If 20 gm of a radioactive substance due to radioactive decay reduces to 10 gm in 4 minutes, then in what time 80 gm of the same substance will reduce to 10 gm 

(1) In 8 minutes             

(2) In 12 minutes

(3) In 16 minutes             

(4) In 20 minutes

Subtopic:  Radioactivity (OLD NCERT) |
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16 gm sample of a radioactive element is taken from Bombay to Delhi in 2 hour and it was found that 1 gm of the element remained (undisintegrated). Half life of the element is 

(1) 2 hour         

(2) 1 hour

(3) 12 hour         

(4) 14hour

Subtopic:  Radioactivity (OLD NCERT) |
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Unit of radioactivity is Rutherford. Its value is

(1) 3.7×1010 disintegrations/sec

(2) 3.7×106 disintegrations/sec

(3) 1.0×1010disintegrations/sec

(4) 1.0×106 disintegrations/sec

Subtopic:  Radioactivity (OLD NCERT) |
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A radioactive substance has a half life of 60 minutes. After 3 hours, the fraction of atom that have decayed would be

(1) 12.5%               

(2) 87.5%

(3) 8.5%                 

(4) 25.1%

Subtopic:  Radioactivity (OLD NCERT) |
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An element used for radioactive carbon dating for more than 5600 years is 

(1) C-14         

(2) U-234

(3) U-238       

(4) Po-94

Subtopic:  Radioactivity (OLD NCERT) |
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N atoms of a radioactive element emit n alpha particles per second. The half life of the element is

(1) nN sec                   

(2) Nn sec

(3) 0.693 Nn sec           

(4)  0.693 nN sec

Subtopic:  Radioactivity (OLD NCERT) |
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The radioactive nucleus N713 decays to C613 through the emission of 

(1) Neutron             

(2) Proton

(3) Electron             

(4) Positron

Subtopic:  Radioactivity (OLD NCERT) |
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The radioactive decay of uranium into thorium is expressed by the equation U92238Th90234+X where 'X' is

(1) An electron               

(2) A proton

(3) A deuteron                 

(4) An alpha particle

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In a radioactive decay, neither the atomic number nor the mass number changes. Which of the following would be emitted in the decay process 

(1) Proton             

(2) Neutron

(3) Electron           

(4) Photon

Subtopic:  Radioactivity (OLD NCERT) |
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The half life period of a radioactive substance is 5 min. The amount of substance decayed in 20 min will be

(1) 93.75%                 

(2) 75%

(3) 25%                       

(4) 6.25%

Subtopic:  Radioactivity (OLD NCERT) |
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