Eamcet - Maths - 3d Coordinate System Question And Answers

The fourth vertex of the parallelogram whose consecutive vertices are (2,4,-1), (3,6,-1),(4,5,1) is

A.  (3,3,1)

B.  (4,-2,-4)

C.  (2,2/3,2)

D.  (5,0,1)

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If the points (3,2,-4) ,(5,4,k), (9,8,-10) are collinear then k=

A.  6

B.  3

C.  6

D.  -3

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The locus of a point P such that PA+PB=4 where A=(2,3,4) ,B=(-2,3,4) is

A.  y2+z2+6y+8z+25=0

B.  y2-z2+6y+8z-25=0

C.  y2+z2-6y-8z+25=0

D.  y2+z2-6y-8z-25=0

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If the orthocenter and the circumcentre of a triangle are (-3,5,2), (6,2,5) then its centroid is

A.  (3,3,4)

B.  (3/2,7/2,7/2)

C.  (-9/2,7/2,-3/2)

D.  (9/2, -3/2,3/2)

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The ends of the hypotenuse of a right angled triangle are (2,0,-3), (0,4,1) then the locus of the third vertex is

A.  x2+y2+z2-2x-4y+2z-3=0

B.  x2+y2+z2+2x+4y+2z+3=0

C.  x2-y2-z2-2x-4y+2z-3=0

D.  x2+y2-z2+2x+4y+2z-3=0

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The line joining the points (2,3,4) and (4,10,7) intersects the line joining(2,-1,5) and (4, -30,17). Then the coordinates of the point of intersection are

A.  (6/4, -8/9,33/9)

B.  (16/9, 20/9, 33/9)

C.  (16/4,38/9, 13/9)

D.  (0,2,3)

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The circumradius of the triangle formed by the points (2,-1,1) , (1,-3,-5), (3,-4,-4) is

A.  1/2√6

B.  1/2√35

C.  1/2√41

D.  √41

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The orthocentre of the triangle formed by the points(2,-1,1), (1,-3,-5), (3,-4,-4) is

A.  (2,-1,1)

B.  (1,-3,-5)

C.  (3,-4,-4)

D.  (2,-8/3,-8/3)

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The points of trisection of the line segment joining (2,-3,5), (3,1,-2) are

A.  (8/3, -1/3, 1/3), (7/3, -5/3,8/3)

B.   (7/3,4,13/3) ,(8/3,3,14/3)

C.  (-8/3, -1/3,1/3), (7/3,-5/3,8/3)

D.  (-7/3,4, 13/3), (8/3,3,14/3)

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If the origin is the centroid of the tetrahedron for which (2,-1,3), (-1,3,1), (3,4,-2) are three vertices then the fourth vertex is

A.  (4,6,2)

B.  (-4,-6,-2)

C.  (-4,6,-2)

D.  (4,-6,2)

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The locus of a point which is at a distance of 5 unit from (2,1,-3) is

A.  x2+y2+z2+2x+4z+5=0

B.  x2+y2+z2+2x-4z-20=0

C.  x2+y2+z2-2x-4z+5=0

D.  x2+y2+z2-4x-2y+6z-11=0

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The distance between the circumcentre and the orthocenter of the triangle formed by the points (2,1,5), (3,2,3), (4,0,4) is

A.  √6

B.  1/2√6

C.  3

D.  0

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The fourth vertex of the square whose consecutive vertices are (4,5,1), (2,4,-1), (3,6,-3) is

A.  (-4,2,4)

B.  (4,-2,-4)

C.  (5,7,-1)

D.  (5,0,1)

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The locus of a point which is equidistant from the points(-2,2,3), (3,4,5) is

A.  10x+4y+4z-33=0

B.  10x-5y+2z=0

C.  10x-5y-2z=0

D.  10x+5y-2z=0

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The orthocentre of the triangle formed by the points(2,1,5), (3,2,3), (4,0,4) is

A.  (2,1,5

B.  (3,2,3)

C.  (4,0,4)

D.  (3,1,4)

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If (2,1,1) is the centroid of the triangle for which (3,2,-1), (2,-2,5) are two vertices then the third vertex is

A.  (1,2,9)

B.  (10,4,-9)

C.  (1,-5,-2)

D.  (1,3,-1)

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If the orthocenter and the circumcentre of a triangle are (-3,5,1), (3,3,-1) then the circumcentre is

A.  (6,2,-2)

B.  (0,2,0)

C.  (6,-2,-2)

D.  (-6,2,2)

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If (2,3,4) is the centroid of the  tetrahedron for which (2,3,-1), (3,0,-2), (-1,4,3) are three vertices then the fourth vertex is

A.  (4,5,16)

B.  (3,2,4)

C.  (2,3,4)

D.  (2,2,12)

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The centroid of the triangle formed by the points (2,3,-1), (5,6,3),(2,-3,1) is

A.  (2,-1,3)

B.  (-2,1,3)

C.  (2,1,-3)

D.  (3,2,1)

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The locus of a point P such that the distances from P to the points (2,3,5) ,( 1,2,-1)  are in the ratio 5:2 is

A.  21x2+21y2+21z2-34x-76y+90z-2=0

B.  21x2-21y2+21z2-34x-76y+90z-2=0

C.  21x2+21y2+21z2-34x+76y+90z+2=0

D.  21x2-21y2-21z2-34x-76y+90z-2=0

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The locus of the point if the join of the points (-4,2,3), (2,-1,5) subtends a right angle at P is

A.  x2+y2-z2+2x-y-8z+5=0

B.  x2+y2-z2+2x-y-8z-5=0

C.  x2+y2+z2+2x-y-8z+5=0

D.  x2-y2-z2+2x-y-8z-5=0

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The centroid of the tetrahedron formed by the points(3,2,5), (-3,8,-5), (-3,2,1),(-1,4,-3) is

A.  (0,-1,5/2)

B.  (5/4,3/4,7/4)

C.  (-1,4,-1/2)

D.  (5,-1,0)

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In ABC where A(4,5,6), B(3,2,1), C(5,4,3), if p,q,r are lengths of the medians through A,B,C then ascending order of p,q,r is

A.  p,q,r

B.  q,p,r

C.  r,p,q

D.  r,q,p

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A plane passes through (2, 3, -1) and is perpendicular to the line having direction ratios ( 3, -4, 7). The perpendicular distance from the origin to this plane is

A.  13/√74

B.  3/√74

C.  5/√74

D.  6/√74

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The ratio in which (5,4,-6) divides the line segment joining (3,2,-4),(9,8,-10) is

A.  2:1

B.  1:2

C.  2:3

D.  3:2

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The circumcentre of the triangle formed by the points(1,2,3), (3,-1,5), (4,0,-3) is

A.  (2,1/2,4)

B.  (7/2,-1/2,1)

C.  (5/2,1,0)

D.  (8/3,1/3,5/3)

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The coplanar points(3,2,1), (5,6,5),(2,1,2),(0,-3,-2) form a

A.  square

B.  rectangle

C.  rhombus

D.  parallelogram

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If the centroid of the triangle formed by (a,1,3), (-2,b,-5) and (4,7,c) is the origin then(a,b,c)=

A.  (2,8,2)

B.  (2,8,-2)

C.  (-2,-8,2)

D.  (2,-8,2)

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The ratio in which yz-plane divides the line segment joining (3,4,5) ,(2,-3,1) is

A.  1:2

B.  2:1

C.  1:3

D.  3:-2

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The point dividing the join of (3, -2, 1} and (-2, 3, 11) in the ratio 2 : 3 is :

A.  (1, 1, 4)

B.  (1, 0, 5)

C.  (2, 3, 5)

D.  (0, 6, -1)

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