All India Engineering / Architecture Entrance Examination (AIEEE)
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AIEEE 2007 Mathematics
Q. 9. Let L be the line of intersection of the planes 2x + 3y +z = 1 and x + 3y +2z = 2. If L makes an angle 
with the positive x-axis, then 
equals
- 1
Sol:
Correct choice: (1)
Q. 10. The differential equation of all circles passing through the origin and having their centres on the x-axis is
Sol: Equation of family of circles passing through origin and having their centres on x-axis is
Correct choice: (3)
Q. 11. If p and q are positive real numbers such that then
the maximum value of (p + q) is
- 2
Sol: 
Correct choice: (4)