Determinant Using Matrices MCQs Practice
Determinant Using Matrices MCQs Practice
Class: CBSE Class 12 Mathematics
Subject: Mathematics
Section: Matrices
Topic: Determinant Using Matrices
Board: CBSE Board Examinations
Subject: Mathematics
Section: Matrices
Topic: Determinant Using Matrices
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. Determinant is defined only for:
Answer: C
Explanation: Determinant requires equal rows and columns.
Explanation: Determinant requires equal rows and columns.
Q2. Determinant of identity matrix is:
Answer: B
Explanation: Product of diagonal ones.
Explanation: Product of diagonal ones.
Q3. If any row is zero, determinant is:
Answer: B
Explanation: Zero row ⇒ determinant zero.
Explanation: Zero row ⇒ determinant zero.
Q4. Interchanging two rows changes determinant:
Answer: B
Explanation: Property of determinants.
Explanation: Property of determinants.
Q5. If two rows identical, determinant:
Answer: B
Explanation: Linearly dependent rows.
Explanation: Linearly dependent rows.
Q6. Determinant of triangular matrix equals:
Answer: B
Explanation: Property of triangular matrices.
Explanation: Property of triangular matrices.
Q7. If determinant = 0, matrix is:
Answer: A
Explanation: Non‑invertible matrix.
Explanation: Non‑invertible matrix.
Q8. If determinant ≠ 0, matrix is:
Answer: B
Explanation: Invertible matrix.
Explanation: Invertible matrix.
Q9. Determinant of transpose equals:
Answer: A
Explanation: |Aᵀ| = |A|.
Explanation: |Aᵀ| = |A|.
Q10. Determinant of product AB equals:
Answer: B
Explanation: Multiplicative property.
Explanation: Multiplicative property.
Q11. Determinant of scalar multiple kA:
Answer: C
Explanation: n = order of matrix.
Explanation: n = order of matrix.
Q12. Expansion method commonly used:
Answer: A
Explanation: Cofactor expansion.
Explanation: Cofactor expansion.
Q13. Minor obtained by:
Answer: A
Explanation: Definition of minor.
Explanation: Definition of minor.
Q14. Cofactor =
Answer: B
Explanation: Sign factor applied.
Explanation: Sign factor applied.
Q15. Determinant geometrically represents:
Answer: A
Explanation: Linear transformation scale.
Explanation: Linear transformation scale.
Q16. If rows proportional, determinant:
Answer: B
Explanation: Linear dependence.
Explanation: Linear dependence.
Q17. Determinant unchanged by:
Answer: A
Explanation: Adding multiple of row doesn’t change determinant.
Explanation: Adding multiple of row doesn’t change determinant.
Q18. Determinant of 1×1 matrix equals:
Answer: A
Explanation: Single value determinant.
Explanation: Single value determinant.
Q19. Determinant helps find:
Answer: D
Explanation: Multiple applications.
Explanation: Multiple applications.
Q20. If |A|=0, inverse:
Answer: B
Explanation: Singular matrices non‑invertible.
Explanation: Singular matrices non‑invertible.