The energy equivalent of \(0.5\) g of a substance is:
1. \(4.5\times10^{13}\) J
2. \(1.5\times10^{13}\) J
3. \(0.5\times10^{13}\) J
4. \(4.5\times10^{16}\) J

Subtopic:  Mass-Energy Equivalent |
 61%
From NCERT
NEET - 2020
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When a uranium isotope \(_{92}^{235}\mathrm{U}\) is bombarded with a neutron, it generates \(_{36}^{89}\mathrm{Kr}\), three neutrons and: 
1. \(_{40}^{91}\mathrm{Zr}\)
2. \(_{36}^{101}\mathrm{Kr}\)
3. \(_{36}^{103}\mathrm{Kr}\)
4. \(_{56}^{144}\mathrm{Ba}\)

Subtopic:  Nuclear Energy |
 85%
From NCERT
NEET - 2020
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Two stable isotopes of lithium \(^{6}_{3}\mathrm{Li}\) and \(^{7}_{3}\mathrm{Li}\) have respective abundances of \(7.5\%\) and \(92.5\%\). These isotopes have masses \(6.01512~\text{u}\) and \(7.01600~\text{u}\), respectively. The atomic mass of lithium is:
1. \(6.940934~\text{u}\)
2. \(6.897643~\text{u}\)
3. \(7.863052~\text{u}\)
4. \(7.167077~\text{u}\)

Subtopic:  Nuclear Binding Energy |
 67%
From NCERT
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The three stable isotopes of neon: N1020e, N1021e, and N1022e have respective abundances of 90.51%, 0.27%, and 9.22%. The atomic masses of the three isotopes are 19.99 u, 20.99 u, and 21.99 u, respectively. The average atomic mass of neon is:

1. 20.1709 u
2. 21.7037 u
3. 20.1771 u
4. 21.0097 u

Subtopic:  Nuclear Binding Energy |
 58%
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What is the binding energy (in MeV) of a nitrogen nucleus N714?

Given, 
mp = 1.007825 u
mn = 1.008665 u
m(N714) = 14.003074 u

1. 102.7 MeV.
2. 100.7 MeV.
3. 104.7 MeV.
4. 108.7 MeV.

Subtopic:  Nuclear Binding Energy |
 55%
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A radioactive isotope has a half-life of years. How long will it take the activity to reduce to 3.125% of its original value?

1. T years.
2. 4T years.
3. 3T years.
4. 5T years.

Subtopic:  Radioactivity (OLD NCERT) |
 64%
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What is the amount of C2760o necessary to provide a radioactive source of 8.0 mCi strength? The half-life of C2760o is 5.3 years.

1. 8.109×10-6 g
2. 7.106×10-6 g 
3. 7.105×10-5 g

4. 8.107×10-5 g

Subtopic:  Radioactivity (OLD NCERT) |
 58%
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A given coin has a mass of 3.0 g. How much nuclear energy would be required to separate all the neutrons and protons from each other? For simplicity assume that the coin is entirely made of C2963u atoms (of mass 62.92960 u).

Mass of proton, mp = 1.00783 u
Mass of neutron, mn = 1.00867 u


1. \(2.5296\times10^{12}\) MeV
2. \(1.581\times10^{25}\)  MeV
3. \(3.1223\times10^{20}\) MeV
4. \(931.02\times10^{19}\) MeV

Subtopic:  Nuclear Binding Energy |
 52%
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The amount of C2760o necessary to provide a radioactive source of 8.0 mCi strength is:

(The half-life of C2760o is 5.3 years)

1.  
\(6.3\times10^{-6}\) g
2. \(7.1\times10^{-6}\) g
3. \(5.7\times10^{-6}\) g
4. \(6.9\times10^{-6}\) g

Subtopic:  Radioactivity (OLD NCERT) |
 68%
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The half-life of S3890r is 28 years. What is the disintegration rate of 15 mg of this isotope?
1. \(9.64 \times 10^{10}~\mathrm{atoms} / \mathrm{s}\)
2. \(11.12 \times 10^{11}~\mathrm{atoms} / \mathrm{s}\)
3. \(7.87 \times 10^{10}~\mathrm{atoms}/ \mathrm{s}\)
4. \(10.04 \times 10^{11}~\mathrm{atoms}/ \mathrm{s}\)

Subtopic:  Radioactivity (OLD NCERT) |
 51%
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