1. What is the hardest natural substance on Earth as listed?

• Quartz

• Diamond

• Topaz

• Iron

2. What is the biggest planet in our solar system?

• Jupiter

• Saturn

• Mars

• Venus

3. What is the smallest planet in our solar system?

• Neptune

• Jupiter

• Mercury

• Mars

4. Oil, natural gas and coal are examples of ...

• Fossil fuels

• Renewable resources

• Geothermal resources

• Bio fuels

5. Who is the first president of America?

• Richard Nixon

• Bill Clinton

• Geogre Washington

• Abraham Lincoln

6. Who is the first person to step on the moon?

• Neil Amstrong

• Buzz Aldrin

• Yuri Gagarin

• Pham Tuan

7. How old is the earth?

• 4 billion years

• 4.52 billion years

• 4.54 billion years

• 5 billion years

8. When did the Vietnam War end?

• 1945

• 1954

• 1972

• 1975

9. What is the day when the North and South Vietnam was united?

• Payday

• Reunification Day

• Labour Day

• Valentine Day

10. Who was the nationalist leader who led Vietnam against the French?

• Vo Nguyen Giap

• Tran Hung Dao

• Ly Thuong Kiet

• Ho Chi Minh