Radioactivity was discovered by

(1) Becquerel           

(2) Pierre Curie

(3) Roentgen             

(4) Rutherford

Subtopic:  Radioactivity (OLD NCERT) |
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The average life T and the decay constant λ of a radioactive nucleus are related as 

(1) =1               

(2) T=0.693λ

(3) Tλ=1               

(4) T=cλ

Subtopic:  Radioactivity (OLD NCERT) |
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If T is the half life of a radioactive material, then the fraction that would remain after a time T2 is 
(1) 12             

(2) 34
(3) 12           

(4) 2-12

Subtopic:  Radioactivity (OLD NCERT) |
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Which of the following is in the increasing order for penetrating power 

(1) α,β,γ               

(2) β,α,γ

(3) γ,α,β               

(4) γ,β,α

Subtopic:  Types of Decay |
 70%
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The half life of a radioactive element which has only 132 of its original mass left after a lapse of 60 days is

(1) 12 days                 

(2) 32 days

(3) 60 days                 

(4) 64 days

Subtopic:  Radioactivity (OLD NCERT) |
 88%
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The half-life of Bi210 is 5 days. What time is taken by (7/8)th part of the sample to decay 

(1) 3.4 days               

(2) 10 days

(3) 15 days               

(4) 20 days

Subtopic:  Radioactivity (OLD NCERT) |
 85%
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Radioactivity is

(1) Irreversible process             

(2) Self disintegration process

(3) Spontaneous process           

(4) All of the above

Subtopic:  Radioactivity (OLD NCERT) |
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Half life of radioactive element depends upon

(1) Amount of element present 

(2) Temperature

(3) Pressure

(4) Nature of element

Subtopic:  Radioactivity (OLD NCERT) |
 68%
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The decay constant of radium is 4.28×10-4 per year. Its half life will be 

(1) 2000 years       

(2) 1240 years

(3) 63 years           

(4) 1620 years

Subtopic:  Types of Decay |
 74%
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Which of the following is not a mode of radioactive decay

(1) Positron emission           

(2) Electron capture

(3) Fusion                         

(4) Alpha decay

Subtopic:  Radioactivity (OLD NCERT) |
 61%
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