Modern Physics AFCAT Questions

AFCAT Physics

Modern Physics MCQ Questions


7.
In which phenomenon does light behave like particles?
A.
Interference
B.
Diffraction
C.
Photoelectric effect
D.
Polarization
😑 View Answer Rough Work Error
ANSWER :
C. Photoelectric effect
8.
X-rays were discovered by:
A.
J.J. Thomson
B.
Wilhelm Roentgen
C.
Rutherford
D.
James Clerk Maxwell
😑 View Answer Rough Work Error
ANSWER :
B. Wilhelm Roentgen
9.
The wavelength of visible light ranges between:
A.
100-400 nm
B.
400-700 nm
C.
700-1000 nm
D.
1000-2000 nm
😑 View Answer Rough Work Error
ANSWER :
B. 400-700 nm
10.
What is the function of a moderator in a nuclear reactor?
A.
Slow down neutrons
B.
Absorb neutrons
C.
Increase speed of neutrons
D.
Reflect neutrons
😑 View Answer Rough Work Error
ANSWER :
A. Slow down neutrons
11.
What is the SI unit of radioactivity?
A.
Becquerel
B.
Curie
C.
Gray
D.
Sievert
😑 View Answer Rough Work Error
ANSWER :
A. Becquerel
12.
Who discovered the neutron?
A.
J.J. Thomson
B.
Chadwick
C.
Rutherford
D.
Bohr
😑 View Answer Rough Work Error
ANSWER :
B. Chadwick