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Class 12 Physics
Nuclei
Quiz 2
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The isotope generally used for the treatment of cancer is:
0%
I
131
0%
Hg
197
0%
O
15
0%
Co
60
Explanation
Co
60
What percentage of radioactive substance is left after 5 half lives?
0%
3.125%
0%
6.25%
0%
12.33%
0%
31%
Explanation
3.125%
Mass is converted into energy according to the relation:
0%
E = me²
0%
E = mgh
0%
E = \(\frac{3}{2}\)me²
0%
E = \(\frac{mgH}{c^2}\)
Explanation
E = me²
The helium atom does not contain
0%
two protons
0%
two electrons
0%
two neutrons
0%
six nucleons
Explanation
six nucleons
The more readily fissionable isotope of uranium has an atomic mass of:
0%
234
0%
235
0%
236
0%
238
Explanation
235
Energy of electron in the 1st orbit of H-atom is:
0%
-13.6 MeV
0%
-13.6 eV
0%
-13.6 J
0%
13.6 J
Explanation
-13.6 eV
The mass no. of a nucleus is M and its atomic no. is Z. The number of neutrons in the nucleus is :
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M - Z
0%
M
0%
Z
0%
M + Z
Explanation
M - Z
The phenomena of radioactivity is:
0%
Exothermic change with increase or decrease with temperature
0%
increases on applied pressure
0%
nuclear process does not depend on external factors
0%
None of these
Explanation
nuclear process does not depend on external factors
When one gm of mass is converted into energy, it is equal to:
0%
10
3
kWh
0%
10
9
kWh
0%
10
10
kWh
0%
10
11
kWh
Explanation
10
3
kWh
In the given reaction:
\(_{Z}^{A}\)X → \(_{Z+1}^{A}\) Y → \(_{Z-1}^{A-4}\) K → \(_{Z-1}^{A-4}\) K radioactive radiations are emitted in the sequence
0%
α, β, γ
0%
β, α, γ
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γ, α, β
0%
β, γ, α
Explanation
β, α, γ
0 h : 0 m : 1 s
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