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Class 12 Computer Science — Chapter 5: Database Management and SQL
6 practice questions · 2 Easy · 2 Medium · 2 Hard
Free NCERT-aligned multiple-choice practice for Class 12 Computer Science, Chapter 5 (Database Management and SQL). Practise timed Easy, Medium and Hard quizzes with instant explanations — built for CBSE Board exams, JEE Main and NEET UG. Here are a few sample questions; sign in free to practise all 6.
Sample questions
Q1Easy
Primary key in a table is:
A.Unique non-null identifier✓ correct
B.Just any column
C.Random
D.Foreign reference
Why
Identifies each row.
Q2Medium
SELECT * FROM emp WHERE salary>50000 returns:
A.Rows where salary > 50000✓ correct
B.All rows
C.Only first row
D.None
Why
WHERE filters rows.
Q3Hard
Normalisation aims to:
A.Reduce redundancy and improve integrity✓ correct
B.Encrypt data
C.Compress data
D.Backup data
Why
Decompose to avoid anomalies.
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