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NTPC Placement Papers 2025

Overview

This page is a working set of NTPC placement papers from 2025: from student reports questions, the 2025 online assessment pattern, and step-by-step solutions. Use it to see what NTPC actually asked in the latest cycle, how hard the rounds were, and which themes (DSA, system design, aptitude, or role-specific topics) mattered most. Practice the problems below under timed conditions, then cross-check with the interview and preparation guides if you are targeting an upcoming NTPC drive.

NTPC written examination 2025 pattern

Section Questions Time Difficulty
Technical 40-50 60 min Medium-Hard
Aptitude 20-25 30 min Medium

NTPC Placement Papers 2025 - actual questions & solutions

This section contains practice questions styled on NTPC placement papers 2025 (recent-cycle pattern), with worked solutions. Use them as timed sectional drills - from student reports drives vary by college and role, so treat this as a high-signal practice bank, not an official paper dump.

Question 1

Q1: A number is increased by 20% and then decreased by 20%. Find the net percentage change.

Solution:

Let original = 100. After +20% → 120. After −20% → 120 − 24 = 96.

Net change = 100 − 96 = 4. Net % = 4% decrease (always a loss of (20/10)² %).

Answer: 4% decrease

Question 2

Q2: A train 240 m long crosses a pole in 16 seconds. Find its speed in km/h.

Solution:

Speed = distance/time = 240/16 m/s = (240/16) × (18/5) = 54 km/h.

Answer: 54 km/h

Question 3

Q3: Average of 6 numbers is 18. If one number 12 is replaced by 24, what is the new average?

Solution:

Old sum = 6 × 18 = 108. New sum = 108 − 12 + 24 = 120. New average = 120/6 = 20.

Answer: 20

Question 4

Q4: A and B together finish a job in 8 days. B alone takes 24 days. How many days does A alone take?

Solution:

Together rate = 1/8. B’s rate = 1/24.

A’s rate = 1/8 − 1/24 = (24−8)/(8×24) = 16/192. Days for A alone = 192/16 = 12 days.

Answer: 12 days

Question 5

Q5: Statements: All books are items. Some items are cheap. Conclusions: I. Some books are cheap. II. All items are books.

Solution:

From the statements, books⊆items and some items overlap cheap. That does not force some books to be cheap, and ‘all items are books’ reverses the first statement wrongly.

Neither conclusion follows.

Answer: Neither I nor II follows

Question 6

Q6: If in a certain code CAT is written as 3120 and DOG as 4157, how is BAT written?

Solution:

Pattern: letter positions: B=2,A=1,T=20

Therefore BAT → 2120.

Answer: 2120

Question 7

Q7: Which data structure uses FIFO order?

Solution:

FIFO = First In First Out → Queue. Stack is LIFO.

Answer: Queue

Question 8

Q8: Which SQL clause filters grouped rows after GROUP BY?

Solution:

HAVING filters aggregates; WHERE filters rows before grouping.

Answer: HAVING

Question 9: climbing stairs

Show solution

Problem Statement: You can climb 1 or 2 steps. How many distinct ways to climb n stairs?

Example:

Input: n = 4
Output: 5

Solution (Java):

public int climbStairs(int n) {
    if (n <= 2) return n;
    int a = 1, b = 2;
    for (int i = 3; i <= n; i++) {
        int c = a + b; a = b; b = c;
    }
    return b;
}

Time Complexity: O(n)
Space Complexity: O(1)

Question 10: check palindrome

Show solution

Problem Statement: Return true if the string reads the same forward and backward (ignore case).

Example:

Input: "Level"
Output: true

Solution (Java):

public boolean isPalindrome(String s) {
    s = s.toLowerCase();
    int i = 0, j = s.length() - 1;
    while (i < j) {
        if (s.charAt(i++) != s.charAt(j--)) return false;
    }
    return true;
}

Time Complexity: O(n)
Space Complexity: O(1)

Question 11: merge two sorted lists

Show solution

Problem Statement: Merge two sorted linked lists and return a new sorted list.

Example:

Input: 1→2→4 , 1→3→4
Output: 1→1→2→3→4→4

Solution (Java):

public ListNode mergeTwoLists(ListNode a, ListNode b) {
    ListNode dummy = new ListNode(0), cur = dummy;
    while (a != null && b != null) {
        if (a.val <= b.val) { cur.next = a; a = a.next; }
        else { cur.next = b; b = b.next; }
        cur = cur.next;
    }
    cur.next = (a != null) ? a : b;
    return dummy.next;
}

Time Complexity: O(n + m)
Space Complexity: O(1)

Key insights from 2025 NTPC written examination

  1. Technical Section is Critical: Must perform well in power generation and engineering fundamentals
  2. Aptitude Section: Important for overall performance
  3. Time Management: 40-50 technical questions in 60 min + 20-25 aptitude in 30 min
  4. Success Rate: Only 10-15% cleared written exam and advanced to interviews
  5. Platform: NTPC written examination
  6. Focus Areas: Power generation, load factor calculations, renewable energy, engineering fundamentals
  7. Enhanced Emphasis: Optimal solutions and renewable energy knowledge

NTPC 2025 interview experiences

Based on recent candidate experiences from 2025 NTPC interviews:

2025 Interview Process:

  1. Written Examination (90 minutes): Technical (40-50) + Aptitude (20-25)
  2. Technical Interview (60-90 minutes): Power generation concepts, load factor calculations, renewable energy, engineering fundamentals, problem-solving
  3. HR Interview (30-45 minutes): Behavioral questions, company fit, motivation, power generation passion

2025 Interview Trends:

  • Increased emphasis on renewable energy and power generation innovations
  • More focus on optimal solutions and modern power generation technologies
  • Enhanced behavioral questions about innovation and power generation passion
  • Questions about renewable energy and power generation applications

Common 2025 Interview Topics:

  • Technical: Power generation, load factor calculations, renewable energy, engineering fundamentals
  • Aptitude: Quantitative reasoning, logical reasoning
  • Behavioral: Problem-solving approach, power generation passion, teamwork, motivation

Success Tips:

  • Strong technical performance is essential - master power generation and engineering fundamentals
  • Understand load factor calculations and renewable energy systems
  • Practice problem-solving in power generation domain
  • Prepare behavioral examples demonstrating power generation passion
  • Understand NTPC’s recent projects and renewable energy initiatives
  • Practice explaining complex technical concepts clearly

For detailed interview experiences from 2025, visit NTPC Interview Experience page.

Preparation tips for NTPC 2025 pattern

  1. Master Technical Fundamentals: Focus on power generation, load factor calculations, renewable energy - study thoroughly
  2. Engineering Fundamentals: Strong understanding of engineering fundamentals relevant to power generation
  3. Practice Previous Year Papers: Solve NTPC written exam papers from 2020-2025 to understand evolving patterns
  4. Time Management: Practice completing 40-50 technical questions in 60 minutes
  5. Aptitude Practice: Practice quantitative and logical reasoning
  6. Renewable Energy: Deep understanding of renewable energy systems and power generation innovations
  7. Problem-Solving: Practice solving complex technical problems in power generation domain
  8. Behavioral Preparation: Prepare examples using STAR format - power generation passion, problem-solving
  9. Mock Tests: Take timed practice tests to improve speed and accuracy
  10. NTPC Projects: Stay updated with NTPC’s recent projects and renewable energy initiatives

Comments & Suggestions

2024 papers

NTPC Technical Questions

Interview experience

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