Explain why steel is preferred to copper, brass, aluminium in heavy-duty machines and in structural designs.

Assertion : Steel and brass are more elastic than copper and aluminium Reason: That's why they are preferred in heavy-duty machines and in structural designs.

Explain why it is preferable to use a number of graphite anodes instead of a single electrode during the electrolysis of aluminium.

Explain why thionyl chloride method is preferred for preparing alkyl chlorides from alcohols.

Explain why : Conc. nitric acid can be stored in aluminium containers.

Briefly explain why a gardener prefers to grow certain plants vegetatively ?

Stainless steel cooking pans are preferred with an extra copper bottom. Why?

Why is soft iron preferred to steel in making the core of a transformer?

Three metal rods made of copper, aluminium and brass, each 20 cm long 4cm in diameter, are placed end to end with aluminium between the other two. The free ends of copper and brass are maintained at 100 and 0^(@)C respectively. Assume that the thermal conductivity of copper is twice that of aluminium and four times that of brass. The approximately equilibrium temperatures of the copper-aluminiu and aluminium-brass junctions are respectively.

Assume that the thermal conductivity of copper is twice that of aluminium and four times that of brass. Three metal rods made of copper, aluminium and brass are each 15 cm long and 2 cm in diameter. These rods are placed end to end, with aluminium between the other two. The free ends of the copper and brass rods are maintained at 100^@C and 0^@C respectively. The system is allowed to reach the steady state condition. Assume there is no loss of heat anywhere. When steady state condition is reached everywhere, which of the following statement is true?

Assume that the thermal conductivity of copper is twice that of aluminium and four times that of brass. Three metal rods made of copper, aluminium and brass are each 15 cm long and 2 cm in diameter. These rods are placed end to end, with aluminium between the other two. The free ends of the copper and brass rods are maintained at 100^@C and 0^@C respectively. The system is allowed to reach the steady state condition. Assume there is no loss of heat anywhere. When steady state condition is reached everywhere, which of the following statement is true?