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

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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

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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

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Nuclear binding energy
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Fission of nuclei is possible because the binding energy per nucleon in them 
(a) Increases with mass number at high mass numbers
(b) Decreases with mass number at high mass numbers
(c) Increases with mass number at low mass numbers
(d) Decreases with mass number at low mass numbers

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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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The half-life period of radium is 1600 years. Its average life time will be 
(a) 3200 years              (b) 4800 years
(c) 2319 years               (d) 4217 years

Concept Questions :-

Radioactivity
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