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1
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
The area of the figure formed by the lines

ax + by + c = 0, ax $$-$$ by + c = 0, ax + by $$-$$ c = 0 and ax $$-$$ by $$-$$ c = 0 is
A
$${{{c^2}} \over {ab}}$$
B
$${{{2c^2}} \over {ab}}$$
C
$${{{c^2}} \over {2ab}}$$
D
$${{{c^2}} \over {4ab}}$$
2
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
If a line is perpendicular to the line 5x $$-$$ y = 0 and forms a triangle of area 5 sq units with coordinate axes, then its equation is
A
x + 5y $$\mp$$ 5$$\sqrt 2 $$ = 0
B
x $$-$$ 5y $$\mp$$ 5$$\sqrt 2 $$ = 0
C
5x + y $$\mp$$ 5$$\sqrt 2 $$ = 0
D
5x $$-$$ y $$\mp$$ 5$$\sqrt 2 $$ = 0
3
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
The three lines 4x + 4y = 1, 8x $$-$$ 3y = 2, y = 0 are
A
the sides of an isosceles triangle
B
concurrent
C
mutually perpendicular
D
the sides of an equilateral triangle
4
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
The line 3x + 4y $$-$$ 24 = 0 intersects the X-axis at A and Y-axis at B. Then, the circumcentre of the $$\Delta$$OAB, where O is the origin, is
A
(2, 3)
B
(3, 3)
C
(4, 3)
D
None of these
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