MCQOPTIONS
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MCQOPTIONS
This section includes 36 Mcqs, each offering curated multiple-choice questions to sharpen your Wireless Mobile Communications knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The condition for the constructive of an optical grating is that ______________ |
| A. | The lines are perpendicular to each other |
| B. | The lines are parallel each other |
| C. | The lines intersect each other |
| D. | The lines crosses each other |
| Answer» C. The lines intersect each other | |
| 2. |
In the optical grating system if α>>λ, for the constructive interference which of the following phenomenon takes place? |
| A. | Refraction of light |
| B. | Deflection continuum |
| C. | Diffraction continuum |
| D. | Refraction continuum |
| Answer» D. Refraction continuum | |
| 3. |
Diffraction refers to the phenomenon that occurs when _________ encounters an obstacle or a slit. |
| A. | Liquid particles |
| B. | Gaseous particles |
| C. | Electric field |
| D. | Waves |
| Answer» E. | |
| 4. |
For predicting the field strength in a given service area, it is essential to estimate ______ |
| A. | Polarization |
| B. | Magnetic field |
| C. | Height of transmitter |
| D. | Signal attenuation |
| Answer» E. | |
| 5. |
In mobile communication system, diffraction loss occurs due to ______ |
| A. | Dielectric medium |
| B. | Obstruction |
| C. | Electric field |
| D. | Operating frequency |
| Answer» C. Electric field | |
| 6. |
At high frequencies, diffraction does not depends on ___________ |
| A. | Geometry of the object |
| B. | Distance between Tx and Rx |
| C. | Amplitude of incident wave |
| D. | Polarization of incident wave |
| Answer» C. Amplitude of incident wave | |
| 7. |
Diffraction occurs when radio path between Tx. And Rx. Is obstructed by ____________ |
| A. | Surface having sharp irregularities |
| B. | Smooth irregularities |
| C. | Rough surface |
| D. | All types of surfaces |
| Answer» B. Smooth irregularities | |
| 8. |
Which state of metal does this figure depict? |
| A. | Coarse grains > 0.04 mm |
| B. | Fine grains 0.004 mm |
| C. | Very fine grains 0.0004 mm |
| D. | Distorted crystal |
| Answer» E. | |
| 9. |
When are irregular spots in the Laue method formed? |
| A. | Coarse grains > 0.04 mm |
| B. | Fine grains 0.004 mm |
| C. | Very fine grains 0.0004 mm |
| D. | Cold worked |
| Answer» E. | |
| 10. |
What is the resultant image formed for very fine grains in the Laue back reflection method? |
| A. | Few clear spots |
| B. | Large number of spots |
| C. | Continuous rings |
| D. | Irregular spots |
| Answer» D. Irregular spots | |
| 11. |
In which case can the rotating crystal method for determining crystal structure be used? |
| A. | Single crystal |
| B. | Polycrystalline |
| C. | Fine-grained polycrystalline |
| D. | Cold worked crystals |
| Answer» C. Fine-grained polycrystalline | |
| 12. |
IN_THE_OPTICAL_GRATING_SYSTEM_IF_‚ÂÀ√≠¬¨¬±>>‚ÂÀ√≠¬¨‚Ñ¢,_FOR_THE_CONSTRUCTIVE_INTERFERENCE_WHICH_OF_THE_FOLLOWING_PHENOMENON_TAKES_PLACE??$# |
| A. | Refraction of light |
| B. | Deflection continuum |
| C. | Diffraction continuum |
| D. | Refraction continuum |
| Answer» D. Refraction continuum | |
| 13. |
IN_MOBILE_COMMUNICATION_SYSTEM,_DIFFRACTION_LOSS_OCCURS_DUE_TO_______?$ |
| A. | Dielectric medium |
| B. | Obstruction |
| C. | Electric field |
| D. | Operating frequency |
| Answer» C. Electric field | |
| 14. |
The_condition_for_the_constructive_of_an_optical_grating_is_that_______________$ |
| A. | The lines are perpendicular to each other |
| B. | The lines are parallel each other |
| C. | The lines intersect each other |
| D. | The lines crosses each other |
| Answer» C. The lines intersect each other | |
| 15. |
For_predicting_the_field_strength_in_a_given_service_area,_it_is_essential_to_estimate_______$ |
| A. | Polarization |
| B. | Magnetic field |
| C. | Height of transmitter |
| D. | Signal attenuation |
| Answer» E. | |
| 16. |
Which bond has a fluctuating charge? |
| A. | Dispersion |
| B. | Dipole |
| C. | Ionic |
| D. | Covalent |
| Answer» B. Dipole | |
| 17. |
For the first order diffraction in the optical grating which of the following condition is required for the constructive interference? |
| A. | Sinα=1 |
| B. | Sinα=2 |
| C. | Sinα<1 |
| D. | Sinα>1 |
| Answer» D. Sin‚âà√≠¬¨¬±>1 | |
| 18. |
Which of the following explains the concept of diffraction loss? |
| A. | Principle of Simultaneity |
| B. | Pascal’s Principle |
| C. | Fresnel zone |
| D. | Archimedes’ Principle |
| Answer» D. Archimedes‚Äö√Ñ√∂‚àö√ë‚àö¬• Principle | |
| 19. |
What is the relative X-ray scattering power of iron and cobalt? |
| A. | 1 and 1 |
| B. | 4 and 6 |
| C. | 12 and 13 |
| D. | 26 and 27 |
| Answer» E. | |
| 20. |
What is the condition for the first order diffracted beam, in the optical grating? |
| A. | a tanα=λ |
| B. | a sinα=2λ |
| C. | a sinα=λ |
| D. | a sinα=3λ |
| Answer» D. a sin‚âà√≠¬¨¬±=3‚âà√≠¬¨‚Ñ¢ | |
| 21. |
The phase difference between a direct line of sight path and diffracted path is function of _______ |
| A. | Height and position of obstruction |
| B. | Only height |
| C. | Operating frequency |
| D. | Polarization |
| Answer» B. Only height | |
| 22. |
What is the relative neutron scattering power of iron? |
| A. | 1.8 |
| B. | 5.4 |
| C. | 7.7 |
| D. | 11.4 |
| Answer» E. | |
| 23. |
Which of the following equation is used for the constructive interference in optical grating? |
| A. | a tanα=nλ |
| B. | a cotα=nλ |
| C. | a sinα=nλ |
| D. | a secα=nλ |
| Answer» D. a sec‚âà√≠¬¨¬±=n‚âà√≠¬¨‚Ñ¢ | |
| 24. |
Difference between the direct path and the diffracted path is called _______ |
| A. | Average length |
| B. | Radio path length |
| C. | Excess path length |
| D. | Wavelength |
| Answer» D. Wavelength | |
| 25. |
The intensity of the initial neutron in neutron diffraction is reduced by a factor of ________ |
| A. | 10<sup>2</sup> |
| B. | 10<sup>3</sup> |
| C. | 10<sup>5</sup> |
| D. | 10<sup>7</sup> |
| Answer» C. 10<sup>5</sup> | |
| 26. |
Which of the following phenomenon occur when the waves originate from each line source in the optical grating? |
| A. | Magnetic flux |
| B. | Reflection |
| C. | Refraction |
| D. | Interference |
| Answer» E. | |
| 27. |
Diffraction is caused by propagation of secondary wavelets into _______ |
| A. | Bright region |
| B. | Shadowed region |
| C. | Smooth region |
| D. | Large region |
| Answer» C. Smooth region | |
| 28. |
Lines on the glass in optical grating act as________ |
| A. | Electrodes |
| B. | Concentration factor |
| C. | Secondary source of light |
| D. | Primary source of light |
| Answer» D. Primary source of light | |
| 29. |
Which principle explains the phenomenon of diffraction? |
| A. | Principle of Simultaneity |
| B. | Pascal’s Principle |
| C. | Archimedes’ Principle |
| D. | Huygen’s principle |
| Answer» E. | |
| 30. |
When are irregular spots in Laue method formed? |
| A. | Coarse grains > 0.04 mm |
| B. | Fine grains 0.004 mm |
| C. | Very fine grains 0.0004 mm |
| D. | Cold worked |
| Answer» E. | |
| 31. |
In optical grating, what is the range of the separation of the lines? |
| A. | 10 AÀö |
| B. | 100 AÀö |
| C. | 10000 AÀö |
| D. | Greater than 10000 AÀö |
| Answer» E. | |
| 32. |
Diffraction allows radio signals to propagate around ________ |
| A. | Continuous surface |
| B. | Smooth surface |
| C. | Curved surface of Earth |
| D. | Does not allow propagation |
| Answer» D. Does not allow propagation | |
| 33. |
What is the resultant image formed for very fine grains in Laue back reflection method? |
| A. | Few clear spots |
| B. | Large number of spots |
| C. | Continuous rings |
| D. | Irregular spots |
| Answer» D. Irregular spots | |
| 34. |
Which of the following statement is true for the optical grating? |
| A. | It gives 1 dimensional analogue of the 2 dimensional process |
| B. | It gives 2 dimensional analogue of the 3 dimensional process |
| C. | It gives 3 dimensional analogue of the 1 dimensional process |
| D. | It gives 1 dimensional analogue of the 3 directional process |
| Answer» E. | |
| 35. |
At high frequencies, diffraction does not depends on ______ |
| A. | Geometry of the object |
| B. | Distance between Tx and Rx |
| C. | Amplitude of incident wave |
| D. | Polarization of incident wave |
| Answer» C. Amplitude of incident wave | |
| 36. |
Diffraction occurs when radio path between Tx. And Rx. Is obstructed by ________ |
| A. | Surface having sharp irregularities. |
| B. | Smooth irregularities |
| C. | Rough surface |
| D. | All types of surfaces |
| Answer» B. Smooth irregularities | |