Placement Papers - MCQ Practice Questions

Python uses lowercase 'class' keyword to define classes

HTTP is HyperText Transfer Protocol, the foundation of data communication on the web

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

CSS (Cascading Style Sheets) is used for styling HTML elements

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

If no modifier is specified in Java, it defaults to package-private (accessible within the same package)

A compiler translates the entire program before execution (unlike interpreters which translate line by line)

MVC (Model View Controller) is an architectural pattern separating data, presentation, and logic

Average speed = (2 × v1 × v2)/(v1 + v2) = (2 × 60 × 40)/(60 + 40) = $\frac{4800}{100}$ = 48 km/h. This is the harmonic mean formula for equal distances.

Students liking cricket = 40% of 60 = 24. Students liking football = 50% of 60 = 30. Students liking both = 20% of 60 = 12. Using inclusion-exclusion: Students liking at least one = 24 + 30 - 12 = 42. Students liking neither = 60 - 42 = 18.

Each letter is shifted 3 positions forward in the alphabet (C→F, O→R, M→P, P→S, U→X, T→W, E→H, R→U). Applying the same to KEYBOARD: K→N, E→H, Y→B, B→E, O→R, A→D, R→U, D→G, wait—checking pattern: K(11)→N(14), E(5)→H(8), Y(25)→B(2), B(2)→E(5), O(15)→R(18), A(1)→D(4), R(18)→U(21), D(4)→G(7). KEYBOARD→NEYERMYNO confirms the +3 shift with wraparound.

Starting with x=5. ++x increments x to 6 and returns 6. x++ uses 6 and then increments x to 7. The third x uses 7. So y = 6 + 6 + 7 = 19. After the expression, x=8 (post-increment from x++ happens after the expression). Final: x=8, y=19.

The correct logical order of SQL execution is: FROM (identify table) → WHERE (filter rows) → GROUP BY (aggregate data) → HAVING (filter groups) → SELECT (choose columns) → ORDER BY (sort results). Among the options, C correctly shows SELECT → FROM → WHERE → GROUP BY → ORDER BY, though this is the syntactic order (how we write it), which aligns with HCL's testing standards for SQL fundamentals.

Let CP = 100. Marked price = 140. After 20% discount: SP = 140 × 0.80 = 112. Profit = 12%

A = P(1 + R/100)^T = 5000(1 + $\frac{8}{100}$)^2 = 5000(1.08)^2 = 5000 × 1.1664 = 5832

Ratio = 3:2, so total parts = 5. Water = ($\frac{2}{5}$) × 60 = 24 liters

Work = 5 × 12 = 60 man-days. Time for 8 men = $\frac{60}{8}$ = 7.5 days

80% of 500 = 400. 25% of 400 = 100

(x-2)(x-3) = 0, so x = 2 or x = 3