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All questions of Coding-Decoding for Class 8 Exam

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If GO = 32, SHE = 49, then SOME will be equal to
  • a)
    64
  • b)
    62
  • c)
    56
  • d)
    58
Correct answer is option 'C'. Can you explain this answer?

Rajat Menon answered
In the given code, Z = 1, Y = 2, X = 3, ……. C = 24, B = 25, Z = 26. 
So, GO = 20 + 12 = 32 and SHE = 8 + 19 + 22 = 49. 
Similarly, SOME = S + O + M + E = 8 + 12 + 14 + 22 = 56. 

In a certain code, VISHWANATHAN is written as NAAWTHHSANIV. How is KARUMAKARANA written in that code?
  • a)
    KAAMRAURMAAK
  • b)
    NKKRAMKRAUK
  • c)
    RURNKAAUNAK
  • d)
    AKNUARRAANKA
Correct answer is option 'A'. Can you explain this answer?

Subham Verma answered
Divide the given word into six sets of two letters each and label these sets from 1 to 6.
Then the code contains these sets in the order 4, 3, 5, 2, 6, 1 with the letters of sets 3, 2, 1 written in a reverse order. Thus, we have:

If NOIDA is written as 39658, how will INDIA be written?
  • a)
    36568
  • b)
    65368
  • c)
    63568
  • d)
    63569 
Correct answer is option 'C'. Can you explain this answer?

Charvi Pillai answered
Understanding the Code
To decode how NOIDA translates to 39658, we need to identify the numerical representation of each letter.
Letter to Number Mapping
- N = 3
- O = 9
- I = 6
- D = 5
- A = 8
Thus, NOIDA = N(3) + O(9) + I(6) + D(5) + A(8) = 39658.
Applying the Same Logic to INDIA
Now, let's apply the same letter-to-number mapping for the word "INDIA":
- I = 6
- N = 3
- D = 5
- I = 6
- A = 8
Constructing the Code for INDIA
So, combining these values, we get:
- I (6)
- N (3)
- D (5)
- I (6)
- A (8)
This results in the sequence: 63568.
Conclusion
Therefore, the code for INDIA is 63568, which corresponds to option 'C'.

In a certain code, RAIL is written as KCTN and SPEAK is written as CGRUM. How will AVOID be written in that code?
  • a)
    FKQXC
  • b)
    KQVCB
  • c)
    KQXCF
  • d)
    KRXCF 
Correct answer is option 'C'. Can you explain this answer?

Subham Verma answered
All the letters of the word, except the last letter, are written in the reverse order and in the group of letters so obtained each letter is moved into steps forward to get the code.
AVOID → IOVAD → KQXCF. 

If REQUEST is written as S2R52TU, then how will ACID be written?
  • a)
    ID3E
  • b)
    IC94
  • c)
    B3J4
  • d)
    1394 
Correct answer is option 'A'. Can you explain this answer?

Shilpa Dasgupta answered
Vowels A, E, I, O, U are coded as 1, 2, 3, 4, 5 respectively. Each of the consonants in the word is moved one step forward to give the corresponding letter of the code so, the code for ACID becomes ID3E. 

If code for 'TEAM' = 'MEAT', then code for 'HEAR' = '?'.
  • a)
    EHAR
  • b)
    REAH
  • c)
    RAEH
  • d)
    AERH
Correct answer is option 'B'. Can you explain this answer?

Torcia Education answered
Think of a 4-letter word as: 1st – 2nd – 3rd – 4th.
Rule: swap the 1st and 4th letters; keep the 2nd and 3rd the same.
TEAM → (swap T and M) → MEAT
HEAR → (swap H and R) → REAH ✅ (option b)

In a certain code language 'A' is coded as '5', 'B' is coded as '6', 'C' is coded as '7' and so on, then find the code of 'DDCE'.
  • a)
    7988
  • b)
    9788
  • c)
    8978
  • d)
    8879
Correct answer is option 'B'. Can you explain this answer?

Shiksha Academy answered
Following the pattern where each letter is represented by its position in the alphabet, 'D' corresponds to '4', 'E' corresponds to '5', so 'DDCE' translates to '4455' which is '9788'.

In a certain code language, ‘GRASP’ is ‘BMVNK' what will be the code for the word ‘CRANE’?
  • a)
    FUDQH
  • b)
    XMVIZ
  • c)
    GVERI
  • d)
    HWFSJ
Correct answer is option 'B'. Can you explain this answer?

Swara Chakraborty answered




Explanation:




- Given: GRASP is coded as BMVMK

- The letters in the word GRASP are shifted by a certain number of positions to get the coded word BMVMK.

- Let's find the shift by comparing the positions of letters in the original word and the coded word:

- G -> B (shift of 4 positions)

- R -> M (shift of 6 positions)

- A -> V (shift of 4 positions)

- S -> M (shift of 6 positions)

- P -> K (shift of 6 positions)

- So, the letters in the coded word are 4, 6, 4, 6, and 6 positions ahead of the corresponding letters in the original word.

- Applying the same shift to the word CRANE:

- C -> H (shift of 5 positions)

- R -> W (shift of 6 positions)

- A -> F (shift of 5 positions)

- N -> S (shift of 5 positions)

- E -> J (shift of 5 positions)

- Therefore, the word CRANE would be coded as HWFSJ.




Correct Answer: b) HWFSJ


If TRUTH is coded as SUQSTVSUGI, then the code for FALSE will be
  • a)
    FGZBKNRTDF
  • b)
    EGZBKMRDE
  • c)
    EGZKMRTDF
  • d)
    EGZBKMRTDF 
Correct answer is option 'D'. Can you explain this answer?

Rajveer Verma answered
Each letter of the word ‘TRUTH’ is replaced by a set of two letters – one preceding it and the other following it – in the code. Thus, T is replaced by SU, R is replaced by QS and so on. 

If ZIP = 198 and ZAP = 246, then how will you code VIP?
  • a)
    888
  • b)
    990
  • c)
    222
  • d)
    174
Correct answer is option 'C'. Can you explain this answer?

Sanskriti Tiwari answered
Taking Z = 2, Y = 3, …., N = 14, ……, B = 26, 
A = 27
ZIP
= (Z + I + P) × 6 = (2 + 19 + 12) × 6 = 33 × 6 
= 198 
VIP
= (V + I + P) × 6 = (6 + 19 + 12) × 6 = 37 × 6 
= 222  

If NARGRUED is the code for GRANDEUR, which word is coded as SERPEVRE?
  • a)
    PRESEVER
  • b)
    PERSERVE
  • c)
    PERSEVER
  • d)
    PRESERVE 
Correct answer is option 'D'. Can you explain this answer?

Maheshwar Kumar answered
The code has been obtained by writing the first four and the last four letters of the word in the reverse order. Thus, we have.
SERPEVRE → SERP/EVRE → PRES/ERVE → PRESERVE. 

If WORK is coded as 4 – 12 – 9 – 16, then how will you code WOMAN?
  • a)
    23 – 12 – 26 – 14 – 13
  • b)
    4 – 12 – 14 – 26 – 13
  • c)
    4 – 26 – 14 – 13 – 12
  • d)
    23 – 15 – 13 – 1 – 14 
Correct answer is option 'B'. Can you explain this answer?

Abhijeet Choudhary answered
Each letter is coded by the numeral obtained by subtracting from 27 then numeral denoting the position of the letter in the English alphabet. W, O, M, A, N are 23rd, 15th, 13th, 1st and 14th letters. So their codes are (27 – 23), (27 – 15), (27 – 13), (27 – 1), (27 – 14) 
i.e. 4, 12, 14, 26, 13 respectively. 

If MASTER is coded as , then POWDER will be coded as.
  • a)
  • b)
  • c)
  • d)
Correct answer is option 'B'. Can you explain this answer?

Athira Desai answered
Let A = 1, B = 2, C = 3, ……, Z = 26. Now, M = 13 = 4 (Remainder obtained after dividing by 9).
S = 19 = 1 (Remainder obtained after dividing by 9 twice)
T = 20 = 2 (Remainder obtained after dividing by 9 twice)
(Remainder obtained after dividing by 9)

If 'Sugar' is called 'Book', 'Book' is called 'Salt', and 'Salt' is called 'Sweet', what do we read?
  • a)
    Sugar
  • b)
    Sweet
  • c)
    Book
  • d)
    Salt
Correct answer is option 'A'. Can you explain this answer?

Learning Enablers answered
We are given:
  • 'Sugar' is called 'Book'
  • 'Book' is called 'Salt'
  • 'Salt' is called 'Sweet'
To understand what we read, let's break it down:
  • Normally, we read a book.
  • According to the coding, 'Book' is called 'Salt'.
  • 'Salt' is called 'Sweet'.
  • Since the question is asking what we typically read, it would be Sugar, as the word 'Sugar' has been substituted as 'Book' in the code.
Thus, the correct answer is Sugar.

If code of 'EF' is 'FG', then find the code of 'AB'.
  • a)
    DE
  • b)
    BA
  • c)
    CB
  • d)
    BC
Correct answer is option 'D'. Can you explain this answer?

Shiksha Academy answered
In the given pattern, each letter seems to be moving one step ahead. For instance, E becomes F and F becomes G. Following the same logic, A will become B and B will become C, resulting in the code 'BA'.

Chapter doubts & questions for Coding-Decoding - Science Olympiad Class 8 2026 is part of Class 8 exam preparation. The chapters have been prepared according to the Class 8 exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for Class 8 2026 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.

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