Class 11 Math: Straight Lines Important Exam Questions

Preparing for school exams or final CBSE boards requires practicing questions patterned after official grading schemes. We have compiled a list of crucial questions for Class 11 Straight Lines to help you test your mastery.

Exam-Pattern Questions and Answers

Question 1 (EASY)

• Option 1: L
• Option 2: L
• Option 3: L
• Option 4: L

Solution Explanation & Steps: (b), as z -coordinates is zero in XY plane, y -coordinate is zero is XZ-plane, x coordinate is zero in YZ-plane. L(3, 4, 0), M(3, 0, 6), N(0, 4, 6) ASSERTION-REASON BASED QUESTIONS In the following questions, a statement of assertion (A) is followed by a statement of Reason (R). Choose the correct answer out of the following choices. (a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A). (b) Both Assertion (A) and Reason (R) are true and Reason (R) is not the correct explanation of Assertion (A). (c) Assertion (A) is true but Reason (R) is false. (d) Assertion (A) is false but Reason (R) is true.

Question 2 (EASY)

• Option 1: 7
• Option 2: 8
• Option 3: 9
• Option 4: 10

Solution Explanation & Steps: Let A(3, y ), B(2, 7), C(-1, 4) and D(0, 6) be the given points. Then, m1 = Slope of the line AB = 7 72 3 y y- = -- and m2 = Slope of the line CD = 6 4 20 ( 1) - =- - Since, AB and CD are parallel. ∴ m1 = m2 ⇒ y - 7 = 2 ⇒ y = 9

Question 3 (EASY)

• Option 1: Systematic application of coordinate rules
• Option 2: Advanced integral equations
• Option 3: Infinite boundary coordinates
• Option 4: None of the above

Solution Explanation & Steps: Studying Slope of a line requires mastering basic coordinate relationships first.

Grading Step-Marking Guidelines

Remember that teachers award partial marks for writing down formulas, stating the given variables, and drawing diagrams. Never leave a question blank on an exam. Write down the relevant formulas and initial substitution steps to secure partial credits.