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The value of a for which the lines repre...

The value of a for which the lines represented by `ax^(2)+5xy +2y^(2) = 0` are mutually perpendicular is

A

2

B

`-2`

C

`25//8`

D

none of these.

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The correct Answer is:
B
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KCET PREVIOUS YEAR PAPERS-MODEL TEST PAPER - 8-MATHEMATICS
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  2. If the angle between the two lines represented by 2x^(2)+5xy + 3y^(2) ...

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  3. The value of a for which the lines represented by ax^(2)+5xy +2y^(2) =...

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  4. The equation of the straight line which passes through the point (1, -...

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  5. The joint equation of the straight lines x + y = 1 and x - y = 4 is

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  6. The equation of the circle having radius 3 and touching the circle x^(...

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  7. The locus of the midpoint of a chord of the circle x^(2)+y^(2) = 4 whi...

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  8. The circles x^(2) + y^(2) + x + y = 0 and x^(2) + y^(2)+ x - y = 0 int...

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  9. If the radical axis of the circles x^(2)+y^(2)+2gx + 2fy + c = 0 and...

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  10. The slope of the tangent at the point (h, h) of the circle x^(2) + y^(...

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  11. If the vertex of a parabola is the point (-3, 0) and the directrix is ...

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  12. The vertex of a parabola is the point (a, b) and latus-rectum is of le...

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  13. The equation to the ellipse (referred to its axes as the axes of x and...

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  14. The locus of the middle point of the portion of a tangent to the ellip...

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  15. The equations to the common tangents to the two hyperbolas (x^(2))/(a^...

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  16. The vectors 2overset(hat)i + 3 overset(hat)j-4overset(hat)kand aoverse...

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  17. If veca .vecb = veca.vec cand veca xx vecb = veca xx vec c,veca ne0, t...

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  18. If vecp = veca - vecb , vecq = vec a + vec b and |veca| = |vecb| = 2 ...

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  19. Let a = hat I + hatj +hatk, vec b = hati-hatj+hatk and c be a unit vec...

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  20. The value of underset(x rarr0)limsqrt((1)/(2)(1-cos2x))/(x) is

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