1
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
The lines 2x = 3y = $$-$$ z and 6x = $$-$$ y = $$-$$ 4z
A
are perpendicular
B
are parallel
C
intersect at an angle 45$$^\circ$$
D
intersect at an angle 60$$^\circ$$
2
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
The radius of the sphere $$3{x^2} + 3{y^2} + 3{z^2} - 8x + 4y + 8z - 15 = 0$$ is
A
2
B
3
C
4
D
5
3
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
The direction ratios of the line perpendicular to the lines with direction ratios < 1, $$-$$2, $$-$$2 > and < 0, 2, 1 > are
A
< 2, $$-$$1, 2 >
B
< $$-$$2, 1, 2 >
C
< 2, 1, $$-$$2 >
D
< $$-$$2, $$-$$1, $$-$$2 >
4
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
What are the coordinates of the foot of the perpendicular drawn from the point (3, 5, 4) on the plane z = 0 ?
A
(0, 5, 4)
B
(3, 5, 0)
C
(3, 0, 4)
D
(0, 0, 4)
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