MCQOPTIONS
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MCQOPTIONS
This section includes 37 Mcqs, each offering curated multiple-choice questions to sharpen your Optical Communication knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Solids do not have which type of polarisation? |
| A. | Ionic |
| B. | Orientational |
| C. | Interfacial |
| D. | Electronic |
| Answer» D. Electronic | |
| 2. |
What does the following graph show? |
| A. | Linearly Polarized Light |
| B. | Unpolarized Light |
| C. | Partially Polarized Light |
| D. | Circular Polarized Light |
| Answer» B. Unpolarized Light | |
| 3. |
A plate which induces the desired amount of phase difference between two rays is known as ___________ |
| A. | Polaroid |
| B. | Phasor plates |
| C. | Retardation Plates |
| D. | Quartz plates |
| Answer» D. Quartz plates | |
| 4. |
Unpolarized light is incident on a plane glass surface. What should be the angle of incidence such that the reflect and refracted rays are perpendicular to each other? |
| A. | 90° |
| B. | 45° |
| C. | 57° |
| D. | 60° |
| Answer» D. 60° | |
| 5. |
A tube of length 20cm containing a 10% sugar solution rotates the plane of polarization by 13.2°. What is the specific rotation of sugar solution? |
| A. | 66° |
| B. | 55 |
| C. | 44 |
| D. | 33 |
| Answer» B. 55 | |
| 6. |
What should be the thickness of quarter-wave plate for a light of wavelength 5890 Å if µe = 1.553 and µo = 1.544? |
| A. | 1.33 X 10-3 cm |
| B. | 1.43 X 10-3 cm |
| C. | 1.53 X 10-3 cm |
| D. | 1.63 X 10-3 cm |
| Answer» E. | |
| 7. |
An electromagnetic beam has an intensity 28 W/m2 and is linearly polarized vertically. What is the intensity of the transmitted beam, if the angle of incidence on the polaroid is 45o with the vertical? |
| A. | 10 Wm-1 |
| B. | 12 Wm-1 |
| C. | 14 Wm-1 |
| D. | 16 Wm-1 |
| Answer» D. 16 Wm-1 | |
| 8. |
The velocity of light in water is 2.2 X 108 m/s. What is the polarizing angle of incidence? |
| A. | 47.23 |
| B. | 51.02 |
| C. | 53.74 |
| D. | 65.36 |
| Answer» D. 65.36 | |
| 9. |
If the phase difference between two rays is π/2 and the angle of incidence is not equal to π/4, the emergent light is __________ |
| A. | Linearly Polarized |
| B. | Elliptically Polarized |
| C. | Circularly Polarized |
| D. | Non-Polarized |
| Answer» C. Circularly Polarized | |
| 10. |
Which of the following is a uniaxial crystal? |
| A. | Borax |
| B. | Mica |
| C. | Quartz |
| D. | Selenite |
| Answer» D. Selenite | |
| 11. |
Sound waves can be polarized. |
| A. | True |
| B. | False |
| Answer» C. | |
| 12. |
What should be the phase difference between the two plane-polarized waves, vibrating at right angles to each other, to produce circularly polarized light? |
| A. | π/6 |
| B. | π/2 |
| C. | π/4 |
| D. | π/3 |
| Answer» C. π/4 | |
| 13. |
A window which can transmit all the incident light without any reflection is called ___________ |
| A. | Polarized Window |
| B. | Malus Window |
| C. | Brewster Window |
| D. | Non-reflecting window |
| Answer» D. Non-reflecting window | |
| 14. |
When two components are equally excited at the fiber input, then for polarization maintaining fibers δΓg should be around ___________ |
| A. | 1.5ns/km |
| B. | 1 ns/km |
| C. | 1.2ns/km |
| D. | 2ns/km |
| Answer» C. 1.2ns/km | |
| 15. |
A polarization maintaining fiber operates at a wavelength 1.2μm and have a modal birefringence of 1.8*10-3. Calculate the period of perturbation. |
| A. | 0.7 seconds |
| B. | 0.6 seconds |
| C. | 0.23 seconds |
| D. | 0.5 seconds |
| Answer» C. 0.23 seconds | |
| 16. |
Beat length of a single mode optical fiber is 0.6cm. Calculate the difference between propagation constants for the orthogonal modes. |
| A. | 69.8 |
| B. | 99.86 |
| C. | 73.2 |
| D. | 104.66 |
| Answer» E. | |
| 17. |
The beat length in a single mode optical fiber is 8 cm when light from a laser with a peak wavelength 0.6μm is launched into it. Estimate the modal birefringence. |
| A. | 1×10-5 |
| B. | 3.5×10-5 |
| C. | 2×10-5 |
| D. | 4×10-5 |
| Answer» B. 3.5×10-5 | |
| 18. |
An optical fiber behaves as a birefringence medium due to differences in ___________ |
| A. | Effective R-I and core geometry |
| B. | Core-cladding symmetry |
| C. | Transmission/propagation time of waves |
| D. | Refractive indices of glass and silica |
| Answer» B. Core-cladding symmetry | |
| 19. |
The optical source used for detection of optical signal is ____________ |
| A. | IR sensors |
| B. | Photodiodes |
| C. | Zener diodes |
| D. | Transistors |
| Answer» C. Zener diodes | |
| 20. |
For many applications that involve optical fiber transmission, an intensity modulation optical source is not required. |
| A. | True |
| B. | False |
| Answer» C. | |
| 21. |
IN_THE_GIVEN_TYPES_OF_POLARISATION,_WHICH_TYPE_EXISTS_IN_THE_SEMICONDUCTOR??$ |
| A. | Electronic |
| B. | Ionic |
| C. | Orientational |
| D. | Interfacial or space charge |
| Answer» E. | |
| 22. |
Solids_do_not_have_which_type_of_polarisation?$ |
| A. | Ionic |
| B. | Orientational |
| C. | Interfacial |
| D. | Electronic |
| Answer» D. Electronic | |
| 23. |
The total polarisation of a material is th? |
| A. | Product of all types of polarisation |
| B. | Sum of all types of polarisation |
| C. | Orientation directions of the dipoles |
| D. | Total dipole moments in the material |
| Answer» C. Orientation directions of the dipoles | |
| 24. |
Polarization modal noise can _________ the performance of communication system? |
| A. | Degrade |
| B. | Improve |
| C. | Reduce |
| D. | Attenuate |
| Answer» B. Improve | |
| 25. |
In isotropic materials, which of the following quantities will be independent of the direction? |
| A. | Permittivity |
| B. | Permeability |
| C. | Polarisation |
| D. | Polarizability |
| Answer» B. Permeability | |
| 26. |
When two components are equally excited at the fiber input, then for polarization maintaining fibers δΓgshould be around$ |
| A. | 1.5ns/km |
| B. | 1 ns/km |
| C. | 1.2ns/km |
| D. | 2ns/km |
| Answer» C. 1.2ns/km | |
| 27. |
Calculate the polarisation vector in air when the susceptibility is 5 and electric field is 12 units. |
| A. | 3 |
| B. | 2 |
| C. | 60 |
| D. | 2.4 |
| Answer» D. 2.4 | |
| 28. |
A polarization maintaining fiber operates at a wavelength 1.2μm and have a modal birefringence of 1.8*10-3. Calculate the period of perturbation.$ |
| A. | 0.7 seconds |
| B. | 0.6 seconds |
| C. | 0.23 seconds |
| D. | 0.5 seconds |
| Answer» C. 0.23 seconds | |
| 29. |
Identify which type of polarisation depends on temperature. |
| A. | Electronic |
| B. | Ionic |
| C. | Orientational |
| D. | Interfacial |
| Answer» D. Interfacial | |
| 30. |
Beat length of a single mode optical fiber is 0.6cm. Calculate the difference between propagation constants for the orthogonal modes |
| A. | 69.8 |
| B. | 99.86 |
| C. | 73.2 |
| D. | 104.66 |
| Answer» E. | |
| 31. |
Calculate the energy stored per unit volume in a dielectric medium due to polarisation when P = 9 units and E = 8 units. |
| A. | 1.77 |
| B. | 2.25 |
| C. | 36 |
| D. | 144 |
| Answer» D. 144 | |
| 32. |
The beat length in a single mode optical fiber is 8 cm, when light from a laser with a peak wavelength 0.6μm is launched into it. Estimate the modal birefringence.$ |
| A. | 1√ó10<sup>-5</sup> |
| B. | 3.5√ó10<sup>-5</sup> |
| C. | 2√ó10<sup>-5</sup> |
| D. | 4√ó10<sup>-5</sup> |
| Answer» B. 3.5‚Äö√†√∂‚àö‚â•10<sup>-5</sup> | |
| 33. |
Polarizability is defined as the |
| A. | Product of dipole moment and electric field |
| B. | Ratio of dipole moment to electric field |
| C. | Ratio of electric field to dipole moment |
| D. | Product of dielectric constant and dipole moment |
| Answer» C. Ratio of electric field to dipole moment | |
| 34. |
An optical fiber behaves as a birefringence medium due to differences in |
| A. | Effective R-I and core geometry |
| B. | Core-cladding symmetry |
| C. | Transmission/propagation time of waves |
| D. | Refractive indices of glass and silica |
| Answer» B. Core-cladding symmetry | |
| 35. |
Calculate the polarisation vector of the material which has 100 dipoles per unit volume in a volume of 2 units. |
| A. | 200 |
| B. | 50 |
| C. | 400 |
| D. | 0.02 |
| Answer» B. 50 | |
| 36. |
The optical source used for detection of optical signal is |
| A. | IR sensors |
| B. | Photodiodes |
| C. | Zener diodes |
| D. | Transistors |
| Answer» C. Zener diodes | |
| 37. |
For many applications which involve optical fiber transmission, an intensity modulation optical source is not required. State whether the given statement is true or false. |
| A. | True |
| B. | False |
| Answer» C. | |