Basic CS [3i Infotech Placement]: Sample Questions 110 - 111 of 243

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Question 110

Basic CS
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Describe in Detail

Essay▾

In the transport layer, TCP is what type of protocol

Explanation

TCP is a reliable protocol while UDP is not.

Given TCP/UDP Header in Transport Layer

Two main transport layer protocols are used on the Internet:

TCP:

  • Transport layer establishes communication session between two applications- receives data from the application, breaks it into segments, and sends them over network
  • It is a reliable protocol that provides extensive error and flow control to ensure the successful delivery of data.

UDP:

  • User datagram protocol removes all the error-checking from TCP.
  • Packets are just sent to the recipient.
  • Error correction and flow control is responsibility of the application layer.

Question 111

Question

MCQ▾

Which of the following is not an essential condition for interference?

Choices

Choice (4)

a.

The two interfering waves must be propagated in almost the same direction or the two interfering waves must intersect at a very small angle

b.

Amplitude of the two waves should be the same

c.

The waves must have the same time period and wavelength

d.

The interfering beams of light must originate from the same source

Answer

b.

Explanation

  • The phase difference between the two waves should not change with time.
    • If the phase difference between the waves, changes with time, the intensity at a given point will be a function of time and fringe pattern will not be clean.
    • The phase difference between the waves can be maintained by using coherent light sources or by using waves derived from one single source.
  • The two waves must also have same state of polarization i.e.. their electric field vectors must point in the same direction
    • If the electric field vectors of two waves point in orthogonal direction the resultant intensity will not depend upon the phase difference.
    • If the electric field vectors of these waves are not completely orthogonal, the components which are parallel to each other will interfere.
    • In this case the difference between maximum and minimum intensity will not be as large as in the case when two waves are in the same state of polarization.
  • The two interfering waves should have same wavelength.
    • If the wavelengths are very different, the interference cannot take place.
    • In the case when there is slight variation in wavelength, the resultant wave behaves like a group of waves and result in beat formation.

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