$(a)$ Mention the colour code used for live,neutral,and earth wire.
$(b)$ You want to connect a $2 \ kW$ electric oven in the electric circuit. In which power line would you connect it and why? What may happen if you connect it wrongly in the other power line?

(N/A) The standard colour code for wires is: Live wire is $Red$,Neutral wire is $Black$,and Earth wire is $Green$.
$(b)$ $A$ $2 \ kW$ electric oven should be connected to the $15 \ A$ power line (high-power circuit). This is because the oven draws a large amount of current $(I = P/V = 2000 \ W / 220 \ V \approx 9.09 \ A)$. If it is connected to the $5 \ A$ lighting circuit,the excessive current will cause the fuse to blow or the circuit breaker to trip,potentially damaging the wiring or causing a fire hazard.