Coding & Decoding
29 questions available
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Q1.If BAT is coded as 283, CAT is coded as 383 and ARE is coded as 801, then the code for BETTER is:
Correct Answer: C
Correct Answer: 123301.
Q2.If BOY is coded as 539 and GIRL is coded as 8627 then how would you encode GLORY?
Correct Answer: D
From 'BOY' (539) and 'GIRL' (8627), we get individual letter mappings: G=8, L=7, O=3, R=2, Y=9. Combining these, GLORY is coded as 87329.
Q3.If SELFLESS is coded as SSEFLES, how is BROKER written in that code?
Correct Answer: B
Split word into halves: BRO and KER. Reverse each half: ORB and REK. Place second reversed half first: REKORB.
Q4.Solve the cryptarithm: C + CA = ATT (representing digits, CA is 2-digit, ATT is 3-digit). What is the value of C?
Correct Answer: C
Equation: C + 10C + A = 100A + 11T => 11C - 99A = 11T => C - 9A = T. Since C, A, T are digits and A cannot be 0, A must be 1. C - 9 = T => C must be 9 and T = 0. (9 + 91 = 100).
Q5.In a certain code MISSIONS is written as MSIISNOS. How is INTERNET written in that code?
Correct Answer: C
First and last letters stay in place. Middle letters are swapped in pairs: NT → TN, ER → RE, NE → EN. This yields ITENNRTE.
Q6.If 7+2-1 = H and 22+8-6 = W. What is the letter for 11 + 6 - 1 = ?
Correct Answer: C
7+2-1 = 8 (8th letter is H). 11+6-1 = 16 (16th letter is P).
Q7.If FEED is coded as 4339, then what will be the code for DEEF?
Correct Answer: C
Matching: F=4, E=3, E=3, D=9. Therefore, DEEF = 9334.
Q8.If 2 x 2 = 44, 3 x 2 = 94, then what does 9 x 4 equal?
Correct Answer: C
The rule is concatenating squares: A × B = (A²)(B²). For 2×2 => 4 and 4 => 44. For 3×2 => 9 and 4 => 94. For 9×4 => 9²=81 and 4²=16 => 8116.
Q9.If: 22 × 33 = 4499, 33 × 44 = 991616, Then, 44 × 55 = ?
Correct Answer: A
The pattern squares each double digit separately: 22 * 33 -> 2^2=4, 2^2=4, 3^2=9, 3^2=9 -> 4499. For 44 * 55, we do: 4^2=16, 4^2=16, 5^2=25, 5^2=25 -> 16162525.
Q10.1 = 0, 2 = 8, 3 = 16, 4 = ?
Correct Answer: B
The formula is: n * 8 - 8. For n = 1: 1*8 - 8 = 0. For n = 2: 2*8 - 8 = 8. For n = 3: 3*8 - 8 = 16. For n = 4: 4*8 - 8 = 24.
Q11.If DEEF → 4556, then 6554 = ?
Correct Answer: B
Since D=4, E=5, E=5, F=6, reversing the digits to 6554 maps to: 6=F, 5=E, 5=E, 4=D, which spells FEED.
Q12.Rearrange the word AKLCIHA?
Correct Answer: A
The letters AKLCIHA can be rearranged to spell KALACHI, which is a city/village.
Q13.Rearrange the word DFFADLOI
Correct Answer: C
The letters DFFADLOI rearrange to form the word DAFFODIL, which is a type of flower.
Q14.If 3=6, 4=8, and 5=10, then 6 = ?
Correct Answer: B
Each number on the left is multiplied by 2 to get the value on the right: 3*2=6, 4*2=8, 5*2=10. Therefore, 6 * 2 = 12.
Q15.If A= 2, B= 4, C= 6, then what E =?
Correct Answer: C
Each letter is coded as twice its alphabetical position: A (1*2=2), B (2*2=4), C (3*2=6). Since E is the 5th letter, its code is: 5 * 2 = 10.
Q16.If CAT = 24 and DOG = 26, then FOX = ?
Correct Answer: A
Sum of alphabetical positions of letters: C(3) + A(1) + T(20) = 24. DOG = D(4) + O(15) + G(7) = 26. FOX = F(6) + O(15) + X(24) = 45.
Q17.If A + H2 = 7, then what is Z – O?
Correct Answer: C
Alphabet positions: Z = 26, O = 15. Therefore, Z - O = 26 - 15 = 11.
Q18.IF FELLOW IS CODED AS 465531 THEN ELLOW IS CODED AS?
Correct Answer: C
Letter coding: F=4, E=6, L=5, O=3, W=1. Replacing the letters in ELLOW yields 65531.
Q19.IF LAME IS CODED AS: 3425 , COOK=4006 , TEST=8598 then what is the code for : 2098?
Correct Answer: B
Decoded letters: 2=M, 0=O, 9=S, 8=T. The code 2098 represents the word MOST.
Q20.If BOX is coded as CDPQYZ, how would you write COAT in code?
Correct Answer: D
B -> C (+1), O -> D (-11), X -> P (-8). Suffix is BCUV. Similarly: C -> D (+1), O -> D (-11), A -> P (-8), T -> Q (-3) + BCUV = DEPQBCUV.