1. Which of these has a negative charge?
Protons Neutrons Electrons Quarks None of these

2. How many significant figures: 408
Answer:

3. Which of these has a neutral charge?
Protons Neutrons Electrons Quarks None of these

4. 26 + 2.001 =
28.0 28.00 28.001 28 All of these

5. What is the SI unit for mass?

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