In the given circuit diagram,the galvanometer reading is zero. If the internal resistance of the cell is neglected,then the value of $X$ is ......... $\Omega$.

$A$ cell of emf $6\, V$ and internal resistance $0.5\, \Omega$ is short-circuited. The current in the cell is ............... $A$.

If $X, Y$ and $Z$ in the figure are identical lamps,which of the following changes to the brightness of the lamps occur when switch $S$ is closed?

In the adjacent circuit,a voltmeter of internal resistance $R$,when connected across $B$ and $C$,reads $\frac{100}{3} \text{ V}$. Neglecting the internal resistance of the battery,the value of $R$ is:

In the given network,the current through branch $BG$ is almost equal to ............ $A$.

$A$ car has a fresh battery of $e.m.f.$ $12\, V$ and internal resistance of $0.05\, \Omega$. If the starter motor draws a current of $90\, A$,the terminal voltage when the starter is on will be ............... $V$.