NCERT Linear Equations MCQs – Consistency of System of Equations
CBSE Class 10 Mathematics – Consistency of Pair of Linear Equations MCQs
Chapter 3: Pair of Linear Equations in Two Variables
Topic: Consistency of System of Equations
Based on NCERT | As per Latest CBSE Board Examination Pattern
1. A pair of linear equations is consistent if it has:
Correct Answer: B
Explanation: A system is consistent if it has at least one solution (unique or infinite).
Explanation: A system is consistent if it has at least one solution (unique or infinite).
2. If a1/a2 ≠ b1/b2, the system is:
Correct Answer: B
Explanation: Different ratios of coefficients mean lines intersect at one point ⇒ unique solution.
Explanation: Different ratios of coefficients mean lines intersect at one point ⇒ unique solution.
3. If a1/a2 = b1/b2 ≠ c1/c2, system is:
Correct Answer: B
Explanation: Same slope but different intercept ⇒ parallel lines ⇒ no solution ⇒ inconsistent.
Explanation: Same slope but different intercept ⇒ parallel lines ⇒ no solution ⇒ inconsistent.
4. If a1/a2 = b1/b2 = c1/c2, system is:
Correct Answer: C
Explanation: All ratios equal ⇒ coincident lines ⇒ infinite solutions.
Explanation: All ratios equal ⇒ coincident lines ⇒ infinite solutions.
5. Inconsistent system means:
Correct Answer: C
Explanation: Inconsistent system has no solution.
Explanation: Inconsistent system has no solution.
6. Consistent independent system has:
Correct Answer: A
Explanation: Independent lines intersect at exactly one point.
Explanation: Independent lines intersect at exactly one point.
7. Consistent dependent system has:
Correct Answer: C
Explanation: Dependent equations represent same line ⇒ infinite solutions.
Explanation: Dependent equations represent same line ⇒ infinite solutions.
8. Graph of inconsistent system shows:
Correct Answer: C
Explanation: Parallel lines never meet ⇒ no solution.
Explanation: Parallel lines never meet ⇒ no solution.
9. Graph of consistent independent system shows:
Correct Answer: B
Explanation: Intersecting lines give one solution.
Explanation: Intersecting lines give one solution.
10. If elimination leads to 0 = 7, system is:
Correct Answer: C
Explanation: False statement ⇒ no solution.
Explanation: False statement ⇒ no solution.
11. If elimination leads to 0 = 0, system is:
Correct Answer: B
Explanation: True identity ⇒ equations are dependent ⇒ infinite solutions.
Explanation: True identity ⇒ equations are dependent ⇒ infinite solutions.
12. A system having exactly one solution is:
Correct Answer: C
Explanation: Independent equations intersect at one point.
Explanation: Independent equations intersect at one point.
13. If slopes are equal and intercepts equal, lines are:
Correct Answer: B
Explanation: Same slope and intercept ⇒ same line.
Explanation: Same slope and intercept ⇒ same line.
14. Maximum number of solutions of pair of linear equations is:
Correct Answer: C
Explanation: Coincident lines give infinite solutions.
Explanation: Coincident lines give infinite solutions.
15. Minimum number of solutions is:
Correct Answer: A
Explanation: Parallel lines ⇒ no solution.
Explanation: Parallel lines ⇒ no solution.
16. System is consistent if graphical representation shows:
Correct Answer: A
Explanation: Common point means at least one solution.
Explanation: Common point means at least one solution.
17. If coefficients are proportional but constants not, lines are:
Correct Answer: C
Explanation: Proportional coefficients but different constants ⇒ parallel lines.
Explanation: Proportional coefficients but different constants ⇒ parallel lines.
18. A consistent system always has:
Correct Answer: B
Explanation: It may have unique or infinite solutions.
Explanation: It may have unique or infinite solutions.
19. If two lines overlap completely, system is:
Correct Answer: B
Explanation: Overlapping lines ⇒ dependent ⇒ infinite solutions.
Explanation: Overlapping lines ⇒ dependent ⇒ infinite solutions.
20. A pair of linear equations can be classified into:
Correct Answer: C
Explanation: Depending on ratios, system can be consistent or inconsistent.
Explanation: Depending on ratios, system can be consistent or inconsistent.
