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CBSE Questions for Class 11 Engineering Maths Introduction To Three Dimensional Geometry Quiz 4 - MCQExams.com

The value(s) of λ, for which the triangle with vertices (6,10,10),(1,0,5) and (6,10,λ) will be a right angled triangle is/ are
  • 1
  • 703,0
  • 35
  • 0,703
If A(cosα,sinα,0),B(cosβ,sinβ,0)C(cosγ,sinγ,0) are vertices of ΔABC and let 
cosα+cosβ+cosγ=3asinα+sinβ+sinγ=3b, then correct matching of the following is:
List : I
List : II
A. Circumcentre
(3a,3b,0)
B. Centroid
(0,0,0)
C. Ortho centre
(a,b,0)
  • 4 3 2
  • 2 3 1
  • 1 2 3
  • 2 3 4
Arrange the points: A(1,23),B(1,2,3),C(1,23) and D(1,2,3) in the increasing order of their octant numbers:
  • A,B,C,D
  • B,C,D,A
  • C,D,A,B
  • D,C,B,A
P(0,5,6),Q(1,4,7),R(2,3,7) and S(3,5,16) are four points in the space. The point nearest to the origin O(0,0,0) is
  • P
  • Q
  • R
  • S
In the ΔABC, if AB=2;AC=20,B=(3,2,0) and C=(0,1,4), then the length of the median passing through A is
  • 32
  • 92
  • 32
  • 32
The extremities of a diagonal of a rectangular parallelopiped whose faces are parallel to the reference planes are (2,4,6) and (3,16,6). The length of the base diagonal is
  • 13
  • 13
  • 213
  • 169
Assertion (A): The points A(2,9,12),B(1,8,8),C(2,11,8)D(1,12,12) are the vertices of a rhombus
Reason (R): AB=BC=CD=DA and AC=BD
  • Both A and R are individually true and R is the correct explanation of A
  • Both A and R individually true but R is not the correct explanation of A
  • A is true but R is false
  • Both A and R false
If the plane a  2x3y+5Z2=0 divides the line segment joining (1,2,3) and (2,1,k) in the ratio 9:11, then k is
  • 1
  • 2
  • 10
  • 12
The point equidistant from the points (0,0,0),(1,0,0),(0,2,0) and (0,0,3) is
  • (1,2,3)
  • (12,1,32)
  • (12,1,32)
  • (1,2,3)
A point on the line x+21=y34=z122 at a distance 6 from the point (2, 3, 1) is
  • (421,1+122)
  • (45,95,1)
  • (165,395,51225)
  • (165,21,1+122)
If A(1,2,3),B(2,3,1),C(3,1,2) then the length  of the altitude through C is 
  • 3
  • 33
  • 32
  • 32
A plane intersects the co ordinate axes at A,B,C. If O=(0,0,0) and (1,1,1) is the centroid of the tetrahedron OABC, then the sum of the reciprocals of the intercepts of the plane
  • 12
  • 43
  • 1
  • 34
Assertion(A): If centroid and circumcentre of a triangle are known its orthocentre can be found.
Reason (R) : Centriod, orthocentre and circumcentre of a triangle are collinear
  • Both A and R are individually true and R is the correct explanation of A
  • Both A and R individually true but R is not the correct explanation of A
  • A is true but R is false
  • A is false but R is true
The plane ax+by+cz+(3)=0 meet the co-ordinate axes in A,B,C. Then centroid
of the triangle is
  • (3a,3b,3c)
  • (3a3b,3c)
  • (a3,b3,c3)
  • (1a,1b,1c)
The name of the figure formed by the points (1,3,4),(5,1,1),(7,4,7) and (1,6,10) is a
  • square
  • rhombus
  • parallelogram
  • rectangle
The end points of a body diagonal of a rectangular parallelepiped whose faces are parallel to the coordinate planes are (2,3,5) and (5,7,10). The lengths of its sides are 
  • 5,7,3
  • 6,5,3
  • 3,6,2
  • 3,4,5
A tetrahedron is a three dimensional figure bounded by non coplanar triangular planes. So, a tetrahedron has four non-coplanar points as its vertices. Suppose a tetrehedron has points A,B,C,D as its vertices which have coordinates (x1,y1,z1)(x2,y2,z2) , (x3,y3,z3) and (x4,y4,z4), respectively in a rectangular three dimensional space. Then, the coordinates of its centroid are [x1+x2+x3+x44,y1+y2+y3+y44,z1+z2+z3+z44].
Let a tetrahedron have three of its vertices represented by the points (0,0,0),(6,5,1) and (4,1,3) and its centroid lies at the point (1,2,5). Now, answer the following question. The coordinate of the fourth vertex of the tetrahedron is:
  • (6,2,16)
  • (1,2,13)
  • (2,4,2)
  • (1,1,1)
The equation of median through C to side AB is
  • r=ˆi+ˆj+ˆk+p(3ˆi2ˆk)

  • r=ˆi+ˆj+ˆk+p(3ˆi+2ˆk)

  • r=ˆi+ˆj+ˆk+p(3ˆi+2ˆk)

  • r=ˆi+ˆj+ˆk+p(3ˆi+2ˆj)

If the extremities of a diagonal of a square are (1,2,3) and (4,2,3) then the area of the square is
  • 25
  • 50
  • 252
  • 50
P(1,1,1) and Q(λ,λ,λ) are two points in the space such that PQ=48, then value(s) of λ can be
  • 3
  • 5
  • 4
  • 2
L1:x12=y23=z34
L2:x23=y42=z55 be two given lines, point P lies on L1 and Q lies on L2 then distance between P and Q can be
  • 13
  • 19
  • 15
  • 30
From which of the following the distance of the point (1,2,3) is 10?
  • Origin
  • xaxis
  • yaxis
  • zaxis
The plane ax+by+cz+d=0 divides the line joining (x1,y1,z1) and (x2,y2,z2) in the ratio
  • ax1+by1+cz1+dax2+by2+cz2+d
  • ax1×ax2+by1×by2+cz1×cz2+d2ax2+by2+cz2+d
  • a+b+c+dx1+x2+y1+y2+z1+z2
  • ax21+by21+cz21+dax22+by22+cz22+d
If the centroid of triangle whose vertices are (a,1,3),(2,b,5) and (4,7,c) be the origin, then the values of a,b and c are
  • 2,8,2
  • 2,8,2
  • 2,8,2
  • 7,1,0
Find the ratio in which 2x+3y+5z=1 divides the line joining the points (1, 0, 3) and (1, 5, 7).
  • 1:2
  • 2:1
  • 3:2
  • 2:3
If the sum of the squares of the distance of a point from the three coordinate axes be 36, then its distance from the origin is
  • 6 units
  • 3 2 units
  • 2 3 units
  • none of these
The circum radius of the triangle formed by the points (0,0,0), (0,0,12) and (3,4,0) is
  • 156
  • 13
  • 132
  • 8
The coordinates of the point where the line segment joining A(5,1,6) and B(3,4,1) crosses the yz plane are
  • (0,172,132)
  • (0,172,132)
  • (0,172,132)
  • (0,172,132)
If the plane 7x+11y+13z=3003 meets the axes in A,B,C, then the centroid of ΔABC is
  • (143,91,77)
  • (143,77,91)
  • (91,143,77)
  • (143,66,91)
Four vertices of a tetrahedron are (0,0,0),(4,0,0),(0,8,0) and (0,0,12). Its centroid has the coordinates
  • (43,83,4)
  • (2,4,6)
  • (1,2,3)
  • none of these
0:0:2


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