1
NDA 2017 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
It is given that the roots of the equation $${x^2} - 4x - {\log _3}P = 0$$ are real. For this the minimum value of P is
A
$${1 \over {27}}$$
B
$${1 \over {64}}$$
C
$${1 \over {81}}$$
D
1
2
NDA 2017 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
If $$\alpha$$ and $$\beta$$ are the roots of the equation 3x2 + 2x + 1 = 0, then the equation whose roots are $$\alpha$$ + $$\beta$$$$-$$1 and $$\beta$$ + $$\alpha$$$$-$$1 is
A
3x2 + 8x + 16 = 0
B
3x2 $$-$$ 8x $$-$$ 16 = 0
C
3x2 + 8x $$-$$ 16 = 0
D
x2 + 8x + 16 = 0
3
NDA 2017 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
In $$\Delta$$PQR, $$\angle$$R = $${\pi \over 2}$$. If $$\tan \left( {{P \over 2}} \right)$$ and $$\tan \left( {{Q \over 2}} \right)$$ are the roots of the equation ax2 + bx + c = 0, then which one of the following is correct?
A
a = b + c
B
b = c + a
C
c = a + b
D
b = c
4
NDA 2017 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
If the difference between the roots of the equation $${x^2} + kx + 1 = 0$$ is strictly less than $$\sqrt 5 $$, where $$\left| k \right| \ge 2$$, then k can be any element of the interval
A
($$-$$3, $$-$$2] $$\cup$$ [2, 3)
B
($$-$$3, 3)
C
[$$-$$3, $$-$$2] $$\cup$$ [2, 3]
D
None of the above
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