Thermal Propert...

If rc and rs respectively represents cuticular and stomatal resistance, the total resistance (R) could be expressed as

There are two lead spheres, the ratio c being $$1 : 2$$. If both are at the same tempe then ratio of heat contents is

Producers gas is a mixture of

In a room there are four objects a wooden dish, steel dish, glass dish and a copper dish. If a fire is lit in the room so that it burns at 300 degrees centigrade, and is equidistant from all the four dishes, then after a long time the dishes can be listed in the increasing order of temperature. Which is the correct order of temperature of dishes?

At pressure P and absolute temperature T a mass M of an ideal gas fills a closed container of volume V. An additional mass 2M of the same gas is added into the container and the volume is then reduced to $$\dfrac{v}{3}$$ and the temperature to $$\dfrac{T}{3}.$$ The pressure of the gas will now be :

The rate of heat conduction is proportional to the cross-sectional area and temperature
gradient (temperature difference per unit length). On a typical day during the World Cup
tournament in South Africa, the air in a room is heated to $$25^{o}C$$ while the air outside is
$$-2^{o}C$$. The area of the window of the room is
$$2 m^{2}$$ and it is made of crown glass with
thickness 2 mm and thermal conductivity
$$1.0 WK^{-1}m^{-1}$$. What is the heat power loss
through the window?

A rigid container has a hole in its wall. When the container is evacuated, its weight is 100 gm. When someair is filled in it at 27C, its weight becomes 200 gm. Now the temperature of air inside is increased by $$\Delta$$ T, the weight becomes 150 gm. $$\Delta$$ T should be :

A cuboid $$ABCDEFGH$$ is anisotropic with $$\alpha _{x}=1 \times 10^{-5} /^\circ C,\:\alpha _{y}=2 \times 10^{-5} /^\circ C,\:\alpha _{z}=3 \times 10^{-5} /^\circ C$$. Coefficient of superficial expansion of faces can be

A vessel of volume 4 litres contains a mixture of 8 g of O$$_2$$, 14 g of N$$_2$$ and 22g of CO$$_2$$ at 27$$^o$$C. The pressure exerted by the mixture is

A vessel contains $$1$$ mole of O$$_2$$ (molar mass $$ 32 gm$$) at a temperature $$T$$. The pressure is $$P$$. An identical vessel containing $$1$$ mole of He (molar mass $$4 gm$$) at a temperature $$2T$$ has a pressure :