What are alloys? How is ‘Brass’ (an alloy) prepared?
What is stainless steel? How is it prepared? Write one important property which makes it more useful in making cooking utensils as compared to its primary metal.

(I) How does electrical conductivity and melting point of a metal change when it is converted to its alloy by mixing a small amount of an element in it?
Analyze the significant changes in printing technology during 19th century in the world.
"ई काशी छोड़कर कहीं न जाएँ" बिस्मिल्ला खाँ के मन में काशी के प्रति विशेष अनुराग के क्या कारण थे ?