Modern Physics AFCAT Questions

AFCAT Physics

Modern Physics MCQ Questions


7.
Mass number of an atom is the sum of:
A.
Neutrons and electrons
B.
Protons and electrons
C.
Protons and neutrons
D.
Only protons
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ANSWER :
C. Protons and neutrons
8.
Isotopes of an element have:
A.
Same mass number, different atomic numbers
B.
Same number of neutrons
C.
Same atomic number, different mass numbers
D.
Different atomic and mass numbers
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ANSWER :
C. Same atomic number, different mass numbers
9.
Isobars are atoms with:
A.
Same mass number but different atomic numbers
B.
Same number of neutrons
C.
Same atomic number but different mass numbers
D.
Same chemical properties
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ANSWER :
A. Same mass number but different atomic numbers
10.
Isotones are nuclei having:
A.
Same mass number
B.
Same atomic number
C.
Same number of neutrons
D.
Same number of protons
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ANSWER :
C. Same number of neutrons
11.
Bohr's atomic model is based on:
A.
Heisenberg's uncertainty principle
B.
Wave nature of electrons
C.
Pauli's exclusion principle
D.
Quantization of angular momentum
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ANSWER :
D. Quantization of angular momentum
12.
The maximum number of electrons in the L-shell is:
A.
32
B.
18
C.
2
D.
8
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ANSWER :
D. 8