Rupee 5 and 10 coins are not made of ...

Rupee 5 and 10 coins are not made of
A. Ferritic stainless steel
B. Silver and steel
C. Cupro nickel alloy
D. Copper and brass

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A copper slab is 2 mm thick. It is protected by a 2 mm layer of stainless steel on both sides. The temperature on one side of this composite slab is 400^(@)C and 200^(@)C on the other side. Value of thermal conductivities are- k_(cu)=400 Wm^(-1)K^(-1) and k_(s)=16 Wm^(-1)K^(-1) (a) Just by knowing that thermal conductivity of steel is much less than copper, find (approximately) the temperature of the copper slab. (b) Plot the variation of temperature across the thickness of the composite wall.

Three rods of copper, brass and steel are welded togeher to from a Y -shaped structure. Area of cross-section of each rod =4 cm^(2) . End of copper rod is maintained at 100^(@)C whereas the ends of brass and steel are at 0^(@)C . Lengths of copper, brass and steel rods are 46, 13 and 12 cm respectively. The rods are thermally insulated from surroundings except at ends. Thermal conductivities of copper, brass and steel are 0.92, 0.26 and 0.12 CGS units respectively. Rate of heat flow through copper rod is

Three rods of Copper, Brass and Steel are welded together to from a Y shaped structure. Area of cross-section of each rod =4cm^2 . End of copper rod is maintained at 100^@C where as ends of brass and steel are kept at 0^@C . Lengths of the copper, brass and steel rods are 46, 13 and 12 cm respectively. The rods are thermally insulated from surroundings excepts at ends. Thermal cunductivities of copper, brass and steel are 0.92, 0.26 and 0.12 CGS units respectively. Rate of heat flow through copper rod is :

Cylinder copper rod of length 1m and a cylinder steel rod of length 1.5m are joined together end to end. The cross sectional area of eac rod is 3.14cm . The free ends of steel rod and copper rods are maintained at 0^(@)C and 100^(@)C respectively. The surfaces of rods are thermally insulated. Find the temperature of copper steel junction. (Given thermal conductivity of steel =46J//m-s.^(@)C and the thermal conductivity of copper =386J//m-s.^(@)C )

A rigid bar of mass 15 kg is supported symmetrically by three wires, each of length 2 m. The wires at the endpoints are made of copper and the middle one is made of steel. If the tension in each wire is the same, then the diameter of copper wire to the diameter of steel wire is ["Given, "Y_("copper")=1.1xx10^(11)"N m"^(-2) and Y_("steel")=1.9xx10^(11)"N m"^(-2)]

Rupee 5 and 10 coins are not made of A. Ferritic stainless steel B. Silver and steel C. Cupro nickel alloy D. Copper and brass

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Rupee 5 and 10 coins are not made of
A. Ferritic stainless steel
B. Silver and steel
C. Cupro nickel alloy
D. Copper and brass