Mensa IQ Test Mensa IQ Coding and Decoding 1 — Questions and Answers
Question 1: In a certain code, BRIDGE is written as EULGJH. What is the rule being applied?
- Each letter is shifted forward by 3 (Correct answer)
- Each letter is shifted backward by 3
- Alternate letters are shifted by 2 and 4
- Each letter is replaced by its mirror in the alphabet
Correct answer: Each letter is shifted forward by 3
B+3=E, R+3=U, I+3=L, D+3=G, G+3=J, E+3=H — each letter advances 3 positions.
Question 2: If MOUSE = 13-15-21-19-5, what does 6-15-24 decode to?
- FOX (Correct answer)
- GOX
- FOY
- EOX
Correct answer: FOX
Each number is the position of the letter in the alphabet: F=6, O=15, X=24.
Question 3: In a code, CAT → DCV and DOG → EPH. Which word encodes to GQX?
- FPW
- FQW (Correct answer)
- GPW
- FPX
Correct answer: FQW
Each letter is shifted +1: C→D, A→B (but shown as C), so first letter +1, second letter+2, third letter+1 — actually C+1=D, A+2=C, T+2=V; D+1=E, O+1=P, G+1=H. Re-examining: CAT→DCV (C+1, A+2, T+2) and DOG→EPH (D+1, O+1, G+1). The pattern for G→H, P→Q, W→X decodes as FPW encoded.
Question 4: If ★=1, ■=2, ▲=3, ●=4, what is the value of ▲★■●?
- 3124 (Correct answer)
- 3142
- 1324
- 4231
Correct answer: 3124
▲=3, ★=1, ■=2, ●=4, so the sequence reads 3-1-2-4.
Question 5: COLD is coded as FROG. Using the same rule, how is HEAT coded?
- KHDW (Correct answer)
- KHEX
- JHDW
- KGDW
Correct answer: KHDW
C+3=F, O+3=R, L+3=O, D+3=G — shifting each letter by +3: H+3=K, E+3=H, A+3=D, T+3=W.
Question 6: In a certain number code, 123 means 'eat fresh fruit', 234 means 'fresh juice daily', and 345 means 'daily health boost'. What number stands for 'daily'?
- 3
- 4 (Correct answer)
- 2
- 5
Correct answer: 4
'daily' appears in codes 234 and 345; the common digit is 4.
Question 7: If PENCIL → QFODKM using a Caesar-type shift, what is RUBBER coded as?
- SVCCFS (Correct answer)
- SVDCFT
- TVCEFS
- SVCCES
Correct answer: SVCCFS
P+1=Q, E+1=F, N+1=O, C+1=D, I+1=J, L+1=M confirms shift +1; R+1=S, U+1=V, B+1=C, B+1=C, E+1=F, R+1=S.
Mensa IQ Test Mensa IQ Coding and Decoding 1
In a certain code, BRIDGE is written as EULGJH.
What is the rule being applied?