The half-life period of a radioactive isotope is 24 days. It would be 75% decomposed in
A.12 days
B.24 days
C.36 days
D.40 days
Category: Nuclear Engineering Mcqs
A proton is identical with
A.ionised hydrogen molecule
B.the nucleus of hydrogen atom
C.the nucleus of deuterium
D.an ?-ray particle
The positron is almost as heavy as
A.an electron
B.a proton
C.a neutron
D.a meson
In an ?-decay the ratio of neutron to proton
A.decreases
B.increases
C.remains unchanged
D.may decrease or increase
Maximum density of heavy water is at
A.0?C
B.4?C
C.11.6?C
D.3.8?C
Gamma rays are
A.high energy electrons
B.high energy electromagnetic waves
C.low energy electrons
D.low energy electromagnetic waves
Two grams of radioactive substance is reduced to 0.25 gm during a period of 60 days. The half-life period is
A.10 days
B.15 days
C.20 days
D.30 days
The number of protons in the nucleus 92U235 is
A.327
B.92
C.235
D.143
Unit negative charge and negligible mass are the characteristics of
A.electrons
B.protons
C.neutrons
D.mesons
The mass number of an element is 40 and atomic number 20. The ratio of neutrons to protons is
A.1:10
B.1:20
C.2:10
D.none of the above
