Class 12

THREE DIMENSIONAL GEOMETRY question bank (Maths)

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Q1.

The direction cosines of the normal to the plane $2x + 3y - 6z = 5$ are

(A)
$2, 3, -6$
(B)
$\frac{2}{7}, \frac{3}{7}, -\frac{6}{7}$
(C)
$\frac{2}{5}, \frac{3}{5}, -\frac{6}{5}$
(D)
None of these
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Q2.

If $\alpha, \beta, \gamma$ are the angles that a line makes with the positive direction of the coordinate axes,then $\sin^2 \alpha + \sin^2 \beta + \sin^2 \gamma =$

(A)
$2$
(B)
$1$
(C)
$3$
(D)
$0$
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