71. What is the chemical symbol for oxygen? - a) O - b) O2 - c) Ox - d) O3 - **Answer: a) O** 72. Which planet is known for its great red spot? - a) Mars - b) Jupiter - c) Saturn - d) Neptune - **Answer: b) Jupiter** 73. What is the main component of natural gas? - a) Methane - b) Ethane - c) Propane - d) Butane - **Answer: a) Methane** 74. Which part of the cell contains genetic material? - a) Cytoplasm - b) Cell membrane - c) Nucleus - d) Ribosome - **Answer: c) Nucleus** 75. What is the process by which a liquid changes into a solid? - a) Melting - b) Freezing - c) Evaporation - d) Condensation - **Answer: b) Freezing** 76. What is the SI unit of force? - a) Joule - b) Newton - c) Watt - d) Pascal - **Answer: b) Newton** 77. What is the study of heredity and variation in organisms? - a) Ecology - b) Genetics - c) Physiology - d) Anatomy - **Answer: b) Genetics** 78. Which gas is released during the process of photosynthesis? - a) Carbon dioxide - b) Oxygen - c) Nitrogen - d) Methane - **Answer: b) Oxygen** 79. What is the chemical formula for ammonia? - a) NH3 - b) NH4 - c) NO3 - d) NO2 - **Answer: a) NH3** 80. What type of energy is stored in a stretched rubber band? - a) Kinetic energy - b) Thermal energy - c) Chemical energy - d) Potential energy - **Answer: d) Potential energy** 81. What is the primary function of the chloroplast in plant cells? - a) Store water - b) Perform photosynthesis - c) Provide support - d) Reproduce - **Answer: b) Perform photosynthesis** 82. What is the common name for the substance NaCl? - a) Sugar - b) Salt - c) Baking soda - d) Vinegar - **Answer: b) Salt** 83. Which organ is responsible for pumping blood throughout the body? - a) Liver - b) Brain - c) Heart - d) Lungs - **Answer: c) Heart** 84. What is the smallest particle of a chemical element that retains its chemical properties? - a) Molecule - b) Atom - c) Electron - d) Proton - **Answer: b) Atom** 85. What does RNA stand for? - a) Ribonucleic Acid - b) Ribosomal Nucleic Acid - c) Ribonucleotide Acid - d) Ribonucleosome Acid - **Answer: a) Ribonucleic Acid** 86. What is the name of the galaxy that contains our Solar System? - a) Andromeda - b) Milky Way - c) Triangulum - d) Sombrero - **Answer: b) Milky Way** 87. What is the chemical formula for sulfur dioxide? - a) SO2 - b) SO3 - c) S2O - d) S2O3 - **Answer: a) SO2** 88. Which vitamin is produced when the skin is exposed to sunlight? - a) Vitamin A - b) Vitamin B - c) Vitamin C - d) Vitamin D - **Answer: d) Vitamin D** 89. What is the process by which plants release water vapor into the air? - a) Photosynthesis - b) Transpiration - c) Respiration - d) Germination - **Answer: b) Transpiration** 90. What is the name of the force that opposes the motion of objects through the air? - a) Gravity - b) Friction - c) Air resistance - d) Magnetism - **Answer: c) Air resistance** 91. What is the term for the amount of matter in an object? - a) Weight - b) Volume - c) Density - d) Mass - **Answer: d) Mass** 92. What is the name of the process by which cells divide to produce two identical daughter cells? - a) Meiosis - b) Mitosis - c) Binary fission - d) Budding - **Answer: b) Mitosis** 93. What is the chemical symbol for chlorine? - a) Cl - b) Ch - c) Cr - d) Cn - **Answer: a) Cl** 94. Which part of the cell is responsible for producing energy? - a) Nucleus - b) Ribosome - c) Chloroplast - d) Mitochondria - **Answer: d) Mitochondria** 95. What is the term for a reaction that absorbs energy from its surroundings? - a) Exothermic - b) Endothermic - c) Combustion - d) Neutralization - **Answer: b) Endothermic** 96. What is the main gas found in the Earth's atmosphere? - a) Oxygen - b) Carbon dioxide - c) Nitrogen - d) Hydrogen - **Answer: c) Nitrogen** 97. What is the chemical formula for hydrochloric acid? - a) H2SO4 - b) HNO3 - c) HCl - d) H2O - **Answer: c) HCl** 98. What is the term for the study of insects? - a) Entomology - b) Ornithology - c) Herpetology - d) Ichthyology - **Answer: a) Entomology** 99. What is the main function of the kidneys in the human body? - a) Produce hormones - b) Filter blood - c) Fight infections - d) Store energy - **Answer: b) Filter blood** 100. What is the chemical formula for methane? - a) CH3 - b) C2H6 - c) CH4 - d) C3H8 - **Answer: c) CH4**