Solar energy is mainly caused due to 

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 |
 82%
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) |
 54%
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 

1. 3.70 gm

2. 6.30 gm

3. 1.35 gm 

4. 2.50 gm

Subtopic:  Radioactivity (OLD NCERT) |
 51%
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 

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 |
 75%
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 |
 71%
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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) |
 80%
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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