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Q. No.\(\mathrm{O}_2\) molecule consists of two oxygen atoms. In the molecule, nuclear force between the nuclei of the two atoms:
| 1. | is not important because nuclear forces are short-ranged |
| 2. | is as important as electrostatic force for binding the two atoms |
| 3. | cancels the repulsive electrostatic force between the nuclei |
| 4. | is not important because oxygen nucleus have equal number of neutrons and protons |
Subtopic: Â Nuclear Binding Energy |
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Level 3: 35%-60%
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The gravitational force between \(\text H\text-\)atom and another particle of mass \(m\) will be given by Newton's law \(F=\dfrac{GMm}{r^2},\) where \(r\) is in \(\text{km}\) and;
| 1. | \(M = m_{\text{proton}}+ m_{\text{electron}}.\) |
| 2. | \(M = m_{\text{proton}}+ m_{\text{electron}}-\frac{B}{c^2}\left(B= 13.6~\text{eV}\right)\). |
| 3. | \(M\) is not related to the mass of the hydrogen atom. |
| 4. | \(M = m_{\text{proton}}+ m_{\text{electron}}-\frac{|V|}{c^2}(|V|=\) magnitude of the potential energy of electron in the \(\text H\text-\)atom). |
Subtopic: Â Nuclear Binding Energy |
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Level 2: 60%+
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\(M_x\) and \(M_y\) denote the atomic masses of the parent and the daughter nuclei respectively in radioactive decay. The \(Q\text -\)value for a \(\beta^{-}\) decay is \(Q_1\) and that for a \(\beta^{+}\) decay is \(Q_2.\) If \(m_e\) denotes the mass of an electron, then which of the following statements is correct?
| 1. | \(\small[Q_1=\left(M_x-M_y\right) c^2 \text { and } Q_2=\left[M_x-M_y-2 m_e\right] c^2 \) |
| 2. | \( \small[Q_1=\left(M_x-M_y\right) c^2 \text { and } Q_2=\left(M_x-M_y\right) c^2 \) |
| 3. | \(\small[Q_1=\left(M_x-M_y-2 m_e\right)c^2 \text { and } Q_2=\left(M_x-M_y+2 m_e\right) c^2 \) |
| 4. | \(\small[Q_1=\left(M_x-M_y+2 m_e\right) c^2 \text { and } Q_2=\left(M_x-M_y+2 m_e\right) c^4 \) |
Subtopic: Â Nuclear Binding Energy |
 51%
Level 3: 35%-60%
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Heavy stable nucle have more neutrons than protons. This is because of the fact that
1. neutrons are heavier than protons.
2. electrostatic force between protons are repulsive.
3. neutrons decay into protons through beta decay.
4. nuclear forces between neutrons are weaker than that between protons.
1. neutrons are heavier than protons.
2. electrostatic force between protons are repulsive.
3. neutrons decay into protons through beta decay.
4. nuclear forces between neutrons are weaker than that between protons.
Subtopic: Â Nuclear Binding Energy |
 57%
Level 3: 35%-60%
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