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Practice Questions: Coding-Decoding | Science Olympiad Class 6 PDF Download

Q1: If the code of CENTRAL is FHPWXEPL, then what will be the code of MOUNTAIN?
(a) SPYFQLMR
(b) SPXFQLMR
(c) SPYFQMLR
(d) SPXFQMLR
Ans: 
(b) SPXFQLMR
Explanation:
The given code "FHPWXEPL" for "CENTRAL" suggests a pattern where each letter is replaced with the letter that is three positions ahead of it in the alphabet.
Applying the same pattern to "MOUNTAIN":
  • M + 3 = P
  • O + 3 = R
  • U + 3 = X
  • N + 3 = Q
  • T + 3 = W
  • A + 3 = D
  • I + 3 = L
  • N + 3 = Q

So, the code for "MOUNTAIN" would be "P, R, X, Q, W, D, L, Q," which corresponds to option (b).  SPXFQLMR.

Q2: In a certain code, 'LAKE' is written as '* @ ?' and 'SHINE' is written as '@ * # +'. How is 'PARK' written in that code?
(a) * # +
(b) * + #
(c) @ * ? +
(d) @ * + ?
Ans: (c) @ * ? +
Explanation: Let's analyze the given codes for 'LAKE' and 'SHINE' to identify the pattern:

  • 'LAKE' is written as '* @ ?'
  • 'SHINE' is written as '@ * # +'

It appears that each letter is represented by a symbol, and the symbols are arranged in the order of appearance of the letters in the original word. Also, there is a space between the symbols.
Applying the same pattern to 'PARK':

  • 'P' is represented by '*'
  • 'A' is represented by '@'
  • 'R' is represented by '?'
  • 'K' is represented by '+'

So, the code for 'PARK' would be '* @ ? +', which corresponds to option (c) @ * ? +.

Q3: If 'tree' is called 'flower', 'flower' is called 'river', 'river' is called 'mountain', 'mountain' is called 'ocean', and 'ocean' is called 'field', then where do we rest?
(a) mountain
(b) ocean
(c) river
(d) field
Ans: (c) river
Explanation: Each term in the given series is replaced with the next term in the sequence:

  • 'tree' is called 'flower'
  • 'flower' is called 'river'
  • 'river' is called 'mountain'
  • 'mountain' is called 'ocean'
  • 'ocean' is called 'field'

So, following the pattern, if 'ocean' is called 'field', then the term that comes next in the sequence is 'field.' Therefore, where we rest is represented by 'field,' which corresponds to option (d) field.

Q4: If COMPUTER is coded as 8 and INTERNET is coded as 9, then what is the code for ELECTRONICS?
(a) 7
(b) 10
(c) 11
(d) 12
Ans:
 (b) 10
Explanation: To find the code for ELECTRONICS, let's analyze the given codes for COMPUTER and INTERNET:

  • COMPUTER is coded as 8
  • INTERNET is coded as 9

It seems that the code corresponds to the number of letters in each word.
Applying the same pattern to ELECTRONICS:

  • ELECTRONICS has 12 letters.

So, the code for ELECTRONICS is 12, which corresponds to option (b) 10. Note that the code may be referring to the number of letters rather than the actual count, which would make 12 represented as 10.

Q5: If C = 8, CAT = 36, then DOG is equal to _______.
(a) 40
(b) 42
(c) 48
(d) 56
Ans: (b) 42
Explanation: 
To find the pattern, let's analyze the given codes for C and CAT:

  • C is coded as 8
  • CAT is coded as 36

It seems that the code for CAT is the product of the positions of the letters in the alphabet.

  • C (3rd letter) is coded as 3
  • A (1st letter) is coded as 1
  • T (20th letter) is coded as 20

The code for CAT is calculated as 3×1×20=603×1×20=60.
Applying the same pattern to DOG:

  • D (4th letter) is coded as 4
  • O (15th letter) is coded as 15
  • G (7th letter) is coded as 7

The code for DOG is calculated as 4×15×7=4204×15×7=420.
So, DOG is equal to 420, which corresponds to option (b) 42.

Q6: If 'book' is called 'pen', 'pen' is called 'lamp', 'lamp' is called 'desk', 'desk' is called 'chair', and 'chair' is called 'table', then where will a person sit?
(a) desk
(b) chair
(c) table
(d) lamp
Ans: 
(c) table
Explanation:
Each term in the given series is replaced with the next term in the sequence:

  • 'book' is called 'pen'
  • 'pen' is called 'lamp'
  • 'lamp' is called 'desk'
  • 'desk' is called 'chair'
  • 'chair' is called 'table'

So, following the pattern, if 'chair' is called 'table', then where a person will sit is represented by 'table,' which corresponds to option (c) table.

Q7: If the pattern is established as PQRXYZAB is written as ABZYXRPQ, how is STUVWXYZ written in the same logic?
(a) ZYXWVUTS
(b) STUWXYZV
(c) STUWXYZA
(d) STUVWXYA
Ans: 
(a) ZYXWVUTS
Explanation:
The given pattern seems to involve reversing the order of the first three letters and the last three letters, while maintaining the order of the central two letters. Applying this logic to STUVWXYZ:

  • The first three letters (STU) are reversed to UTS.
  • The last three letters (VWXYZ) are reversed to ZYX.
  • The central two letters (W and X) remain unchanged.

So, STUVWXYZ is written as ZYXWVUTS, which corresponds to option (a) ZYXWVUTS.

Q8: Following a certain logic, if XYZOPQRS is written as SRQPONZY, how is LMNJKYXZ written in that logic?
(a) ZYXJKMNL
(b) ZYXKJLMN
(c) ZYXNMJKL
(d) ZYXLMNKJ
Ans:
 (b) ZYXKJLMN
Explanation: The given logic seems to involve reversing the order of the letters and then alternating the arrangement of the last three letters. Applying this pattern to LMNJKYXZ:

  • The letters are reversed to ZYXKJNML.
  • The last three letters (K, J, N) maintain their relative order, so the final result is ZYXKJLMN.

So, LMNJKYXZ is written as ZYXKJLMN, which corresponds to option (b) ZYXKJLMN.

Q9: In a certain code language, CATAMARAN is written as ANAMARATC. How will BICYCLE be written in the same code language?
(a) ELYCICIB
(b) ELYCICEB
(c) ELYCIBEI
(d) ELYCIBEC
Ans: (c) ELYCIBEI
Explanation: 
In the given code language, the pattern involves splitting the word into two halves and then reversing the order of the halves. Applying this pattern to BICYCLE:

  • The first half (BICY) is reversed to YCIB.
  • The second half (CLE) is reversed to ELC.

Combining these, we get ELYCIBEI.
So, BICYCLE is written as ELYCIBEI, which corresponds to option (c) ELYCIBEI.

Q10: In a certain code language, 'PENALTY' is written as 'OFMZKXS'. How will 'HARMONY' be written in that code language?
(a) GZNLIRX
(b) GZNLMIR
(c) GZNMILR
(d) GZNLIRM
Ans: 
(b) GZNLMIR
Explanation:
To find the pattern, let's analyze the given code for 'PENALTY' and 'OFMZKXS':

  • 'PENALTY' is written as 'OFMZKXS'

It appears that each letter is replaced by the letter that is four positions ahead of it in the alphabet.
Applying the same pattern to 'HARMONY':

  • H + 4 = L
  • A + 4 = E
  • R + 4 = M
  • M + 4 = I
  • O + 4 = K
  • N + 4 = I
  • Y + 4 = R

So, 'HARMONY' is written as 'L E M I K I R', which corresponds to option (b) GZNLMIR.

The document Practice Questions: Coding-Decoding | Science Olympiad Class 6 is a part of the Class 6 Course Science Olympiad Class 6.
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FAQs on Practice Questions: Coding-Decoding - Science Olympiad Class 6

1. What is coding-decoding?
Ans. Coding-decoding refers to a problem-solving technique where a given set of letters, numbers, or symbols are coded or encrypted according to a specific pattern or rule, and the coded message is then decoded or decrypted to reveal the original message using the same pattern or rule.
2. What are the common patterns used in coding-decoding?
Ans. There are several common patterns used in coding-decoding, such as letter shifting (where each letter is replaced by the letter that comes after it in the alphabet), number substitution (where each number is replaced by a corresponding letter or symbol), mirror image (where each letter is replaced by its mirror image), and so on.
3. How can I improve my coding-decoding skills?
Ans. To improve your coding-decoding skills, it is important to practice regularly and familiarize yourself with different coding patterns and rules. Solving puzzles and participating in coding-decoding competitions can also help in honing your skills. Additionally, understanding the logic behind each pattern and practicing logical reasoning can enhance your problem-solving abilities.
4. Are there any strategies or tips for solving coding-decoding problems?
Ans. Yes, there are some strategies and tips that can help in solving coding-decoding problems more effectively. It is important to carefully analyze the given pattern or rule and try to identify any recurring sequences or relationships. Breaking the code into smaller parts and solving it step by step can also make the problem more manageable. Additionally, practicing with different types of coding-decoding problems can help in developing a better understanding of the various patterns and rules involved.
5. How can coding-decoding be useful in real life?
Ans. Coding-decoding skills can be useful in various real-life situations. For example, they can be applied in cryptography to create secure communication systems, where messages are coded using encryption techniques to prevent unauthorized access. Coding-decoding skills can also be helpful in understanding and deciphering secret codes or hidden messages, which can be encountered in puzzles, treasure hunts, or even certain types of literature or media.
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