Engineering :: Nuclear Engineering
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| 101. |
The half-life period t 1/2 of a radioactive element is N years. The period of its complete decay is |
| A. |
2N years |
B. |
N2 years |
| C. |
N2 years |
D. |
infinity |
Answer: Option D
Explanation:
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| 102. |
The half-life period may be best determined by |
| A. |
nothing the weight loss over a period of time |
B. |
measuring the volume of helium liberated |
| C. |
by counting the number of alpha particles emitted per second in a Geiger Muller Counter from a known amount |
D. |
Calculations based upon the chemical equation for the radioactive disintegration |
Answer: Option C
Explanation:
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| 103. |
The value of disintegration constant (k) of a radioactive isotope |
| A. |
decreases with increasing pressure |
B. |
increases with increasing temperature |
| C. |
increases with increasing concentration |
D. |
is independent of temperature concentration or pressure |
Answer: Option D
Explanation:
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| 104. |
The disintegration constant of a radioactive element is 2.31 x 10-10 years. Its half-life period is about |
| A. |
1.15 x 10-10 years |
B. |
3 x 109 years |
| C. |
4 x 109 years |
D. |
4 x 10-9 years |
Answer: Option B
Explanation:
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| 105. |
Select the false statement |
| A. |
A definite fraction of a radioactive substance disintegrates in a definite time |
B. |
The half-life time is independent of initial concentration of substance |
| C. |
Radioactive disintegration constant is independent of temperature |
D. |
If the half-life time is 1580 years the complete disintegration will take place in 3160 years. |
Answer: Option D
Explanation:
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| 106. |
A certain nuclide has a half-life of 40 days. If a sample containing 800 atoms is allowed to decay for 120 days how many atoms will remain undecayed? |
Answer: Option B
Explanation:
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| 107. |
The half-life period of a radioactive isotope is 24 days. It would be 75% decomposed in |
| A. |
12 days |
B. |
24 days |
| C. |
36 days |
D. |
40 days |
Answer: Option D
Explanation:
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| 108. |
If the half-life period of a radioactive metal 1 month then |
| A. |
the metal will have completely disintegrated in two months |
B. |
7/8th of the metal will have disintegrated at the end of 3 months |
| C. |
1/8th of the metal will remain intact at the end of 4 months |
D. |
the metal will have completely disintegrated in 4 months |
Answer: Option B
Explanation:
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| 109. |
What percentage of the original radioactive nuclei are left after 5 half-lives? |
Answer: Option C
Explanation:
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| 110. |
The average life of a radioactive atom is Where T + half-life period |
Answer: Option B
Explanation:
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