Objective Questions on Properties of Determinants
Objective Questions on Properties of Determinants
Class: CBSE Class 12 Mathematics
Subject: Mathematics
Section: Determinants
Topic: Properties of Determinants
Board: CBSE Board Examinations
Subject: Mathematics
Section: Determinants
Topic: Properties of Determinants
Board: CBSE Board Examinations
Instructions: These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 12 Board Examination standard practice.
Q1. If two rows are interchanged, determinant:
Answer: B
Explanation: Row swap reverses sign.
Explanation: Row swap reverses sign.
Q2. If two rows are equal, determinant:
Answer: B
Explanation: Linear dependence ⇒ zero.
Explanation: Linear dependence ⇒ zero.
Q3. Multiplying a row by k multiplies determinant by:
Answer: A
Explanation: Single row scaling property.
Explanation: Single row scaling property.
Q4. Adding multiple of one row to another:
Answer: C
Explanation: Elementary property.
Explanation: Elementary property.
Q5. Determinant of triangular matrix equals:
Answer: B
Explanation: Product of diagonal entries.
Explanation: Product of diagonal entries.
Q6. If one row all zeros:
Answer: B
Explanation: Zero row ⇒ determinant zero.
Explanation: Zero row ⇒ determinant zero.
Q7. |Aᵀ| equals:
Answer: A
Explanation: Transpose unchanged.
Explanation: Transpose unchanged.
Q8. |AB| =
Answer: B
Explanation: Multiplicative property.
Explanation: Multiplicative property.
Q9. If rows proportional:
Answer: B
Explanation: Linear dependence.
Explanation: Linear dependence.
Q10. Determinant of identity matrix:
Answer: B
Explanation: Product of diagonal ones.
Explanation: Product of diagonal ones.
Q11. Scaling two rows by k:
Answer: A
Explanation: Each row scaling multiplies determinant.
Explanation: Each row scaling multiplies determinant.
Q12. Determinant linear in:
Answer: C
Explanation: Linearity property.
Explanation: Linearity property.
Q13. If two columns equal:
Answer: B
Explanation: Same as rows property.
Explanation: Same as rows property.
Q14. Determinant of diagonal matrix:
Answer: B
Explanation: Diagonal product.
Explanation: Diagonal product.
Q15. Cofactor expansion called:
Answer: A
Explanation: Standard expansion.
Explanation: Standard expansion.
Q16. If determinant zero, matrix:
Answer: A
Explanation: Non‑invertible.
Explanation: Non‑invertible.
Q17. |kA| for n×n matrix:
Answer: C
Explanation: Order dependent.
Explanation: Order dependent.
Q18. Determinant unchanged by:
Answer: A
Explanation: Elementary operation.
Explanation: Elementary operation.
Q19. Determinant helps find:
Answer: D
Explanation: Multiple applications.
Explanation: Multiple applications.
Q20. If |A|=1, transformation preserves:
Answer: D
Explanation: Unit determinant property.
Explanation: Unit determinant property.