Which of the following statements are true?
(A) The vector equation of the line through the point (5, 2, -4) and parallel to the vector 3i^+2j^−8k^ is r=(5i^+2j^−4k^)+λ(3i^+2j^−8k^)
(B) Vector form of the equation of line 3x−5=7y+4=2z−6 is r=(5i^−4j^+6k^)+λ(3i^+7j^+2k^)
(C) The direction cosines of z-axis are (1, 1,0).
(D) If a line has direction ratios 2, -1, -2, then its direction cosines are -2/3, -1/3, -2/3.
Choose the correct answer from the options given below:
Held on 26 May 2025 · Verified 13 Jul 2026.
(A), (B) and (C) only
(B), (C) and (D) only
(A) and (B)only
(C) and (D) only
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The shortest distance between the following lines: $\vec{r} = (\hat{i} + \hat{j} - \hat{k}) + s(2\hat{i} + \hat{j} + \hat{k})$ $\vec{r} = (\hat{i} + \hat{j} + 2\hat{k}) + t(4\hat{i} + 2\hat{j} + 2\hat{k})$, where s and t are scalars, is:
The angle between the line $2x = 3y = z$ and $x$- axis is:
The angle at which the line, $\frac{x-1}{0} = \frac{2-y}{-1} = \frac{2z-3}{-2}$ is inclined with the positive direction of z-axis is
$\sin^{-1}(\cos\frac{3\pi}{5})$ equals
If lines $\frac{x+5}{5\lambda+2} = \frac{4-2y}{10} = \frac{1-3z}{-3}$ and $\frac{x-2}{1} = \frac{1+2y}{4\lambda} = \frac{2+z}{3}$ are perpendicular, than value of '$\lambda$' is
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