Basic Concepts of Chemistry AFCAT Questions

AFCAT Chemistry

Basic Concepts of Chemistry MCQ Questions


1.
Who discovered the electron?
A.
Ernest Rutherford
B.
J.J. Thomson
C.
James Chadwick
D.
Niels Bohr
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ANSWER :
B. J.J. Thomson
2.
The charge-to-mass ratio (e/m) of an electron is approximately:
A.
9.109 × 10^-31 C/kg
B.
1.602 × 10^-19 C/kg
C.
1.758 × 10^11 C/kg
D.
6.022 × 10^23 C/kg
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ANSWER :
C. 1.758 × 10^11 C/kg
3.
Who determined the charge of an electron through the oil drop experiment?
A.
R.A. Millikan
B.
J.J. Thomson
C.
Henri Becquerel
D.
Ernest Rutherford
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ANSWER :
A. R.A. Millikan
4.
The mass of an electron is approximately:
A.
1.672 × 10^-27 kg
B.
1.675 × 10^-27 kg
C.
9.109 × 10^-31 kg
D.
1.602 × 10^-19 kg
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ANSWER :
C. 9.109 × 10^-31 kg
5.
Who discovered the proton?
A.
James Chadwick
B.
Niels Bohr
C.
J.J. Thomson
D.
Ernest Rutherford / E. Goldstein
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ANSWER :
D. Ernest Rutherford / E. Goldstein
6.
Who discovered the neutron?
A.
James Chadwick
B.
Ernest Rutherford
C.
J.J. Thomson
D.
Niels Bohr
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ANSWER :
A. James Chadwick