NCERT Class 12/MCQ Questions for Class 12 Physics Chapter 12 Atoms Sample Test,Sample questions

Question:
An atom stays in an excited state for about:

1.10 micro seconds

2.10 milli seconds

3.10 nano seconds

4.10 seconds


Question:
Artificial radioactivity was discovered by:

1.Joliot

2.Becquerel

3.Pauli

4.None of the above


Question:
For ionization of excited Hydrogen atom, the, required energy is:

1.a little less than 13.6

2. equal to 13.6

3.more than 13.6

4.3.4 or less


Question:
Half-life of a substance depends on:

1.pressure

2.temperature

3.density

4.None of the these


Question:
Isobars have the same:

1.A

2.Z

3.N

4.All the above


Question:
Isotones have the same:

1.A

2.Z

3.Neutron

4.All the above


Question:
Natural radioactivity was discovered by:

1.Joliot

2.Becquerel

3.Pauli

4.None of the above


Question:
P-decay produces:

1.isobars

2.isotopes

3.isotones

4.All the above


Question:
The binding energy of 42He is about:

1.28.3 eV

2.28.3 MeV

3.28.3 J

4.2.83 MeV


Question:
The binding energy of a deuteron is about:

1.2.22 MeV

2. 2.22 J

3.2.22 eV

4.None of the these


Question:
The concept of electron spin was introduced by:

1.Becquerel

2.Goudsmit

3.Millikan

4.Uhlenbeek and Goudsmit


Question:
The energy equivalent to mass defect is called :

1.binding energy

2.internal energy

3.external energy

4.enthalpy


Question:
The energy equivalent to one atomic mass unit is :

1. 1.6 × 10-19 J

2.6.02 × 1023 J

3.9.31 MeV

4.931 MeV


Question:
The mass of a neutron is:

1.1.00866 u

2.1.0866 u

3.1.866 u

4.0.1866 u


Question:
The principle that a quantum orbital cannot be occupied by more than two electrons was given by:

1.Pauli

2.Millikan

3.Hund

4.None of the above


Question:
The total energy that will be released if a nucleus is built from its constituents is called the:

1.binding energy of the nucleus

2.binding energy of the solid

3.binding energy of the atom

4.None of the above


Question:
Transmutation of nuclei was discovered by:

1.Rutherford

2.Becquerel

3.Pauli

4.None of the above


Question:
Who explained the splitting of special lines in magnetic field?

1.Zeeman

2.Bohr

3.Summerfield

4.Einstein


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