Mathematics · JEE | THREE DIMENSIONAL GEOMETRY
हिन्दीMatch 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:
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 (\( |-108|/12 = 9 \)).