If (1,2) is a limiting point of a coaxial system of circles containing the circle x2+y2+x-5y+9=0,then the equation of radical axis is

1.  3x-y-1=0

2.  x+9y-4=0

3.  3x-y+4=0

4.  x+3y+9=0

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4
Correct Answer :

3x-y+4=0


Explanation :
No Explanation available for this question

If the lengths of the tangent from P(h,k) to the circles x2+y2-4x-5=0 and x2+y2+6x-2y+6=0 are equal then

1.  10h+2k+11=0

2.  10h-2k+11=0

3.  2h-10k+11=0

4.  2h+10k+11=0

View Answer  
4
Correct Answer :

10h-2k+11=0


Explanation :
No Explanation available for this question

A:If origin is a limiting point of a coaxal system of which x2+y2-6x-8y+1=0 is member then the other limiting point is (3/25,4/25)

1.  A is false but R is true

2.  A is true but R is false

3.  Both A and R are true but R is not the correct explanation of A

4.  Both A and R are true and R is the correct explanation of A

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4
Correct Answer :

Both A and R are true and R is the correct explanation of A


Explanation :
No Explanation available for this question

I:Let x2+y2+2g1x+c=0,i=1,2,3 be three coaxal circles whose radii r1,r2 and r3 are respectively and t1,t2,t3 be the lengths of the

1.  Neither I nor II is true

2.  Both I&II are true

3.  Only II is true

4.  Only I is true

View Answer  
4
Correct Answer :

Both I&II are true


Explanation :
No Explanation available for this question

A:The radical centre of the circles x2+y2=4,x2+y2-3x=4,x2+y2-4y=4 is (0,0) R:Rad

1.  A is false but R is true

2.  A is true but R is false

3.  Both A and R are true but R is not the correct explanation of A

4.  Both A and R are true and R is the correct explanation of A

View Answer  
4
Correct Answer :

Both A and R are true and R is the correct explanation of A


Explanation :
No Explanation available for this question

The radical centre of the circles x2+y2=9,x2+y2-2x-2y-5=0 and x2+y2+4x+6y-19=0

1.  (-1,-1)

2.  (1,1)

3.  (1,2)

4.  (1,-1)

View Answer  
4
Correct Answer :

(1,1)


Explanation :
No Explanation available for this question

If Q is the radical centre of the three circles x2+y2=a2, (x-g)2+y2=a2and x2+(y-f)2=a2,then Qx+Qy=

1.  –(g+f)/2

2.  2g+2f

3.  (g+f)/2

4.  g+f

View Answer  
4
Correct Answer :

(g+f)/2


Explanation :
No Explanation available for this question

There are two circles whose equations are x2+y2=9 and x2+y2-8x-6y+n2=0,n∈Z.If the two circles have exactly two common tangents then the number of possible values of n is

1.  5

2.  9

3.  8

4.  2

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4
Correct Answer :

9


Explanation :
No Explanation available for this question

(2,3) and (-3,2) are two limiting points of coaxal system.If the equation of the circle belonging to the coaxal system and passing through the point (-1,3) is x2+y2+2gx+2fy+c=0 then c=

1.  -26

2.  13

3.  -13

4.  26

View Answer  
4
Correct Answer :

13


Explanation :
No Explanation available for this question

The limiting points of the coaxal system x2+y2+2fy+9=0(f is a variable) are

1.  

2.  

3.  

4.  

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question
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