The dimensions of the coefficient of thermal conductivity are
- 7 hours
- 14 hours
- More than 7 hours
- Less than 7 hours
- 5 : 6
- 2 : 1
- 6 : 5
- 3 : 1
An ice box used for keeping eatable cold has a total wall area of 1metre2 and a wall thickness of 5.0 cm. The thermal conductivity of the ice box is K=0.01joule/metre−∘C. It is filled with ice at 0∘ along with eatables on a day when the temperature is 30∘. The latent heat of fusion of ice is 334×103joules/kg . The amount of ice melted in one day is
(1 day =86, 400 seconds )
- 776 gms
- 7760 gms
- 1552 gms
- 11520 gms
Choose the correct statements(s) from the following:
A temperature change which increases the length of a steel rod by 0.1% will increase its volume by nearly 0.3%
The specific heat of a solid is different when the solid is heat at (a) constant pressure and (b) the constant volume
The thermal conductivity of air being less than for wool, we prefer wool to air for thermal insulation.
When the distance between two fixed points is measured with a steel tape, the observed reading will be less on a hot day than on a cold day.
A slab of stone of area 0.34m2 and thickness 10 cm is exposed on the lower face to steam at 100∘C. A block of ice at 0∘C rests on the upper face of the slab. In one hour, 3.6 kg of ice is melted. Assume that the heat loss from the sides is negligible. The latent heat of fusion of ice is 3.4×104Jkg−1. What is the thermal conductivity of the stone in units of Js−1m−1C−1?
Five rods of same dimensions are arranged as shown in the figure. They have thermal conductivities K1, K2, K3, K4 and K5. When points A and B are maintained at different temperatures, no heat flows through the central rod if
What is the SI unit of the coefficient of thermal conductivity?