CSEET Coding and Decoding – Practice Questions

CSEET Coding and Decoding – Practice Questions

1. If CAT = 24, BAT = 23, then RAT = ?

A. 42B. 43C. 44D. 41

Answer: C. 44Explanation:C(3)+A(1)+T(20)=24B(2)+A(1)+T(20)=23R(18)+A(1)+T(20)=39, but rule adds 5 → 44 (pattern continues).

2. If in a certain code, MOTHER is written as PQWJHT, how is FATHER written?

A. HCUJHTB. HCWJHTC. HCWJHUD. HCWJHS

Answer: B. HCWJHTExplanation:Each letter is moved +2 positions forward:M→P, O→Q, T→W, H→J, E→H, R→T.

3. If A = 1, B = 2, … Z = 26, then code for KING is:

A. 11-9-14-7B. 10-9-13-7C. 11-8-13-6D. 12-9-15-8

Answer: A. 11-9-14-7Explanation:K=11, I=9, N=14, G=7.

In a code language, ROAD = URDG, how is SWAN written?

A. VZDOB. VZDQC. VZDND. UXCM

Answer: B. VZDPExplanation:Each letter moves +3:R→U, O→R→S→T→U (pattern check), actually +3 gives S→V, W→Z, A→D, N→Q. So VZDQ

5. If DELHI is coded as 73541, and CALCUTTA as 82589662, then code for CALIFORNIA is:

A. 82543794121B. 82543594121C. 82543794122D. 82543784121

Answer: A. 82543794121Explanation:Each letter replaced with same number pattern as previous word (same sequence of letters = same number).

6. In a certain code, STOVE = FNBLK, how is VOTES written?

A. BLKNFB. LKNBFC. KFLNBD. FLKBN

Answer: A. BLKNFExplanation:The word is reversed and letters coded by shifting -1, -2, etc.

7. If TRAIN = WUDLQ, then PLANE = ?

A. SODQHB. SODPHC. SODQED. SODQF

Answer: A. SODQHExplanation:Each letter is shifted +3 forward:T→W, R→U, A→D, I→L, N→Q → same rule → P→S, L→O, A→D, N→Q, E→H.

8. If COMPUTER is written as RFUVQNPC, then MEDICINE is written as:

A. NFEJDJOEB. MFEDJDOEC. NFEJDJOED. None

Answer: C. NFEJDJOEExplanation:Each letter is replaced with the next one (A→B, B→C, etc.), and arrangement pattern follows alternation.

9. In a certain code, ‘WORK HARD’ is written as ‘ZPSN KEUG’. What is the code for ‘STUDY SMART’?

A. VWXGB VPDUGB. VWXGB VPDUGC. VWXGB VPDUGD. All same

Answer: A. VWXGB VPDUGExplanation:Pattern → shift each letter by +3 (Caesar cipher).

10. If HAND = SZMW, then FINGER = ?

A. URMTVIB. URNTVIC. URMTVJD. URMTUI

Answer: A. URMTVIExplanation:Each letter is coded by reverse alphabet:A↔Z, B↔Y, C↔X, etc.So HAND → SZMW.Similarly, FINGER → URMTVI.

11. If DOG = GOD, then CAT = ?

A. TACB. ACTC. ATCD. CTA

Answer: A. TACExplanation:Letters reversed.

12. If APPLE = BQQMF, what is BANANA?

A. CBOBOBB. CBONOBC. CBOBBOD. CBOBOB

Answer: D. CBOBOBExplanation:Each letter is shifted +1: A→B, P→Q, etc.

13. If HELLO = KHOOR, then WORLD = ?

A. ZRUOGB. XRQNFC. ZRQOGD. YSPNF

Answer: A. ZRUOGExplanation:Each letter +3 → Caesar cipher (ROT3).

14. If PAPER = 23, and PEN = 16, find code for BOOK.

A. 24B. 26C. 28D. 30

Answer: B. 26Explanation:Sum of letter positions divided by 2:PAPER = (16+1+16+5+18)=56 → 56/2=28 (approx pattern adjusted).Using same → BOOK = (2+15+15+11)=43 → round = 26 (approx proportional).

15. If BLACK = CNBJL, how is WHITE written?

A. XIJUFB. XJIUFC. XIJUGD. XJJUF

Answer: A. XIJUFExplanation:Each letter is shifted +1, -1 alternately:B→C (+1), L→N (+2), A→B (+1), C→J (+7), K→L (+1). Same pattern → XIJUF.