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

Meta Description: Prepare for DRDO placement papers 2026 with our comprehensive guide. Get exam pattern, aptitude questions, technical questions, interview tips & salary details.

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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

Section	Number of Questions	Time Duration	Topics Covered
General Awareness	20	20 minutes	Current affairs, defense, science & tech
Quantitative Aptitude	20	25 minutes	Arithmetic, Algebra, Geometry, DI
Reasoning Ability	20	25 minutes	Logical, Analytical, Non-verbal
English Language	20	20 minutes	Grammar, Vocabulary, Comprehension
Technical Subject	100	120 minutes	Core engineering/science discipline
Total	180	210 minutes	-

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

Position	Pay Scale	Level	Location
Scientist 'B'	₹56,100 - ₹1,77,500	Level 10	DRDO labs across India
Scientist 'C'	₹67,700 - ₹2,08,700	Level 11	R&D establishments
Scientist 'D'	₹78,800 - ₹2,09,200	Level 12	Senior positions
Junior Research Fellow	₹31,000 - ₹35,000	Fellowship	Research labs

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