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Q1.

A composite metal bar of uniform section is made up of length 25 cm of copper, 10 cm of nickel and 15 cm of aluminium. Each part being in perfect thermal contact with the adjoining part. The copper end of the composite rod is maintained at 100o C and the aluminium end at 0o C. The whole rod is covered with belt so that there is no heat loss occurs at the sides. If 
KCu=2KAl and KAl=3KNi, then what will be the temperatures of junctions Cu-Ni and Ni-Al respectively


Q2.

A composite metal bar of uniform section is made up of length 25 cm of copper, 10 cm of nickel and 15 cm of aluminium. Each part being in perfect thermal contact with the adjoining part. The copper end of the composite rod is maintained at 100 C and the aluminium end at 0 C . The whole rod is covered with belt so that there is no heat loss occurs at the sides. If KCa = 2KAl , and KAl = 3KNi , then what will be the temperatures of Cu - Ni and Ni- Al junctions respectively 



Q3.
A metal rod that is 30.0cm long expands by 0.0650cm when its temperature is raised from 0C to 100C . A rod of a different metal and of the same length expands by 0.0350cm for the same rise in temperature . A third rod , also 30.0cm long , is made up of pieces of each of the above metals placed end-to-end and expands 0.0580cm between 0C and 100C . Find the length of each portion of the composite bar .  
Q4.
A metal rod A of 25 cm length expands by 0.050 cm when its temperature is raised from 0C to 100C. Another rod B of a different metal of length 40cm expands by 0.040 cm for the same rise in temperature. A third rod C of 50 cm length is made up of pieces of rods A and B placed end to end expands by 0.03 cm on heating from 0C to 50C. Find the lengths of each portion of the composite rod.
Q5.

Question 13


The photograph given above shows a section of a grille made up of straight and curved iron bars. How would you measure the length of the bars of this section, so that the payment could be made to the contractor?


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