A sample of radioactive element has a mass of 10 gm at an instant t = 0. The approximate mass of this element in the sample after two means lives in [CBSE PMT/PDT 2003]

1. 3.70 gm

2. 6.30 gm

3. 1.35 gm 

4. 2.50 gm

Subtopic:  Radioactivity (OLD NCERT) |
 50%
From NCERT
PMT - 2003
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Given a sample of Radium-226 having half-life of 4 days. Find the probability, a nucleus disintegrates after 2 half lives [IIT-JEE 2006]

1. 1 

2. 1/2 

3. 1.5 

4. 3/4

Subtopic:  Radioactivity (OLD NCERT) |
 71%
From NCERT
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Complete the equation for the following fission process-

U92235+n01Sr3890+........  

1. Xe54143+3 n01 

2. Xe54145

3. Xe57142 

4. Xe54142+n01

Subtopic:  Nuclear Energy |
 76%
From NCERT
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A nucleus ruptures into two nuclear parts which have their velocity ratio equal to 2:1. What will be the ratio of their nuclear size (nuclear radius) ? 

1. 21/3 : 1 

2. 1 : 21/3 

3. 31/2 : 1

4. 1 : 31/2

Subtopic:  Nuclear Binding Energy |
 72%
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The half-life of a radioactive material is 3h. If the initial amount is 300g, then after 18h, it will remain

1. 4.68 g 

2. 46.8 g

3. 9.375 g 

4. 93.75 g

Subtopic:  Radioactivity (OLD NCERT) |
 81%
From NCERT
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Half-life of a radioactive substance is 20 min. Difference between points of time when it is 33% disintegrated and 67% disintegrated is approximately-

1. 10 min

2. 20 min 

3. 30 min

4. 40  min

Subtopic:  Radioactivity (OLD NCERT) |
 72%
From NCERT
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When two deuterium nuclei fuse together to form a tritium nuclei, we get a

1. Neutron

2. Deutron

3. α-particle

4. Proton

Subtopic:  Nuclear Binding Energy |
 52%
From NCERT
PMT - 2000
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The most penetrating radiation out of the following is [1997]

1. γ-rays 

2. α-particles

3. β-rays 

4. X-rays

Subtopic:  Types of Decay |
 80%
From NCERT
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In any fission process the ratio mass of fission productsmass of parent nucleus is         [2005]

1. less than 1

2. greater  than 1

3. equal to 1

4. depends on the mass of parent nucleus

Subtopic:  Nuclear Binding Energy |
 64%
From NCERT
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The nucleus C48d115, after two successive β-decay will give [1988]

1. P46a115   

2. I49n114

3. S50n113   

4. S50n115

Subtopic:  Types of Decay |
 78%
From NCERT
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