Placement Papers - MCQ Practice Questions

A constructor is a special method called when an object is created to initialize its properties.

'==' is loose equality (compares value only), while '===' is strict equality (compares both value and type).

An interface is an abstract type that defines a set of methods that implementing classes must provide.

Machine Learning is a subset of AI that enables systems to learn from data and improve performance without explicit programming.

Unit testing involves testing individual units or components of code in isolation to ensure they work correctly.

Series follows n(n+1): 1×2=2, 2×3=6, 3×4=12, 4×5=20, 5×6=30, 6×7=42

a:b = 3:4, b:c = 5:6. Multiply first by 5 and second by 4: a:b = 15:20, b:c = 20:24. So a:b:c = 15:20:24

Using set theory: n(M∪S) = n(M) + n(S) - n(M∩S). 50 = 30 + 25 - n(M∩S). n(M∩S) = 5

(x + 1/x)² = x² + 2 + 1/x² = 7 + 2 = 9. So x + 1/x = ±3

After north and south movements (cancel out), he is only 3 km east of starting point

At 3:15, minute hand at 3 (90°), hour hand at 3 + $\frac{15}{60}$ × 30 = 97.5°. Difference = 7.5°

Since some doctors are teachers, and all teachers are educated, some doctors must be educated

R=6, O=9, S=1, E=8. So NOSE = 1-9-1-8 = 1918

Orange is a type of fruit. Shark is a type of fish. This is a classification relationship

First letter advances (A→B→C→D→E), second letter reverses (Z→Y→X→W→V)

PLUOITCMAC rearranged = COMPLIANT (meaning willing/agreeable)

Arrays allocate continuous memory blocks; linked lists use nodes scattered in memory

SaaS (Software as Service), PaaS (Platform as Service), IaaS (Infrastructure as Service) are main cloud models. DaaS is Data as Service but not standard

Quick sort has average time complexity O(n log n), better than bubble sort O(n²)

Encapsulation is bundling data (variables) and methods together while hiding implementation details