Sapphire (Corundum) MCQs

 

Sapphire (Corundum): Interactive MCQ Quiz

Choose one answer for each question, then select Submit Quiz. Your score and explanations will appear below. Incorrect and unanswered questions include an explanation of the correct answer.

1. Which gem-quality corundum does the book call sapphire?

Only blue corundum Corundum that is not red Only colorless corundum Red corundum of any quality

2. Which impurities does the book connect with sapphire’s color variation?

Chromium and manganese Nickel and copper Iron and chromium Iron and titanium

3. Which sapphire color does the book call the most valuable?

Clear, deep blue Nearly black Metallic blue Colorless

4. What does the book say about color-change sapphire?

It changes from blue to red when heated It becomes colorless in sunlight It shows different shades of blue in artificial and natural light It is always metallic blue

5. What color and locality does the book associate with the best Indian sapphire?

Dark brown, Thailand Cornflower blue, Kashmir Metallic blue, Montana Pale blue, Brazil

6. Which localities are associated with dark blue, nearly black sapphire?

Myanmar, Sri Lanka, and India Cambodia, Brazil, and Kenya Russia, Malawi, and Colombia Thailand, Australia, and Nigeria

7. What can rutile inclusions produce in a sapphire cabochon?

A six-rayed star effect A cat’s-eye effect only A permanent color change A metallic luster

8. Which set of countries does the book list for good-quality sapphire?

Brazil, Egypt, and Norway Australia, Kenya, and Spain Myanmar, Sri Lanka, and India Canada, Mexico, and Germany

9. When did synthetic sapphire production begin, according to the book?

In the Middle Ages In the late 19th century In 1902 only In the late 20th century

10. Which set of properties matches sapphire in the book?

Silicon dioxide, trigonal, hardness 7 Beryllium aluminum silicate, hexagonal, hardness 7½ Calcium phosphate, hexagonal, hardness 5 Aluminum oxide, trigonal, hardness 9