$A$ bulb is rated at $5.0 \text{ V}, 100 \text{ mA}$. Calculate its
$(i)$ power and $(ii)$ resistance.

Out of the two wires $X$ and $Y$ shown below,which one has greater resistance? Justify your answer.

Resistivity of two elements $A$ and $B$ are $1.62 \times 10^{-8} \, \Omega m$ and $520 \times 10^{-8} \, \Omega m$ respectively. Out of these two,name the element that can be used to make
$(i)$ filament of electric bulb.
$(ii)$ wires for electrical transmission lines. Justify your answer in each case.

$A$ cell,a resistor,a key and an ammeter are arranged as shown in the circuit diagrams of the figure. The current recorded in the ammeter will be

If $R_{1}$ and $R_{2}$ are the resistances of filaments of a $400 \ W$ and a $200 \ W$ lamp,designed to operate on the same voltage,then

$A$ metal has a very large number of free electrons and a non-metal has a very small number of free electrons.