Important Questions of Introduction To Three Dimensional Geometry Mathematics | Zigya

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31.

The shortest distance from the plane 12x + y + 3z = 327 to the sphere x2 + y2 + z2 + 4x - 2y - 6z = 155 is

  • 13

  • 26

  • 39

  • 41413


32.

If the vertices of a· triangle are A(0, 4, 1), B(2, 3, - 1) and C(4, 5, 0), then the orthocentre of ABC, is

  • (4, 5, 0)

  • (2, 3, - 1)

  • (- 2, 3, - 1)

  • (2, 0, 2)


33.

The normals at three points· P,Q and R of the parabola y2 = 4ax meet at (h, k). The centroid of the PQR lies on

  • x = 0

  • y = 0

  • x = - a

  • y = a


34.

A tower AB leans towards West making an angle α with the vertical. The angular elevation of B, the top most point of the tower is β as observed from a point C due East of A at a distance 'd' from A. If the angular elevation of B from a point D due East of C at a distance 2d from C is r, then 2tanα can be given as

  • 3cotβ - 2cotγ

  • 3cotγ - 2cotβ

  • 3cotβ - cotγ

  • cotβ - 3cotγ


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35.

The number of integral points (integral points means both the coordinates should be integer) exactly in the interior of the triangle with vertices (0, 0), (0, 21) and (21, 0) is

  • 133

  • 190

  • 233

  • 105


36.

The sides AB, BC and CA of a ABC have respectively 3, 4 and 5 points lying on them. number of triangles that can be constructed using these points as vertices is

  • 205

  • 220

  • 210

  • None of these


37.

P is a fixed point (a, a, a) on a line through the origin is equally inclined to the axes, then any plane through P perpendicular to Op, makes intercepts on the axes, the sum of whose reciprocal is equal to

  • a

  • 32a

  • 3a2

  • None of these


38.

The tangent at (1, 7) to the curve x2 = y - 6 touches the circle x2 + y2 + 16x + 12y + c = 0 at

  • (6, 7)

  • (- 6, 7)

  • (6, - 7)

  • (- 6, - 7)


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39.

In an equilateral triangle, the inradius, circumradius and one of the exradii are in the ratio

  • 2 : 3 : 5

  • 1 : 2 : 3

  • 1 : 3 : 7

  • 3 : 7 : 9


40.

The perimeter of the triangle with vertices at (1, 0, 0), (0, 1, 0) and (0, 0, 1) is

  • 3

  • 2

  • 22

  • 32


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