Practice Questions: Coding-Decoding | Science Olympiad for Class 5 PDF Download

• 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 'SHAPER' is written as '/ # @%+!'. How is 'PARK' written in that code?
(a) * # !?
(b) * + !?
(c) %@ !?
(d) @ * + ?
Ans: (c) %@!?
Explanation: 'LAKE' is written as '* @ ? +', 'SHAPER' is written as '/ # @ % + !'
We can match the letters to their corresponding symbols:

1. For the letter 'A':

   • In 'LAKE', 'A' is mapped to '@'. In 'SHAPER', 'A' is also mapped to '@'.

2. For the letter 'E':

   • In 'LAKE', 'E' is mapped to '+'. In 'SHAPER', 'E' is also mapped to '+'.

Now, let's break down the word 'PARK':

• 'P': In 'SHAPER', 'P' is mapped to '%'.
• 'A': From both examples, we know 'A' is mapped to '@'.
• 'R': In 'SHAPER', 'R' is mapped to '!'.
• 'K': In 'LAKE', 'K' is mapped to '?'.

Thus, 'PARK' is written as % @ ! ? in the given code.

Q3: If 'tree' is called 'flower', 'flower' is called 'river', 'river' is called 'mountain', 'mountain' is called 'ocean', and 'ocean' is called 'field', then from where honeybee collect nectar?
(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:

• COMPUTER is coded as 8
• INTERNETS 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 11 letters.

So, the code for ELECTRONICS is 11, which corresponds to option (c) 11. 

Q5: If C = 8, CAT = 39, then DOG is equal to _______.
(a) 40
(b) 41
(c) 48
(d) 56
Ans: (b) 41
Explanation: To find the pattern, let's analyze the given codes for C and CAT:

• C is coded as 8 (3+5)
• CAT is coded as 36 (8 + 6 + 25)

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

Applying the same pattern to DOG:

• D (4th letter) is coded as 4 + 5
• O (15th letter) is coded as 15 + 5
• G (7th letter) is coded as 7 + 5

The code for DOG is calculated as (4 + 5 + 15 + 5 + 7 + 5)

So, DOG is equal to 41, which corresponds to option (b) 41.

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 SRQPOZYX, how is LMNJKYXZ written in that logic?
(a) ZYXJKMNL
(b) ZXYKJNML
(c) ZYXNMJKL
(d) ZYXLMNKJ
Ans: (b)ZXYKJNML
Explanation: In the given code, "XYZOPQRS" is written as "SRQPOZYX." The pattern involves reversing the order of the letters. Let's apply the same logic to "LMNJKYXZ."

When reversed, "LMNJKYXZ" becomes "ZXYKJNML."

Thus, LMNJKYXZ is written as "ZXYKJNML."

Q9: In a certain code language, DRAWING is written as GNIWARD. How will RUNNING be written in the same code language?
(a) GNINNUR
(b) NNINGUR
(c) GNINURR
(d) GNNINRU
Ans: (a) GNINNUR
Explanation: The pattern involves reversing the entire word. So, "RUNNING" will be written as "GNNINUR."

Q10: In a certain code language, 'PENALTY' is written as 'ODMZKSX'. How will 'HARMONY' be written in that code language?
(a) GZNLIRX
(b) GZQLNMX
(c) GZQLILR
(d) GZNLIRM
Ans: (b) GZNLMIR
Explanation:  Each letter in the word "PENALTY" is replaced by the letter that comes just before it in the alphabet. Applying the same pattern to "HARMONY":

• H → G
• A → Z
• R → Q
• M → L
• O → N
• N → M
• Y → X

Thus, "HARMONY" will be written as GZQNLXM.