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NDA 2026
Exam
NDA
Year
2026
Subject
Mathematics
Chapter
Three Dimensional Geometry

NDA 2026 · Mathematics · Three Dimensional Geometry

Passage: A line L passing through the point (-1,2,-3) is...

Passage: A line LL passing through the point (−1,2,−3)(-1,2,-3) is perpendicular to the plane PP given by 2x+3y+z+5=02x+3y+z+5=0.

Question: What are the direction ratios of a line MM parallel to the plane PP ?

Options

  1. A⟨−3,2,1⟩\langle-3,2,1\rangle
  2. B⟨3,2,−6⟩\langle3,2,-6\rangle
  3. C⟨1,3,2⟩\langle1,3,2\rangle
  4. D⟨2,2,−10⟩\langle2,2,-10\rangle

Correct answer

D. ⟨2,2,−10⟩\langle2,2,-10\rangle

Step-by-step solution

The plane PP is given by 2x+3y+z+5=02x + 3y + z + 5 = 0.

The direction ratios of the normal to the plane PP are ⟨2,3,1⟩\langle 2, 3, 1 \rangle.

Since the line MM is parallel to the plane PP, its direction vector must be perpendicular to the normal vector of the plane.

Let the direction ratios of the line MM be ⟨a,b,c⟩\langle a, b, c \rangle.

Then, 2a+3b+c=02a + 3b + c = 0.

Checking the given options:

For ⟨−3,2,1⟩\langle -3, 2, 1 \rangle, 2(−3)+3(2)+1=1≠02(-3) + 3(2) + 1 = 1 \neq 0

For ⟨3,2,−6⟩\langle 3, 2, -6 \rangle, 2(3)+3(2)−6=6≠02(3) + 3(2) - 6 = 6 \neq 0

For ⟨1,3,2⟩\langle 1, 3, 2 \rangle, 2(1)+3(3)+2=13≠02(1) + 3(3) + 2 = 13 \neq 0

For ⟨2,2,−10⟩\langle 2, 2, -10 \rangle, 2(2)+3(2)−10=02(2) + 3(2) - 10 = 0

Thus, the direction ratios of the line MM can be ⟨2,2,−10⟩\langle 2, 2, -10 \rangle.

Answer: ⟨2,2,−10⟩\langle2,2,-10\rangle
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