Coding Decoding Questions for SSC CHSL, Download Free PDF

SSC CHSL 2025 Tier 1 Exam is scheduled for November 12, 2025, and it’s time to strengthen your Reasoning section. It is one of the sections that can make or break your final score. Among all Reasoning topics, Coding-Decoding is one of the most frequent and scoring topics that can help you secure easy marks within seconds if you know the right approach. This topic checks your logical interpretation and pattern recognition skills, not lengthy calculations. You can expect 2–3 Coding-Decoding questions in the SSC CHSL Tier 1 exam, usually of easy to moderate difficulty. In this blog, we have provided free topic-wise practice tests, smart-solving strategies, and a free PDF of Coding-Decoding Questions for SSC CHSL.

What is Coding-Decoding in Reasoning?

Coding-Decoding questions test your ability to analyze patterns, symbol substitutions, or letter-number relationships used to code a word, number, or message.

Your task? Decode the pattern or rule and use it to find the correct code for another given word.

You can expect 2–3 such questions in the SSC CHSL Tier 1 Exam — and trust us, with practice, these are the fastest marks you can secure.

Common Types of Coding-Decoding Questions

1. Letter Coding
   Words are coded by replacing letters according to a pattern.
   • Example:
     If TABLE is coded as UCDNG, how is CHAIR coded?
     Each letter is shifted +2 in the alphabet.
     So, CHAIR → EJCKT.
2. Number Coding
   Words or alphabets are coded as numbers.
   • Example:
     If PEN = 35, INK = 32, then what is PAPER?
     You identify the number pattern (like sum of letters’ positions).
3. Substitution Coding
   Words or objects are replaced with other words.
   • Example:
     If ‘dog’ means ‘cat,’ and ‘cat’ means ‘rat,’ then what does ‘dog’ mean?
     → Answer: cat.
4. Symbol Coding
   Symbols or digits represent letters. You decode the logic based on clues.
   • Example:
     If A = @, B = #, C = %, then what is ABC?
     → @#%.
5. Mixed Coding / Mixed Letter Coding
   Codes for different words are mixed together, and you must compare multiple statements to find meanings.
   • Example:
     In a code language:
     “ram eats mango” → @ # $,
     “mango is sweet” → $ % &,
     Find the code for “is”.
     → “is” = % (common logic deduction).

Download Coding-Decoding Questions for SSC CHSL PDF for Free

Here, we have provided a PDF of Coding-Decoding Questions for SSC CHSL that you can download for free. Solving these questions will help you boost your reasoning preparation and know the types of questions asked in the exam. This PDF includes the latest pattern-based questions, detailed solutions, and smart-solving tricks to help you master this high-scoring topic.

Question 1: In a certain code language, ‘G’ is coded as ’28’ and ‘Q’ is coded as ’24’ then ‘MUD’ will be coded as ____ in the same code language.

A) 16, 12, 16

B) 8, 4, 16

C) 12, 4, 16

D) 24, 8, 4

Question 2: In a certain code language, ‘MAGNETIC’ is coded as ‘MFZLFUJD’, then ‘STRANGER’ will be coded as ____ in the same code language.

A) ZQSRMFDQ

B) ZQSROHFS

C) ZQSRQDFM

D) ZQSRMHVS

Question 3: In a certain code language, ‘W’ is coded as ’69’ and ‘S’ is coded as ‘171’ then ‘HAM’ will be coded as ____ in the same code language.

A) 16, 02, 26

B) 64, 01, 39

C) 16, 01, 39

D) 64, 02, 26

Question 4: In a certain code language, if TRILOGY is coded as 82 and PLIERS is coded as 65, then what is the code of word URGENT in the same coding language?

A) 57

B) 49

C) 59

D) 67

Question 5: If ‘RIGHTS’ is coded as ‘SKJLYY’, ‘HAMPER’ is coded as ‘ICPTJX’, then ‘UNITED’ is coded as ____.

A) VPLXJK

B) VPLXIJ

C) VPLXJJ

D) VOLXJJ

Question 6: In a certain code language, ‘red panda green grass’ is coded as ‘ab, ef, tu, lm’, ‘slithering red snake’ is coded as ‘qr, ab, st’ and ‘panda munching green’ is coded as ‘lm, pq, ef’, then what is the code for ‘snake munching grass’?

A) tu, qr, pq

B) qr, st, tu

C) pq, st, tu

D) Either option ‘a’ or option ‘c’

Question 7: In a certain code language, ‘CART’ is coded as ‘4 3 21 24’ and ‘TABLE’ is coded as ’21 3 5 16 10′. How will ‘ACTION’ be coded in that language?

A) 2 5 24 14 21 21

B) 8 5 24 14 21 21

C) 2 5 23 13 20 20

D) 15 7 8 14 19 19

Question 8: In a certain code language, ‘DIRECT’ is coded as ’25’ and ‘HOWLS’ is coded as ’50’. How will ‘BROAD’ be coded in that language?

A) 37

B) 32

C) 21

D) 54

Question 9: In a certain code language, ‘FAMILY’ is written as ‘BFINHD’. What will be the code for the ‘LOUNGE’ in the same language?

A) RTGHUJ

B) HTQSCJ

C) GTUION

D) IUPTBK

Question 10: 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

How to Solve Coding-Decoding Questions Effectively

To solve Coding-Decoding questions fast and accurately in the CHSL exam, follow this smart 3-step strategy.

Step 1: Identify the Type of Coding

Before solving, classify the question — is it letter-based, number-based, or mixed?
Once you identify the category, you’ll instantly know what to check for (position, difference, or replacement).

Step 2: Decode the Pattern

Now, find the hidden logic. Common tricks include:

• Alphabet Shifts: Each letter moves forward/backward by a fixed number.
  (CAT → DBU → shift +1)
• Reverse Order: Words are reversed before coding.
  (DOG → GOD → encoded pattern)
• Positional Values: Convert letters to numbers (A=1, B=2, … Z=26).
  Look for sums, differences, or specific arithmetic operations.
• Substitution Logic: Words are replaced with related terms or symbols.

Step 3: Verify the Rule and Apply

After identifying the pattern, apply it to the next word.
Always cross-check — if your decoded answer doesn’t fit the logic, revisit your pattern.

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