If $a > 0$ and $b^2 - 4ac = 0$,then the curve $y = ax^2 + bx + c$

The perimeter of a sector is a constant. If its area is to be maximum,the sectorial angle is:

In which of the following compounds is the transition metal in oxidation state zero?

If $f: R \rightarrow R$ is defined by $f(x) = [x-3] + |x-4|$ for $x \in R$,then $\lim_{x \rightarrow 3^{-}} f(x)$ is equal to

If $\bar{a}=\frac{1}{\sqrt{10}}(3 \hat{i}+\hat{k})$ and $\bar{b}=\frac{1}{7}(2 \hat{i}+3 \hat{j}-6 \hat{k})$,then the value of $(2 \bar{a}-\bar{b}) \cdot ((\bar{a} \times \bar{b}) \times (\bar{a}+2 \bar{b})) = $

Which of the following is not an antibiotic?