| 1 |
The number of electrons in K shell of O is ________________ |
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| 2 |
According to Bohr, electrons can revolve only in this orbits whose angular momentum is |
- A. h/2π
- B. n 2h/π
- C. n h2/2π
- D. n h/2π
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| 3 |
In ________________ Bohr considered hydrogen atom for his model . |
- A. 1913
- B. 1916
- C. 1917
- D. 1918
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| 4 |
Hydrogen has ________________ isotopes. |
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| 5 |
___________ is used in treatment of cancer. |
- A. Cobalt-60
- B. C-12
- C. H-3
- D. Nil
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| 6 |
Electron ________________ energy when they jump from low to higher level. |
- A. Absorb
- B. Radiate
- C. Nothing
- D. Nil
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| 7 |
In isotopes numbers of ________________ is same. |
- A. Protons
- B. Electrons
- C. Neutrons
- D. Mass number
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| 8 |
"Atoms" means _________ |
- A. Divisible
- B. Indivisible
- C. Break
- D. Nil
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| 9 |
Half life of C-14 ________________ years. |
- A. 5800
- B. 5700
- C. 5600
- D. 5500
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| 10 |
The maximum no.of electrons that can be accommodated in M shell are |
|