MCQOPTIONS
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MCQOPTIONS
This section includes 10 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 will be the number of photons emitted per second, if the power of the radio transmitter is 15 kW and it operates at a frequency of 700 kHz? |
| A. | 3.24 × 1031 |
| B. | 3.87 × 1025 |
| C. | 2.77 × 1037 |
| D. | 3.24 × 1045 |
| Answer» B. 3.87 × 1025 | |
| 2. |
Which among the following shows the particle nature of light? |
| A. | Photoelectric effect |
| B. | Interference |
| C. | Refraction |
| D. | Polarization |
| Answer» B. Interference | |
| 3. |
What is the momentum of a photon of wavelength λ? |
| A. | \(\frac {hv}{c}\) |
| B. | Zero |
| C. | \(\frac {h\lambda }{c^2}\) |
| D. | \(\frac {h\lambda }{c}\) |
| Answer» B. Zero | |
| 4. |
What is the energy of a photon of wavelength λ? |
| A. | hcλ |
| B. | \(\frac {hc}{\lambda }\) |
| C. | \(\frac {\lambda }{hc}\) |
| D. | \(\frac {\lambda h}{c}\) |
| Answer» C. \(\frac {\lambda }{hc}\) | |
| 5. |
When a proton is accelerated through 1 V, then its kinetic energy will be 1 V. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
Photons of energy 10.25 eV fall on the surface of the metal emitting photoelectrons of maximum kinetic energy 5.0 eV. What is the stopping voltage required for these electrons? |
| A. | 10 V |
| B. | 4 V |
| C. | 8 V |
| D. | 5 V |
| Answer» E. | |
| 7. |
What will be the photon energy for a wavelength of 5000 angstroms, if the energy of a photon corresponding to a wavelength of 7000 angstroms is 4.23 × 10-19 J? |
| A. | 0.456 eV |
| B. | 5.879 eV |
| C. | 3.701 eV |
| D. | 1.6 × 10-19 eV |
| Answer» D. 1.6 × 10-19 eV | |
| 8. |
Among the following four spectral regions, in which of them, the photon has the highest energy in? |
| A. | Infrared |
| B. | Violet |
| C. | Red |
| D. | Blue |
| Answer» C. Red | |
| 9. |
Calculate the energy of a photon of wavelength 6600 angstroms. |
| A. | 0.3 × 10-19 J |
| B. | 3 × 10-19 J |
| C. | 30 × 10-19 J |
| D. | 300 × 10-19 J |
| Answer» C. 30 × 10-19 J | |
| 10. |
What is the frequency of a photon whose energy is 66.3 eV? |
| A. | 12.6 × 1016 Hz |
| B. | 91.6 × 1016 Hz |
| C. | 1.6 × 1016 Hz |
| D. | 81.6 × 1016 Hz |
| Answer» D. 81.6 × 1016 Hz | |