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All questions of Coding & Decoding for UPSC CSE Exam

If REQUEST is written as S2R52TU, how will ACID be written?

a) 1DBE             
b) 1DEB       
c) 1EDB                     
d) 1D3E     
Correct answer is option 'D'. Can you explain this answer?

Manoj Ghosh answered
Here we see, vowels A, E, I, 0, U are coded as 1, 2, 3, 4, 5 respectively,
Each of the consonants in the word REQUEST is moved one step forward to give the corresponding letter of the code. 
So, the code for ACID becomes 1D3E.

In a certain code language, ‘MOST’ is written as ‘134’ and ‘FUR’ is written as ‘90’. How will ‘SUCCESS’ be written in that language?
  • a)
    89
  • b)
    175
  • c)
    178
  • d)
    215
  • e)
    none of these
Correct answer is option 'C'. Can you explain this answer?

Telecom Tuners answered
To determine how 'SUCCESS' is written, let's analyze the coding pattern:

- MOST134
- M = 13
- O = 15
- S = 19
- T = 20
- Sum = 13 + 15 + 19 + 20 = 67
- Adding the digits of 67: 6 + 7 = 13 (1 + 3) = 4

- FUR90
- F = 6
- U = 21
- R = 18
- Sum = 6 + 21 + 18 = 45
- Adding the digits of 45: 4 + 5 = 9

Following the same pattern for SUCCESS:
- S = 19
- U = 21
- C = 3
- C = 3
- E = 5
- S = 19
- S = 19
- Sum = 19 + 21 + 3 + 3 + 5 + 19 + 19 = 89

Hence, ‘SUCCESS’ is written as 178 (1 + 7 + 8). Answer: C: 178

Directions: Study the following question carefully and choose the right answer.
In a certain code, LUTE is written as MUTE and GATE is written as HATE, then how BLUE will be written in that code?
  • a)
    FLUD
  • b)
    FLUEv
  • c)
    CLUE
  • d)
    GLUE
Correct answer is option 'C'. Can you explain this answer?

Muskaan Nair answered
Understanding the Code Transformation
To decode how LUTE is written as MUTE and GATE as HATE, we need to analyze the pattern in the letter transformations.
Identifying the Pattern
- In the word LUTE:
- The first letter 'L' is changed to 'M'.
- This indicates an increment of 1 position in the alphabet (L → M).
- In the word GATE:
- The first letter 'G' is changed to 'H'.
- Again, this shows an increment of 1 position (G → H).
Applying the Pattern to BLUE
Now, we apply the same transformation to the word BLUE.
- The first letter 'B':
- Increment by 1 position results in 'C' (B → C).
- The remaining letters (L, U, E) remain unchanged:
- L stays L
- U stays U
- E stays E
Thus, BLUE transforms to CLUE.
Conclusion
Therefore, in the given code, BLUE is written as CLUE, which corresponds to option 'C'. This consistent pattern of incrementing the first letter by one position while keeping the other letters intact confirms the transformation.

In a certain code language, ' first of all' is written as 'kan dan san', who is first' is written as 'zan kan ven', and 'this is pale' is written as 'ven gen len'. How will 'who' be written in that language?
  • a)
    zan
  • b)
    gen
  • c)
    kan
  • d)
    ven
  • e)
    none of these
Correct answer is option 'A'. Can you explain this answer?

Gate Funda answered
To determine how 'who' is written in the code language:

1. Identify common words and corresponding codes:
- 'first' = 'kan' (common in both 'first of all' and 'who is first')
- 'is' = 'ven' (common in 'who is first' and 'this is pale')

2. Compare phrases:
- 'first of all' = 'kan dan san'
- 'who is first' = 'zan kan ven'

The remaining code 'zan' must represent 'who'.

Therefore, 'who' is written as 'zan'.Clearly. a 'bag' is used to carry the books but a 'bag' is called 'dictionary'. So, a dictionary will be used to carry the books.
Hence, option A is correct.

Directions: Study the following question carefully and choose the right answer.
If CUSTOM is written as UCTSMO then how PARENT be written in the same code?
  • a)
    APERTN
  • b)
    RAPTNE
  • c)
    TNERAP
  • d)
    ERAPTN
Correct answer is option 'A'. Can you explain this answer?

Snehal Rane answered
Explanation:

Pattern in CUSTOM:
- In the word CUSTOM, each letter is shifted one position to the right.
- C becomes D, U becomes V, S becomes T, etc.
- Therefore, CUSTOM becomes UCTSMO.

Applying the same pattern to PARENT:
- P becomes Q, A becomes B, R becomes S, etc.
- So, PARENT will become APERTN.
Therefore, the correct answer is option A (APERTN).

Directions: Study the following question carefully and choose the right answer.
In a certain code ROAD is written as URDG. How is SWAN written in that code?
  • a)
    UXDQ
  • b)
    VZDQ
  • c)
    VXDQ
  • d)
    VZCQ
Correct answer is option 'B'. Can you explain this answer?

Muskaan Nair answered
Understanding the Code: ROAD to URDG
To decode how "ROAD" is transformed into "URDG", we need to analyze the shifts in each letter.
  • R (18) → U (21): Shift of +3
  • O (15) → R (18): Shift of +3
  • A (1) → D (4): Shift of +3
  • D (4) → G (7): Shift of +3

Each letter in "ROAD" is shifted forward by three positions in the alphabet to get "URDG".
Applying the Same Code to SWAN
Now, let's apply the same principle to the word "SWAN":
  • S (19) → V (22): Shift of +3
  • W (23) → Z (26): Shift of +3
  • A (1) → D (4): Shift of +3
  • N (14) → Q (17): Shift of +3

Thus, "SWAN" becomes "VZDQ".
Conclusion
Therefore, the code for "SWAN" is option 'B' - "VZDQ".

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