If $F_1$ and $F_2$ are the relative strengths of the gravitational and weak nuclear forces respectively, then $\frac{F_2}{F_1}$ is nearly

The two principal thrusts in physics are

Match List-$I$ with List-$II$ and select the correct answer.

List-$I$	List-$II$
$A$. Spring constant	$1$. $M^1L^2T^{-2}$
$B$. Pascal	$2$. $M^0L^0T^{-1}$
$C$. Hertz	$3$. $M^1L^0T^{-2}$
$D$. Joule	$4$. $M^1L^{-1}T^{-2}$

Which relation is wrong?

In the context of accuracy of measurement and significant figures in expressing results of experiment,which of the following is/are correct?
$(1)$ Out of the two measurements $50.14 \, cm$ and $0.00025 \, A$,the first one has greater accuracy.
$(2)$ If one travels $478 \, km$ by rail and $397 \, m$ by road,the total distance travelled is $478 \, km$.

The difference in the lengths of a mean solar day and a sidereal day is about........$min$.