Two resistors whose values are in the ratio $2 : 1$ are connected in parallel with one cell. The ratio of power dissipated is:

In the given circuit,if the measuring instruments are ideal,then the reading of ammeter $A_1$ is:

Two equal resistances,$400 \Omega$ each,are connected in series with an $8 V$ battery. If the resistance of the first one increases by $0.5 \%$,what is the change required in the resistance of the second one in order to keep the potential difference across it unaltered?

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?

$A$ voltmeter of resistance $1000\,\Omega$ is connected across a resistance of $500\,\Omega$ in the given circuit. What will be the reading of the voltmeter in $V$?

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: