Structure of Atoms NDA Questions

NDA Chemistry

Structure of Atoms MCQ Questions


7.
The mass of a proton is approximately how many times the mass of an electron?
A.
100 times
B.
10 times
C.
2000 times
D.
Equal to the mass of an electron
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ANSWER :
C. 2000 times
8.
The neutron was discovered by James Chadwick in which year?
A.
1932
B.
1911
C.
1886
D.
1897
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ANSWER :
A. 1932
9.
James Chadwick discovered the neutron by bombarding a thin sheet of which element with alpha particles?
A.
Carbon
B.
Beryllium
C.
Gold
D.
Hydrogen
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ANSWER :
B. Beryllium
10.
What is the charge carried by a neutron?
A.
No charge (neutral)
B.
+2 units
C.
-1 unit
D.
+1 unit
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ANSWER :
A. No charge (neutral)
11.
Among the three fundamental particles of an atom, which one has a mass nearly equal to that of a proton?
A.
Positron
B.
Electron
C.
Photon
D.
Neutron
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ANSWER :
D. Neutron
12.
J.J. Thomson's model of the atom is popularly known as which of the following?
A.
Planetary model
B.
Cloud model
C.
Watermelon model (Plum pudding model)
D.
Nuclear model
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ANSWER :
C. Watermelon model (Plum pudding model)