1
IIT-JEE 2011 Paper 2 Offline
+4
-1
A value of $$b$$ for which the equations $$\matrix{ {{x^2} + bx - 1 = 0} \cr {{x^2} + x + b = 0} \cr }$$\$

have one root in common is

A
$$- \sqrt 2$$
B
$$- i\sqrt 3$$
C
$$i\sqrt 5$$
D
$$\sqrt 2$$
2
IIT-JEE 2010 Paper 1 Offline
+3
-0.75
Let $$p$$ and $$q$$ be real numbers such that $$p \ne 0,\,{p^3} \ne q$$ and $${p^3} \ne - q.$$ If $${p^3} \ne - q.$$ and $$\,\beta$$ are nonzero complex numbers satisfying $$\alpha \, + \beta = - p\,$$ and $${\alpha ^3} + {\beta ^3} = q,$$ then a quadratic equation having $${\alpha \over \beta }$$ and $${\beta \over \alpha }$$ as its roots is
A
$$\left( {{p^3} + q} \right){x^2} - \left( {{p^3} + 2q} \right)x + \left( {{p^3} + q} \right) = 0$$
B
$$\left( {{p^3} + q} \right){x^2} - \left( {{p^3} - 2q} \right)x + \left( {{p^3} + q} \right) = 0$$
C
$$\left( {{p^3} - q} \right){x^2} - \left( {5{p^3} - 2q} \right)x + \left( {{p^3} - q} \right) = 0$$
D
$$\left( {{p^3} - q} \right){x^2} - \left( {5{p^3} + 2q} \right)x + \left( {{p^3} - q} \right) = 0$$
3
IIT-JEE 2008 Paper 2 Offline
+3
-1
Let $$a,\,b,c$$, $$p,q$$ be real numbers. Suppose $$\alpha ,\,\beta$$ are the roots of the equation $${x^2} + 2px + q = 0$$ and $$\alpha ,{1 \over \beta }$$ are the roots of the equation $$a{x^2} + 2bx + c = 0,$$ where $${\beta ^2} \in \left\{ { - 1,\,0,\,1} \right\}$$

STATEMENT - 1 : $$\left( {{p^2} - q} \right)\left( {{b^2} - ac} \right) \ge 0$$

and STATEMENT - 2 : $$b \ne pa$$ or $$c \ne qa$$

A
STATEMENT - 1 is True, STATEMENT - 2 is True;
STATEMENT - 2 is a correct explanation for
STATEMENT - 1
B
STATEMENT - 1 is True, STATEMENT - 2 is True;
STATEMENT - 2 is NOT a correct explanation for
STATEMENT - 1
C
STATEMENT - 1 is True, STATEMENT - 2 is False
D
STATEMENT - 1 is False, STATEMENT - 2 is True
4
IIT-JEE 2007
+3
-0.75
Let $$\alpha ,\,\beta$$ be the roots of the equation $${x^2} - px + r = 0$$ and $${\alpha \over 2},\,2\beta$$ be the roots of the equation $${x^2} - qx + r = 0$$. Then the value of $$r$$
A
$${2 \over 9}\left( {p - q} \right)\left( {2q - p} \right)$$
B
$${2 \over 9}\left( {q - p} \right)\left( {2p - q} \right)$$
C
$${2 \over 9}\left( {q - 2p} \right)\left( {2q - p} \right)$$
D
$${2 \over 9}\left( {2p - q} \right)\left( {2q - p} \right)$$
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