MCQOPTIONS
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MCQOPTIONS
This section includes 11 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
At what condition, vp = vg? |
| A. | dv<sub>p</sub>/dk = 0 |
| B. | dv<sub>p</sub>/d = 0 |
| C. | dv<sub>p</sub>/d = 0 |
| D. | dv<sub>p</sub>/d = 0 |
| Answer» D. dv<sub>p</sub>/d = 0 | |
| 2. |
Energy of a wave divided by its momentum gives _____________ |
| A. | Group velocity |
| B. | Classical Velocity |
| C. | Phase Velocity |
| D. | Wave velocity |
| Answer» E. | |
| 3. |
The uncertainty in the location of a particle moving with velocity 7.28 X 107m /s is two times its de-Broglie wavelength. What is the uncertainty in measuring the velocity? |
| A. | 5.79 X 10<sup>6</sup> m/s |
| B. | 6.12 X 10<sup>6</sup> m/s |
| C. | 7.63 X 10<sup>6</sup> m/s |
| D. | 8.45 X 10<sup>6</sup> m/s |
| Answer» B. 6.12 X 10<sup>6</sup> m/s | |
| 4. |
must be normalizable. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5. |
There is an inextensible string of linear density . If it is given that = (k sqrt{ frac{T}{ }} ), then what is the group velocity of the string? |
| A. | ( sqrt{ frac{T}{ }} ) |
| B. | ( sqrt{ frac{T}{ }} ) |
| C. | ( frac{ hbar}{2} sqrt{ frac{T}{ }} ) |
| D. | ( frac{1}{ hbar} sqrt{ frac{T}{ }} ) |
| Answer» B. ( sqrt{ frac{T}{ }} ) | |
| 6. |
The motion of a wave packet is similar to _____________ |
| A. | Photons |
| B. | Waves |
| C. | Classical Particle |
| D. | Quantum Particle |
| Answer» D. Quantum Particle | |
| 7. |
Which of the following is the correct relation between the group velocity and the phase velocity? |
| A. | v<sub>g</sub> = v<sub>p</sub> + dv<sub>p</sub>/d |
| B. | v<sub>p</sub> = v<sub>g</sub> + dv<sub>p</sub>/d |
| C. | v<sub>p</sub> = v<sub>g</sub> dv<sub>p</sub>/d |
| D. | v<sub>g</sub> = v<sub>p</sub> dv<sub>p</sub>/d |
| Answer» E. | |
| 8. |
Which of the following is the correct expression for the group velocity? |
| A. | |
| B. | d /d |
| C. | dE/dk |
| D. | dE/ dk |
| Answer» E. | |
| 9. |
Waves in the wave packets are such that they interfere constructively over a large region of space. |
| A. | True |
| B. | False |
| Answer» C. | |
| 10. |
The energy of elastic waves is given by _____________ |
| A. | n |
| B. | n |
| C. | n /2 |
| D. | (n + <sup>1</sup> <sub>2</sub>) |
| Answer» E. | |
| 11. |
Elastic waves in crystals are made up of _______________ |
| A. | Photons |
| B. | Nano particles |
| C. | Atoms |
| D. | Phonons |
| Answer» E. | |