Here are 50 multiple-choice questions (MCQs) related to everyday science. ### Everyday Science MCQs 1. **What is the primary gas in Earth's atmosphere?** - A) Oxygen - B) Nitrogen - C) Carbon Dioxide - D) Hydrogen **Answer:** B) Nitrogen 2. **Which organ in the human body is primarily responsible for detoxifying chemicals?** - A) Kidney - B) Liver - C) Heart - D) Lungs **Answer:** B) Liver 3. **What is the chemical formula for water?** - A) H2O - B) O2 - C) CO2 - D) H2 **Answer:** A) H2O 4. **What do plants release during photosynthesis?** - A) Oxygen - B) Carbon Dioxide - C) Nitrogen - D) Sulfur **Answer:** A) Oxygen 5. **The unit of force is called:** - A) Joule - B) Newton - C) Watt - D) Pascal **Answer:** B) Newton 6. **At what temperature does water boil at sea level?** - A) 90°C - B) 100°C - C) 110°C - D) 120°C **Answer:** B) 100°C 7. **What is the source of energy for the Sun?** - A) Solar energy - B) Nuclear fusion - C) Chemical reactions - D) Geothermal energy **Answer:** B) Nuclear fusion 8. **Which of the following is a renewable source of energy?** - A) Coal - B) Natural Gas - C) Solar Power - D) Nuclear Energy **Answer:** C) Solar Power 9. **Which vitamin is produced when exposed to sunlight?** - A) Vitamin A - B) Vitamin B12 - C) Vitamin C - D) Vitamin D **Answer:** D) Vitamin D 10. **What is the hardest natural substance on Earth?** - A) Gold - B) Iron - C) Diamond - D) Quartz **Answer:** C) Diamond 11. **Which part of the plant is responsible for photosynthesis?** - A) Roots - B) Stem - C) Leaves - D) Flowers **Answer:** C) Leaves 12. **What is H2O commonly known as?** - A) Hydrogen Peroxide - B) Water - C) Hydrochloric Acid - D) Ammonia **Answer:** B) Water 13. **What is the main component of the human body?** - A) Water - B) Protein - C) Fat - D) Carbohydrates **Answer:** A) Water 14. **Which planet is known as the Red Planet?** - A) Venus - B) Mars - C) Jupiter - D) Saturn **Answer:** B) Mars 15. **Which is the largest organ in the human body?** - A) Liver - B) Skin - C) Heart - D) Brain **Answer:** B) Skin 16. **Who is known as the father of modern physics?** - A) Isaac Newton - B) Albert Einstein - C) Galileo Galilei - D) Nikola Tesla **Answer:** B) Albert Einstein 17. **What device do we use to measure temperature?** - A) Barometer - B) Anemometer - C) Thermometer - D) Ph Meter **Answer:** C) Thermometer 18. **What is the chemical symbol for gold?** - A) Au - B) Ag - C) Pb - D) Fe **Answer:** A) Au 19. **Acid rain is caused primarily by:** - A) Carbon Dioxide - B) Sulfur Dioxide - C) Nitrogen - D) Oxygen **Answer:** B) Sulfur Dioxide 20. **What is the primary function of red blood cells?** - A) Fight infection - B) Clot blood - C) Transport oxygen - D) Digest food **Answer:** C) Transport oxygen 21. **What type of energy is stored in food?** - A) Kinetic energy - B) Thermal energy - C) Chemical energy - D) Electrical energy **Answer:** C) Chemical energy 22. **Which of the following is NOT a planet of our solar system?** - A) Earth - B) Sun - C) Mars - D) Saturn **Answer:** B) Sun 23. **What is the common name for sodium chloride?** - A) Sugar - B) Vinegar - C) Table Salt - D) Baking Soda **Answer:** C) Table Salt 24. **Which animal is known to have a highly developed sense of smell?** - A) Cat - B) Shark - C) Dog - D) Monkey **Answer:** C) Dog 25. **What type of energy is associated with motion?** - A) Potential energy - B) Kinetic energy - C) Thermal energy - D) Nuclear energy **Answer:** B) Kinetic energy 26. **What is the most abundant element in the universe?** - A) Helium - B) Oxygen - C) Hydrogen - D) Carbon **Answer:** C) Hydrogen 27. **What is the main function of the digestive system?** - A) To circulate blood - B) To process food - C) To filter waste - D) To transmit signals **Answer:** B) To process food 28. **Which gas do we exhale during respiration?** - A) Oxygen - B) Nitrogen - C) Carbon Dioxide - D) Methane **Answer:** C) Carbon Dioxide 29. **What type of bond is present in water?** - A) Ionic bond - B) Covalent bond - C) Metallic bond - D) Hydrogen bond **Answer:** B) Covalent bond 30. **Which planet has the most rings?** - A) Jupiter - B) Saturn - C) Neptune - D) Uranus **Answer:** B) Saturn 31. **In which part of the cell does cellular respiration take place?** - A) Nucleus - B) Mitochondria - C) Ribosome - D) Golgi apparatus **Answer:** B) Mitochondria 32. **What is the unit of electrical resistance?** - A) Volt - B) Ohm - C) Ampere - D) Watt **Answer:** B) Ohm 33. **What is the study of living organisms called?** - A) Physics - B) Chemistry - C) Biology - D) Astronomy **Answer:** C) Biology 34. **Which one of these is a conductor of electricity?** - A) Rubber - B) Wood - C) Copper - D) Plastic **Answer:** C) Copper 35. **What is the primary purpose of a vaccine?** - A) To cure disease - B) To prevent disease - C) To treat symptoms - D) To increase metabolism **Answer:** B) To prevent disease 36. **The main source of the Earth’s energy is:** - A) The Moon - B) The Sun - C) The Earth's core - D) Geothermal vents **Answer:** B) The Sun 37. **Which of these is NOT a simple machine?** - A) Lever - B) Pulley - C) Wheel and axle - D) Forklift **Answer:** D) Forklift 38. **What is the scale used to measure the acidity or alkalinity of a solution?** - A) Celsius - B) Richter - C) pH - D) Fahrenheit **Answer:** C) pH 39. **Which type of rock is formed from cooled magma or lava?** - A) Sedimentary - B) Metamorphic - C) Igneous - D) None of the above **Answer:** C) Igneous 40. **What is the main component of the air we breathe?** - A) Oxygen - B) Argon - C) Nitrogen - D) Carbon Dioxide **Answer:** C) Nitrogen 41. **Which type of radiation is used in the microwave oven?** - A) Infrared - B) Radio - C) Ultraviolet - D) Microwave **Answer:** D) Microwave 42. **What part of the human body is mainly affected by lack of Vitamin C?** - A) Bones - B) Teeth - C) Skin - D) Gums **Answer:** D) Gums 43. **What is the circumference of a circle with a radius of 5 cm?** - A) 10π cm - B) 15.7 cm - C) 20π cm - D) 31.4 cm **Answer:** A) 10π cm 44. **Water changes from liquid to gas during a process called:** - A) Precipitation - 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