NCERT Book Class 12 Computer Science Chapter 6 Searching PDF

Download the Class 12 Computer Science Chapter 6 Searching NCERT Book PDF free, straight from the official NCERT textbook and matched to the 2026-27 CBSE syllabus. This is the original chapter, with the exact text on linear search, binary search and search by hashing, the worked Python code, the key-comparison counts, and the hash function examples that the board exam is set from.

• The full NCERT chapter on searching, with all worked Python code and the pass-by-pass comparison tables.
• Includes the back-exercise of 9 questions on linear search, binary search and hashing.
• Pairs with the NCERT Solutions, Notes and Handwritten Notes linked lower on this page.

This is the official NCERT Computer Science Chapter 6 text, hosted free for Class 12 students and matched to the 2026-27 CBSE syllabus.

What Is Inside the Searching NCERT Book Chapter

Searching is the sixth chapter of the Class 12 Computer Science NCERT textbook. It teaches how to find a value, called the key, inside a list and how to count the work each method needs. The chapter mixes plain explanation with short Python code blocks, so students learn each technique by reading a small example first. The list below shows what the original chapter holds, so students know what they are downloading.

• Why searching matters: finding one record fast is the core task behind a contact list, a dictionary app or a database lookup.
• Linear search: check each element one by one until the key is found or the list ends, the method that works on any list.
• Binary search: on a sorted list, halve the search range every step, which cuts the number of comparisons sharply.
• Search by hashing: use a hash function to jump straight to where the key should be, and handle a collision when two keys map to one slot.

Reading the original chapter matters because the board marks answers and code against the NCERT style. A student who has read the textbook once will write search code and comparison tables the way the examiner expects, which the Notes and Solutions then reinforce.

Topic List of the NCERT Chapter

The chapter follows a clear order, and the PDF keeps the NCERT section headings. The table below lists each section with a one-line note, so students can see the shape of the chapter before they read. It also helps with planning revision.

The most exam-heavy sections are binary search and search by hashing, so students should read those slowly. The comparison counts come up in nearly every board paper, so it is worth a careful first read rather than a skim.

Search Methods Covered in the Chapter

The single most useful idea in the chapter is the comparison count, which is how many key checks each method makes. Students who learn this can pick the right method on sight and answer the comparison questions the board reuses. A short summary is below so students can see what the PDF carries, but the full worked traces with every pass are in the download.

Here is the linear search loop exactly as the NCERT chapter writes it, so students get used to the real form. The loop returns the position as soon as it finds the key:

def linear_search(arr, key):
    for i in range(len(arr)):
        if arr[i] == key:          # key found
            return i               # return the position
    return -1                      # key not present

The binary search idea is the one the board tests most, because it halves the range each step. The example below follows the textbook flow with the low, mid and high markers:

def binary_search(arr, key):       # arr must be sorted
    low, high = 0, len(arr) - 1
    while low <= high:
        mid = (low + high) // 2
        if arr[mid] == key:
            return mid             # key found at mid
        elif arr[mid] < key:
            low = mid + 1          # search the right half
        else:
            high = mid - 1         # search the left half
    return -1

For hashing, the chapter uses a simple hash function like h(element) = element % 11 to choose a slot in the hash table. A collision happens when two different keys map to the same slot, and the chapter shows how to spot it.

How to Download the Class 12 Computer Science Chapter 6 PDF

The PDF is free and easy to save on any device. The steps below show students how to get the chapter and keep it for offline reading. No login or payment is needed at any stage.

• Open the download card at the top of this page and tap the PDF button.
• Save to your device so you can read the chapter offline, even without internet.
• Print if you prefer paper: the comparison tables and the code blocks stay clear when printed.
• Pair it with the NCERT Solutions linked below to attempt the 9 back-exercise questions as you read.

Many students search for the class 12 computer science chapter 6 searching pdf the night before a coding test, so a saved copy means you can revise even when the network is down. Keep the textbook PDF and the solved answers together for a full self-study set.

Why Read the Original NCERT Chapter

Notes and solutions are useful, but the original chapter is the source they all come from. There are clear reasons to read it at least once. The points below explain why the textbook still matters even when quick notes are everywhere.

• Board style: the chapter's own linear and binary search code is the safest pattern to copy in the exam.
• Full context: the chapter explains why binary search needs a sorted list, a point notes often cut for space.
• Worked examples: the in-text traces for each pass and the hash table layout are exactly what board programs are built from.
• Exercise: the back-exercise is the exact set the Solutions answer, so reading it first sharpens recall.

The honest takeaway is that the textbook is the master copy. Read it once to understand each method, then move to the Notes for revision and the Solutions for practice. That order builds stronger searching code than starting from notes alone.

How the Book PDF Pairs with the Solutions and Notes

The Book PDF gives you the original text and code. To study the chapter fully, use it with the other resources for the same chapter, all linked in the table below. The chapter sits between Sorting (Chapter 5) and Understanding Data (Chapter 7), so a quick recap of sorting first makes binary search click faster.

Tip: read the NCERT chapter first for the full picture, then revise from the Notes and test yourself with the Solutions. The textbook is where every good searching answer starts.

All NCERT Book PDFs for Class 12 Computer Science

The table links the NCERT Book PDF for every chapter in Class 12 Computer Science, so students can download the whole course in one place. Searching is highlighted.

FAQs on Searching NCERT Book PDF