1
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
If the equation $${a_n}{x^n} + {a_{n - 1}}{x^{n - 1}} + ........... + {a_1}x = 0$$
$${a_1} \ne 0,n \ge 2,$$ has a positive root $$x = \alpha $$, then the equation
$$n{a_n}{x^{n - 1}} + \left( {n - 1} \right){a_{n - 1}}{x^{n - 2}} + ........... + {a_1} = 0$$ has a positive root, which is
A
greater than $$\alpha $$
B
smaller than $$\alpha $$
C
greater than or equal to smaller than $$\alpha $$
D
equal to smaller than $$\alpha $$
2
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
If $${A^2} - A + 1 = 0$$, then the inverse of $$A$$ is :
A
$$A+I$$
B
$$A$$
C
$$A-I$$
D
$$I-A$$
3
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
The system of equations

$$\matrix{ {\alpha \,x + y + z = \alpha - 1} \cr {x + \alpha y + z = \alpha - 1} \cr {x + y + \alpha \,z = \alpha - 1} \cr } $$

has infinite solutions, if $$\alpha $$ is :

A
$$-2$$
B
either $$-2$$ or $$1$$
C
not $$-2$$
D
$$1$$
4
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
If $${a_1},{a_2},{a_3},........,{a_n},.....$$ are in G.P., then the determinant $$$\Delta = \left| {\matrix{ {\log {a_n}} & {\log {a_{n + 1}}} & {\log {a_{n + 2}}} \cr {\log {a_{n + 3}}} & {\log {a_{n + 4}}} & {\log {a_{n + 5}}} \cr {\log {a_{n + 6}}} & {\log {a_{n + 7}}} & {\log {a_{n + 8}}} \cr } } \right|$$$
is equal to :
A
$$1$$
B
$$0$$
C
$$4$$
D
$$2$$
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