Science concept practice

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Ten original introductory questions. This is not an official exam paper.

1. A 2 kg body accelerates at 3 m/s². What is the net force?
   Answer: ___________________________________
2. A resistor has 12 V across it and a resistance of 4 Ω. Find the current.
   Answer: ___________________________________
3. What is the SI unit of energy?
   Answer: ___________________________________
4. How many moles are present in 18 g of water? Use molar mass 18 g/mol.
   Answer: ___________________________________
5. What is the pH of a neutral aqueous solution at 25°C?
   Answer: ___________________________________
6. Which bond involves the sharing of electron pairs?
   Answer: ___________________________________
7. Which organelle is the main site of aerobic ATP production in eukaryotic cells?
   Answer: ___________________________________
8. Which pigment primarily captures light energy for photosynthesis in green plants?
   Answer: ___________________________________
9. Which DNA base pairs with adenine?
   Answer: ___________________________________
10. What is the functional unit of the kidney?
    Answer: ___________________________________