The value of $\sqrt{(\log_{0.5} 4)^2}$ is

If the difference between the roots of the equation $x^2 + ax + 1 = 0$ is less than $\sqrt{5}$,then what is the set of possible values of $a$?

$S$ and $T$ are the foci of an ellipse and $B$ is an end point of the minor axis. If $\triangle STB$ is an equilateral triangle, then the eccentricity of the ellipse is:

$A$ binary sequence is an array of $0$'s and $1$'s. The number of $n$-digit binary sequences which contain an even number of $0$'s is

Which of the following diseases is caused by a protozoan?

The $RNA$ can be removed by treatment with ............. whereas proteins can be removed by treatment with .............. in the isolation of $DNA$ from a cell.