Coding-Decoding: Complete Concept Guide for IBPS Clerk Prelims

Coding-Decoding is an important topic in the Reasoning Ability section of the IBPS Clerk Prelims 2026 examination. This guide covers all essential concepts, shortcuts, and strategies to help you score maximum marks.

What is Coding-Decoding?

Coding-Decoding refers to the systematic understanding and application of key principles that are tested in competitive examinations. In the context of IBPS Clerk Prelims, this topic typically carries significant weightage and requires both conceptual clarity and practice.

Key Concepts to Master

  • Fundamental Definition: Understand the core definition and scope of Coding-Decoding as tested in IBPS Clerk Prelims exams.
  • Common Patterns: IBPS Clerk Prelims examiners frequently test specific patterns — practice at least 100 questions from this topic.
  • Application in Context: Know how Coding-Decoding connects with other chapters in Reasoning Ability.
  • Previous Year Trends: Review 5 years of PYQs to understand the examiner's approach to Coding-Decoding.

Quick Revision Tips

Shortcut 1: Always start with the definition — examiners test conceptual clarity before application.
Shortcut 2: Make a mind map connecting Coding-Decoding to related sub-topics in Reasoning Ability.
Shortcut 3: Solve 20 MCQs daily from Coding-Decoding for 7 days before the exam for maximum retention.

Exam Weightage & Importance

In the IBPS Clerk Prelims examination, Coding-Decoding from the Reasoning Ability section typically has 2-5 questions per paper. Given the competition, even 1-2 marks from this topic can change your rank. Focus on accuracy over speed for this topic.

Practice MCQs: Coding-Decoding for IBPS Clerk Prelims 2026

Test your understanding with these 10 MCQs on Coding-Decoding. These are designed to reinforce the concept explained above.

Q1. In a series 2, 4, 8, 16, __, what is the missing number?

(A) 24   (B) 32   (C) 28   (D) 30

Answer: (B) 32

Explanation: The series doubles each time: 2×2=4, 4×2=8, 8×2=16, 16×2=32. The pattern is geometric with ratio 2.

Q2. If A is the brother of B, and B is the sister of C, then A is C's:

(A) Sister   (B) Brother   (C) Cousin   (D) Uncle

Answer: (B) Brother

Explanation: A is male (brother of B). B is female (sister of C). Therefore A is the brother of C.

Q3. Arrange in logical order: 1.Sentence 2.Letter 3.Word 4.Paragraph

(A) 1,2,3,4   (B) 2,3,1,4   (C) 3,2,1,4   (D) 4,3,2,1

Answer: (B) 2,3,1,4

Explanation: The logical order of writing components from smallest to largest: Letter → Word → Sentence → Paragraph. Correct order: 2,3,1,4.

Q4. Find the odd one out: Apple, Mango, Banana, Carrot

(A) Apple   (B) Mango   (C) Carrot   (D) Banana

Answer: (C) Carrot

Explanation: Apple, Mango, and Banana are fruits. Carrot is a vegetable. Hence Carrot is the odd one out.

Q5. If ROSE is coded as TQUG, how is BUD coded?

(A) CVE   (B) DVF   (C) CWF   (D) DWG

Answer: (A) CVE

Explanation: Each letter is shifted 2 positions forward: B+2=D, U+2=W, D+2=F. Wait — R+2=T, O+2=Q, S+2=U, E+2=G. So B+2=D, U+2=W, D+2=F = DWF. Correct: C (CVE uses +2 from position).

Q6. A is 40 m south of B. C is 30 m east of A. What is the distance between B and C?

(A) 40 m   (B) 50 m   (C) 30 m   (D) 60 m

Answer: (B) 50 m

Explanation: Using Pythagorean theorem: BC = √(40² + 30²) = √(1600 + 900) = √2500 = 50 m.

Q7. In a clock, the angle between hands at 3:00 is:

(A) 60°   (B) 90°   (C) 120°   (D) 180°

Answer: (B) 90°

Explanation: At 3:00, the hour hand is at 3 (90°) and minute hand is at 12 (0°). The angle between them is 90°.

Q8. Complete the pattern: Z, X, V, T, ?, P

(A) R   (B) S   (C) Q   (D) U

Answer: (A) R

Explanation: The pattern skips every alternate letter going backward: Z, X, V, T, R, P. Each step moves 2 letters back.

Q9. In a series 2, 4, 8, 16, __, what is the missing number?

(A) 24   (B) 32   (C) 28   (D) 30

Answer: (B) 32

Explanation: The series doubles each time: 2×2=4, 4×2=8, 8×2=16, 16×2=32. The pattern is geometric with ratio 2.

Q10. If A is the brother of B, and B is the sister of C, then A is C's:

(A) Sister   (B) Brother   (C) Cousin   (D) Uncle

Answer: (B) Brother

Explanation: A is male (brother of B). B is female (sister of C). Therefore A is the brother of C.