1. Which of these has a negligible mass?
Protons Neutrons Electrons Atoms None of these

2. How many electrons in boron-11?
11 5 6 10 None of these

3. Which of these is a mixture?
Uranium Table Salt (NaCl) Iron Steel Water

4. Which of these is not an element?
Uranium Plutonium Iron Gold Brass

5. How many neutrons in carbon-13?
13 0 1 7 6

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