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Delhi Police Constable Series Questions with Answers & Explanations

20 Series questions from the Reasoning section of Delhi Police Constable, each with the correct answer and a worked explanation. Try each question first, then tap Show answer to check. When you're ready, take the timed chapter-wise test to see your all-India rank.

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Question 1

What comes next in the series? 27, 64, 125, 216, 343, ?

  1. A506
  2. B512
  3. C517
  4. D507
Show answer
Answer: (B) 512 The terms are consecutive perfect cubes.
Question 2

What comes next in the series? G, J, M, P, ?

  1. AR
  2. BS
  3. CU
  4. DT
Show answer
Answer: (B) S Each letter moves 3 places forward in the alphabet.
Question 3

What comes next in the series? 12, 19, 26, 33, 40, ?

  1. A47
  2. B48
  3. C42
  4. D44
Show answer
Answer: (A) 47 Each term increases by 7.
Question 4

What comes next in the series? H, J, L, N, ?

  1. AO
  2. BR
  3. CP
  4. DQ
Show answer
Answer: (C) P Each letter moves 2 places forward in the alphabet.
Question 5

What comes next in the series? 64, 125, 216, 343, 512, ?

  1. A729
  2. B719
  3. C731
  4. D724
Show answer
Answer: (A) 729 The terms are consecutive perfect cubes.
Question 6

What comes next in the series? F, H, J, L, ?

  1. AN
  2. BM
  3. CO
  4. DP
Show answer
Answer: (A) N Each letter moves 2 places forward in the alphabet.
Question 7

What comes next in the series? 15, 45, 135, 405, 1215, ?

  1. A3651
  2. B3635
  3. C3645
  4. D3642
Show answer
Answer: (C) 3645 Each term is multiplied by 3.
Question 8

What comes next in the series? 5, 10, 15, 20, 25, ?

  1. A35
  2. B29
  3. C30
  4. D33
Show answer
Answer: (C) 30 Each term increases by 5.
Question 9

What comes next in the series? 6, 12, 21, 27, 36, ?

  1. A42
  2. B40
  3. C36
  4. D45
Show answer
Answer: (A) 42 The differences alternate between +6 and +9.
Question 10

What comes next in the series? C, G, K, O, ?

  1. AR
  2. BT
  3. CS
  4. DU
Show answer
Answer: (C) S Each letter moves 4 places forward in the alphabet.

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Question 11

What comes next in the series? 9, 16, 25, 36, 49, ?

  1. A65
  2. B54
  3. C64
  4. D66
Show answer
Answer: (C) 64 The terms are consecutive perfect squares.
Question 12

What comes next in the series? D, F, H, J, ?

  1. AN
  2. BM
  3. CK
  4. DL
Show answer
Answer: (D) L Each letter moves 2 places forward in the alphabet.
Question 13

What comes next in the series? 8, 13, 18, 23, 28, ?

  1. A27
  2. B28
  3. C32
  4. D33
Show answer
Answer: (D) 33 Each term increases by 5.
Question 14

What comes next in the series? A, C, E, G, ?

  1. AJ
  2. BH
  3. CK
  4. DI
Show answer
Answer: (D) I Each letter moves 2 places forward in the alphabet.
Question 15

What comes next in the series? 14, 29, 59, 119, 239, ?

  1. A473
  2. B485
  3. C479
  4. D484
Show answer
Answer: (C) 479 Each term is (previous × 2) + 1.
Question 16

What comes next in the series? C, F, I, L, ?

  1. AO
  2. BP
  3. CN
  4. DQ
Show answer
Answer: (A) O Each letter moves 3 places forward in the alphabet.
Question 17

What comes next in the series? 13, 27, 55, 111, 223, ?

  1. A447
  2. B450
  3. C448
  4. D444
Show answer
Answer: (A) 447 Each term is (previous × 2) + 1.
Question 18

What comes next in the series? 2, 4, 8, 16, 32, ?

  1. A59
  2. B74
  3. C70
  4. D64
Show answer
Answer: (D) 64 Each term is multiplied by 2.
Question 19

What comes next in the series? G, K, O, S, ?

  1. AV
  2. BX
  3. CW
  4. DY
Show answer
Answer: (C) W Each letter moves 4 places forward in the alphabet.
Question 20

What comes next in the series? 15, 31, 63, 127, 255, ?

  1. A517
  2. B511
  3. C514
  4. D509
Show answer
Answer: (B) 511 Each term is (previous × 2) + 1.

These are RankerClub practice questions written in the Delhi Police Constable pattern. They are not official SSC/IBPS/RRB papers.

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