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Model Paper 2 — MATHS STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceMATHSModel Paper 21 Mark
Question
The straight line $\frac{x-2}{3}=\frac{y-3}{1}=\frac{z+1}{0}$ is
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Answer

(b) perpendicular to the $z$-axis
Explanation: It is perpendicular to z-axis.
Given, direction ratios of the line : $a_1=3, a_2=1, a_3=0$ & direction ratios of $z$-axis is $b_1=0, b_2=0, b_3=1$. Now, $a _1 a _2+ b _1 b_2+ c _1 c _2=3.0+1.0+0.1=0$ which implies that line is perpendicular to z -axis.

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