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Class 12 Physics
Atoms
Quiz 1
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For ionization of excited Hydrogen atom, the, required energy is:
0%
a little less than 13.6
0%
equal to 13.6
0%
more than 13.6
0%
3.4 or less
Explanation
3.4 or less
An atom stays in an excited state for about:
0%
10 micro seconds
0%
10 milli seconds
0%
10 nano seconds
0%
10 seconds
Explanation
10 nano seconds
The energy equivalent to one atomic mass unit is :
0%
1.6 × 10
-19
J
0%
6.02 × 10
23
J
0%
9.31 MeV
0%
931 MeV
Explanation
931 MeV
Who explained the splitting of special lines in magnetic field?
0%
Zeeman
0%
Bohr
0%
Summerfield
0%
Einstein
Explanation
Zeeman
The mass of a neutron is:
0%
1.00866 u
0%
1.0866 u
0%
1.866 u
0%
0.1866 u
Explanation
1.00866 u
Isobars have the same:
0%
A
0%
Z
0%
N
0%
All the above
Explanation
A
Isotones have the same:
0%
A
0%
Z
0%
N
0%
All the above
Explanation
N
Half-life of a substance depends on:
0%
pressure
0%
temperature
0%
density
0%
None of these
Explanation
None of these
The concept of electron spin was introduced by:
0%
Becquerel
0%
Goudsmit
0%
Millikan
0%
Uhlenbeek and Goudsmit
Explanation
Uhlenbeek and Goudsmit
The principle that a quantum orbital cannot be occupied by more than two electrons was given by:
0%
Pauli
0%
Millikan
0%
Hund
0%
None of these
Explanation
Pauli
According to Bohr's theory of hydrogen atom, the radius r of stationary orbit are related to principal quantum number n as:
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r
g
∝ \(\frac{1}{n^2}\)
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r
g
∝ \(\frac{1}{n}\)
0%
r
g
∝ n
0%
r
g
∝ n²
Explanation
r
g
∝ n²
F
g
and F
e
represents the gravitational and electrostatic force respectively between two electrons situated at some distance the ratio \(\frac{F_g}{F_e}\) is if the order of:
0%
9.8
0%
10
9
0%
10
42
0%
10
-42
Explanation
10
-42
Artificial radioactivity was discovered by:
0%
Joliot
0%
Becquerel
0%
Pauli
0%
None of these
Explanation
Joliot
P-decay produces:
0%
isobars
0%
isotopes
0%
isotones
0%
All the above
Explanation
isobars
Natural radioactivity was discovered by:
0%
Joliot
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Becquerel
0%
Pauli
0%
None of these
Explanation
Becquerel
Transmutation of nuclei was discovered by:
0%
Rutherford
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Becquerel
0%
Pauli
0%
None of these
Explanation
Rutherford
The energy equivalent to mass defect is called :
0%
binding energy
0%
internal energy
0%
external energy
0%
enthalpy
Explanation
binding energy
The total energy that will be released if a nucleus is built from its constituents is called the:
0%
binding energy of the nucleus
0%
binding energy of the solid
0%
binding energy of the atom
0%
None of these
Explanation
binding energy of the nucleus
The binding energy of \(_{2}^{4}\)He is about:
0%
28.3 eV
0%
28.3 MeV
0%
28.3 J
0%
2.83 MeV
Explanation
28.3 MeV
The binding energy of a deuteron is about:
0%
2.22 MeV
0%
2.22 J
0%
2.22 eV
0%
None of these
Explanation
2.22 MeV
0 h : 0 m : 1 s
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