1. Which of the following is necessary for burning (combustion)?   Carbon   Nitrogen   Petrol   Oxygen   Hint Half-n-half Clue   2. Enzymes and anti-bodies are mainly made of   Carbohydrates   Proteins   Vitamins   Fats   Half-n-half Clue   3. What is the total number of bones in the human body?   32   196   206   512   Half-n-half Clue   4. The Earth is surrounded by an insulating blanket of gases which protects it from the light and heat of the Sun. This insulating layer is called the   Atmosphere   Hydrosphere   Lithosphere   Biosphere   Half-n-half Clue   5. Where is the Sea of Tranquility?   In the Atlantic Ocean   In the Pacific Ocean   Near the Bermuda Triangle   On the Moon   Half-n-half Clue   6. Which of the following has an organic origin?   Sand   Nylon   Bakelite   Coal   Half-n-half Clue   7. The atom is made of   Protons and Quarks   Protons, Neutrons and Electrons   Positrons, Neutrons and Electrons   Neutrinos, Gamma Rays and Positrons   Half-n-half Clue