| 1 |
Radiations present in atmosphere due to the presence of different radioactive elements are: |
Cosmic radiations
Background radiations
secondary radiations
Electromagnetic radiations
|
| 2 |
Which radiations are free of effect of electric and magnetic field? |
Alpha
Beta
Gamma
Alpha and beta
|
| 3 |
Who discovered the phenomenon of natural radioactivity? |
Henry Becurial
Merry Curi
Perry
Rutherford
|
| 4 |
The number of neutrons in the nucleus of tritium is: |
1
2
3
4
|
| 5 |
The symbol of atomic mass number is: |
A
X
N
Z
|
| 6 |
Which particles are nucleons? |
Electrons and protons
Protons and neutrons
Electrons and neutrons
Electrons and positrons
|
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