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Straight Lines — NEET Maths MCQs

30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.

30questions
10/14/6easy / medium / hard
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Sample questions from this chapter

What is the slope of the line through (1, 2) and (3, 6)?
  1. 2 ✓
  2. 1/2
  3. 4
  4. −2
Answer: A. The slope is (6 − 2)/(3 − 1) = 4/2 = 2.
Why not B: This reverses the slope ratio, using change in x divided by change in y.
Why not C: This takes only the change in y and omits division by the change in x.
Why not D: Both coordinate changes have the same sign, so their ratio is positive rather than negative.
What is the slope of 2x + 3y − 6 = 0?
  1. 2/3
  2. −3/2
  3. −2/3 ✓
  4. 3/2
Answer: C. Rearranging gives y = −(2/3)x + 2, so the slope is −2/3.
Why not A: This uses the correct coefficient ratio but misses the negative sign introduced when isolating y.
Why not B: This takes the negative reciprocal, which is the slope of a perpendicular line.
Why not D: This both reverses the ratio and drops the sign.
The lines 2x + y − 3 = 0, 5x + ky − 3 = 0, and 3x − y − 2 = 0 are concurrent. What is k?
  1. −2 ✓
  2. 2
  3. −5
  4. 5
Answer: A. The first and third lines intersect at (1,1). Substitution in 5x + ky − 3 = 0 gives 5 + k − 3 = 0, so k = −2.
Why not B: This moves the known terms across the equation but loses the negative sign required for k.
Why not C: This uses the x-coefficient 5 itself instead of substituting the common intersection point.
Why not D: This assumes the coefficient of y must match the coefficient of x for concurrency.

These are 3 of the 30 questions in the test. Take the full chapter test →

Read the chapter first

Every NCERT question in this chapter is solved, free: NCERT solutions — Straight Lines →

Other NEET Maths chapters

SetsRelations and FunctionsTrigonometric FunctionsComplex Numbers and Quadratic EquationsLinear InequalitiesPermutations and Combinations

All 27 chapters →

Questions

How many NEET questions are there on Straight Lines?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 11 chapter.

Is this NEET Maths chapter test free?

Yes. Every chapter test is free with no login, and you get your all-India rank on every one. Nothing on the site is on sale right now.

Do the questions explain the wrong options?

Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.