Which of the following plots may represent the thermal energy produced in a resistor in a given time as a function of the electric current?

$A$ coil develops heat of $800 \, cal/sec$ when $20 \, V$ is applied across its ends. The resistance of the coil is .............. $\Omega$ $(1 \, cal = 4.2 \, J)$.

$A$ battery with a $12 \, V$ emf has an initial charge of $80 \, A \cdot h$. If the potential across the terminals stays constant until the battery is completely discharged, then this battery can deliver energy at the rate of $120 \, W$ for a time of: (in $ \, h$)

$A$ $60\,W$ bulb operates on a $220\,V$ supply. The current flowing through the bulb is:

If the current in an electric bulb is changed by $1\%$,then the percentage change in power will be ............. $\%$.

$A$ $5\,^{\circ}\text{C}$ rise in temperature is observed in a conductor by passing a current. When the current is doubled the rise in temperature will be approximately ........... $^{\circ}\text{C}$