System of Linear Equations Using Determinants MCQs
System of Linear Equations Using Determinants MCQs
Class: CBSE Class 12 Mathematics
Subject: Mathematics
Section: Determinants
Topic: System of Linear Equations Using Determinants
Board: CBSE Board Examinations
Subject: Mathematics
Section: Determinants
Topic: System of Linear Equations Using 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. Cramer’s Rule is used to solve:
Answer: B
Explanation: It solves simultaneous linear equations using determinants.
Explanation: It solves simultaneous linear equations using determinants.
Q2. System has unique solution if determinant Δ is:
Answer: B
Explanation: Non‑zero determinant ⇒ unique solution.
Explanation: Non‑zero determinant ⇒ unique solution.
Q3. If Δ = 0 and Δ₁ = Δ₂ = 0, system is:
Answer: B
Explanation: Infinite solutions.
Explanation: Infinite solutions.
Q4. If Δ = 0 but any Δᵢ ≠ 0:
Answer: B
Explanation: No solution exists.
Explanation: No solution exists.
Q5. Variable x =
Answer: B
Explanation: From Cramer’s rule.
Explanation: From Cramer’s rule.
Q6. Determinant formed by coefficients called:
Answer: C
Explanation: Main determinant.
Explanation: Main determinant.
Q7. Replacing x‑column gives:
Answer: A
Explanation: Determinant for x.
Explanation: Determinant for x.
Q8. Method applicable only when matrix is:
Answer: B
Explanation: Determinant defined.
Explanation: Determinant defined.
Q9. If Δ ≠ 0, system is:
Answer: B
Explanation: Unique solution.
Explanation: Unique solution.
Q10. Determinant method based on:
Answer: A
Explanation: Determinant evaluation.
Explanation: Determinant evaluation.
Q11. If all Δ = 0:
Answer: A
Explanation: Dependent system.
Explanation: Dependent system.
Q12. Determinant sign change implies:
Answer: A
Explanation: Ratio unaffected.
Explanation: Ratio unaffected.
Q13. Linear system represented as:
Answer: A
Explanation: Matrix equation form.
Explanation: Matrix equation form.
Q14. Inverse method uses:
Answer: A
Explanation: Alternative solution method.
Explanation: Alternative solution method.
Q15. Determinant zero implies matrix:
Answer: A
Explanation: Non‑invertible.
Explanation: Non‑invertible.
Q16. Unique solution count:
Answer: A
Explanation: Independent system.
Explanation: Independent system.
Q17. Determinant ratio gives:
Answer: A
Explanation: Cramer’s formula.
Explanation: Cramer’s formula.
Q18. If system inconsistent:
Answer: A
Explanation: Δ=0, Δᵢ≠0.
Explanation: Δ=0, Δᵢ≠0.
Q19. Determinant method valid for:
Answer: A
Explanation: Based on linear algebra.
Explanation: Based on linear algebra.
Q20. Δ represents:
Answer: A
Explanation: Main determinant.
Explanation: Main determinant.