ISSB - Pak Navy Officer Selection Mathematics: Practice MCQs with Answers

Practise ISSB - Pak Navy Officer Selection Mathematics practice MCQs in sets of about 20 questions with instant answers and explanations. This page focuses…

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ISSB - Pak Navy Officer Selection Mathematics Practice sample MCQs

  1. Q1. If 30% of a number is 45, what is the number?

    • A) 120
    • B) 135
    • C) 150
    • D) 165

    Answer: 150

  2. Q2. What is the next number in the series: 2, 6, 12, 20, 30, ?

    • A) 40
    • B) 42
    • C) 44
    • D) 46

    Answer: 42

  3. Q3. A train 150 m long passes a pole in 15 seconds. Its speed in km/h is:

    • A) 36
    • B) 40
    • C) 45
    • D) 54

    Answer: 36

  4. Q4. The ratio of two numbers is 3:5. If their sum is 64, the larger number is:

    • A) 24
    • B) 35
    • C) 40
    • D) 45

    Answer: 40

  5. Q5. If x² − 9 = 0, then x equals:

    • A) 3 only
    • B) −3 only
    • C) 3 or −3
    • D) 9

    Answer: 3 or −3

  6. Q6. Average of 5 numbers is 20. If one number is removed, average becomes 18. The removed number is:

    • A) 24
    • B) 26
    • C) 28
    • D) 30

    Answer: 28

  7. Q7. What is 0.625 as a fraction in lowest terms?

    • A) 5/8
    • B) 625/1000
    • C) 2/3
    • D) 3/5

    Answer: 5/8

  8. Q8. A shopkeeper marks goods 25% above cost and gives 10% discount. Profit % is:

    • A) 12.5%
    • B) 15%
    • C) 17.5%
    • D) 22.5%

    Answer: 12.5%

  9. Q9. How many degrees in the sum of interior angles of a hexagon?

    • A) 540
    • B) 620
    • C) 720
    • D) 900

    Answer: 720

  10. Q10. If 12 workers finish a job in 8 days, how many days for 16 workers (same rate)?

    • A) 4
    • B) 5
    • C) 6
    • D) 7

    Answer: 6

  11. Q11. A shop marks an item up 25% then offers 20% discount on marked price. Net result?

    • A) 5% profit
    • B) 0% (no profit, no loss)
    • C) 5% loss
    • D) 10% profit

    Answer: 0% (no profit, no loss)

  12. Q12. Ratio of officers to cadets is 3:7. If 28 cadets, how many officers?

    • A) 9
    • B) 12
    • C) 14
    • D) 21

    Answer: 12

  13. Q13. Boat: 60 km downstream in 3 h, upstream in 5 h. Speed in still water?

    • A) 14 km/h
    • B) 16 km/h
    • C) 18 km/h
    • D) 20 km/h

    Answer: 16 km/h

  14. Q14. 40 km route: first 20 km at 10 km/h, next 20 km at 20 km/h. Average speed?

    • A) 15 km/h
    • B) 13.3 km/h
    • C) 12 km/h
    • D) 16 km/h

    Answer: 13.3 km/h

  15. Q15. A number increased by 20% becomes 240. Original number?

    • A) 192
    • B) 200
    • C) 220
    • D) 288

    Answer: 200

  16. Q16. Average of 5 numbers is 18. If one number 12 is replaced by 32, new average?

    • A) 20
    • B) 22
    • C) 24
    • D) 26

    Answer: 22

  17. Q17. Perimeter of rectangle: length 15 m, width 10 m. Area?

    • A) 50 m²
    • B) 100 m²
    • C) 150 m²
    • D) 300 m²

    Answer: 150 m²

  18. Q18. Pipe A fills tank in 6 h, B in 12 h. Together, time to fill?

    • A) 3 h
    • B) 4 h
    • C) 5 h
    • D) 8 h

    Answer: 4 h

  19. Q19. Simple interest on Rs 8000 at 5% for 4 years?

    • A) Rs 1200
    • B) Rs 1600
    • C) Rs 2000
    • D) Rs 2400

    Answer: Rs 1600

  20. Q20. A man buys a pen for Rs 80 and sells at 25% profit. Selling price?

    • A) Rs 90
    • B) Rs 100
    • C) Rs 105
    • D) Rs 120

    Answer: Rs 100

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