Placement Papers — MCQ Practice Questions & Answers

Question 1

Statement: All managers are leaders. Some employees are managers. Conclusion: All employees are leaders.

Accepted Answer

Correct answer: C. Cannot be determined — Some employees are managers, but not all. So we cannot conclude that all employees are leaders.

Answer

A. Definitely true

Answer

B. Definitely false

Answer

D. Probably true

Question 2

What will be the output of the following code? int x = 5; int y = ++x + x++; System.out.println(y);

Accepted Answer

Correct answer: B. 12 — ++x makes x=6 (pre-increment). Then x++ uses 6 and increments to 7. So y = 6 + 6 = 12.

Answer

A. 11

Answer

C. 13

Answer

D. 14

Question 3

Which of the following is a characteristic of a good hash function?

Accepted Answer

Correct answer: D. All of the above — Good hash functions are deterministic (same input gives same output), uniformly distribute values, and minimize collisions.

Answer

A. Deterministic behavior

Answer

B. Uniform distribution

Answer

C. Collision resistance

Question 4

If a HashMap has 1000 entries and the load factor is 0.75, at what capacity will it resize?

Accepted Answer

Correct answer: C. 1333 — Resize occurs when entries exceed capacity × load factor. If 1000 entries at 0.75 load factor, capacity = 1000/0.75 = 1333

Answer

A. 750

Answer

B. 1000

Answer

D. Cannot be determined

Question 5

A system processes 1000 requests per second. If 8% of requests fail and need retry, and each retry takes 2 seconds, approximately how many total seconds are needed to process 10,000 requests including retries (assuming sequential processing)?

Accepted Answer

Correct answer: B. 11.6 seconds — 10,000 requests at 1000/sec = 10 seconds. Failed requests = 10,000 × 0.08 = 800. Retry time = 800 × 2/1000 = 1.6 seconds. Total ≈ 10 + 1.6 = 11.6 seconds.

Answer

A. 10 seconds

Answer

C. 12.5 seconds

Answer

D. 13.8 seconds

Placement Papers - MCQ Practice Questions