General Science Quiz 2026: 10 MCQs with Answers & Explanations

Welcome to the General Science Quiz 2026! Test your knowledge across physics, chemistry, biology, and general science concepts with these 10 carefully crafted MCQs. Each question includes detailed explanations.

General Science Quiz – 10 MCQs

1. 1. What is the chemical symbol for Gold?
   A) Ag
   B) Au
   C) Fe
   D) Cu
   Answer: B) Au
   Explanation: Au is the chemical symbol for Gold, derived from the Latin word ‘Aurum’. Gold is a precious metal with atomic number 79.
2. 2. Which gas is most abundant in Earth’s atmosphere?
   A) Oxygen
   B) Carbon Dioxide
   C) Nitrogen
   D) Argon
   Answer: C) Nitrogen
   Explanation: Nitrogen makes up about 78% of Earth’s atmosphere, making it the most abundant gas. Oxygen accounts for approximately 21%.
3. 3. What is the speed of light in vacuum?
   A) 300,000 km/s
   B) 150,000 km/s
   C) 500,000 km/s
   D) 1,000,000 km/s
   Answer: A) 300,000 km/s
   Explanation: The speed of light in vacuum is approximately 299,792 km/s, often rounded to 300,000 km/s. It is a fundamental constant in physics.
4. 4. Which organ in the human body produces insulin?
   A) Liver
   B) Kidney
   C) Pancreas
   D) Stomach
   Answer: C) Pancreas
   Explanation: The pancreas produces insulin, a hormone that regulates blood sugar levels. Insulin deficiency leads to diabetes.
5. 5. What is the hardest natural substance on Earth? A) Gold B) Iron C) Diamond D) Quartz Answer: C) Diamond Explanation: Diamond is the hardest natural substance on Earth, with a rating of 10 on the Mohs hardness scale.
6. 6. Which planet is known as the Red Planet?
   A) Venus
   B) Mars
   C) Jupiter
   D) Saturn
   Answer: B) Mars
   Explanation: Mars is called the Red Planet due to iron oxide (rust) on its surface, giving it a reddish appearance.
7. 7. What is the pH value of pure water?
   A) 5
   B) 7
   C) 9
   D) 11
   Answer: B) 7
   Explanation: Pure water has a pH of 7, which is considered neutral. Values below 7 are acidic, and above 7 are alkaline.
8. 8. Which vitamin is produced when skin is exposed to sunlight?
   A) Vitamin A
   B) Vitamin C
   C) Vitamin D
   D) Vitamin E
   Answer: C) Vitamin D
   Explanation: Vitamin D is synthesized in the skin when exposed to ultraviolet B (UVB) rays from sunlight.
9. 9. What is the unit of electric current?
   A) Volt
   B) Watt
   C) Ampere
   D) Ohm
   Answer: C) Ampere
   Explanation: The ampere (A) is the SI unit of electric current, named after French physicist Andre-Marie Ampere.
10. 10. Which blood type is known as the universal donor?
    A) Type A
    B) Type B
    C) Type AB
    D) Type O Negative
    Answer: D) Type O Negative
    Explanation: Type O Negative blood can be given to patients of any blood type, making it the universal donor type.