Modern Physics AFCAT Questions

AFCAT Physics

Modern Physics MCQ Questions


1.
Who proposed the plum pudding model of the atom?
A.
Niels Bohr
B.
Ernest Rutherford
C.
John Dalton
D.
J.J. Thomson
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ANSWER :
D. J.J. Thomson
2.
The discovery of the nucleus is credited to:
A.
Niels Bohr
B.
James Chadwick
C.
Ernest Rutherford
D.
J.J. Thomson
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ANSWER :
C. Ernest Rutherford
3.
Who discovered the neutron?
A.
Ernest Rutherford
B.
Henry Moseley
C.
J.J. Thomson
D.
James Chadwick
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ANSWER :
D. James Chadwick
4.
The charge on an electron is approximately:
A.
-1.6 × 10⁻¹⁸ C
B.
-9.1 × 10⁻³¹ C
C.
-1.6 × 10⁻¹⁹ C
D.
-1.67 × 10⁻²⁷ C
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ANSWER :
C. -1.6 × 10⁻¹⁹ C
5.
The mass of a proton is approximately:
A.
9.1 × 10⁻³¹ kg
B.
1.67 × 10⁻²⁴ kg
C.
1.6 × 10⁻¹⁹ kg
D.
1.67 × 10⁻²⁷ kg
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ANSWER :
D. 1.67 × 10⁻²⁷ kg
6.
Atomic number of an element represents:
A.
Number of neutrons
B.
Number of electrons in outermost shell
C.
Number of nucleons
D.
Number of protons
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ANSWER :
D. Number of protons