ISRO Scientist or Engineer Mechanical 2012

Instructions

For the following questions answer them individually

ISRO Scientist or Engineer Mechanical 2012 - Question 41


Rank of the matrix
$$ A = \begin{bmatrix}1 & 1 & 2 \\1 & 2 & 3 \\ 0 & -1 & 1 \end{bmatrix} $$ is

ISRO Scientist or Engineer Mechanical 2012 - Question 42


The value of $$t$$ for which $$A + tB$$ is perpendicular to $$C$$ where $$A = i + 2j + 3k, B = -i + 2j + k$$ and $$C = 3i + j$$

ISRO Scientist or Engineer Mechanical 2012 - Question 43


$$ \overline{A} \times \overline{B} $$ is a vector

ISRO Scientist or Engineer Mechanical 2012 - Question 44


The equation of the plane through the line $$ \frac {x - 1}{3} = \frac {y - 4}{2} = \frac {z - 4}{-2} $$ and parallel to the line $$ \frac {x + 1}{2} = \frac {y - 1}{-4} = \frac {z + 2}{1} $$ is

ISRO Scientist or Engineer Mechanical 2012 - Question 45


Let $$E$$ and $$F$$ be any two events with $$4 P(E \cup F) = 0.8, P(E) = 0.4$$ and $$P (E/F) = 0.3$$.Then $$(F)$$ is .

ISRO Scientist or Engineer Mechanical 2012 - Question 46


The approximate value of y(0.1) from $$\frac {dy} {dx} = x^2 y-1, y(0) = 1$$ is

ISRO Scientist or Engineer Mechanical 2012 - Question 47


1+ i is equivalent to

ISRO Scientist or Engineer Mechanical 2012 - Question 48


In a class of 45 students, the mean mark of 25 girls is 32 and the mean mark of 20 boys is 27.5. What is the class mean?

ISRO Scientist or Engineer Mechanical 2012 - Question 49


If $$ L \left\{ f(t) \right\} = F (s),$$ then the value of $$ L \left\{ e^{-at} f(t) \right\} $$ is

ISRO Scientist or Engineer Mechanical 2012 - Question 50


The probability that A happens is $$\frac{1}{3}$$. The odds against happening of A are

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