Explore topic-wise MCQs in Wireless Mobile Communications.

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
Discussion
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
Discussion
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.
Discussion
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.
Discussion
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
Discussion
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
Discussion
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
Discussion
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.
Discussion
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.
Discussion
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
Discussion
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
Discussion
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
Discussion
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
Discussion
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
Discussion
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.
Discussion
16.

Which bond has a fluctuating charge?

A. Dispersion
B. Dipole
C. Ionic
D. Covalent
Answer» B. Dipole
Discussion
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
Discussion
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
Discussion
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.
Discussion
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¢
Discussion
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
Discussion
22.

What is the relative neutron scattering power of iron?

A. 1.8
B. 5.4
C. 7.7
D. 11.4
Answer» E.
Discussion
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¢
Discussion
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
Discussion
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>
Discussion
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.
Discussion
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
Discussion
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
Discussion
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.
Discussion
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.
Discussion
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.
Discussion
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
Discussion
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
Discussion
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.
Discussion
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
Discussion
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
Discussion