What percentage of original radioactive atoms is left after five half lives 

(1) 0.3%               

(2) 1%

(3) 31%                 

(4) 3.125%

Subtopic:  Radioactivity (OLD NCERT) |
 79%
From NCERT
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Beta rays emitted by a radioactive material are

(1) Electromagnetic radiation

(2) The electrons orbiting around the nucleus

(3) Charged particles emitted by nucleus

(4) Neutral particles

Subtopic:  Types of Decay |
 66%
From NCERT
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Alpha rays emitted from a radioactive substance are

(1) Negatively charged particles

(2) Ionised hydrogen nuclei

(3) Doubly ionised helium atom

(4) Uncharged particles having the mass equal to proton

Subtopic:  Types of Decay |
 89%
From NCERT
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Half life of Bi210 is 5 days. If we start with 50,000
atoms of this isotope, the number of atoms left over after 10
days is 

(1) 5,000               

(2) 25,000

(3) 12,500             

(4) 20,000

Subtopic:  Radioactivity (OLD NCERT) |
 78%
From NCERT
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A nucleus of atomic mass A and atomic number Z emits β-particles. The atomic mass and atomic number of the resulting nucleus are 

(1) A, Z             

(2) A + 1, Z

(3) A, Z + 1       

(4) A-4, Z-2 

Subtopic:  Types of Decay |
 84%
From NCERT
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Radioactivity was discovered by

(1) Becquerel           

(2) Pierre Curie

(3) Roentgen             

(4) Rutherford

Subtopic:  Radioactivity (OLD NCERT) |
 69%
From 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) |
 62%
From 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) |
 64%
From 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%
From NCERT
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