In India, the Postal Index Number (PIN) code system was introduced in the year 1972. It was designed and implemented under the leadership of which postal official?

Introduction / Context:
The Postal Index Number, commonly known as the PIN code, is a key part of the Indian postal system. It helps in systematically sorting and delivering mail across a very large country. This question focuses on the person credited with introducing the PIN code system in India, a common fact tested in general knowledge and Indian geography sections.

Given Data / Assumptions:
• The PIN code system in India started in 1972. • The question asks about the official who introduced this system. • Options include names of different authors and officials such as Shriram Bhikaji Velankar and D. R. Khullar. • We assume the standard exam fact that links the introduction of PIN codes to one particular postal officer.

Concept / Approach:
The PIN code system divides India into zones, sub zones and specific delivery areas using a six digit numeric code. According to standard references, the system was introduced on 15 August 1972 by Shriram Bhikaji Velankar, who was an additional secretary in the Union Ministry of Communications and a senior member of the postal services. The approach is to match this known fact with the names in the options.

Step-by-Step Solution:
Step 1: Recall the factual statement that the PIN code system was introduced in 1972 by Shriram Bhikaji Velankar. Step 2: Examine the options and locate the name that matches this fact exactly. Step 3: Option B mentions Shriram Bhikaji Velankar, which is the correct name associated with the introduction of PIN codes. Step 4: Recognise that the other names in the options are known geography authors or unrelated personalities often used as distractors. Step 5: Select Shriram Bhikaji Velankar as the correct answer.

Verification / Alternative check:
Many general knowledge books and postal history references note that Shriram Bhikaji Velankar conceived and introduced the PIN code system for India. The introduction on Independence Day of 1972 is also frequently mentioned, which reinforces the association between the system and his name. No other option matches this widely accepted detail.

Why Other Options Are Wrong:
Option A: Savinder Singh is not associated in standard references with the creation of the PIN code system. Option C: D. R. Khullar is a noted geography author whose books are used by students but he is not the official who introduced PIN codes. Option D: Mahesh Barnwal is also an author known for competitive exam books, not for designing the postal coding system.

Common Pitfalls:
Students sometimes confuse the names of authors of geography textbooks with officials responsible for administrative innovations. Another pitfall is to guess based on familiarity; a familiar name from exam guides may look attractive, but it may not be connected to the specific fact in question. Always link the correct name to the precise achievement being asked about.

Final Answer:
The PIN code system in India was introduced under the leadership of Shriram Bhikaji Velankar.