NMC CBT Nurse practice questions and answers 2026. Tap an option to test yourself — you'll see the correct answer and a plain-English explanation for every question. Free, no login.
Q21The prescribed dose is 300 mg and the available strength is 150 mg per tablet. How many tablets must be given?
✓ Correct answer: B. 2 tablets
300 mg divided by 150 mg per tablet gives exactly 2 tablets. Why the other options are incorrect: • 1 tablet: One tablet supplies only 150 mg, which is half the required dose. • 3 tablets: Three tablets deliver 450 mg, exceeding the prescription by 150 mg. • 4 tablets: Four tablets total 600 mg — double the amount prescribed. • 5 tablets: Five tablets give 750 mg, significantly more than the ordered dose.
Q22A patient has consumed 200 ml of water and 150 ml of juice. What is their combined fluid intake?
✓ Correct answer: C. 350 ml
200 ml + 150 ml = 350 ml total fluid intake. Why the other options are incorrect: • 250 ml: 250 ml omits 100 ml from the total, leaving part of the intake uncounted. • 300 ml: 300 ml is 50 ml short of the correct total. • 400 ml: 400 ml overstates the intake by 50 ml. • 450 ml: 450 ml is 100 ml more than the actual combined intake.
Q23A patient's fluid output includes 400 ml of urine and 150 ml of vomit. What is the total recorded output?
✓ Correct answer: C. 550 ml
400 ml + 150 ml = 550 ml total output. Why the other options are incorrect: • 450 ml: 450 ml does not account for 100 ml of the total output. • 500 ml: 500 ml is 50 ml short, missing part of the vomit volume. • 600 ml: 600 ml includes an extra 50 ml that was not recorded. • 650 ml: 650 ml is 100 ml higher than the correct output figure.
Q24The prescribed infusion volume is 2100 ml to be administered over 21 hours. Calculate the required hourly flow rate.
✓ Correct answer: C. 100 ml/hr
Dividing 2100 ml by 21 hours gives a rate of 100 ml/hr. Why the other options are incorrect: • 90 ml/hr: At 90 ml/hr, only 1890 ml would be delivered across 21 hours, falling short of the required volume. • 95 ml/hr: Running at 95 ml/hr would yield 1995 ml, which does not reach the prescribed 2100 ml. • 105 ml/hr: 105 ml/hr would result in 2205 ml being infused, exceeding the prescribed volume. • 110 ml/hr: At 110 ml/hr, the total would reach 2310 ml, significantly more than required.
Q25A patient's output over a shift included 300 ml of urine, 150 ml of stool, and 50 ml of vomit. What is the total output?
✓ Correct answer: C. 500 ml
Total output: 300 + 150 + 50 = 500 ml. Why the other options are incorrect: • 450 ml: 450 ml is incorrect — this total is 50 ml lower than the correct figure. • 475 ml: 475 ml is incorrect — it underestimates the total by 25 ml. • 525 ml: 525 ml is incorrect — it adds 25 ml beyond the correct total. • 550 ml: 550 ml is incorrect — it is 50 ml above the actual output total.
Q26A neonate is to receive 40 mg of a drug available as a 20 mg/ml solution. What volume should be administered?
✓ Correct answer: B. 2 ml
40 mg divided by 20 mg/ml gives 2 ml, which contains the exact dose required for this neonate. Why the other options are incorrect: • 1 ml: 1 ml contains only 20 mg, providing just half the prescribed dose. • 3 ml: 3 ml contains 60 mg, which exceeds the required dose by 20 mg. • 4 ml: 4 ml contains 80 mg, double the neonate's prescribed dose. • 5 ml: 5 ml contains 100 mg, more than twice the required amount.
Q27You need to administer 600 ml of IV fluid over 6 hours. What flow rate should you set in ml per hour?
✓ Correct answer: C. 100 ml/hr
600 ml over 6 hours equals 100 ml/hr. Why the other options are incorrect: • 90 ml/hr: A rate of 90 ml/hr would only deliver 540 ml in 6 hours, which is insufficient. • 95 ml/hr: At 95 ml/hr, the infusion would total 570 ml, short of the required 600 ml. • 105 ml/hr: At 105 ml/hr, the patient would receive 630 ml, more than prescribed. • 110 ml/hr: A rate of 110 ml/hr would infuse 660 ml, exceeding the ordered volume.
Q28500 ml of IV fluid must be administered to a patient within 5 hours. What should the infusion rate be?
✓ Correct answer: C. 100 ml/hr
Dividing 500 ml by 5 hours gives 100 ml/hr. Why the other options are incorrect: • 90 ml/hr: 90 ml/hr would deliver only 450 ml in 5 hours, 50 ml short of the prescribed dose. • 95 ml/hr: 95 ml/hr totals 475 ml — still under the required 500 ml. • 105 ml/hr: 105 ml/hr delivers 525 ml, which exceeds the prescribed amount. • 110 ml/hr: 110 ml/hr infuses 550 ml, 50 ml more than was prescribed.
Q29The prescriber orders 500 ml of IV fluid to run over a 4-hour period. What infusion rate should be programmed?
✓ Correct answer: C. 120 ml/hr
500 ml divided by 4 hours equals 125 ml/hr. Why the other options are incorrect: • 100 ml/hr: At 100 ml/hr the infusion would take 5 hours to complete, not 4. • 110 ml/hr: 110 ml/hr delivers only 440 ml across 4 hours, short of the target volume. • 120 ml/hr: 120 ml/hr gives 480 ml in 4 hours, still 20 ml under what was prescribed. • 130 ml/hr: 130 ml/hr delivers 520 ml, which is more than the ordered amount.
Q30A patient produces 700 ml of urine and loses 300 ml through an IV site. What is the total output?
✓ Correct answer: C. 1000 ml
700 ml + 300 ml = 1000 ml total fluid output. Why the other options are incorrect: • 900 ml: 900 ml is 100 ml short of the correct total. • 950 ml: 950 ml understates the output by 50 ml. • 1050 ml: 1050 ml is 50 ml above the correct total. • 1100 ml: 1100 ml exceeds the correct output by 100 ml.
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