG tube placement prior to initiating feedings or medications.
Q39. Which laboratory parameter must be closely monitored during systemic administration of Unfractionated Heparin infusion?
Correct Answer: B) Activated Partial Thromboplastin Time (aPTT)
Rationale: Therapeutic heparin anticoagulation is evaluated using aPTT (target usually 1.5-2.5 times baseline control). PT/INR is used to monitor Warfarin.
Q40. A psychiatric nurse cares for a client demonstrating firm, fixed false beliefs ungrounded in reality. How is this psychopathology classified?
Correct Answer: C) Delusion
Rationale: Delusions are fixed false beliefs. Hallucinations involve false sensory perceptions without external stimuli, while illusions represent misperceptions of real external stimuli.
Review additional clinical scenario questions in our study guide covering OSSSC Nursing Officer Complete Exam Syllabus & Strategy.
Q41. A child with nephrotic syndrome exhibits marked generalized edema. Which dietary modification should the nurse reinforce?
Correct Answer: B) Low sodium, adequate protein
Rationale: Sodium restriction reduces fluid retention and edema, while adequate protein helps replace urinary protein losses without overloading renal function.
Q42. Which diagnostic test provides definitive diagnosis of Pernicious Anemia?
Correct Answer: B) Schilling test
Rationale: The Schilling test measures vitamin B12 absorption with and without intrinsic factor, distinguishing pernicious anemia from other malabsorption syndromes.
Q43. A client receiving total parenteral nutrition (TPN) via a central line runs out of solution before the next bag arrives. Which solution should be infused temporarily?
Correct Answer: B) 10% Dextrose in Water (D10W)
Rationale: Sudden cessation of high-concentration glucose in TPN can cause severe rebound hypoglycemia. Infusing D10W at the same rate maintains blood glucose levels.
Q44. What clinical finding characterizes the early hyperdynamic stage of septic shock?
Correct Answer: B) Warm, flushed skin and bounding pulse
Rationale: In early (warm) septic shock, peripheral vasodilation and compensatory increased cardiac output cause warm, flushed skin and bounding peripheral pulses.
Q45. Which intervention is essential when caring for a client with a chest tube drainage system to prevent atmospheric air from entering the pleural space?
Correct Answer: B) Maintaining the water seal chamber filled to the prescribed level
Rationale: The water seal acts as a one-way valve allowing air and fluid to exit the pleural cavity while preventing air from re-entering.
Q46. A pregnant client at 32 weeks gestation experiences painless, bright red vaginal bleeding. Which condition should the nurse suspect?
Correct Answer: B) Placenta Previa
Rationale: Painless, bright red bleeding in the third trimester is characteristic of placenta previa. Abruptio placentae presents with painful, dark red bleeding and abdominal rigidity.
Q47. Which electrolyte disturbance increases the risk of Digoxin toxicity in a patient taking loop diuretics?
Correct Answer: B) Hypokalemia
Rationale: Hypokalemia enhances myocardial sensitivity to digoxin, increasing the risk of life-threatening digitalis toxicity and arrhythmias.
Q48. Which vaccine is contraindicated in pregnant women due to potential risk to the fetus?
Correct Answer: C) MMR (Measles, Mumps, Rubella)
Rationale: Live attenuated vaccines like MMR and Varicella are contraindicated during pregnancy due to theoretical risks of teratogenic effects on the developing fetus.
Q49. A client exhibits Trousseau's sign (carpopedal spasm when blood pressure cuff is inflated). Which serum laboratory value confirms this finding?
Correct Answer: A) Calcium 7.2 mg/dL
Rationale: Trousseau's sign indicates neuromuscular hyperexcitability caused by hypocalcemia (normal serum total calcium is 8.5-10.5 mg/dL).
Q50. Which legal concept applies when a nurse performs a procedure without obtaining informed consent from a competent patient?
Correct Answer: B) Battery
Rationale: Battery is the intentional, unconsented physical contact with another person. Performing a medical procedure without valid consent constitutes battery under health law.
Summary and Exam Strategy
To excel in the OSSSC Nursing Officer 2027 exam, candidates should maintain a structured daily study plan that balances numerical aptitude with clinical concepts. Developing speed in dosage calculations, ratio simplifications, and electrolyte values will help secure top marks in the competitive Nursing Officer Aptitude paper.
