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CBSE Questions for Class 12 Commerce Maths Three Dimensional Geometry Quiz 4 - MCQExams.com

The point collinear with (4,2,0) and (6,4,6) among the following is
  • (0,4,6)
  • (8,6,8)
  • (1,4,6)
  • None of these
Equation of the line which passes through the point with position vector (2,1,0) and perpendicular to the plane containing the vectors i+j and j+k is
  • r=(2,1,0)+t(1,1,1)
  • r=(2,1,0)+t(1,1,1)
  • r=(2,1,0)+t(1,1,1)
  • r=(2,1,0)+t(1,1,1)
If O is the origin and A is the point (a,b,c), then the equation of the plane through A and at right angles to OA is
  • a(xa)b(yb)c(zc)=0
  • a(x+a)+b(y+b)+c(z+c)=0
  • a(xa)+b(yb)+c(zc)=0
  • None of the above
The values of a for which point (8,7,a),(5,2,4) and (6,1,2) are collinear.
  • 4
  • 2
  • 0
  • 2
The equation of the perpendicular from the point (α,β,γ) to the plane ax+by+cz+d=0 is
  • a(xα)+b(yβ)+c(zγ)=0
  • xαa=yβb=zyc
  • a(xα)+b(yβ)+c(zγ)=abc
  • None of these
The straight line x33=y21=z10 is
  • parallel to x-axis
  • parallel to y-axis
  • parallel to z-axis
  • perpendicular to z-axis
The equation of altitude through B to side AC is
  • r=k+t(7i10+2k)
  • r=k+t(9i+6j2k)
  • r=k+t(7i10j2k)
  • r=k+t(7i+10j+2k)
The equation of the plane through (1,2,3) and parallel to the plane 2x+3y4z=0 is
  • 2x+3y+4z=4
  • 2x+3y+4z+4=0
  • 2x3y+4z+4=0
  • 2x+3y4z+4=0
If M denotes the mid-point of the line segment joining A(4ˆi+5ˆj10ˆk) and B(ˆi+2ˆj+ˆk), then the equation of the plane through M and perpendicular to AB, is
  • r.(5ˆi3ˆj+11ˆk)+1352=0
  • r.(32ˆi+72ˆj92ˆk)+1352=0
  • r.(4ˆi+5ˆj10ˆk)+4=0
  • r.(ˆi+2ˆj+ˆk)+4=0
If the points a(1,2,1),B(2,6,2) and c(λ,2,4) are collinear then λ is
  • 0
  • 2
  • 2
  • 1
Given A(1,1,0); B(3,1,2); C(2,2,4) and D(1,1,1) which of the following points neither lie on AB nor on CD?
  • (2,2,4)
  • (2,2,4)
  • (2,0,1)
  • (0,2,1)
The projections of a directed line segment on the coordinate axes 12,4,3. The direction cosines of the line are
  • 1213,413,313
  • 1213,413,313
  • 1213,413,313
  • none of these
Given A(1,1,0); B(3,1,2);C(2,2,4) and D(1,1,1) which of the following points neither lie on AB nor on CD
  • (2,2,4)
  • (2,2,4)
  • (2,0,1)
  • (0,2,1)
The vector equation of the line x22=2y53,z=1 is r=(2ˆi+52ˆjˆk)+λ(2ˆi32ˆj+xˆk), where x is equal to
  • 0
  • 1
  • 2
  • 3
The equation of the right bisector plane of the segment joining (2,3,4) and (6,7,8) is
  • x+y+z+15=0
  • x+y+z15=0
  • xy+z15=0
  • None of these
Equation of plane passing through the points (2,2,1), (9,3,6) and perpendicular to the plane 2x+6y+6z1=0 is
  • 3x+4y+5z=9
  • 3x+4y5z+9=0
  • 3x+4y5z9=0
  • None of these
Vector equation of the plane r=ˆiˆj+λ(ˆi+ˆj+ˆk)+μ(ˆi2ˆj+3ˆk) in the scalar dot product form is
  • r.(5ˆi+2ˆj3ˆk)=7
  • r.(5ˆi2ˆj+3ˆk)=7
  • r.(5ˆi2ˆj3ˆk)=7
  • r.(5ˆi+2ˆj+3ˆk)=17
If the points (0,1,2),(3, λ,1) and (μ, 7,4) are collinear, the point on the same line is
  • (5,6,3)
  • (1,1,2)
  • (5,6,3)
  • (0,0,0)
The equation of the plane passing through the line x12=y+11=z3 and parallel to the direction whose direction numbers are 3,4,2 is
  • 14x5y11z=19
  • 3x+4y+2z+1=0
  • 2xy+3z=3
  • none of these
A line makes angles α, β, γ with the positive directions of the axes of reference. The value of cos2α+cos2β+cos2γ is
  • 1
  • 2
  • 1
  • 0
If the points A(1,2,1), B(2,6,2) and C(λ,2,4) are collinear, then λ is
  • 0
  • 2
  • 2
  • 1
The direction cosines of the line joining the points (2,3,1) and (3,2,1) are
  • 1,5,2
  • 130,56,215
  • 130,16,115
  • none of these
The direction cosines of the perpendicular from the origin to the plane 3xy+4z=5 are
  • 4,1,3
  • 3,1,4
  • 326,126,426
  • 426,126,326
The angle between the lines x+22=y+32=z41 and x10=y3=z0 is
  • cos1(23)
  • cos1(13)
  • cos1(12)
  • cos1(1)
The direction cosines of the normal to the plane 5(x2)=3(yz) are
  • 5,3,3
  • 543,343,343
  • 12,310,310
  • 1,35,35
If the direction cosines of the line joining the origin and a point at unit distance from the origin are 13, 12, λ    then value of λ is?
  • 1253
  • 23
  • 1253
  • none of these
If θ is an angle given by cosθ  = cos2α+cos2β+cos2γsin2α+sin2β+sin2γ where  α, β, γ are the angles made by a line with the positive directions of the axes of reference then the measure of θ is
  • π4
  • π6
  • π2
  • π3
If a line makes angles of 60 and 45 with the positive directions of the x-axis and y-axis respectively, then the acute angle between the line and the z-axis is
  • 60
  • 45
  • 75
  • 15
ABC is a triangle where A=(2,3,5),B=(1,3,2) and C=(λ,5,μ). If the median through A is equally inclined with the axes, then
  • λ=14,μ=20
  • λ=9,μ=6
  • λ=72,μ=20
  • λ=10,μ=7
If the image of the point (1,1,1) by a plane (3,1,5) then the equation of the plane is
  • xy+2z=8
  • xy+2z=16
  • xy+2z=14
  • None of these
Which of the triplet can not represent direction cosine of a line
  • (13,13,13)
  • (350,450,550)
  • (477,577,677)
  • (225,325,425)
The direction ratios of a normal to the plane through (1,0,0),(0,1,0), which makes an angle of π4 with the plane x+y=3 are 
  • 1,2,1
  • 1,1,2
  • 1,1,2
  • 2,1,1
let P(4,1,λ) and Q(2,1,λ) be two points. A line having direction ratios 1,1,6 is perpendicular to the plane passing through the origin, P and Q, then λ equals
  • 12
  • 12
  • 1
  • none of these
The position vectors of three points are 2ab+3c, a2b+λc and μa5b where a,b,c are non coplanar vectors, then the points are collinear when
  • λ=2,μ=94
  • λ=94,μ=2
  • λ=94,μ=2
  • None of these
The angle between two lines whose direction cosines satisfy the equations n=l+m and m=2l+3n is
  • 180
  • 90
  • 60
  • none of these
Let the direction - cosines of the line which is equally inclined to the axis be ±1k. Find k ?
  • 2
  • 3
  • 5
  • 6
If the direction ratios of a line are 1+λ,1λ,2, and it makes an angle of 60o with the y-axis then λ is
  • 1+3
  • 2+5
  • 13
  • 25
Let A=(1,2,2), B=(2,3,6)and C=(3,4,12). The direction cosines of a line equally inclined with OA,OB and OC , where O is the origin, are
  • 12,12,0
  • 12,12,0
  • 13,13,13
  • 13,13,13
A st. line which makes angle of 60 with each of y - and z - axes, is inclined with x - axis at an angle
  • 45
  • 30
  • 75
  • 60
The acute angle between two lines whose direction ratios are 2,3,6 and 1,2,2 is
  • cos1(2021)
  • cos1(1821)
  • cos1(821)
  • None of these
Find the equations of the plane through the point (x1,y1,z1) and perpendicular to the straight line xαl=yβm=zγn
  • l(xx1)+m(yy1)+n(zz1)=0.
  • l(xx1)+m(yy1)n(zz1)=0.
  • l(xx1)m(yy1)+n(zz1)=0.
  • none of these
Which of the following triplets give the direction cosines of a line ?
  • 1,1,1
  • 1,1,1
  • 1,1,1
  • 13,13,13
If a point P in the space such that ¯OP is inclined to OX at 45 and OZ to 60 then ¯OP inclined to OY is
  • 75
  • 75or105
  • 60or120
  • None of these
The equation of the plane which bisect the join of point (7,2,3) and (1,4,3) perpendicularly is
  • x+2y+3=0
  • 2xy+3=0
  • x+y+2z+7=0
  • 4x+3y=9
If a line makes angles α,β,γ with axes of co-ordinates, then cos2α+cos2β+cos2γ is equla to
  • 2
  • 1
  • 1
  • 2
If a line makes an angle θ1,θ2,θ3 which the axis respectively, then cos2θ1+cos2θ2+cos2θ3=?
  • 4
  • 2
  • 3
  • 1
ˉa,ˉb,ˉc are three non-zero vectors such that any two of them are non-collinear. If  ˉa+ˉb is collinear with  ˉc and  ˉb+ˉc is collinear with ˉa, then what is their sum?
  • 1
  • 0
  • 1
  • 2
The equation of plane through (1,2,3) and parallel to the plane ˉr.(^3i+^4j+^5k)=0
  • ˉr.(^3i+^4j+^5k)=26
  • ˉr.(^3i^4j+^5k)+4
  • ˉr.(^3i+^4j^5k)+4=0
  • None of these
  • Both Assertion & Reason are individually true & Reason is correct explanation of Assertion
  • Both Assertion & Reason are individually true but Reason is not the ,correct (proper) explanation of Assertion
  • Assertion is true but Reason is false
  • Assertion is false but Reason is true
Equation of the plane which passes through the point (-1, 3, 2) & is  to each of the planes p1 & p2 is
  • 2x+y+z+1=0
  • 3x+8y2z17=0
  • 2x+yz+1=0
  • x2y+z+1=0
0:0:1


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