MCQOPTIONS
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MCQOPTIONS
This section includes 8 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
When a hydrogen atom is in its first excited level, what is the relation of radius and Bohr radius? |
| A. | Twice |
| B. | 4 times |
| C. | Same |
| D. | Half |
| Answer» C. Same | |
| 2. |
Hydrogen atoms are excited from ground state to the state of principal quantum number 4. Then, what will be the number of spectral lines observed? |
| A. | 3 |
| B. | 6 |
| C. | 5 |
| D. | 2 |
| Answer» E. | |
| 3. |
In terms of Bohr radius a0, the radius of the second Bohr orbit of a hydrogen atom is given by √2 a0. |
| A. | True |
| B. | False |
| Answer» C. | |
| 4. |
Which of the following is true regarding the Bohr model of atoms? |
| A. | Assumes that the angular momentum of electrons is quantized |
| B. | Uses Faraday’s laws |
| C. | Predicts continuous emission spectra for atoms |
| D. | Predicts the same emission spectra for all types of atoms |
| Answer» B. Uses Faraday’s laws | |
| 5. |
A hydrogen atom in its ground state absorbs 10.2 eV of energy. What is the orbital angular momentum is increased by? |
| A. | 4.22 × 10-3 Js |
| B. | 2.11 × 10-34 Js |
| C. | 3.16 × 10-34 Js |
| D. | 1.05 × 10-34 Js |
| Answer» E. | |
| 6. |
What will be the longest wavelength in the Balmer series of hydrogen spectrum? |
| A. | 6557 × 10-10 m |
| B. | 5557 × 10-10 m |
| C. | 9557 × 10-10 m |
| D. | 1557 × 10-10 m |
| Answer» B. 5557 × 10-10 m | |
| 7. |
What is the order of the radius of an electron orbit in a hydrogen atom? |
| A. | 10-8 m |
| B. | 10-9 m |
| C. | 10-11 m |
| D. | 10-13 m |
| Answer» D. 10-13 m | |
| 8. |
The radius of the Bohr orbit depends on which of the following? |
| A. | \(\frac {1}{n }\) |
| B. | n |
| C. | \(\frac {1}{n^2}\) |
| D. | n2 |
| Answer» D. n2 | |