Answer:
Tuba - Alloy
Paper - Polymer
Pot - Ceramics
Step-by-step explanation:
Alloy : An alloy is a substance which made up of two more than two types of metal.It is uniform solid substance. For example : brass, steel etc
Ceramics: Articles , figures made up of clay which are hardened by the action of heating. For example : pots, crockery etc.
Polymer: These are the substance composed repeating units of of same chemical units which held together by covalent bonds.The single chemical unit is known as monomer. For example : plastic , rubber etc.
Tuba is an musical instrument similar made up of brass. And brass is an alloy of copper and zinc. Hence, an alloy.
Paper is majorly made up of wood pulp.And Wood pulp consists cellulose which is a polymer of glucose molecule.Hence, polymer.
Pot is made up of clay and heated to hardened them.Hence, ceramics.