Questions in Current Electricity

Select	Question
	How many calories of heat will be produced approximately in a 210 watt electric bulb in 5 minutes
	$A\,\,{5^o}C$ rise in the temperature is observed in a conductor by passing some current. When the current is doubled, then rise in temperature will be equal to
	If a 2 kW boiler is used everyday for 1 hour, then electrical energy consumed by boiler in thirty days is
	What will happen when a 40 watt, 220 volt lamp and 100 watt, 220 volt lamp are connected in series across 40 volt supply
	What is the ratio of heat generated in R and 2R
	In an electric heater 4 amp current passes for 1 minute at potential difference of 250 volt, the power of heater and energy consumed will be respectively
	Some electric bulbs are connected in series across a 220 V supply in a room. If one bulb is fused then remaining bulbs are connected again in series across the same supply. The illumination in the room will
	The resistor of resistance 'R' is connected to 25 V supply and heat produced in it is 25 J/sec. The value of R is
	Three bulbs of 40 W, 60 W, 100 W are arranged in series with 220 volt supply which bulb has minimum resistance
	If two electric bulbs have 40 W and 60 W rating at 220 V, then the ratio of their resistances will be