12th Class Physics MCQS
The mass spectrum of naturally occurring neon, showing
2 isotope
3 isotope
1 isotope
4 isotope
Low level radiations effects
Less of hair
All
Ulceration
Drop of white blood cells
One joule of energy absorbed per kilogram of a body is
Curie
Rem
Grey
Roentgen
Nuclear fission was discovered by:
Friz strassmann
Michaelson
Otto Hahn
Both a and b
Radioactivity happen due to the disintegration of
Mass
Nucleus
Protons
Electrons
The energy equivalent of 1 kg of matter is about:
10-17J
10-15 J
1 J
10-12J
Unit of decay constant
ms
m
S-1
m-1
Both xenon and caesium each have:
43 isotopes
33 isotopes
36 isotopes
41 isotopes
The energy of photon for photoelectric effect is less than
8 MeV
2 MeV
1 MeV
5 MeV
The first atomic reactor was introduced by
Newton
Enrico Fermi
Currie
Bohr
Binding energy per nucleus for uranium is above:
6.7 Mev
6.9 MeV
7.9 MeV
7.7 Mev