Revise General Mental Ability for CAPF AC 2025 with this quick guide. Includes solved Practice Set 7 with answer key for last-minute preparation
Practice Set -7
General Mental Ability
1. What comes next in the series: 2, 4, 8, 16, ?
(A) 18 (B) 24 (C) 32 (D) 64
2. A man is 24 years older than his son. In two years, his age will be twice that of his son. What is the son’s current age?
(A) 20 (B) 22 (C) 24 (D) 26
3. If in a code, CAT = XZG, what is DOG in the same code?
(A) WLT (B) WLT (C) WRL (D) WLO
4. Which number is the odd one out: 3, 5, 11, 14, 17, 21, 23?
(A) 14 (B) 17 (C) 21 (D) 23
5. Which word cannot be formed from DEMOCRATIC?
(A) CRATE (B) COMET (C) MOTE (D) DOME
6. If 3x – 5 = 16, what is x?
(A) 5 (B) 6 (C) 7 (D) 8
7. A is taller than B but shorter than C. D is shorter than B. Who is the tallest?
(A) A (B) B (C) C (D) D
8. Find the missing number: 5, 11, 17, ?, 29
(A) 22 (B) 23 (C) 24 (D) 25
9. If a clock is 15 minutes slow at 9 AM and gains 2 minutes every hour, what time will it show at 9 PM?
(A) 9:00 PM (B) 9:05 PM (C) 9:09 PM (D) 9:15 PM
10. What is the angle between the hour and minute hand at 3:15?
(A) 0° (B) 7.5° (C) 30° (D) 45°
11. In a certain code, MANGO is written as NZOPH. How is APPLE written in that code?
(A) BQQMF (B) BQQMG (C) BPPMG (D) CQQMF
12. If 5x = 2x + 21, then x = ?
(A) 7 (B) 6 (C) 5 (D) 8
13. If ‘PENCIL’ is coded as 741239 and ‘ERASER’ as 534564, then how is ‘NICE’ coded?
(A) 1234 (B) 1432 (C) 4312 (D) 3412
14. If 6 men can complete a work in 10 days, how many men are needed to complete the same work in 5 days?
(A) 6 (B) 10 (C) 12 (D) 3
15. Which number completes the pattern: 1, 4, 9, 16, ?, 36
(A) 20 (B) 24 (C) 25 (D) 30
16. If 9x = 81, then x = ?
(A) 8 (B) 7 (C) 9 (D) 6
17. Pointing to a photograph, a man said, “I have no brothers or sisters, but that man’s father is my father’s son.” Who is the man in the photo?
(A) Son (B) Father (C) Uncle (D) Cousin
18. Find the odd one out: 2, 6, 12, 20, 30, 42, 56
(A) 6 (B) 12 (C) 30 (D) 56
19. A train 100 meters long is moving at 50 m/s. How much time will it take to pass a man standing still?
(A) 1 sec (B) 2 sec (C) 3 sec (D) 4 sec
20. If 15% of a number is 90, what is the number?
(A) 500 (B) 600 (C) 700 (D) 750
21. If 2 + 3 = 13, 3 + 4 = 25, 4 + 5 = 41, then 5 + 6 = ?
(A) 61 (B) 71 (C) 81 (D) 91
22. In a certain language, if TREE is coded as USFF, then LEAF is coded as:
(A) MFBG (B) MEBG (C) MDFG (D) MDBG
23. Find the next term: AB, DE, GH, ?
(A) JK (B) IJ (C) KL (D) LM
24. If a × b means a is the brother of b, a + b means a is the mother of b, then what does P + R × T mean?
(A) P is the mother of T (B) P is the mother of R (C) T is the brother of P (D) R is the son of P
25. Which number is missing?
3, 6, 18, 72, ?
(A) 144 (B) 216 (C) 288 (D) 360
26. Which number is missing:
11, 13, 17, 19, 23, ?
(A) 25 (B) 27 (C) 29 (D) 31
27. If √x = 7, what is x?
(A) 14 (B) 49 (C) 77 (D) 64
28. Find the odd word:
Cat, Dog, Cow, Lion, Hen
(A) Dog (B) Cow (C) Hen (D) Lion
29. In a certain code, ROSE is written as 6821, and LOVE is written as 9131. What is the code for OVER?
(A) 3186 (B) 3182 (C) 3126 (D) 3916
30. What will be the average of first 5 odd numbers?
(A) 5 (B) 6 (C) 7 (D) 8
31. A person walks 10 meters North, then turns right and walks 10 meters. He again turns right and walks 10 meters. In which direction is he from the starting point?
(A) South (B) North (C) West (D) East
32. How many squares are there in a 3×3 grid?
(A) 9 (B) 14 (C) 15 (D) 16
33. If a = 2, b = 4, c = 6,… then what is the value of z?
(A) 50 (B) 48 (C) 52 (D) 54
34. What is 10% of 250 + 5% of 100?
(A) 30 (B) 25 (C) 20 (D) 35
35. What comes next: 6, 11, 21, 36, ?
(A) 52 (B) 56 (C) 60 (D) 66
36. Find the missing letter: C, E, H, L, Q, ?
(A) R (B) S (C) W (D) Z
37. Choose the correct water image of the word “POT”.
(A) Horizontal mirror image (B) Vertical mirror image
(C) Water image flips vertically (D) Diagonal image
38. What will come next in the pattern: A1, B2, C3, D4, ?
(A) E5 (B) F5 (C) E4 (D) D5
39. Which is different?
(A) Circle (B) Square (C) Rectangle (D) Cube
40. 2, 3, 5, 8, 12, ?, 23
(A) 15 (B) 16 (C) 17 (D) 18
41. A cube has how many edges?
(A) 6 (B) 8 (C) 12 (D) 16
42. If 6 pencils cost ₹18, what is the cost of 10 pencils?
(A) ₹30 (B) ₹36 (C) ₹24 (D) ₹28
43. If in a certain code, RAM = 27, SHYAM = ?
(A) 58 (B) 65 (C) 60 (D) 66
44. If A = 1, Z = 26, what is the value of AZ?
(A) 27 (B) 28 (C) 25 (D) 26
45. Choose the related pair: Book : Reading :: Pen : ?
(A) Ink (B) Writing (C) Paper (D) Drawing
46. A, B, and C can complete a work in 12, 15, and 20 days respectively. Working together, how many days will they take?
(A) 5 (B) 6 (C) 7 (D) 8
47. A clock shows 2:45. What is the angle between the hands?
(A) 112.5° (B) 90° (C) 135° (D) 120°
48. How many diagonals does a hexagon have?
(A) 6 (B) 8 (C) 9 (D) 15
49. A cone has how many faces?
(A) 1 (B) 2 (C) 3 (D) 4
50. Which number is a multiple of both 3 and 5?
(A) 10 (B) 15 (C) 18 (D) 20
Answer Key : Practice Set -7
1. (C) 32
2 × 2 = 4, 4 × 2 = 8…
2. (A) 20
Let son’s age = x, father’s = x+24.
(x + 2) × 2 = x + 24 + 2 → 2x + 4 = x + 26 → x = 20
3. (C) WRL
Reverse alphabet coding: C (3rd from A) → X (3rd from Z), A → Z, T → G
4. (C) 21
All are primes except 21.
5. (B) COMET
No ‘T’ and ‘E’ together twice in DEMOCRATIC.
6. (C) 7
3x – 5 = 16 → 3x = 21 → x = 7
7. (C) C
C > A > B > D
8. (B) 23
Difference of 6; 5→11 (+6), 11→17 (+6), 17→23 (+6)
9. (C) 9:09 PM
Gains 2 min/hr → 12 hours = 24 min gain; was 15 min slow → net +9 mins
10. (B) 7.5°
At 3:15, angle = |(30×3 + 0.5×15) – (6×15)| = |97.5 – 90| = 7.5°
11. (A) BQQMF
Each letter is +1 from previous: M→N, A→B, N→O…
12. (A) 7
5x = 2x + 21 → 3x = 21 → x = 7
13. (D) 3412
N-I-C-E = 1-2-3-4 as per the given codes.
14. (C) 12
More men → less time. 6 men × 10 days = 60 man-days → 60/5 = 12
15. (C) 25
Squares of natural numbers: 1², 2², 3², …
16. (C) 9
9x = 81 → x = 9
17. (A) Son
“That man’s father is my father’s son” → “my son”
18. (C) 30
2²=4, 3²=9, 4²=16,… add square +1
19. (B) 2 sec
Speed = 50 m/s; Length = 100 m → Time = 100/50 = 2s
20. (B) 600
15% of x = 90 → x = (90×100)/15 = 600
21. (A) 61
Pattern: a + b + (a×b) → 5+6+30=41
22. (A) MFBG
T+1=U, R+1=S,…
23. (A) JK
AB(+3)DE(+3)GH(+3)JK
24. (B) P is mother of R_
25. (B) 216
3×2=6, 6×3=18, 18×4=72, 72×3=216
26. (C) 29
Next prime after 23 = 29
27. (B) 49
√x = 7 → x = 49
28. (D) Lion
All are domestic animals except lion
29. (A) 3186
O-V-E-R → 9-1-3-6
30. (A) 5
(1+3+5+7+9)/5 = 25/5 = 5
31. (D) East
10N → 10E → 10S → ends 10E from start
32. (C) 14
(3×3) = 9 (1×1 squares), 4 (2×2), 1 (3×3) → 9+4+1=14
33. (A) 50
a=2, b=4,… z = 2×26 = 52
34. (A) 30
10% of 250 = 25, 5% of 100 = 5 → total = 30
35. (A) 52
Difference: +5, +10, +15,… next +16 = 52
36. (C) W
Difference: +2, +3, +4… last = Q(+5)=W
37. (C) Water image flips vertically_
38. (A) E5
Alphabet+Number: increasing
39. (D) Cube
All others are 2D shapes
40. (B) 16
Diff: +1, +2, +3,… so next is +4 = 16
41. (C) 12
Cube has 12 edges
42. (A) ₹30
6 pencils = ₹18 → 1 = ₹3 → 10 = ₹30
43. (C) 60
R=18, A=1, M=13 = 32. SHYAM = 19+8+25+1+13=66
44. (A) 27
A=1, Z=26 → 1+26 = 27
45. (B) Writing
Book → Reading :: Pen → Writing
46. (B) 6
1/12 + 1/15 + 1/20 = 1/5 → Time = 5 days
47. (A) 112.5°
Formula: |(30×H – 5.5×M)| = |(30×2 – 5.5×45)| = 112.5°
48. (C) 9
Diagonals = n(n–3)/2 = 6(3)/2 = 9
49. (B) 2
Cone has 1 curved and 1 circular base face = 2
50. (B) 15
Only 15 is divisible by both 3 & 5
