WBJEE 2014 Physics Solved Paper

A 10 watt electric heater is used to heat a container filled with 0.5 kg of water. It is found that the temperature of waterand the container rises by 3° K in 15 minutes. The contain r is then emptied, dried and filled with 2 kg of oil. The sameheater now raises the temperature of container-oil system by 2°K in 20 minutes. Assuming that there is no heat lossin the process and the specific heat of water as 4200 Jkg–1K– , the specific heat of oil in the same unit is equal to