| 1 |
Deuterium is used to make:<br> |
- A. light water <br>
- B. heavy water<br>
- C. soft water<br>
- D. hard water<br>
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| 2 |
Hydrogen has ________________ isotopes. |
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| 3 |
Energy of a shell is ________________ |
- A. Variable
- B. Constant
- C. Cannot be changed
- D. Nil
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| 4 |
The number of isotopes of carbon are |
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| 5 |
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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| 6 |
L shell can accommodate ________________ electrons. |
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| 7 |
Which of the following result in discovery of proton?<br> |
- A. cathode rays<br>
- B. canal rays <br>
- C. x-rays <br>
- D. alpha rays<br>
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| 8 |
Atoms of elements combine chemically to form:<br> |
- A. Mixtures<br>
- B. compounds<br>
- C. solutions <br>
- D. ions<br>
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| 9 |
For diagnosis of goiter in thyroid gland we use |
- A. Co-60
- B. C-14
- C. I-131
- D. Sr-90
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| 10 |
The no.of neutrons in deutrium is |
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