🧭 Introduction

ONGC is India’s leading upstream oil & gas public sector enterprise, engaged in exploration, production and development of hydrocarbons. It offers attractive engineering & geoscience job opportunities (for example, posts like Assistant Executive Engineer (AEE), Geologist, Geophysicist etc.) as well as technical/trade/non‑executive roles. This guide covers the latest ONGC recruitment cycle (2025) – including selection process, exam pattern, detailed syllabus, weightages, practical preparation tips and useful resources.

✅ Selection Process

The selection process for ONGC technical/executive posts generally involves:

Online Application & Screening – Checking eligibility (education, age, discipline, marks) as per advertisement.
Computer Based Test (CBT) – For many posts this is the first stage: domain knowledge + general awareness/aptitude/English
Interview / Personal Interaction – Shortlisted candidates are called for interview; final merit list is based on CBT + interview.
Final Selection & Appointment – Merit list published; selected candidates undergo document verification, medical examination & join.

📘 Exam Pattern

🧮 Pattern for Engineering / Geoscience Posts (e.g., AEE, Geologist, Geophysicist)

Section	No. of Questions	Marks	Time
Domain Knowledge	40	40	— (within full test)
General Awareness	10	10	—
Aptitude Test	25	25	—
English Language	10	10	—
Total	85	85 marks	Typically 120 minutes (2 hours)

Notes:

There is no negative marking in many recent ONGC CBTs for these posts.
Qualifying marks vary by category.
Final merit is usually CBT (weightage) + Interview (weightage ~15 marks) in many posts.

📋 Pattern for Technician / Assistant / Non‑Executive Posts

Post Category	Written Test Marks	Duration	Remarks
Assistant/Technician A1/A2	~100 marks for written test (discipline + general aptitude)	~2 hours	Includes domain subject + general awareness/aptitude
Non‑Executive Posts	Varies (often technical trade + reasoning)	—	Negative marking may or may not apply

📚 Detailed Section‑wise Syllabus

1. Domain/Technical Knowledge (Engineering/Geoscience)

This section tests your core discipline knowledge. Some sample discipline‐wise topics:

Mechanical / Production / Petroleum Engineering: Thermodynamics, Heat Transfer, Fluid Mechanics, Strength of Materials, Theory of Machines, IC Engines, Manufacturing Processes, Machine Design, Industrial Engineering.

Electrical Engineering: Circuits & Networks, Power Systems, Electrical Machines, Control Systems, Power Electronics, Instrumentation & Measurements, Analog & Digital Electronics.

Chemical Engineering: Heat & Mass Transfer, Chemical Reaction Engineering, Process Calculations, Plant Design, Fluid Mechanics, etc.

Geology: General Geology, Structural Geology, Paleontology, Stratigraphy, Mineralogy, Petrology, Geochemistry, Hydrogeology, Indian Geology.

Geophysics: Solid Earth Geophysics, Seismology, Signal Processing, Gravimetry, Magnetics, Electromagnetic Methods, Borehole Geophysics, Remote Sensing, Seismic Data Processing.

2. General Awareness

Current Events – National & International especially in the energy/oil & gas sector.
Indian Economy, Science & Technology, Indian Constitution & Polity, Geography.
General knowledge of the industry, major policies, energy sector scenario etc.

3. Aptitude / Reasoning

Logical Reasoning: Series, Coding‑Decoding, Venn Diagrams, Spatial Visualization, etc.
Quantitative Aptitude: Number systems, Averages, Ratio & Proportion, Time & Work, Percentages, Data Interpretation.
English Language: Grammar, Vocabulary, Reading Comprehension, Sentence Correction.

4. Professional Knowledge / Trade Subject (For Technician Level)

For trade/technician posts (e.g., Assistant Technician A1/A2), domain/trade specific topics plus general across domains. For example:

Professional Knowledge: Electrical trade, Mechanical trade, Electronics trade based on the discipline
General Mental Ability & Reasoning.

🔍 Final Selection & Marks Weightage

For many executive/engineering posts in ONGC: Final merit is based on CBT + Interview. Example: CBT marks + Interview marks (e.g., Interview weightage ~15 marks) for engineering/geoscience posts.
Tie‑breaking criteria: Higher CBT score is preferred; if still tie, older candidate is given preference.
For Technician / Assistant posts: Final merit is often based on written test + academic performance/apprenticeship/trade test.
Minimum qualifying marks: For example, for engineering posts General/EWS/OBC may require 45%, SC/ST/PwBD 40%.

💡 Practical Preparation Tips

Download the official notification & syllabus for your post from ONGC website; note exactly which discipline/trade you’re applying for and pattern. Prep Images
Focus on core technical/discipline topics: For example if Mechanical, concentrate on Thermodynamics, Fluid Mechanics, Strength of Materials; if Geology, focus on mapping, stratigraphy etc.
Practice domain questions: Use previous year papers, mock tests for ONGC CBT pattern to understand question style and difficulty.
General Awareness & Aptitude cannot be ignored: Though smaller in number, they can make difference. Stay updated on energy sector current affairs, national/international oil & gas developments.
Time management & speed: You may have ~85 questions in 2 hours; practice solving in timed mode.
Accuracy over blind guessing: Even though there is no negative marking in many recent ONGC exams, aim for accuracy – avoid wasting time on ultra‑difficult questions.
Revision notes: Maintain quick‑review notes on formulas, important concepts, trade‑specific key points, current affairs.
Mock tests & analysis: After each test, analyse mistakes, identify weak areas and revisit concept accordingly.
Interview preparation (for engineering/exec posts): Be ready to discuss your academic projects, specialization branch, what you know about ONGC’s operations, energy sector, challenges in upstream oil & gas.
Stay consistent & healthy: Balanced study plan, breaks, adequate sleep, and physical health are important for optimum performance.

🔗 Useful Resource Links

Official Information Handout for Engineering & Geoscience disciplines at E1 level: ONGC Information Handout PDF Advt. 1/2025 (R&P) ONGC India

Oil and Natural Gas Corporation - Wikipedia

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📘 Exam Pattern

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