Question 1: What is the main function of a vacuum in insulated mugs?
Cools the drink
Adds extra heat
Prevents heat transfer
Correct Answer: Prevents heat transfer
Question 2: What material is commonly used inside insulated mugs?
Stainless steel
Wood
Plastic
Correct Answer: Stainless steel
Question 3: Why do some insulated mugs have a copper lining?
To keep drinks fizzy
To reflect heat
To change color
Correct Answer: To reflect heat