Engineering :: Nuclear Engineering
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61. |
Elements have different nuclear charge but the same mass number are called |
A. |
isotones |
B. |
isobars |
C. |
isotopes |
D. |
isosteres |
Answer: Option B
Explanation:
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62. |
The elements A and B which are isobaric have atomic number 18 and 20 respectively. If B contains 20 neutrons the number of neutrons in A is |
Answer: Option D
Explanation:
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63. |
The increasing order (lowest first) for the values of e/m (charge/mass) for electron (e) proton (p) neutron (n) and alpha particle (a) is |
A. |
e p n a |
B. |
n p e a |
C. |
n p a e |
D. |
n a p e |
Answer: Option D
Explanation:
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64. |
An element zMA undergoes an ?-emission followed by two successive ?-emissions. The element formed is |
Answer: Option B
Explanation:
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65. |
The radioactive isotope of hydrogen is called |
A. |
protium |
B. |
deuterium |
C. |
tritium |
D. |
ortho-hydrogen |
Answer: Option C
Explanation:
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66. |
Unit negative charge and negligible mass are the characteristics of |
A. |
electrons |
B. |
protons |
C. |
neutrons |
D. |
mesons |
Answer: Option A
Explanation:
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67. |
One amu is equal to |
A. |
1.66 x 10-24 kg |
B. |
1.66 x 10-21 kg |
C. |
1.66 x 10-27 kg |
D. |
1.66 x 10-26 kg |
Answer: Option C
Explanation:
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68. |
Which one of the following elements is not radioactive? |
A. |
Radium |
B. |
Zirconium |
C. |
Uranium |
D. |
Polonium |
Answer: Option B
Explanation:
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69. |
One amu is equivalent to |
A. |
931 J |
B. |
931 eV |
C. |
931 MeV |
D. |
9.31 MeV |
Answer: Option C
Explanation:
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70. |
When a radioactive element emits an ?-particle it becomes |
A. |
electrically negative |
B. |
electrically positive |
C. |
neutral |
D. |
none of the above |
Answer: Option A
Explanation:
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