Atoms

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Question

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Question 1 :

An atom stays in an excited state for about ____________

1. 10 nano seconds
2. 10 milli seconds
3. 10 micro seconds
4. 10 seconds
Answer
8832

Question 2 : The energy equivalent to one atomic mass unit is ___________
1. 931 MeV
2. 9.31 MeV
3. 6.02 × 1023 J
4. 1.6 × 10-19 J
Answer
8833

Question 3 : The mass of a neutron is ____________
1. 0.1866 u
2. 1.866 u
3. 1.0866 u
4. 1.00866 u
Answer
8834

Question 4 : Isobars have the same ______________
1. Z
2. N
3. A
4. None of these
Answer
8835

Question 5 : The concept of electron spin was introduced by _______________
1. Uhlenbeek and Goudsmit
2. Becquerel
3. Goudsmit
4. Millikan
Answer
8836