MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What is the energy required to ionize an H-atom from the third excited state, if ground state ionization energy of H-atom is 13.6 eV? |
| A. | 1.5 eV |
| B. | 3.4 eV |
| C. | 13.6 eV |
| D. | 12.1 eV |
| Answer» B. 3.4 eV | |
| 2. |
Find out the minimum energy required to take out the only one electron from the ground state of Li+? |
| A. | 13.6 eV |
| B. | 122.4 eV |
| C. | 25.3 eV |
| D. | 67.9 eV |
| Answer» C. 25.3 eV | |
| 3. |
The energy of characteristic X-ray is a consequence of which of the following? |
| A. | The energy of the projectile electron |
| B. | The thermal energy of the target |
| C. | Transition in target atoms |
| D. | Temperature |
| Answer» D. Temperature | |
| 4. |
What is the ratio of minimum to maximum wavelength in the Balmer series? |
| A. | 5:9 |
| B. | 5:36 |
| C. | 1:4 |
| D. | 3:4 |
| Answer» B. 5:36 | |
| 5. |
The Bohr model of atoms uses Einstein’s photoelectric equation. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
Calculate the ratio of the kinetic energy for the n = 2 electron for the Li atom to that of Be+ ion? |
| A. | \(\frac {9}{16}\) |
| B. | \(\frac {3}{4}\) |
| C. | 1 |
| D. | \(\frac {1}{2}\) |
| Answer» B. \(\frac {3}{4}\) | |
| 7. |
The size of the atom is proportional to which of the following? |
| A. | A |
| B. | A1/3 |
| C. | A2/3 |
| D. | A-1/3 |
| Answer» C. A2/3 | |
| 8. |
According to the uncertainty principle for an electron, time measurement will become uncertain if which of the following is measured with high certainty? |
| A. | Energy |
| B. | Momentum |
| C. | Location |
| D. | Velocity |
| Answer» B. Momentum | |
| 9. |
Which source is associated with a line emission spectrum? |
| A. | Electric fire |
| B. | Neon street sign |
| C. | Red traffic light |
| D. | Sun |
| Answer» C. Red traffic light | |