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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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A nucleus AZA emits an α-particle. The resultant nucleus emits a β+ particle. The respective atomic and mass no. of the final nucleus will be 

1. Z – 3, A – 4           

2. Z – 1, A – 4

3. Z – 2, A – 4           

4. Z, A – 2

Subtopic:  Types of Decay |
 70%
From NCERT
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The activity of a radioactive sample is 1.6 curie and its half-life is 2.5 days. Its activity after 10 days will be

(1) 0.8 curie       

(2) 0.4 curie

(3) 0.1 curie       

(4) 0.16 curie

Subtopic:  Radioactivity (OLD NCERT) |
 79%
From NCERT
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In a mean life of a radioactive sample 

(1) About 1/3 of substance disintegrates

(2) About 2/3 of the substance disintegrates

(3) About 90% of the substance disintegrates

(4) Almost all the substance disintegrates

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