A nucleus is bombarded with a high speed neutron so that resulting nucleus is a radioactive one. This phenomenon is called 
(a) Artificial radioactivity          (b) Fusion
(c) Fission                               (d) Radioactivity

Concept Questions :-

Radioactivity
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Which of the following cannot cause fission in a heavy nucleus 
(a) α-particle          (b) Proton
(c) Deutron             (d) Laser rays

Concept Questions :-

Radioactivity
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 If the mass number of an atom is A = 40 and its electron configuration is 1s22s22p63s23p6, the number of neutrons and protons in its nucleus will be 
(a) 22, 18            (b) 18, 22
(c) 20, 20            (d) 18, 18

Concept Questions :-

Mass-energy equivalent
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Which of the following is most unstable
(a) Electrons           (b) Protons
(c) Neutrons           (d) α-particle

Concept Questions :-

Radioactivity
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The nuclei of which one of the following pairs of nuclei are isotones 
(a) Se3474, Ca3171           (b) Mo4292, Zr4092
(c) Sr3881, Sr3886             (d) Ca2040, S1632

Concept Questions :-

Nuclear binding energy
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Fission of nuclei is possible because the binding energy per nucleon in them 
1. Increases with mass number at high mass numbers
2. Decreases with mass number at high mass numbers
3. Increases with mass number at low mass numbers
4. Decreases with mass number at low mass numbers

Concept Questions :-

Nuclear reactor
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 Radioactive substance do not emit

(a) Electron           (b) Helium nucleus
(c) Positron           (d) Proton

Concept Questions :-

Radioactivity
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During a negative beta decay 
(a) An atomic electron is ejected
(b) An electron which is already present within the nucleus is ejected
(c) A neutron in the nucleus decays emitting an electron
(d) A part of the binding energy is converted into electron

Concept Questions :-

Types of decay
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Some radioactive nucleus may emit
(a) Only one α,β or γ at a time
(b) All the three α,β and γ one after another
(c) All the three α,β and γ simultaneously
(d) Only α and β simultaneously

Concept Questions :-

Types of decay
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Which can pass through 20 cm thickness of the steel

(a) α particles                   (b) β particles
(c) γ rays                         (d) Ultraviolet rays

Concept Questions :-

Types of decay
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