Les 7 questions du quiz
Question 1 : Which planet is closest to the Sun?
Réponses possibles :
- Venus
- Earth
- Mars
- Mercury
Explication : Mercure orbite à seulement 58 millions de km du Soleil. Une année mercurienne ne dure que 88 jours terrestres. C'est aussi la plus petite planète du système solaire. Malgré sa proximité avec le Soleil, ce n'est pas la plus chaude : Vénus, avec son effet de serre, détient ce record.
Question 2 : What is the chemical formula for table salt?
Réponses possibles :
- CaCl
- MgCl
- KCl
- NaCl
Explication : Sodium chloride (NaCl) is composed of one sodium atom (Na) and one chlorine atom (Cl). Salt was so precious in ancient times that Roman soldiers were sometimes paid in salt, hence the word "salary" (from Latin salarium).
Question 3 : Which scientist discovered penicillin?
Réponses possibles :
- Louis Pasteur
- Alexander Fleming
- Robert Koch
- Marie Curie
Explication : Alexander Fleming discovered penicillin by accident in 1928 when he observed that a mold was killing bacteria in a forgotten Petri dish, opening the era of antibiotics and saving millions of lives.
Question 4 : What is the chemical symbol for water?
Réponses possibles :
- H2O
- CO2
- O2
- NaCl
Explication : H2O means 2 hydrogen atoms and 1 oxygen atom.
Question 5 : How many chromosomes do humans have?
Réponses possibles :
- 23
- 46
- 48
- 52
Explication : Humans have 23 pairs of chromosomes, or 46 in total. Gametes (sperm and eggs) only have 23.
Question 6 : What is the speed of light in a vacuum?
Réponses possibles :
- 150 000 km/s
- 300 000 km/s
- 450 000 km/s
- 600 000 km/s
Explication : La lumière voyage à environ 300 000 km/s (299 792 458 m/s exactement) dans le vide. C'est une constante fondamentale de l'univers, notée "c".
Question 7 : What gas do we mainly breathe?
Réponses possibles :
- Nitrogen
- Hydrogen
- Oxygen
- Helium
Explication : Air contains about 78% nitrogen and 21% oxygen.
