Thermal Propert...

A glass flask is filled up to a mark with $$50\ cc$$of mercury at $${18}^{o}C$$. If the flask and content are heated to $${38}^{o}C$$, how much mercury will be above the mark? ($$\alpha$$ for glass is $$9\times { { 10 }^{ -6 } }/{ C }$$ and coefficient of real expansion of mercury is $$180\times { { 10 }^{ -6 } }/{ C })$$

$$0.1\,{m^3}$$ of water at $$80^\circ C$$ is mixed with $$0.3\,{m^3}$$ of water at $$60^\circ C$$. The final temperature of the mixture is :

When $$500 kg$$ of water is heated from $$20^oC$$ to $$100^oC$$, then the increase in mass of water will be

Ratio of radius of curvature of cylindrical emitters of same type is $$1:4$$ and their temp. are in ration $$2:1$$. Then ration of amount of heat emitted by them is-(For Cylinder length = radius);-

Q.1 the frame is made by seven meter wire, each has conductivity K. length of each segment is $$ \ell $$ l 2. The temperature of points E,F and A are maintained at $$ 160^o $$ c,$$ 200^oC $$ and $$ 100^oC $$ respectively.(assume heat flows through the wire only and there is no loss of heat from the side of the wire).Then the tempera-ture at C is ( approx).

Temperature of a room is maintained at $$20^{\circ}$$ by a heater of power $$2\ kW$$. The room has a glass window of area $$1\ m^{2}$$, thickness $$0.2\ cm$$ and thermal conductivity $$0.2\ cal/m/^{\circ}C/s$$. Temperature of outside is about.

An ideal gas has an initial volume $$V$$ and pressure $$P$$. In doubling its volume the minimum work done will be in (of the given processes):

In case of heat flow across the composite rod shown above, temperature $$\theta$$ is

A vessel contains 28 gm of $$N-2$$ and 32 gm of $$O_2$$ at temperature T = 1800 K and pressure 2 atm pressure it $$N_2$$ dissociates $$30%$$ and $$O_2$$ dissociates $$50%$$ if temperature remains constant. 

Which of the following statements is true for a thermometer?