Science Quiz Questions and Answers

1. Which organelle is known as the “powerhouse of the cell”? a) Ribosome b) Nucleus c) Mitochondria d) Endoplasmic Reticulum Answer: c 2. What is the primary function of red blood cells? a) Transport oxygen b) Fight infections c) Produce energy d) Digest food Answer: a 3. Which of the fo...

1. Which organelle is known as the “powerhouse of the cell”? a) Ribosome b) Nucleus c) Mitochondria d) Endoplasmic Reticulum Answer: c 2. What is the primary function of red blood cells? a) Transport oxygen b) Fight infections c) Produce energy d) Digest food Answer: a 3. Which of the following is a nonvascular plant? a) Moss b) Fern c) Oak tree d) Sunflower Answer: a 4. What is the process by which green plants make their food? a) Respiration b) Photosynthesis c) Digestion d) Fermentation Answer: b 5. Which vitamin is essential for blood clotting? a) Vitamin A b) Vitamin K c) Vitamin C d) Vitamin D Answer: b 6. In which part of the digestive system does most nutrient absorption occur? a) Stomach b) Small intestine c) Large intestine d) Esophagus Answer: b 7. Which gas do plants release during photosynthesis? a) Carbon dioxide b) Oxygen c) Nitrogen d) Hydrogen Answer: b 8. What type of joint is present in the human knee? a) Ballandsocket b) Hinge c) Pivot d) Gliding Answer: b 9. Which system in the human body controls and coordinates all functions? a) Respiratory system b) Nervous system c) Digestive system d) Circulatory system Answer: b 10. What is the term for the breaking down of food into simpler substances? a) Digestion b) Photosynthesis c) Respiration d) Excretion Answer: a 11. Which of the following is an example of a physical change? a) Burning of paper b) Melting of ice c) Rusting of iron d) Digestion of food Answer: b 12. Which gas is used in balloons to make them float? a) Oxygen b) Helium c) Carbon dioxide d) Nitrogen Answer: b 13. What is the chemical symbol for gold? a) Ag b) Fe c) Au d) Pb Answer: c 14. What is the pH of a neutral solution? a) 7 b) 1 c) 10 d) 14 Answer: a 15. Which of these substances is the best conductor of electricity? a) Rubber b) Copper c) Wood d) Plastic Answer: b 16. What is the SI unit of force? a) Joule b) Watt c) Newton d) Pascal Answer: c 17. What property of a sound wave determines its pitch? a) Amplitude b) Frequency c) Wavelength d) Speed Answer: b 18. Which type of mirror is used in vehicle headlights? a) Plane b) Concave c) Convex d) Cylindrical Answer: b 19. What is the acceleration due to gravity on Earth? a) 9.8 m/s² b) 8.9 m/s² c) 10.5 m/s² d) 6.7 m/s² Answer: a 20. What is the unit of electrical resistance? a) Ampere b) Ohm c) Volt d) Watt Answer: b Awesome! Here’s Part 3: Questions 21–30 of your science quiz: 21. Which planet is known as the “Red Planet”? a) Venus b) Mars c) Jupiter d) Saturn Answer: b 22. What is the main cause of tides on Earth? a) Sun b) Wind c) Moon’s gravity d) Earth’s rotation Answer: c 23. What is the largest planet in the Solar System? a) Jupiter b) Saturn c) Neptune d) Earth Answer: a 24. Which layer of Earth’s atmosphere contains the ozone layer? a) Stratosphere b) Troposphere c) Mesosphere d) Thermosphere Answer: a 25. What is the Earth’s outermost layer called? a) Mantle b) Core c) Crust d) Lithosphere Answer: c 26. What is the full form of NASA? a) National Aeronautics and Space Administration b) National Astronomical and Space Agency c) North American Space Academy d) None of the above Answer: a 27. Which part of the plant transports water from roots to leaves? a) Phloem b) Xylem c) Stomata d) Chloroplast Answer: b 28. What is the scientific study of fungi called? a) Botany b) Mycology c) Zoology d) Microbiology Answer: b 29. Which part of the brain controls balance and coordination? a) Cerebrum b) Cerebellum c) Medulla d) Hypothalamus Answer: b 30. Which vitamin is produced in the skin when exposed to sunlight? a) Vitamin D b) Vitamin A c) Vitamin C d) Vitamin B12 Answer: a Here comes Part 4: Questions 31–40, featuring modified or conceptually similar questions based on your request. 31. What part of a cell contains genetic material? a) Nucleus b) Mitochondria c) Ribosome d) Cytoplasm Answer: a 32. What is the main role of chloroplasts? a) Store energy b) Absorb light for photosynthesis c) Support the plant d) Transport water Answer: b 33. Which organ is responsible for filtering blood in the human body? a) Heart b) Kidney c) Liver d) Lung Answer: b 34. Which sense organ helps maintain balance? a) Nose b) Ear c) Eye d) Skin Answer: b 35. What is the unit of temperature in the SI system? a) Celsius b) Fahrenheit c) Kelvin d) Centigrade Answer: c 36. Which phenomenon causes the sky to appear blue? a) Reflection b) Refraction c) Scattering d) Diffusion Answer: c 37. What is the function of white blood cells? a) Carry oxygen b) Fight infections c) Produce energy d) Digest food Answer: b 38. What do stomata help the plant with? a) Water absorption b) Gas exchange c) Nutrient transport d) Protection from insects Answer: b 39. Which simple machine is used to raise a flag? a) Lever b) Pulley c) Wedge d) Screw Answer: b 40. Which nutrient helps in bodybuilding? a) Carbohydrates b) Fats c) Proteins d) Vitamins Answer: c 41. What device is used to see microscopic organisms? a) Telescope b) Binoculars c) Microscope d) Periscope Answer: c 42. Which organ system includes the lungs? a) Digestive b) Respiratory c) Circulatory d) Excretory Answer: b 43. What process turns liquid water into vapor? a) Freezing b) Condensation c) Evaporation d) Melting Answer: c 44. What is the boiling point of water at sea level? a) 0°C b) 50°C c) 100°C d) 212°C Answer: c 45. Which planet has the shortest day? a) Earth b) Jupiter c) Mercury d) Neptune Answer: b 46. What is the main organ of the circulatory system? a) Brain b) Kidney c) Heart d) Liver Answer: c 47. What does a thermometer measure? a) Pressure b) Temperature c) Force d) Speed Answer: b 48. What is the basic unit of matter? a) Atom b) Cell c) Molecule d) Element Answer: a 49. Which gas is essential for respiration? a) Carbon dioxide b) Nitrogen c) Oxygen d) Hydrogen Answer: c 50. What does DNA stand for? a) Deoxyribonucleic Acid b) Deoxyribose Nitric Acid c) Dextrose Nucleic Agent d) None of the above Answer: a