21. Which mineral is commonly used in the production of paper?
a) Quartz
b) Gypsum
c) Halite
d) Calcite
Answer: b) Gypsum
22. Which mineral is used in the production of batteries for electric vehicles?
a) Lithium carbonate
b) Pyrite
c) Barite
d) Halite
Answer: a) Lithium carbonate
23. What mineral is used to make computer chips?
A) Quartz
B) Feldspar
C) Copper
D) Silicon
Answer: D) Silicon
24. What mineral is the main component of rubies and sapphires?
A) Quartz
B) Feldspar
C) Corundum
D) Topaz
Answer: C) Corundum
25. What mineral is used to make aluminum?
A) Quartz
B) Feldspar
C) Bauxite
D) Olivine
Answer: C) Bauxite
