Two radioactive material X1 and X2 have decay constants 5λ and λ respectively. If initially they have the same number of nuclei of X1to that of X2 will be 1eafter a time 

1. λ                                     

2. 12λ

3. 14λ                                 

4. eλ

Subtopic:  Radioactivity (OLD NCERT) |
 80%
From NCERT
NEET - 2008
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One nanogram of matter converted into energy will give- 

1. 90 J                     

2. 9×103 J 

3. 9×1010 J            

4. 9×104 J

Subtopic:  Nuclear Binding Energy |
From NCERT
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Fast neutrons can easily be slowed down by 

1. The use of lead shielding

2. Passing them through heavy water

3. Elastic collisions with heavy nuclei

4. Applying a strong electric field

Subtopic:  Nuclear Energy |
 73%
From NCERT
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The number of neutrons released when U23592 undergoes fission by absorbing n01 and Ba56144+Kr3689are formed, is 

1. 0           

2. 1

3. 2           

4. 3

Subtopic:  Mass-Energy Equivalent |
 63%
From NCERT
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The binding energy of nucleus is a measure of its

1. Charge             

2. Mass

3. Momentum       

4. Stability

Subtopic:  Nuclear Binding Energy |
 74%
From NCERT
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Heavy water is 

1. Water at 4°C

2. Compound of deuterium and oxygen

3. Compound of heavy oxygen and heavy hydrogen

4. Water in which soap does not lather

Subtopic:  Nuclear Energy |
 83%
From NCERT
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Which of the following pairs of nuclei are isotones?
1. \({}_{34}^{74}\mathrm{Se}, {}_{31}^{71}\mathrm{Ca}\) 2. \({}_{42}^{92}\mathrm{Mo}, {}_{40}^{92}\mathrm{Zr}\)
3. \({}_{38}^{81}\mathrm{Sr}, {}_{38}^{86}\mathrm{Sr}\) 4. \({}_{20}^{40}\mathrm{Ca}, {}_{16}^{32}\mathrm{S}\)
Subtopic:  Nuclear Binding Energy |
 85%
From NCERT
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The decay constant of radium is 4.28×10-4 per year. Its half life will be 

1. 2000 years       

2. 1240 years

3. 63 years           

4. 1620 years

Subtopic:  Types of Decay |
 75%
From NCERT
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Binding energy per nucleon plot against the mass number for stable nuclei is shown in the figure. Which curve is correct ?

1. A
2. B
3. C
4. D

Subtopic:  Nuclear Binding Energy |
 68%
From NCERT
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The binding energy per nucleon in deuterium and helium nuclei are 1.1 MeV and 7.0 MeV, respectively. When two deuterium nuclei fuse to form a helium nucleus the energy released in the fusion is 

1. 23.6 MeV                                         

2. 2.2 MeV

3. 28.0 MeV                                         

4. 30.2 MeV

Subtopic:  Nuclear Binding Energy |
 89%
From NCERT
NEET - 2010
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