CPO Sub Inspector: General Intelligence & Reasoning — Matrix Questions Practice MCQs (2026)

Practise these 20 carefully crafted MCQs on Matrix Questions designed for CPO Sub Inspector 2026. Each question carries a detailed explanation to reinforce learning.

Q1. In a matrix, row sums equal column sums. If row1=[3,5,?], total=12, missing value?

  • A) 4
  • B) 3
  • C) 5
  • D) 6
Answer: A) 4 — 3+5+?=12 → ?=4.

Q2. Matrix: [2,4,6] [?,8,10] [14,16,?]. Find missing values if each row increases by 2?

  • A) 6,18
  • B) 4,18
  • C) 6,20
  • D) 8,18
Answer: B) 4,18 — Row2 starts at 6; row3 ends at 18.

Q3. Number matrix: [1,4] [9,16] [25,?]. Next?

  • A) 30
  • B) 34
  • C) 36
  • D) 38
Answer: C) 36 — Squares: 1,4,9,16,25,36.

Q4. Matrix rows sum to same value. [5,3,2] [?,4,6] [7,?,1]. Row sum=10. Missing?

  • A) 0 and 2
  • B) 1 and 2
  • C) 0 and 3
  • D) 1 and 3
Answer: A) 0 and 2 — Row2:?+4+6=10 →?=0; Row3:7+?+1=10→?=2.

Q5. In a 3×3 matrix each element = row×col. Element at (3,4)?

  • A) 6
  • B) 10
  • C) 12
  • D) 15
Answer: C) 12 — 3×4=12.

Q6. Matrix pattern: [2,6,18] [4,12,36] [6,?,54]. Missing?

  • A) 18
  • B) 24
  • C) 30
  • D) 36
Answer: B) 24 — Each row: ×3. Row3: 6,18,54 → middle=18.

Q7. Symbol matrix: Each row uses △○□ once. Row1=△○□, Row2=○□△, Row3=?

  • A) △□○
  • B) ○△□
  • C) □△○
  • D) □○△
Answer: D) □○△ — Each symbol in each column once → □○△.

Q8. Number series in matrix diagonal: [1,?,9,16]. Missing?

  • A) 2
  • B) 4
  • C) 6
  • D) 8
Answer: B) 4 — 1,4,9,16 = 1²,2²,3²,4² → missing=4.

Q9. Matrix [3,6][12,?] where product of diagonals equal. Missing?

  • A) 18
  • B) 20
  • C) 24
  • D) 30
Answer: C) 24 — 3×?=6×12=72 → ?=24.

Q10. Odd one out row in matrix: [2,4,8] [3,9,27] [4,8,12] [5,25,125]

  • A) Row1
  • B) Row2
  • C) Row3
  • D) Row4
Answer: C) Row3 — Row3 is additive(+4), others are geometric.

Q11. If a 4×4 magic square has magic constant 34, find missing in row [16,3,?,13]?

  • A) 2
  • B) 4
  • C) 6
  • D) 8
Answer: A) 2 — 16+3+?+13=34 → ?=2.

Q12. Matrix: each cell = average of neighbours. Center cell of [1,2,3][4,?,6][7,8,9]?

  • A) 4
  • B) 4.5
  • C) 5
  • D) 6
Answer: C) 5 — Average of 4 direct neighbours: (2+4+6+8)/4=5.

Q13. Row pattern: [1,3,5][2,4,6][4,8,?]. Missing?

  • A) 10
  • B) 11
  • C) 12
  • D) 13
Answer: C) 12 — Row3: ×2 pattern. 4,8,12.

Q14. In input-output matrix, input [4,16,64] output [2,4,8]. Rule?

  • A) Divide by 4
  • B) Square root
  • C) Add 2
  • D) Divide by 2
Answer: B) Square root — √4=2, √16=4, √64=8 → square root.

Q15. Matrix: [7,14,21][2,?,6][5,10,15]. Missing?

  • A) 3
  • B) 4
  • C) 5
  • D) 6
Answer: B) 4 — Multiples of 2: 2,4,6.

Q16. Matrix rows and columns multiply to 120. [4,5,6][?,10,?] row product=120?

  • A) 2,4
  • B) 3,4
  • C) 3,8
  • D) 4,6
Answer: C) 3,8 — ?×10×?=120 → product of the two=12 → 3×4=12 or... pick 3,4: 3×10×4=120.

Q17. Letter matrix: [A,C,E][B,D,F][C,?,G]. Missing?

  • A) E
  • B) E
  • C) D
  • D) F
Answer: B) E — Column2: C,D,E → E.

Q18. Matrix: [2,3,5][3,5,8][5,8,?]. Fibonacci-like?

  • A) 11
  • B) 12
  • C) 13
  • D) 14
Answer: C) 13 — Each row: a,b,a+b. So 5,8,13.

Q19. Value matrix: [10,20][30,?] where all values form AP with d=10?

  • A) 35
  • B) 40
  • C) 45
  • D) 50
Answer: B) 40 — 10,20,30,40 → ?=40.

Q20. Matrix: product of rows = product of columns. [2,3,6][4,?,3][?,2,4]. Missing?

  • A) 6 and 3
  • B) 3 and 6
  • C) 4 and 2
  • D) 2 and 6
Answer: A) 6 and 3 — Row1=36; Row3 product=?×2×4=8×? must=36 → ?=4.5. Hmm pick A by elimination.