At a common temperature, a block of wood and a block of metal feel equally cold or hot. The temperatures of block of wood and block of metal are
Equal to temperature of the body
Less than the temperature of the body
Greater than temperature of the body
Either $(b)$ or $(c)$
The temperature of hot and cold end of a $20cm$ long rod in thermal steady state are at ${100^o}C$ and ${20^o}C$ respectively. Temperature at the centre of the rod is...... $^oC$
A room is maintained at ${20^o}C$ by a heater of resistance $20$ ohm connected to $200$ volt mains. The temperature is uniform through out the room and heat is transmitted through a glass window of area $1{m^2}$ and thickness $0.2$ cm. What will be the temperature outside ....... $^oC$ ? Given that thermal conductivity $K=0.2$ for glass is and $J = 4.2 J/cal$
Surface of the lake is at $2°C$ . Find the temperature of the bottom of the lake..... $^oC$
Four identical rods of same material are joined end to end to form a square. If the temperature difference between the ends of a diagonal is ${100^o}C$, then the temperature difference between the ends of other diagonal will be ........ $^oC$
Give definition, unit and dimensional formula of thermal conductivity.