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Mathematics · JEE | THREE DIMENSIONAL GEOMETRY

हिन्दी

Match List-I with List-II: List-I (Line / Parameter) List-II (Value / Form) A Direction ratios of line \( \frac{x-5}{3} = \frac{y+4}{7} = \frac{z-6}{2} \) I \( \frac{\sqrt{293}}{7} \) B Distance between lines \( \vec{r} = (\hat{i}+2\hat{j}-4\hat{k})+\lambda(2\hat{i}+3\hat{j}+6\hat{k}) \) and \( \vec{r} = (3\hat{i}+3\hat{j}-5\hat{k})+\mu(2\hat{i}+3\hat{j}+6\hat{k}) \) II \( (3, 7, 2) \) C Value of \( k \) if lines with d.r. \( (-3, 2k, 2) \) and \( (3k, 1, -5) \) are perpendicular III \( -\frac{10}{7} \) D Shortest distance between lines with \( \vec{b}_1 \times \vec{b}_2 = 8\hat{i}+8\hat{j}+4\hat{k} \) and \( \vec{a}_2 - \vec{a}_1 = -10\hat{i}-2\hat{j}-3\hat{k} \) IV 9 Choose the correct answer from the options given below:

Match List-I with List-II:

List-I (Line / Parameter) List-II (Value / Form)
A Direction ratios of line \( \frac{x-5}{3} = \frac{y+4}{7} = \frac{z-6}{2} \) I \( \frac{\sqrt{293}}{7} \)
B Distance between lines \( \vec{r} = (\hat{i}+2\hat{j}-4\hat{k})+\lambda(2\hat{i}+3\hat{j}+6\hat{k}) \) and \( \vec{r} = (3\hat{i}+3\hat{j}-5\hat{k})+\mu(2\hat{i}+3\hat{j}+6\hat{k}) \) II \( (3, 7, 2) \)
C Value of \( k \) if lines with d.r. \( (-3, 2k, 2) \) and \( (3k, 1, -5) \) are perpendicular III \( -\frac{10}{7} \)
D Shortest distance between lines with \( \vec{b}_1 \times \vec{b}_2 = 8\hat{i}+8\hat{j}+4\hat{k} \) and \( \vec{a}_2 - \vec{a}_1 = -10\hat{i}-2\hat{j}-3\hat{k} \) IV 9

Choose the correct answer from the options given below:

  1. A
    A-(II), B-(I), C-(IV), D-(III)
  2. B
    A-(II), B-(I), C-(III), D-(IV)
  3. C
    A-(I), B-(II), C-(III), D-(IV)
  4. D
    A-(III), B-(I), C-(II), D-(IV)
View Answer & Solution

Correct answer · Option B

A-(II), B-(I), C-(III), D-(IV)

Explanation

A matches with II (direction ratios are denominators: 3, 7, 2). B matches with I (distance formula gives \( \frac{\sqrt{293}}{7} \)). C matches with III (\( -9k + 2k - 10 = 0 \implies k = -\frac{10}{7} \)). D matches with IV (\( |-108|/12 = 9 \)).
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