Question

Which of the following are required to cut a glass tube?
(A) Bunsen Burner
(B) Triangular file
(C) Scissor
(D) Only A and B

Answer 1

In order to answer this question, you must be aware about the process of cutting a glass tube. Glass is a delicate material which is used in manufacturing various things. It is an amorphous solid, crystalline structure having tightly packed molecules. Hence glass does not possess a sharp melting point.

Complete answer: The various steps which are involved in the cutting of a glass tube are:
Scratching
Breaking
Heating the cut edges
Cooling

It is required to round off the freshly cut edges of the glass tube or the glass rod. The jagged edges might cause injury while handling, hence for safety and to give a good look with a smooth finish, edges of the glass tube or rod are rounded off. A glass tube is rotated while heating in a burner to ensure the uniform heating of the glass tube. Soda lime glass softens easily.
A Triangular file is any file that has a triangular cross section. The file has three tapered sides for filing the internal surfaces of acutely angled objects.
A Bunsen burner, named after Robert Bunsen, is a common laboratory piece of equipment that creates a single open gas flame for heating, sterilisation, and combustion. For fire polishing, the edges of the glass rod or tube are held in the bunsen burner and are then rotated till both the ends get a good finish (smooth and round).
Hence, A triangular file and a bunsen burner is required to cut a glass tube.
Therefore, Option (D) is correct.

Note:
Certain precautions should always be taken while cutting a glass tube or a rod. Always wear gloves when cutting, fire polishing, or bending glass tubing. Use tongs when heating test tubes. Never hold test tubes in your hand while heating them. Always allow heated materials, including glassware, to cool before handling them.