General Science Questions and Answers | Useful for Students & Exams

General Science – Questions and Answers

Q1: What is the boiling point of water?

Answer: 100°C (212°F) at sea level.

Q2: What gas do plants use during photosynthesis?

Answer: Carbon dioxide (CO₂).

Q3: Which part of the plant conducts photosynthesis?

Answer: The leaves.

Q4: What is the hardest natural substance on Earth?

Answer: Diamond.

Q5: Which planet is known as the Red Planet?

Answer: Mars.

Q6: What is the basic unit of life?

Answer: The cell.

Q7: How many bones are there in an adult human body?

Answer: 206 bones.

Q8: What causes day and night?

Answer: The rotation of the Earth on its axis.

Q9: What is the main source of energy for Earth?

Answer: The Sun.

Q10: Which gas is essential for respiration?

Answer: Oxygen (O₂).

Q11: What is the scientific name of water?

Answer: H₂O.

Q12: Which planet has the largest number of moons?

Answer: Saturn.

Q13: What is the unit of electric current?

Answer: Ampere (A).

Q14: Which organ purifies our blood?

Answer: The kidneys.

Q15: Which vitamin is produced in the skin when exposed to sunlight?

Answer: Vitamin D.

Q16: Which organ controls all the functions of the body?

Answer: The brain.

Q17: What is gravity?

Answer: It is a force that pulls objects toward the Earth.

Q18: Which gas do humans exhale?

Answer: Carbon dioxide (CO₂).

Q19: What is the largest organ in the human body?

Answer: The skin.

Q20: How many planets are there in our solar system?

Answer: Eight planets.