Modern Physics AFCAT Questions

AFCAT Physics

Modern Physics MCQ Questions


13.
The maximum number of electrons in n-th shell is given by:
A.
n²/2
B.
n²
C.
2n²
D.
2n+1
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ANSWER :
C. 2n²
14.
Which experiment demonstrated the existence of the atomic nucleus?
A.
Cathode ray experiment
B.
Photoelectric experiment
C.
Millikan's oil drop experiment
D.
Rutherford's alpha scattering experiment
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ANSWER :
D. Rutherford's alpha scattering experiment
15.
In Rutherford's gold foil experiment, most alpha particles:
A.
Passed straight through the foil
B.
Were deflected at small angles
C.
Were absorbed
D.
Bounced back
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ANSWER :
A. Passed straight through the foil
16.
The energy of an electron in the n-th orbit of hydrogen atom is given by:
A.
-13.6/n eV
B.
-13.6/n² eV
C.
+13.6/n² eV
D.
-13.6 × n² eV
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ANSWER :
B. -13.6/n² eV
17.
The radius of the first Bohr orbit of hydrogen atom is:
A.
1.06 Å
B.
5.29 Å
C.
0.265 Å
D.
0.529 Å
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ANSWER :
D. 0.529 Å
18.
The ground state energy of hydrogen atom is:
A.
-3.4 eV
B.
-1.51 eV
C.
-13.6 eV
D.
+13.6 eV
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ANSWER :
C. -13.6 eV