CBSE Class 12 Physics Nuclei Quiz 2

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1. Radius of 1st Bohr orbit is a₀ (= 0.529 Å) What is the radius of 2nd Bohr orbit?

A 10^-8 B 2a₀ C 4a₀ D 2√2a₀

2. The ground state energy of Hydrogen atom is -6 eV. What is the potential energy of electron in this state?

A 0 eV B -13.6 eV C 2 eV D -27.2 eV

3. Which of the following atoms has the lowest ionization potential?

A \(_{8}^{8}\)O B \(_{7}^{14}\)N C \(_{55}^{133}\)Cs D \(_{18}^{40}\)Ar

4. The Bohr model of atom:

A assumes that the angular momentum of electron is quantized B uses Einstein's photoelectric equation C predicts continuous emission spectra for atoms D predicts the same emission spectra for all types of atoms

5. Nuclear force is:

A strong, short range and charge independent force B charge independent, attractive and long range force C strong, charge dependent and short range attractive force D long range, change dependent and attractive force

6. If radio active nuclei emits β-particle, then mass-number:

A increased by 1 unit B decreases by 1 unit C increases by 2 unit D decreases by 2 unit

7. An alpha particle is emitted from \(_{88}\)Ra\(^{226}\), then the product nuclei has:

A Z = 84, A = 224 B Z = 86, A = 224 C Z = 86, A = 222 D Z = 82, A = 222

8. X-ray was discovered by :

A Becqueral B Marie curie C Roengton D Vanlaw

9. Fusion takes place at high temperature because:

A Atom are ionised at high temperature B Molecules break up at high temperature C Nuclei break up at high temp. D Kinetic energy is high enough to overcome repulsion between nuclei

10. The order of nuclear density is :

A 10³ B 10¹⁷ C 10⁶ D None

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