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DRDO Placement Papers 2024

Overview

This page collects DRDO placement papers from 2024 with previous-year questions, solutions, and the 2024 exam pattern. It is useful when you want real drive history: what the OA looked like, which question types repeated, and how solutions were approached. Work through the papers below to build speed and accuracy, then compare against newer 2025 material so your prep matches both established DRDO patterns and the latest shifts.

DRDO written examination 2024 pattern

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

DRDO Placement Papers 2024 - actual questions & solutions

This section contains practice questions styled on DRDO placement papers 2024 (previous-year 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 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 2

Q2: A shopkeeper marks goods 50% above cost and gives a 20% discount. Find the profit percentage.

Solution:

Let CP = 100. MP = 150. SP after 20% discount = 120.

Profit % = 120 − 100 = 20%.

Answer: 20%

Question 3

Q3: The ratio of ages of A and B is 2:3. After 6 years, the ratio becomes 3:4. Find A’s present age.

Solution:

Let ages be 2x and 3x.

(2x + 6)/(3x + 6) = 3/4 4(2x + 6) = 3(3x + 6) 8x + 24 = 9x + 18 x = 6 A’s age = 2×6 = 12 years.

Answer: 12 years

Question 4

Q4: Simple interest on ₹5000 at 8% per annum for 3 years is?

Solution:

SI = (P × R × T)/100 = (5000 × 8 × 3)/100 = ₹1200.

Answer: ₹1200

Question 5

Q5: In a row of 45 students, A is 9th from the left and B is 10th from the right. How many students are between A and B if A is to the left of B?

Solution:

Positions from left: A = 9, B = 45 − 10 + 1 = 36. Students between = 36 − 9 − 1 = 26.

Answer: 26

Question 6

Q6: Pointing to a photo, Ravi said, ‘He is the son of my grandfather’s only son.’ How is the person related to Ravi?

Solution:

Grandfather’s only son = Ravi’s father. Son of Ravi’s father = Ravi himself (or his brother).

In standard puzzle framing with one son implied for the speaker context: the person is Ravi’s brother (or Ravi). Most campus keys take Brother.

Answer: Brother

Question 7

Q7: Virtual memory is typically implemented using?

Solution:

OS uses demand paging (and sometimes segmentation) to implement virtual memory.

Answer: Demand paging

Question 8

Q8: Which protocol is connection-oriented at the transport layer?

Solution:

TCP is connection-oriented; UDP is connectionless.

Answer: TCP

Question 9: valid parentheses

Show solution

Problem Statement: Given a string of brackets, determine if it is valid.

Example:

Input: "()[]{}"
Output: true

Solution (Java):

public boolean isValid(String s) {
    Deque<Character> st = new ArrayDeque<>();
    Map<Character, Character> pair = Map.of(')', '(', ']', '[', '}', '{');
    for (char c : s.toCharArray()) {
        if (pair.containsValue(c)) st.push(c);
        else if (st.isEmpty() || st.pop() != pair.get(c)) return false;
    }
    return st.isEmpty();
}

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

Question 10: 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)

Question 11: 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)

Key insights from 2024 DRDO written examination

  1. Technical Section is Critical: Must perform well in defence technology 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: DRDO written examination
  6. Focus Areas: Defence technology, radar systems, missile systems, engineering fundamentals

DRDO 2024 interview experiences

Based on candidate experiences from 2024 DRDO interviews:

2024 Interview Process:

  1. Written Examination (90 minutes): Technical (40-50) + Aptitude (20-25)
  2. Technical Interview (60-90 minutes): Defence technology concepts, radar systems, missile systems, engineering fundamentals, problem-solving
  3. HR Interview (30-45 minutes): Behavioral questions, company fit, motivation, defence technology passion

Common 2024 Interview Topics:

  • Technical: Defence technology, radar systems, missile systems, engineering fundamentals
  • Aptitude: Quantitative reasoning, logical reasoning
  • Behavioral: Problem-solving approach, defence technology passion, teamwork, motivation

Success Tips:

  • Strong technical performance is essential - master defence technology and engineering fundamentals
  • Understand radar systems and missile systems
  • Practice problem-solving in defence technology domain
  • Prepare behavioral examples demonstrating defence technology passion
  • Understand DRDO’s projects and defence technology programs
  • Practice explaining complex technical concepts clearly

For detailed interview experiences, visit DRDO Interview Experience page.

Preparation tips for DRDO 2024 pattern

  1. Master Technical Fundamentals: Focus on defence technology, radar systems, missile systems - study thoroughly
  2. Engineering Fundamentals: Strong understanding of engineering fundamentals relevant to defence technology
  3. Practice Previous Year Papers: Solve DRDO written exam papers from 2020-2024 to understand patterns
  4. Time Management: Practice completing 40-50 technical questions in 60 minutes
  5. Aptitude Practice: Practice quantitative and logical reasoning
  6. Defence Technology: Deep understanding of radar systems, missile systems, defence systems
  7. Problem-Solving: Practice solving complex technical problems in defence technology domain
  8. Behavioral Preparation: Prepare examples using STAR format - defence technology passion, problem-solving
  9. Mock Tests: Take timed practice tests to improve speed and accuracy
  10. DRDO Projects: Stay updated with DRDO’s projects and defence technology programs

Comments & Suggestions

2025 papers

DRDO Technical Questions

Interview experience

Preparation guide

DRDO hub

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