31. What is the hardest mineral on the Mohs scale?
a) Quartz
b) Diamond
c) Topaz
d) Corundum
Answer: b) Diamond
32. Which mineral is commonly used as a lubricant?
a) Graphite
b) Calcite
c) Halite
d) Feldspar
Answer: a) Graphite
33. Which mineral is commonly used in toothpaste as an abrasive?
a) Quartz
b) Feldspar
c) Calcite
d) Gypsum
Answer: c) Calcite
34. Which mineral is the primary component of sand?
a) Quartz
b) Feldspar
c) Mica
d) Olivine
Answer: a) Quartz
35. Which mineral is commonly used in insulation and as a fire retardant?
a) Talc
b) Gypsum
c) Asbestos
d) Halite
Answer: c) Asbestos
