Adjoint and Inverse of Matrix MCQs
Adjoint and Inverse of Matrix MCQs
Class: CBSE Class 12 Mathematics
Subject: Mathematics
Section: Determinants
Topic: Adjoint and Inverse of Matrix
Board: CBSE Board Examinations
Subject: Mathematics
Section: Determinants
Topic: Adjoint and Inverse of Matrix
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. Adjoint of matrix is transpose of:
Answer: B
Explanation: adj(A) = transpose of cofactor matrix.
Explanation: adj(A) = transpose of cofactor matrix.
Q2. Inverse exists if determinant is:
Answer: C
Explanation: Non‑singular condition.
Explanation: Non‑singular condition.
Q3. Formula for inverse:
Answer: A
Explanation: A⁻¹ = adj(A)/|A|.
Explanation: A⁻¹ = adj(A)/|A|.
Q4. If |A|=0, inverse:
Answer: B
Explanation: Singular matrix.
Explanation: Singular matrix.
Q5. A·A⁻¹ =
Answer: B
Explanation: Identity property.
Explanation: Identity property.
Q6. adj(I) =
Answer: A
Explanation: Cofactors same as identity.
Explanation: Cofactors same as identity.
Q7. adj(Aᵀ) =
Answer: B
Explanation: Property of adjoint.
Explanation: Property of adjoint.
Q8. adj(AB) =
Answer: B
Explanation: Reverse order property.
Explanation: Reverse order property.
Q9. |A⁻¹| =
Answer: B
Explanation: Determinant reciprocal.
Explanation: Determinant reciprocal.
Q10. adj(A)A =
Answer: A
Explanation: Fundamental property.
Explanation: Fundamental property.
Q11. If A singular, adj(A):
Answer: A
Explanation: Depends on cofactors.
Explanation: Depends on cofactors.
Q12. Inverse of identity:
Answer: A
Explanation: Self inverse.
Explanation: Self inverse.
Q13. adj(kA) =
Answer: C
Explanation: n = order.
Explanation: n = order.
Q14. If A invertible, adj(A⁻¹) =
Answer: A
Explanation: Property relation.
Explanation: Property relation.
Q15. Inverse geometrically represents:
Answer: A
Explanation: Undo transformation.
Explanation: Undo transformation.
Q16. If A orthogonal, A⁻¹ =
Answer: A
Explanation: Orthogonal property.
Explanation: Orthogonal property.
Q17. adj(adj(A)) =
Answer: A
Explanation: Higher adjoint property.
Explanation: Higher adjoint property.
Q18. Inverse exists only for:
Answer: A
Explanation: Determinant defined.
Explanation: Determinant defined.
Q19. If |A|=1, inverse equals:
Answer: A
Explanation: From formula.
Explanation: From formula.
Q20. A·adj(A) =
Answer: A
Explanation: Fundamental identity.
Explanation: Fundamental identity.