Matrix Multiplication MCQs Class 12
Matrix Multiplication MCQs Class 12
Class: CBSE Class 12 Mathematics
Subject: Mathematics
Section: Matrices
Topic: Matrix Multiplication
Board: CBSE Board Examinations
Subject: Mathematics
Section: Matrices
Topic: Matrix Multiplication
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. Product AB is defined if:
Answer: C
Explanation: Inner dimensions must match.
Explanation: Inner dimensions must match.
Q2. If A is 2×3 and B is 3×4, AB order:
Answer: A
Explanation: Rows of A × Columns of B.
Explanation: Rows of A × Columns of B.
Q3. Matrix multiplication is:
Answer: B
Explanation: Associative but not commutative.
Explanation: Associative but not commutative.
Q4. AI =
Answer: B
Explanation: Identity property.
Explanation: Identity property.
Q5. A0 =
Answer: B
Explanation: Zero multiplication.
Explanation: Zero multiplication.
Q6. (AB)ᵀ =
Answer: B
Explanation: Reverse transpose rule.
Explanation: Reverse transpose rule.
Q7. If AB=BA, matrices are:
Answer: B
Explanation: Called commuting matrices.
Explanation: Called commuting matrices.
Q8. Identity matrix order for 3×3 A:
Answer: B
Explanation: Must match order.
Explanation: Must match order.
Q9. Matrix multiplication distributive over:
Answer: C
Explanation: A(B±C)=AB±AC.
Explanation: A(B±C)=AB±AC.
Q10. If A is m×n, AA defined when:
Answer: A
Explanation: Must be square.
Explanation: Must be square.
Q11. (kA)B =
Answer: D
Explanation: Scalar associative.
Explanation: Scalar associative.
Q12. If AB=0, then:
Answer: C
Explanation: Zero product not unique.
Explanation: Zero product not unique.
Q13. Matrix multiplication uses:
Answer: A
Explanation: Dot product rule.
Explanation: Dot product rule.
Q14. If A is identity, AB =
Answer: B
Explanation: Identity property.
Explanation: Identity property.
Q15. If AB and BA both defined, orders imply:
Answer: A
Explanation: Inner dimensions match both ways.
Explanation: Inner dimensions match both ways.
Q16. Multiplication associative law:
Answer: A
Explanation: Associative property.
Explanation: Associative property.
Q17. If A invertible, AA⁻¹ =
Answer: A
Explanation: Inverse definition.
Explanation: Inverse definition.
Q18. Multiplication with diagonal matrix affects:
Answer: A
Explanation: Acts as scalar scaling.
Explanation: Acts as scalar scaling.
Q19. If A and B commute, AB=BA implies:
Answer: C
Explanation: Definition.
Explanation: Definition.
Q20. Matrix multiplication fundamental basis:
Answer: A
Explanation: Row‑column dot product.
Explanation: Row‑column dot product.