Aptitude
Drills
IOCL placement papers 2024
Overview
Section titled “Overview”IOCL placement papers 2024. Primary filter: IOCL GATE-based Recruitment. Focus: GATE technical, GD/Interview.
IOCL 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
Reading Comprehension (2024 - Real Question)
According to the passage, a major consequence was a significant increase in urban populations due to migration for work opportunities.
Verbal
Problem: Choose the correct sentence: a) Neither the students nor the teacher were present b) Neither the students nor the teacher was present c) Neither the students or the teacher was present
With "neither...nor", the verb agrees with the subject closer to it. "Teacher" is singular, so "was" is correct.
Quantitative
Find the error: "Each of the students have completed their assignment."
"Each" is singular, so "has" should be used instead of "have", and "his or her" instead of "their".
Verbal
Choose correctly spelled word:
Correct spelling is Necessary.
Quantitative
A and B invest ₹5,000 and ₹7,000 respectively in a business. After 6 months, A withdraws ₹2,000. If the profit at the end of the year is ₹4,500, find B's share.
A's investment: 5000 × 6 + 3000 × 6 = 30,000 + 18,000 = 48,000 B's investment: 7000 × 12 = 84,000 Ratio = 48,000 : 84,000 = 4 : 7 B's share = 7/(4+7) × 4500 = 7/11 × 4500 = ₹2,863.64
Reasoning
Statements: 1) Some boxes are cars, 2) Some cars are roads Conclusions: I) Some roads are boxes, II) Some cars are boxes, III) No box is a road, IV) Some roads are cars.
Correct answer: Only II and IV follow
Reasoning
Find the next number: 1, 3, 6, 10, 15, ?
Correct answer: 21
Verbal
A person who speaks many languages is a:
Polyglot speaks several languages.
Reasoning
A walks 10m North, turns right walks 5m, turns right walks 10m. Direction from start?
Correct answer: East (5m east of starting point)
Quantitative
A 120 m train crosses a pole in 8 s. Speed in km/h is:
Speed = 120/8 = 15 m/s = 54 km/h.
Reasoning
Number Series - 37, 47, 58, ?, 79, 95
Correct answer: 70
Verbal
He _____ to school every day.
Singular present.
Quantitative
A number is first increased by 25% and then decreased by 20%. Find the net percentage change.
Let number = 100 After 25% increase: 100 + 25 = 125 After 20% decrease: 125 - 20% of 125 = 125 - 25 = 100 Net change = 0%
Reasoning
Find the next number: 5, 10, 20, 40, ?
×2 each → 80.
Quantitative
The ratio of the ages of two persons is 4:3. After 6 years, the ratio becomes 9:7. What are their present ages?
Let present ages be 4x and 3x After 6 years: (4x + 6)/(3x + 6) = 9/7 7(4x + 6) = 9(3x + 6) 28x + 42 = 27x + 54 x = 12 Present ages: 4×12 = 48 years, 3×12 = 36 years
Your score
0/15(0%)
Review
Sample IOCL Questions with Solutions
Section titled “Sample IOCL Questions with Solutions”Practice-style questions (not leaked live papers).
Aptitude / Reasoning
Section titled “Aptitude / Reasoning”Q1: Average of 5 numbers is 20. One number 30 replaced by 10. New average?
Answer: 16
Explanation: Sum 100 -> 80; avg 16.
Q2: A finishes in 10 days, B in 15. Together?
Answer: 6 days
Explanation: 1/10+1/15=1/6.
Q3: Probability of drawing an ace from a deck?
Answer: 1/13
Explanation: 4/52=1/13.
Q4: Pipe A fills in 6h, B in 8h. Together to fill?
Answer: 24/7 hours
Explanation: 1/6+1/8=7/24.
Q5: CP Rs.500, SP Rs.600. Profit percent?
Answer: 20%
Explanation: (100/500)*100=20%.
Q6: Find next: 2, 6, 12, 20, 30, ?
Answer: 42
Explanation: n(n+1) pattern.
Q7: 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.
Q8: 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.
Coding Practice
Section titled “Coding Practice”Coding Q1: Longest substring without repeat
Approach: Sliding window + last index.
Complexity: O(n)
IOCL tip: Narrate brute force then optimize then edge cases before coding.
Coding Q2: Merge intervals
Approach: Sort + merge.
Complexity: O(n log n)
IOCL tip: Narrate brute force then optimize then edge cases before coding.
Coding Q3: Top K frequent
Approach: Count + heap.
Complexity: O(n log k)
IOCL tip: Narrate brute force then optimize then edge cases before coding.
Coding Q4: Linked list cycle
Approach: Floyd tortoise-hare.
Complexity: O(1) space
IOCL tip: Narrate brute force then optimize then edge cases before coding.
Coding Q5: Level order traversal
Approach: BFS queue.
Complexity: O(n)
IOCL tip: Narrate brute force then optimize then edge cases before coding.
Coding Q6: Coin change min coins
Approach: DP unbounded.
Complexity: O(amount*coins)
IOCL tip: Narrate brute force then optimize then edge cases before coding.
Coding Q7: Binary search
Approach: Lo/hi mid.
Complexity: O(log n)
IOCL tip: Narrate brute force then optimize then edge cases before coding.
Coding Q8: Kadane max subarray
Approach: Running best.
Complexity: O(n)
IOCL tip: Narrate brute force then optimize then edge cases before coding.
Coding Q9: Reverse a string in-place
Approach: Two pointers from ends.
Complexity: O(n)/O(1)
IOCL tip: Narrate brute force then optimize then edge cases before coding.
Coding Q10: Check prime
Approach: Trial division to sqrt(n).
Complexity: Handle n<2
IOCL tip: Narrate brute force then optimize then edge cases before coding.
Deep Prep Notes for IOCL
Section titled “Deep Prep Notes for IOCL”How the IOCL GATE-based Recruitment Usually Feels
Section titled “How the IOCL GATE-based Recruitment Usually Feels”Candidates describe a paced filter where easy marks disappear if you over-invest in one hard item. For IOCL, 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 IOCL |
|---|---|
| GATE technical | Primary shortlist signal |
| Core CS (OOPs/DBMS/OS) | Technical interview depth |
| Oil Refining & Marketing 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
IOCL