Aptitude
Drills
ONGC placement papers 2025
Overview
Section titled “Overview”ONGC placement papers 2025. Primary filter: ONGC GATE-based Recruitment. Focus: GATE technical, interview.
ONGC Aptitude Mock Quiz
Timed placement-style MCQs with score and explanations after you submit. Use it to check speed and accuracy before the real test.
Questions15
Time10 min
Quantitative
Pointing to a photograph, a man said, "She is the daughter of my grandfather's only son." How is the man related to the person in the photograph?
Grandfather's only son = man's father Daughter of man's father = man's sister So the person is the man's sister
Quantitative
The average of 5 numbers is 20. If one number is removed, the average becomes 18. Find the removed number.
Correct answer: 28
Reasoning
All roses are flowers. Some flowers fade quickly. Conclusion: All roses fade quickly.
Only some flowers.
Verbal
Identify the correctly spelled word:
Accommodate has double "c" and double "m".
Quantitative
If the perimeter of a rectangle is 60 cm and its length is twice its breadth, find the area of the rectangle.
Let breadth = x cm, length = 2x cm Perimeter = 2(length + breadth) = 2(2x + x) = 6x = 60 x = 10 cm Length = 20 cm, Breadth = 10 cm Area = 20 × 10 = 200 cm²
Verbal
Choose the correct synonym for "Ephemeral":
"Ephemeral" means lasting for a very short time, temporary. "Temporary" is the synonym.
Reasoning
Odd one out: 121, 144, 169, 196, 225
Others are odd squares.
Quantitative
A, B, and C can complete a work in 10, 15, and 20 days respectively. If they work together, in how many days will they complete the work?
Correct answer: 4.62 days
Reasoning
A person walks 5 km north, then 3 km east, then 2 km south. How far and in which direction is he from the starting point?
Net north = 5 - 2 = 3 km Net east = 3 km Distance = √(3² + 3²) = √18 = 3√2 km Direction = Northeast
Verbal
Problem: "She is good _____ mathematics." a) at b) in c) on d) with
"Good at" is the correct prepositional phrase for skills.
Verbal
Synonym of "Meticulous":
Meticulous means detailed.
Reasoning
Odd one out: 8, 27, 64, 100, 125
Others are perfect cubes; 100 is not.
Reasoning
Odd one out: Triangle, Square, Circle, Rectangle
Circle has no straight sides.
Quantitative
Reading Comprehension - Main Idea (2025)
Correct answer: Renewable energy and its growing importance
Quantitative
If 3x + 5 = 20, then x equals:
3x = 15 → x = 5.
Your score
0/15(0%)
Review
Sample ONGC Questions with Solutions
Section titled “Sample ONGC Questions with Solutions”Practice-style questions (not leaked live papers).
Aptitude / Reasoning
Section titled “Aptitude / Reasoning”Q1: CP Rs.500, SP Rs.600. Profit percent?
Answer: 20%
Explanation: (100/500)*100=20%.
Q2: Find next: 2, 6, 12, 20, 30, ?
Answer: 42
Explanation: n(n+1) pattern.
Q3: A train 120 m long runs at 54 km/h. Time to pass a pole?
Answer: 8 seconds
Explanation: 54 km/h = 15 m/s; t = 120/15 = 8 s.
Q4: Ratio of ages A:B = 4:5. After 6 years = 6:7. A present age?
Answer: 12 years
Explanation: 4x+6 / 5x+6 = 6/7 => x=3 => A=12.
Q5: Simple interest on Rs.8000 at 10% for 2 years?
Answer: Rs.1600
Explanation: SI = PRT/100 = 1600.
Q6: If 30% of x = 150, x = ?
Answer: 500
Explanation: 0.3x=150 => x=500.
Q7: Average of 5 numbers is 20. One number 30 replaced by 10. New average?
Answer: 16
Explanation: Sum 100 -> 80; avg 16.
Q8: A finishes in 10 days, B in 15. Together?
Answer: 6 days
Explanation: 1/10+1/15=1/6.
Coding Practice
Section titled “Coding Practice”Coding Q1: Check prime
Approach: Trial division to sqrt(n).
Complexity: Handle n<2
ONGC tip: Narrate brute force then optimize then edge cases before coding.
Coding Q2: Valid parentheses
Approach: Stack matching.
Complexity: O(n)
ONGC tip: Narrate brute force then optimize then edge cases before coding.
Coding Q3: Two Sum
Approach: Hash map complements.
Complexity: O(n)
ONGC tip: Narrate brute force then optimize then edge cases before coding.
Coding Q4: Longest substring without repeat
Approach: Sliding window + last index.
Complexity: O(n)
ONGC tip: Narrate brute force then optimize then edge cases before coding.
Coding Q5: Merge intervals
Approach: Sort + merge.
Complexity: O(n log n)
ONGC tip: Narrate brute force then optimize then edge cases before coding.
Coding Q6: Top K frequent
Approach: Count + heap.
Complexity: O(n log k)
ONGC tip: Narrate brute force then optimize then edge cases before coding.
Coding Q7: Linked list cycle
Approach: Floyd tortoise-hare.
Complexity: O(1) space
ONGC tip: Narrate brute force then optimize then edge cases before coding.
Coding Q8: Level order traversal
Approach: BFS queue.
Complexity: O(n)
ONGC tip: Narrate brute force then optimize then edge cases before coding.
Coding Q9: Coin change min coins
Approach: DP unbounded.
Complexity: O(amount*coins)
ONGC tip: Narrate brute force then optimize then edge cases before coding.
Coding Q10: Binary search
Approach: Lo/hi mid.
Complexity: O(log n)
ONGC tip: Narrate brute force then optimize then edge cases before coding.
Deep Prep Notes for ONGC
Section titled “Deep Prep Notes for ONGC”How the ONGC GATE-based Recruitment Usually Feels
Section titled “How the ONGC GATE-based Recruitment Usually Feels”Candidates describe a paced filter where easy marks disappear if you over-invest in one hard item. For ONGC, start with a three-minute scan, mark certainty levels, and protect accuracy. Languages typically include N/A for core.
Topic Weight Hints (Candidate-Reported)
Section titled “Topic Weight Hints (Candidate-Reported)”| Area | Why it matters at ONGC |
|---|---|
| GATE technical | Primary shortlist signal |
| Core CS (OOPs/DBMS/OS) | Technical interview depth |
| Oil & Gas Exploration PSU awareness | Managerial / HR differentiation |
| Communication | Especially for consulting and client-facing GSIs |
14-Day Sprint
Section titled “14-Day Sprint”- Days 1-3: pattern familiarization + 2 sectional mocks
- Days 4-7: weak-topic closed practice
- Days 8-10: full mocks every other day
- Days 11-14: interview narration + light revision
Related
Section titled “Related”Coding
DSA
OA
Assessment
Hub
ONGC