Modern Physics AFCAT Questions

AFCAT Physics

Modern Physics MCQ Questions


13.
The phenomenon of emission of electrons due to heat is called:
A.
Thermionic emission
B.
Photoelectric emission
C.
Field emission
D.
Secondary emission
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ANSWER :
A. Thermionic emission
14.
Which of these particles is NOT affected by an electric field?
A.
Electron
B.
Proton
C.
Neutron
D.
Alpha particle
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ANSWER :
C. Neutron
15.
What is the typical half-life of Carbon-14?
A.
5,730 years
B.
1,000 years
C.
10,000 years
D.
573 years
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ANSWER :
A. 5,730 years
16.
The device used to measure radioactivity is called:
A.
Galvanometer
B.
Geiger-Muller Counter
C.
Mass spectrometer
D.
Cyclotron
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ANSWER :
B. Geiger-Muller Counter
17.
The term "quantum" was first introduced in relation to:
A.
Energy levels
B.
Light
C.
Photons
D.
Planck's radiation law
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ANSWER :
D. Planck's radiation law
18.
The wave nature of electrons was proved by:
A.
Photoelectric effect
B.
Compton effect
C.
Davisson and Germer experiment
D.
X-ray diffraction
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ANSWER :
C. Davisson and Germer experiment