A student performs an experiment for determination of $g\left(=\frac{4{\mathrm{\pi }}^{2}l}{T^2}\right)$, $l\approx 1 \mathrm{m}$ and he commits an error of $∆l$. For $T$ he takes the time of $n$ oscillations with the stopwatch of least count $∆T$ and he commits a human error of $0.1 \mathrm{s}$. For which of the following data, the measurement of $g$ will be most accurate?

A physical quantity $P$ is described by the relation $P=a^{\frac{1}{2}} b^2 c^3{d}^{-4}$. If the relative errors in the measurement of $a$, $b$, $c$ and $d$ respectively, are $2\%$, $1\%$, $3\%$ and $5\%$. Then the relative error in $P$ will be:

Two students $P$ and $Q$ perform an experiment to verify Ohm's law for a conductor with resistance $R$. They use a current source and a voltmeter with the least counts of $0.1 \mathrm{mA}$ and $0.1 \mathrm{mV}$, respectively. The plots of the variation of voltage drop $V$ across $R$ with current $I$ for both are shown below.

The statement which is most likely to be correct?