DRDO Placement Papers 2026 | Exam Pattern, Questions & Interview Tips

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Introduction

Defence Research and Development Organisation (DRDO) is India's premier agency for military research and development. As one of the most prestigious government organizations, DRDO offers challenging and rewarding career opportunities for engineering and science graduates. Working at DRDO means contributing to national security and defense technology, making it a highly sought-after employer for those passionate about research and innovation.

This comprehensive guide covers everything you need to know about DRDO placement papers for 2026. We have analyzed the latest recruitment patterns, compiled sample questions from previous years, and gathered insights from successful candidates. Whether you're preparing for the Scientist 'B' exam or other DRDO recruitment drives, this article will help you understand the selection process and prepare effectively.

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DRDO Exam Pattern 2026

Note: DRDO Scientist 'B' recruitment involves a written test followed by personal interview. GATE scores are often considered for shortlisting.

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Quantitative Aptitude Questions (with Answers)

Question 1

If 2^x = 3^y = 6^z, find the value of 1/x + 1/y.

Explanation: Let 2^x = 3^y = 6^z = k. Then 2 = k^(1/x), 3 = k^(1/y), 6 = k^(1/z). Since 2×3 = 6, k^(1/x) × k^(1/y) = k^(1/z). So 1/x + 1/y = 1/z.

Question 2

The sum of first 20 natural numbers is 210. Find the sum of first 40 natural numbers.

Explanation: Sum of first n natural numbers = n(n+1)/2. For n=40: 40×41/2 = 820.

Question 3

A man invests ₹10,000 at 10% p.a. compound interest for 2 years. Find the interest earned.

Explanation: CI = 10000[(1.1)² - 1] = 10000 × 0.21 = 2100.

Question 4

If the ratio of ages of A and B is 3:5 and the sum of their ages is 64 years, find the age of B after 4 years.

Explanation: Let ages be 3x and 5x. 3x+5x=64, x=8. B's age = 40. After 4 years = 44.

Question 5

A train 100m long crosses a pole in 10 seconds. Find the time taken to cross a platform 200m long.

Explanation: Speed = 100/10 = 10 m/s. Time for platform = (100+200)/10 = 30 seconds.

Question 6

Find the next number: 1, 1, 2, 3, 5, 8, 13, ?

Explanation: Fibonacci series: Each number is sum of previous two.

Question 7

The area of a circle is 154 sq cm. Find the area of square inscribed in it.

Explanation: Radius r = √(154/π) ≈ √(154×7/22) = √49 = 7 cm. Diagonal of square = diameter = 14 cm. Side = 14/√2 = 7√2 cm. Area = (7√2)² = 98 sq cm.

Question 8

How many numbers between 200 and 600 are divisible by 4, 5, and 6?

Explanation: LCM of 4,5,6 = 60. First number ≥200 divisible by 60 = 240. Last ≤600 = 600. Number of terms = ((600-240)/60) + 1 = 7.

Question 9

A can do a work in 15 days, B in 20 days. They work together for 4 days, then A leaves. How many more days will B take?

Explanation: Combined 4 days: 4(1/15 + 1/20) = 4(7/60) = 28/60 = 7/15. Remaining = 8/15. B's time = (8/15)/(1/20) = 160/15 = 10.67 days.

Question 10

If a+b=10 and ab=21, find a²+b².

Explanation: a²+b² = (a+b)² - 2ab = 100 - 42 = 58.

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Verbal Ability Questions (with Answers)

Question 1

Choose synonym for "INNOVATIVE":

a) Traditional b) Creative c) Conventional d) Ordinary

Question 2

Fill blank: The research team made a significant _______ in missile technology.

a) breakthrough b) setback c) failure d) regression

Question 3

Identify error: "The committee of experts are reviewing the proposal."

a) The committee b) of experts c) are d) reviewing

Question 4

Rearrange: 1. Defense technology is crucial for national security 2. DRDO develops advanced weapons systems 3. Research requires specialized knowledge 4. Scientists work on cutting-edge projects

Question 5

Choose antonym of "SOPHISTICATED":

a) Advanced b) Complex c) Simple d) Modern

Question 6

Complete: Scientist : Laboratory :: Soldier : ?

a) Barracks b) Battlefield c) Uniform d) Weapon

Question 7

Choose correct spelling:

a) Technology b) Technolgy c) Technologie d) Tecnology

Question 8

Fill preposition: The project is focused _______ developing new radar systems.

a) on b) in c) at d) with

Question 9

Identify figure of speech: "The missile flew like an arrow."

a) Simile b) Metaphor c) Personification d) Hyperbole

Question 10

Choose best fit: "The _______ analysis revealed critical vulnerabilities."

a) thorough b) superficial c) hasty d) incomplete

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Technical/Domain Questions (with Answers)

Question 1

What is the difference between radar and sonar?

• Radar: Uses radio waves, works in air/space, detects objects, measures distance/speed
• Sonar: Uses sound waves, works underwater, detects submarines/objects, measures depth/distance
• Radar frequency: MHz-GHz, Sonar frequency: Hz-kHz

Question 2

Explain the working principle of a guided missile.

• Launch system propels missile
• Guidance system (inertial, GPS, laser, radar) directs to target
• Control surfaces (fins) adjust trajectory
• Warhead delivers payload
• Types: Surface-to-air, air-to-air, surface-to-surface, cruise missiles

Question 3

What is stealth technology in aircraft?

• Reduces radar cross-section (RCS)
• Special shapes to deflect radar waves
• Radar-absorbent materials (RAM)
• Reduces infrared, visual, acoustic signatures
• Examples: F-35, B-2 bomber, Sukhoi Su-57

Question 4

Explain the difference between analog and digital communication systems.

• Analog: Continuous signals, susceptible to noise, simpler circuits
• Digital: Discrete signals, noise-resistant, error correction, complex processing
• Digital advantages: Better quality, encryption, multiplexing, storage

Question 5

What are the main components of a satellite communication system?

• Uplink: Earth station to satellite
• Transponder: Receives, amplifies, retransmits
• Downlink: Satellite to earth station
• Ground station: Control and monitoring
• Antennas: Parabolic dishes for transmission/reception

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Interview Tips

• Focus on research aptitude - DRDO looks for candidates with strong research orientation. Be prepared to discuss research methodology, problem-solving approaches.

• Know defense technology - Research current defense projects, missile systems (Agni, Prithvi, BrahMos), and India's defense capabilities.

• Prepare for technical depth - DRDO interviews are highly technical and in-depth. Be thorough with your core subjects and recent advancements.

• Be ready for security questions - DRDO work involves national security. Expect questions about integrity, confidentiality, and commitment to national service.

• Show passion for defense research - Demonstrate genuine interest in contributing to India's defense capabilities through research and innovation.

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Salary Package Information

Additional Benefits:

• Dearness Allowance (DA)
• House Rent Allowance (HRA)
• Transport Allowance
• Medical facilities for family
• Leave Travel Concession (LTC)
• Provident Fund
• Gratuity
• Research grants and awards

Note: Total CTC for Scientist 'B' typically ranges from ₹12-15 LPA including all allowances and benefits.

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Conclusion

DRDO offers one of the most prestigious and challenging careers in defense research and development in India. The selection process is highly competitive, requiring exceptional technical knowledge, strong research aptitude, and a genuine commitment to national security.

To succeed in DRDO's recruitment process, focus on achieving excellent GATE scores, strengthen your core engineering/science fundamentals, and stay updated with defense technology developments. Remember that DRDO looks for candidates who are not just technically brilliant but also have the right attitude and passion for defense research.

Ready to join DRDO? Start your preparation today with our comprehensive question bank and focus on building a strong foundation in your discipline. Your journey to a rewarding career at DRDO begins here!

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Last Updated: March 2026

Frequently Asked Questions

What is the salary range for DRDO placements in 2026?

DRDO salary typically depends on the specific post, pay level, and whether the role is through a government recruitment/placement-style process. For many DRDO technical roles, candidates can expect competitive pay aligned with Central Government pay scales, along with allowances such as DA, HRA, and other benefits as applicable. Exact figures vary by notification and category, so always refer to the official DRDO recruitment/placement notification for the 2026 cycle.

What are the eligibility criteria for DRDO placement papers 2026?

Eligibility generally includes an engineering or science background relevant to the applied discipline (e.g., Electronics, Mechanical, Computer Science, Aeronautics, etc.), along with the required minimum percentage/CGPA and age limits as specified in the official notice. Some roles may also require specific qualifications like GATE/NET or experience, depending on the recruitment stream. Always match your degree, branch, and any required credentials exactly to the 2026 notification.

How difficult are DRDO placement papers 2026 and what is the exam pattern?

DRDO placement papers are usually considered moderately to highly competitive because they test both aptitude and domain knowledge at a deeper level. The pattern commonly includes sections such as quantitative aptitude, reasoning, general awareness, and technical subjects related to your engineering/science field. Difficulty increases for technical questions, so a strong foundation in core concepts and standard problem-solving methods is essential.

How should I prepare for DRDO placement papers 2026 (best tips)?

Start by building a topic-wise plan: cover aptitude basics first (percentages, algebra, probability, logical reasoning) and then move to your core technical syllabus. Practice previous-year questions and mock tests under timed conditions to improve accuracy and speed. Maintain a revision routine for formulas, key concepts, and frequently asked theory points, especially for your technical section.

What are the interview rounds for DRDO placements 2026?

If the process includes interviews, it typically follows a shortlisting stage after the written/technical screening, followed by one or more interview rounds. Interviews often assess subject understanding, problem-solving approach, and your ability to explain technical concepts clearly. Some candidates may also face a technical discussion or scenario-based questions related to their branch and project/work experience.

What common topics are asked in DRDO placement papers 2026?

Aptitude sections commonly include quantitative reasoning (algebra, arithmetic, number systems), logical reasoning, data interpretation, and sometimes general awareness. Technical sections usually focus on core subjects from your degree syllabus, such as digital logic, signals and systems, control systems, thermodynamics, mechanics, programming/data structures, or communication fundamentals depending on your branch. Reviewing standard textbooks and previous-year question patterns helps you identify high-weight areas.

How can I apply for DRDO placement papers 2026?

You typically apply through the official DRDO website or the designated recruitment portal mentioned in the 2026 notification. The process usually includes filling out an online application form, uploading required documents (photo, signature, certificates), and paying any applicable application fee. After submission, download the confirmation/acknowledgement and keep track of deadlines, admit card dates, and exam schedule updates.

What is the selection rate for DRDO placements 2026 and how can I improve my chances?

Selection rate varies significantly by year, number of vacancies, and the number of applicants, so there is no single fixed percentage for 2026. Generally, candidates with strong aptitude scores and solid technical fundamentals perform better in shortlisting and interviews. To improve your chances, focus on high-frequency topics, take regular mocks, strengthen weak areas, and prepare crisp explanations for technical concepts during interviews.

Quick disclosure: candidates report the patterns summarised above, and details differ by role and year. Cross-check the official notification and your own invite email for the version that actually applies to you before you prepare around any figure.