12th Class Physics MCQS
The total charge of any nucleus is:
Z
Both a and b
Ze
None of above
Controlling rods inserted into the reactor are of metal:
Magnesium
Copper
Cadmium
Aluminium
The early Greeks believed that matter waves was
Continuous
Both continuous and discrete
Discrete
All of above
1 amu is equal to
1.66 x 10-34 kg
1.0606 x 10-27 kg
1.66 x 10-19 kg
1.66 x 10-31 kg
The most abundant isotope of neon is:
Neon 21
Neon 22
Neon 20
None of above
Gamma radiations are emitted due to:
Excitation of nucleus
Excitation of atom
De-excitation of atom
De-excitation of nucleus
Those elements whose charge number z is greater then __________ are unstable:
83
79
80
82
A radio active substance has a half life of four months. 3 -fourth of the substance will decay in:
8 months
6 months
16 months
12 months
The bnding energy for nucleus A is 7.7 Me V and that for nucleus B is 7.8 MeV. Which nucleus has the larger mass?
Nucleus B
Nucleas A
None of these
Less than nucleus
How many neutrons are there in the nuclide Zn66?
36
66
22
30
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