Placement Papers - MCQ Practice Questions

Git is used to track code changes, manage versions, and enable team collaboration

OOP (Object Oriented Programming) is a programming paradigm based on objects and classes

Python uses lowercase 'class' keyword to define classes

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

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

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.

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.