Coding Decoding Questions for Delhi Police Constable, Download Free PDF

While preparing for the Delhi Police Constable exam, you’ve probably noticed that General Intelligence & Reasoning is your highest-scoring section. If you have checked the syllabus, then you must have noticed that there is a topic named coding-decoding. If you have not covered that topic yet, then you are strongly advised to cover it because it is a high-scoring topic. You can expect at least 3 to 4 direct, simple, and fundamental questions on different types of codes. SSC asks these questions to check your ability to observe patterns and apply logic swiftly. In this blog, we’ve provided exam-level Coding-Decoding questions for the Delhi Police Constable exam in a free downloadable PDF. But before you download it, take some free Coding-Decoding tests to analyze your understanding of this topic.

Concept of Coding-Decoding for Delhi Police Constable

Coding-Decoding is all about hidden messages and secret rules! It tests your mental quickness to uncover the sequence used to convert a word or number into a code, and then apply that same rule to find the answer. The questions generally fall into three types:

• Letter Coding: Letters are shifted forward, backward, or interchanged (e.g., GO -> HP).
• Number/Symbol Coding: Words are represented by numbers or symbols (e.g., BAT -> 2120).
• Mixed/Conditional Coding: A list of words and their codes is given, and you must deduce the code for a specific word by comparison.

Key Scoring Sub-Topics You Must Cover in Coding-Decoding

If you want to boost your preparation for the Reasoning section of the Delhi Police Constable exam, you must master the fundamental patterns below. We’ve mentioned those topics as the most highly asked after an in-depth analysis of previous year question papers.

Topic Category	Essential Sub-Topics for Exam
Letter Shifting	Forward/Backward Shift: Patterns like +1, +2, -3, -1, or alternating shifts like +1, -1, +1.
Letter Position	Opposite Letters (V-M, I-R): Recognizing pairs that add up to 27 (A=1, Z=26).
Numeric Coding	Positional Value Sum: Sum of letters’ positions (A=1, B=2) or multiplying by a constant.
Cross/Zig-Zag Pattern	Letters are shifted forward or backward, but the positions are swapped (e.g., ABCD -> CDAB).
Mixed/Substitution	Identifying the common word or common letter/number in two different codes to find the core rule.

Coding Decoding Questions for Delhi Police Constable PDF, Download for Free

The questions asked by SSC from the Reasoning section in the Delhi Police Constable exam are typically direct, pattern-based facts. SSC asks these questions to test your observation skills and ability to recall positional values quickly. They are the perfect type of question that can save you time for other time-consuming sections. To help you master these quick facts, we have provided a PDF that consists of the most important and frequently asked Coding-Decoding questions for the exam. Click on the button given below to download the Coding Decoding Questions for Delhi Police Constable PDF for free.

Click to Download Delhi Police Constable Coding Decoding Questions for Free

Question 1: In a certain code language, ‘LAMB’ is written as ‘PAQF’. What will be the code for ‘HUSK’ in that language?

A) LIGO

B) JIHF

C) LUWO

D) JTRF

Solution 1: 3)

The logic followed here is as follows,

Replace each consonant by fourth succeeding letter in the English alphabetical series. No change is done to the vowel.

For LAMB,

L	A	M	B
P	A	Q	F

For HUSK,

H	U	S	K
L	U	W	O

Hence, option c.

Question 2: Select the option in which the numbers are not related in the same way as are the number of the following set.
(18, 23, 123)
A) (17, 15, 96)
B) (12, 24, 108)
C) (16, 22, 115)
D) (19, 23, 126)

Solution 2:
The logic followed here is given below:
1st number is added to 2nd number and then resultant number is multiplied by 3 to get the 3rd number.
In (18, 23, 123)
[18 + 23] × 3
= 41 × 3
= 123

In option ‘a’, (17, 15, 96)
[17 + 15] × 3
= 32 × 3
= 96

In option ‘b’, (12, 24, 108)
[12 + 24] × 3
= 36 × 3
= 108

In option ‘d’, (19, 23, 126)
[19 + 23] × 3
= 42 × 3
= 126

All combination of numbers follows this pattern except for,
In option ‘c’, (16, 22, 115)
[16 + 22] × 3
= 38 × 3
= 114 ≠ 115
Hence, option c.

Question 3: Four words have been given out of which three are alike in some manner, while one is different. Choose the odd one.
A) Rajkot
B) Bhubaneswar
C) Port Blair
D) Jaipur

Solution 3:
All cities are capitals of an Indian state except for ‘Rajkot’.
Hence, option a.

Question 4: Three of the following words are alike in some manner and hence form a group. Which word does NOT belong to that group? (The words must be considered as meaningful English words and must not be grouped based on the number of letters/number of consonants/vowels in the word).
A) Nepal
B) Pakistan
C) China
D) Sri Lanka

Solution 4:
‘India’ shares its land border with Nepal, Pakistan and China except with Sri Lanka.
Hence, option d.

Question 5: Four number-pairs have been given, out of which three are alike in some manner and one is different. Select the number-pair that is different.
A) 18 – 29
B) 26 – 40
C) 52 – 80
D) 94 – 143

Solution 5:
The logic followed here is:
The second number is sum of 1.5 times of the first number and 2.

In option ‘A’, 18 – 29,
29 = 18 × 1.5 + 2
29 = 27 + 2
29 = 29

In option ‘B’, 26 – 40,
40 = 26 × 1.5 + 2
40 = 39 + 2
40 ≠ 41

In option ‘C’, 52 – 80,
80 = 52 × 1.5 + 2
80 = 78 + 2
80 = 80

In option ‘D’, 94 – 143,
143 = 94 × 1.5 + 2
143 = 141 + 2
143 = 143

Hence, option b.

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Preparation Tips for Delhi Police Constable Coding-Decoding

Solving coding-decoding questions is not time-consuming if you know the right approach to solve them. Below, we have mentioned some tips that will help you maximize your problem-solving skills for this topic:

1. Memorize the Table: The single most important tool is the Alphabet Position Table (A=1, Z=26) and the Opposite Letter Table (A-Z, B-Y, etc.). You are advised to practice them, saying them out loud until you aren’t able to remember them in a flow.
2. Calculate the Difference First: For letter series, always write the numerical positions below the coded letters (e.g., B (2) -> D (4)). The pattern (+2) will immediately become clear.
3. Start with the Easiest Letter: When solving a coding-decoding question, don’t worry about the first or last letter. Start with the letter that has the clearest or most unique shift to find the rule faster.
4. Practice High Volume: Coding-Decoding requires a lot of practice. Solve at least 20-30 questions daily. For that, you can use our free topic tests to improve your speed and pattern recognition.
5. Look for Cross Patterns: If simple shifting doesn’t work, check if the letters of the word have been divided into two halves and then crossed or reversed (e.g., MASTER -> SAMRET).

Also Read:

• Delhi Police Constable Cut Off
• Delhi Police Constable Syllabus
• Delhi Police Constable Notification 2025

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