Basic Concepts of Chemistry AFCAT Questions

AFCAT Chemistry

Basic Concepts of Chemistry MCQ Questions


13.
According to Einstein, when a _____ of sufficient energy strikes an electron in the atom of the metal, it transfers its energy instantaneously to the electron during the collision and the electron is ejected without any time lag or delay
A.
Tritium
B.
Photon
C.
Neutron
D.
Electron
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ANSWER :
B. Photon
14.
Hydrogen atom consisting of only one proton is called _____
A.
Chlorine
B.
Tritium
C.
Deuterium
D.
Protium
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ANSWER :
D. Protium
15.
Atoms, molecules or ions that have absorbed radiation are said to be _____
A.
Detached
B.
Attached
C.
Excited
D.
Released
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ANSWER :
C. Excited
16.
The negative sign means that the energy of the electron in the hydrogen atom is _____ than the energy of a free electron at rest.
A.
Higher
B.
Lower
C.
Forward
D.
Backward
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ANSWER :
B. Lower
17.
_____ model of the hydrogen atom, therefore, not only ignores dual behaviour of matter but also contradicts Heisenberg uncertainty principle
A.
Boyle
B.
Chadwick
C.
Thomson
D.
Bohr
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ANSWER :
D. Bohr
18.
The hydrogen atom containing 1 proton and 1 neutron is called _____
A.
Deuterium
B.
Protium
C.
Tritium
D.
Nitrogen
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ANSWER :
A. Deuterium