An artificial radioactive decay series begins with unstable Pu94241. The stable nuclide obtained after eight α decays and five β-decays is 

(1) Bi83209         

(2) Pb82209

(3) Ti82205         

(4) Hg82201

Subtopic:  Radioactivity (OLD NCERT) |
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The activity of a sample is 64×10-5 Ci. Its half-life is 3 days. The activity will become 5×10-6 Ci after 

(1) 12 days         

(2) 7 days

(3) 18 days         

(4) 21 days

Subtopic:  Radioactivity (OLD NCERT) |
 67%
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The half-life of radon is 3.8 days. Three forth of a radon sample decay in

(1) 5.02 days         

(2) 15.2 days

(3) 7.6 days           

(4) 11.4 days

Subtopic:  Radioactivity (OLD NCERT) |
 83%
From NCERT
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A nucleus of an element X84202 emits an α-particle first, a β-particle next and then a gamma photon. The final nucleus formed has an atomic number 

(1) 200           

(2) 199

(3) 83             

(4) 198

Subtopic:  Types of Decay |
 78%
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Plutonium decays with a half-life of 24000 years. If the plutonium is stored for 72000 years, then the fraction of plutonium that remains is 

(1) 12          

(2) 13
(3) 14          

(4) 18

Subtopic:  Radioactivity (OLD NCERT) |
 82%
From NCERT
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A radioactive substance emits 

(1) α-rays               

(2) β-rays

(3) γ-rays                 

(4) All of these

Subtopic:  Types of Decay |
 91%
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The large scale destruction, that would be caused due to the use of nuclear weapons is called 

(1) Nuclear holocaust

(2) Thermo-nuclear reaction

(3) Nuetron reproduction factor

(4) None of these

Subtopic:  Nuclear Energy |
 51%
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A radioactive substance has a half-life of 1 year. The fraction of this material, that would remain after 5 years will be

(1) 132             

(2) 15
(3) 12               

(4) 45

Subtopic:  Radioactivity (OLD NCERT) |
 87%
From NCERT
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If half-life of a substance is 3.8 days and its quantity is 10.38 gm. Then substance quantity remaining left after 19 days will be 

(1) 0.151 gm             

(2) 0.32 gm

(3) 1.51 gm               

(4) 0.16 gm

Subtopic:  Radioactivity (OLD NCERT) |
 81%
From NCERT
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Which is the correct expression for half-life

(1) t1/2=log2                 

(2) t1/2=λlog2
(3) t1/2=λlog2(2.303)     

(4) t1/2=2.303 log 2λ

Subtopic:  Radioactivity (OLD NCERT) |
 85%
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