1
NDA Mathematics 18 April 2021
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
If the lines y + px = 1 and y - qx = 2 are perpendicular, then which one of the following is correct?
A
pq + 1 = 0
B
p + q + 1 = 0
C
pq - 1 = 0
D
p - q + 1 = 0
2
NDA Mathematics 18 April 2021
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
If A, B and C are in AP, then the straight line Ax + 2By + C = 0 will always pass through a fixed point. The fixed point is
A
(0, 0)
B
(-1, 1)
C
(1, -2)
D
(1, -1)
3
NDA Mathematics 18 April 2021
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
If the image of the point (-4, 2) by a line mirror is (4, -2), then what is the equation of the line mirror?
A
y = x
B
y = 2x
C
4y = x
D
y = 4x
4
NDA Mathematics 18 April 2021
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language

Consider the following statements in respect of the points (p, p - 3), (q + 3, q) and (6, 3):

1. The points lie on a straight line.

2. The points always lie in the first quadrant only for any value of p and q.

Which of the above statements is/are correct?

A
1 only
B
2 only
C
Both 1 and 2
D
Neither 1 nor 2
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