1
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
The number of real roots of the equation $${x^2} - 3\left| x \right| + 2 = 0$$ is
A
4
B
3
C
2
D
1
2
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
If the sum of the roots of the equation $$a{x^2} + bx + c = 0$$ is equal to the sum of their squares, then
A
a2 + b2 = c2
B
a2 + b2 = a + b
C
ab + b2 = 2ac
D
ab $$-$$ b2 = 2ac
3
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
If the roots of the equation x2 $$-$$ nx + m = 0 differ by 1, then
A
n2 $$-$$ 4m $$-$$ 1 = 0
B
n2 + 4m $$-$$ 1 = 0
C
m2 + 4n + 1 = 0
D
m2 $$-$$ 4n $$-$$ 1 = 0
4
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
If a, b and c are the sides of a $$\Delta$$ABC, then $${a^{{1 \over p}}} + {b^{{1 \over p}}} - {c^{{1 \over p}}}$$, where p > 1, is
A
always negative
B
always positive
C
always zero
D
positive, if 1 < p < 2 and negative if p > 2
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