Solar energy is mainly caused due to [2003]

1. fusion of protons during synthesis of heavier elements

2. gravitational contraction

3. burning of hydrogen in the oxygen

4. fission of uranium present in the sun

Subtopic:  Mass-Energy Equivalent |
 83%
From NCERT
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A sample of radioactive elements contains 4×1010 active nuclei. If half-life of element is 10 days, then the number of decayed nuclei after 30 days is 

1. 0.5×1010   

2. 2×1010

3. 3.5×1010

4. 1×1010

Subtopic:  Radioactivity (OLD NCERT) |
 53%
From NCERT
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A and B are two radioactive substances whose half-lives are 1 and 2 years respectively. Initially 10 g of A and 1 g of B is taken. The time (approximate) after which they will have the same quantity remaining is:

1. 6.62 yr

2. 5 yr   

3. 3.2 yr 

4. 7 yr

Subtopic:  Radioactivity (OLD NCERT) |
 58%
From NCERT
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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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