Correct answer: Uniquely identifies each row in a table. Every table should have a unique row identifier — typically an auto-increment integer.

Programming MCQ

Correct answer: Content-Type: application/json before the encoded body. Correct content type lets clients parse responses reliably.

Correct answer: Directory traversal into files you never intended to serve. ../../etc/passwd-style names escape your intended directory.

Correct answer: Automatic class-name-to-file loading — the base of framework autoloading. Autoloaders remove manual require chains as projects grow.

Correct answer: Reading the full error message, then inspecting one suspect at a time. Systematic isolation converts mystery into procedure.

HTML, CSS, JavaScript, PHP and MySQL programming questions.

Q51. A PHP JSON endpoint must send: Medium

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Q52. Building file paths from user input risks: Medium

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Q53. spl_autoload_register provides: Medium

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Q54. The fastest debugging discipline is: Medium

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Q55. A PRIMARY KEY: Medium

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Q56. A FOREIGN KEY creates: Medium

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Q57. For storing money amounts you should use: Medium

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Q58. Which query returns the top 5 scores? Medium

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Q59. WHERE name LIKE 'Ram%' matches: Medium

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Q60. To find rows where email is missing, use: Medium

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