Which of the following is not an isotope of hydrogen?

Which of the following is a chlorinated hydrocarbon?

Which type of circulatory system is shown in the given figure?

The vectors $b$ and $c$ are in the direction of north-east and north-west respectively and $|b|=|c|= 4$. The magnitude and direction of the vector $d = c - b$ are:

The Poisson's ratio of a material is $0.5$. If a force is applied to a wire of this material,there is a decrease in the cross-sectional area by $4 \%$. The percentage increase in the length is ........ $\%$

If $y$ is a function of $x$ and $\log(x+y) = 2xy$,then the value of $y'(0)$ is