# 12th Class Physics MCQS Chapter 10

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The scientist who suggested the presence of neutron was:
J.J Thomson
Rutherford
Bohr

I amu =
9.31 MeV
None of above
931 MeV
9.031 MeV

The SI unit of decay constant is
Nm-1
m
S-1
m-1

Unit of decay constant
m
S-1
m-1
ms

Before and after nuclear reaction the number of protons and neutrons:
Remains same
Must be increased
Must be decreased
Must be different

Mass equivalent of 931 MeV energy is:
1.766 x 10-27kg
2.67 x 10-29kg
6.02 x 10-87kg
6.02 x 10-23 kg

In Wilson cloud chamber, if tracks are thick, straight and continuous, then particle is
a-particles
ß-particles
Y-rays
All

Rutherford performed on experiment on a nuclear reaction in:
1921
1981
1927
1932

Bottom quark carries charge :
+1/3 e
-1 /3 e
2/3 e
-2/3 e

The binding energy for_________ is maximum.
Iron
Copper
Aluminum
Glass

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