Aptitude
Drills
Persistent Systems placement papers 2024
Overview
Section titled “Overview”Persistent Systems placement papers 2024. Primary filter: Persistent Online Assessment. Focus: Coding, OOPs, DBMS, aptitude.
Persistent Systems 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
Reasoning
All pens are books. Some books are papers. Conclusion: Some pens are papers.
No definite overlap between pens and papers.
Reasoning
In how many ways can 4 books be arranged on a shelf?
Correct answer: 24 ways
Quantitative
Compound interest on ₹1000 at 10% for 2 years (annual compounding):
1000×1.1² − 1000 = 210.
Verbal
Problem: "She is allergic _____ peanuts." a) to b) from c) with d) by
"Allergic to" is the correct prepositional phrase.
Quantitative
Pointing to a photograph, a man says, "She is the daughter of my grandfather's only son." How is the girl related to the man?
The man's grandfather's only son = the man's father Daughter of the man's father = the man's sister Therefore, the girl is the man's sister.
Quantitative
If cost price is ₹250 and profit is 20%, selling price is:
SP = 250 × 1.2 = ₹300.
Reasoning
How many 9s are there between 1 and 100?
9,19,29,39,49,59,69,79,89,90–99 → 20 nines.
Verbal
"Break the ice" means:
It means to initiate conversation in a social setting.
Quantitative
The average of 5 numbers is 20. If one number is removed, the average becomes 18. Find the removed number.
Correct answer: 28
Quantitative
A number is increased by 20% and then decreased by 20%. Find the net percentage change.
Let original = 100 After 20% increase: 120 After 20% decrease: 96 Net change = 4% decrease
Verbal
Choose the correctly spelled word:
Correct spelling is Accommodation.
Reasoning
Series: 1, 4, 9, 16, 25, ?
Perfect squares → 36.
Reasoning
Statements: 1. Some books are novels, 2. All novels are stories, 3. No story is a poem
From 1 and 2: Some books are stories (I follows) From 2 and 3: No novel is a poem (II follows) From I: Some stories are books (III follows)
Verbal
"To add fuel to the fire" means:
It means worsening a conflict or situation.
Quantitative
A and B finish a job in 12 and 18 days. Working together they finish in:
1/12 + 1/18 = 5/36 → 36/5 = 7.2 days.
Your score
0/15(0%)
Review
Sample Persistent Systems Questions with Solutions
Section titled “Sample Persistent Systems Questions with Solutions”Practice-style questions (not leaked live papers).
Aptitude / Reasoning
Section titled “Aptitude / Reasoning”Q1: If 30% of x = 150, x = ?
Answer: 500
Explanation: 0.3x=150 => x=500.
Q2: Average of 5 numbers is 20. One number 30 replaced by 10. New average?
Answer: 16
Explanation: Sum 100 -> 80; avg 16.
Q3: A finishes in 10 days, B in 15. Together?
Answer: 6 days
Explanation: 1/10+1/15=1/6.
Q4: Probability of drawing an ace from a deck?
Answer: 1/13
Explanation: 4/52=1/13.
Q5: Pipe A fills in 6h, B in 8h. Together to fill?
Answer: 24/7 hours
Explanation: 1/6+1/8=7/24.
Q6: CP Rs.500, SP Rs.600. Profit percent?
Answer: 20%
Explanation: (100/500)*100=20%.
Q7: Find next: 2, 6, 12, 20, 30, ?
Answer: 42
Explanation: n(n+1) pattern.
Q8: 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.
Coding Practice
Section titled “Coding Practice”Coding Q1: Kadane max subarray
Approach: Running best.
Complexity: O(n)
Persistent Systems tip: Narrate brute force then optimize then edge cases before coding.
Coding Q2: Reverse a string in-place
Approach: Two pointers from ends.
Complexity: O(n)/O(1)
Persistent Systems tip: Narrate brute force then optimize then edge cases before coding.
Coding Q3: Check prime
Approach: Trial division to sqrt(n).
Complexity: Handle n<2
Persistent Systems tip: Narrate brute force then optimize then edge cases before coding.
Coding Q4: Valid parentheses
Approach: Stack matching.
Complexity: O(n)
Persistent Systems tip: Narrate brute force then optimize then edge cases before coding.
Coding Q5: Two Sum
Approach: Hash map complements.
Complexity: O(n)
Persistent Systems tip: Narrate brute force then optimize then edge cases before coding.
Coding Q6: Longest substring without repeat
Approach: Sliding window + last index.
Complexity: O(n)
Persistent Systems tip: Narrate brute force then optimize then edge cases before coding.
Coding Q7: Merge intervals
Approach: Sort + merge.
Complexity: O(n log n)
Persistent Systems tip: Narrate brute force then optimize then edge cases before coding.
Coding Q8: Top K frequent
Approach: Count + heap.
Complexity: O(n log k)
Persistent Systems tip: Narrate brute force then optimize then edge cases before coding.
Coding Q9: Linked list cycle
Approach: Floyd tortoise-hare.
Complexity: O(1) space
Persistent Systems tip: Narrate brute force then optimize then edge cases before coding.
Coding Q10: Level order traversal
Approach: BFS queue.
Complexity: O(n)
Persistent Systems tip: Narrate brute force then optimize then edge cases before coding.
Deep Prep Notes for Persistent Systems
Section titled “Deep Prep Notes for Persistent Systems”How the Persistent Online Assessment Usually Feels
Section titled “How the Persistent Online Assessment Usually Feels”Candidates describe a paced filter where easy marks disappear if you over-invest in one hard item. For Persistent Systems, start with a three-minute scan, mark certainty levels, and protect accuracy. Languages typically include Java, C++, Python.
Topic Weight Hints (Candidate-Reported)
Section titled “Topic Weight Hints (Candidate-Reported)”| Area | Why it matters at Persistent Systems |
|---|---|
| Coding | Primary shortlist signal |
| Core CS (OOPs/DBMS/OS) | Technical interview depth |
| Software Product Engineering 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
Persistent Systems