6. Which of the following is used for removing air bubbles from glass during its manufacture?
A. Arsenous oxide
B. Potassium carbonate
C. Soda ash
D. Feldspar
7. Which of the following is a protein?
A. Natural rubber
B. Starch
C. Cellulose
D. None of these
8. Wood is the main raw material for the manufacture of
A. paint
B. paper
C. ink
D. gun powder
9. Rayon is chemically
A. cellulose
B. pectin
C. glucose
D. amylase
10. Optic fibres are mainly used for which of the following?
A. Musical instruments
B. Food industry
C. Weaving
D. Communication