Question

plz answer the questions​

Answer 1

Answer:

Sorry dear. I only know answer of first question :

Heating is the method

Explanation:

For fixing the metal ring on a wooden ring. The metal ring is made slightly smaller than the wooden ring. On heating, the metal ring expands and fits onto the wooden ring. Cold water is then poured over the metal ring, which contracts and fits tightly onto the wooden ring.

I HOPE U YOU WILL FIND THIS A LITTLE HELPFUL.