📌 Introduction
Diuretics are an important class of drugs used in conditions like hypertension, edema, and heart failure. They are frequently asked in GPAT, DSSSB, and other pharmacy exams. These MCQs will help you revise key concepts quickly and effectively.
📝 MCQs on Diuretics
1. Diuretics increase:
A) Blood sugar
B) Urine output
C) Heart rate
D) Oxygen
✔ Answer: B) Urine output
2. Loop diuretics act on:
A) Proximal tubule
B) Loop of Henle
C) Distal tubule
D) Collecting duct
✔ Answer: B) Loop of Henle
3. Furosemide is a:
A) Thiazide
B) Loop diuretic
C) Osmotic diuretic
D) CA inhibitor
✔ Answer: B) Loop diuretic
4. Thiazide diuretics act on:
A) Loop
B) Distal tubule
C) Proximal tubule
D) Collecting duct
✔ Answer: B) Distal tubule
5. Hydrochlorothiazide is used in:
A) Cancer
B) Hypertension
C) Infection
D) Diabetes
✔ Answer: B) Hypertension
6. Potassium-sparing diuretics:
A) Increase K⁺ loss
B) Prevent K⁺ loss
C) Destroy K⁺
D) Increase Na⁺
✔ Answer: B) Prevent K⁺ loss
7. Spironolactone is:
A) Loop
B) Thiazide
C) Potassium-sparing
D) Osmotic
✔ Answer: C) Potassium-sparing
8. Osmotic diuretic example:
A) Furosemide
B) Mannitol
C) Spironolactone
D) Thiazide
✔ Answer: B) Mannitol
9. Mannitol is used in:
A) Hypertension
B) Glaucoma
C) Infection
D) Diabetes
✔ Answer: B) Glaucoma
10. CA inhibitors act on:
A) Loop
B) Proximal tubule
C) Distal tubule
D) Collecting duct
✔ Answer: B) Proximal tubule
11. Acetazolamide is:
A) Loop
B) Thiazide
C) CA inhibitor
D) Osmotic
✔ Answer: C) CA inhibitor
12. Loop diuretics inhibit:
A) Na⁺-Cl⁻
B) Na⁺-K⁺-2Cl⁻
C) K⁺
D) Ca²⁺
✔ Answer: B) Na⁺-K⁺-2Cl⁻
13. Thiazides inhibit:
A) Na⁺-K⁺
B) Na⁺-Cl⁻
C) Ca²⁺
D) Mg²⁺
✔ Answer: B) Na⁺-Cl⁻
14. Major side effect of loop diuretics:
A) Hyperkalemia
B) Hypokalemia
C) Diabetes
D) Cancer
✔ Answer: B) Hypokalemia
15. Potassium-sparing may cause:
A) Hypokalemia
B) Hyperkalemia
C) Low BP
D) Infection
✔ Answer: B) Hyperkalemia
16. Diuretics are used in:
A) Edema
B) Infection
C) Cancer
D) Fever
✔ Answer: A) Edema
17. Which reduces blood pressure?
A) Diuretics
B) Antibiotics
C) NSAIDs
D) Hormones
✔ Answer: A) Diuretics
18. Thiazides are first-line for:
A) Infection
B) Hypertension
C) Cancer
D) Pain
✔ Answer: B) Hypertension
19. Loop diuretics are:
A) Weak
B) Moderate
C) Powerful
D) None
✔ Answer: C) Powerful
20. Diuretics may cause:
A) Dehydration
B) Growth
C) Sleep
D) Energy
✔ Answer: A) Dehydration
21. Which drug blocks aldosterone?
A) Spironolactone
B) Furosemide
C) Mannitol
D) Thiazide
✔ Answer: A) Spironolactone
22. Diuretics act on:
A) Liver
B) Kidney
C) Heart
D) Brain
✔ Answer: B) Kidney
23. Osmotic diuretics increase:
A) Osmotic pressure
B) Blood sugar
C) Hormones
D) Enzymes
✔ Answer: A) Osmotic pressure
24. Which is used in brain edema?
A) Mannitol
B) Furosemide
C) Thiazide
D) Spironolactone
✔ Answer: A) Mannitol
25. Diuretics decrease:
A) Blood volume
B) Oxygen
C) Sugar
D) Protein
✔ Answer: A) Blood volume
26. Which causes least K⁺ loss?
A) Loop
B) Thiazide
C) Potassium-sparing
D) Osmotic
✔ Answer: C) Potassium-sparing
27. Which is fastest acting?
A) Loop
B) Thiazide
C) CA inhibitor
D) Potassium-sparing
✔ Answer: A) Loop
28. Diuretics may cause:
A) Electrolyte imbalance
B) Growth
C) Sleep
D) Immunity
✔ Answer: A) Electrolyte imbalance
29. Which is used in heart failure?
A) Diuretics
B) Antibiotics
C) NSAIDs
D) Vitamins
✔ Answer: A) Diuretics
30. Best use of diuretics:
A) Infection
B) Fluid removal
C) Pain
D) Diabetes
✔ Answer: B) Fluid removal
🎯 Conclusion
These 30 MCQs on diuretics will help you strengthen your pharmacology concepts and improve exam performance. Practice regularly for GPAT and DSSSB success.
👉 Read full notes here: https://pharmacymcq.in/diuretics-classification-mechanism-uses-sideeffects/