What is H₂O commonly known as?, a) Oxygen, b) Water , c) Hydrogen, d) Carbon dioxide, What is the hardest natural substance on Earth?, a) Iron, b) Gold, c) Diamond , d) Silver, Who discovered gravity?, a) Albert Einstein, b) Isaac Newton , c) Galileo Galilei, d) Thomas Edison, What is the largest bone in the human body?, a) Skull, b) Femur , c) Spine, d) Rib, Which type of energy is stored in food?, a) Mechanical energy, b) Chemical energy , c) Thermal energy, d) Light energy, Which planet has the most moons?, a) Mars, b) Jupiter , c) Saturn, d) Neptune, Which of these planets has the shortest day?, a) Earth, b) Jupiter , c) Mars, d) Venus, What is the largest organ in the human body?, a) Brain, b) Heart, c) Skin , d) Liver, What is the process of changing a liquid to a gas?, a) Freezing, b) Condensation, c) Evaporation , d) Melting, Which of these is the main source of energy for the Earth?, a) The Moon, b) The Sun , c) The Wind, d) The Ocean.

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