1
NDA 2018 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
What is the distance between the straight lines 3x + 4y = 9 and 6x + 8y = 15 ?
A
$${3 \over 2}$$
B
$${3 \over 10}$$
C
6
D
5
2
NDA 2019 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
What is the distance between the points $$P(m\cos 2\alpha ,m\sin 2\alpha )$$ and $$Q(m\cos 2\beta ,m\sin 2\beta )$$ ?
A
$$\left| {2m\sin (\alpha - \beta )} \right|$$
B
$$\left| {2m\cos (\alpha - \beta )} \right|$$
C
$$\left| {m\sin (2\alpha - 2\beta )} \right|$$
D
$$\left| {m\cos (2\alpha - 2\beta )} \right|$$
3
NDA 2019 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
An equilateral triangle has one vertex at ($$-$$1, $$-$$1) and another vertex at $$( - \sqrt 3 ,\sqrt 3 )$$. The third vertex may lie on
A
$$( - \sqrt 2 ,\sqrt 2 )$$
B
$$(\sqrt 2 , - \sqrt 2 )$$
C
(1, 1)
D
(1, $$-$$1)
4
NDA 2019 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
The equation ax + by + c = 0 represents a straight line
A
for all real numbers, a, b and c
B
only when a $$\ne$$ 0
C
only when b $$\ne$$ 0
D
only when at least one of a and b is non-zero
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