Bissoy.com
Doctors Medicines MCQs Q&A

In an optical fibre, the pulse dispersion effect is minimized by 1. Using a high frequency light source 2. Using plastic cladding 3. Minimizing the core diameter Which of the above statements is/are correct?

In an optical fibre, the pulse dispersion effect is minimized by 1. Using a high frequency light source 2. Using plastic cladding 3. Minimizing the core diameter Which of the above statements is/are correct? Correct Answer 3 only 

Pulse dispersion effect in optical fiber when a light signal is a travel along the fiber axis the width of pulse gets stretched and overlap with neighboring pulse due to variation of refractive index. This leads to pulse dispersion in fiber and effect is called pulse dispersion.

[ alt="F2 Shubham 21-9-2020 Swati D 10" src="//storage.googleapis.com/tb-img/production/20/09/F2_Shubham_21-9-2020_Swati_D%2010.png" style="width: 547px; height: 319px;">

In an optical fiber, the pulse dispersion effects are minimized by:

  • Using monochromatic light sources such as LASER.
  • Reducing the diameter of the core fiber.
  • Using graded-index fiber rather than step-index fiber.
  • Using low refractive index material for cladding.

Related Questions

Focusing on plastic pollution, the June issue of the National Geographic magazine created quite a buzz on social media, contrary to expectations after the cover featured a plastic bag submerged in an ocean with a ’Planet or Plastic?’ text on it. Ironically, the magazine itself was wrapped in a double layer of plastic. Which of the following options can be the reason for the magazine to go viral on the internet as inferred from the statements? I. It highlighted the amount of single-use plastic that enters in the world’s oceans which is a major environmental concern these days. II. National Geographic kicked off its ‘Planet or Plastic’ campaign, the magazine’s multiyear effort to raise awareness about the global plastic trash crisis through the cover. III. The magazine about ocean plastic pollution came wrapped in a plastic bag inside another plastic bag. IV. Because they realized the major flaw and announced that the magazine will no longer be shipped to readers in a plastic bag but will be sent out in a paper envelope instead.
Consider the following statements.
1. Fibre optics is based on the principle of total internal reflection.
2. In an optical fibre communication system, power consumption is extremely low
3. Optical fibre communications are free from radio frequency interference.
4. In India, Reliance Group of Industries is engaged in the manufacture of the optical fibre.
Which of these statements are correct?
The 2018 Nobel Prize in Physics has been awarded in laser physics for the optical tweezers and their applications to biological systems for the method of generating high-intensity, ultra-short optical pulses. Which of the following verifies the given statement? I:  The 2018 Nobel Prize in Physics has been awarded in laser physics for the optical tweezers. II: The 2018 Nobel Prize in Physics has been awarded for applications of the optical tweezers to biological systems. III: The 2018 Nobel Prize in Physics has been awarded for the method of generating high-intensity, ultra-short optical pulses using the optical tweezers.
Low quality of jute fibre is attributed to
1. Discoloration of fibre
2. Very short fibre strands
3. Reduction of cellulose in fibre
4. Reduction of cell wall strength over-retting decreases the fibre quality due to
Select the correct answer:
In the following question, the first and the last part of the sentence/passage are numbered 1 and 6. The rest of the sentence/passage is split into four parts and named P, Q, R, S. These four parts are not given in their proper order. Read the sentence/passage and find out which of the four combinations is correct. S1. Plastic bags are a major cause of environmental pollution. P. Many countries around the globe have either ban the plastic bag or Levi tax on it. Q. Plastic as a substance is non-biodegradable and thus plastic bags remain in the environment for hundreds of years polluting it immensely. R. However, the problem hasn’t been solved completely because the implementation of these measures hasn’t been as successful. S. It has become very essential to ban plastic bags before they ruin our planet completely. S6. Research shows that waste plastic bags have been a major reason for untimely animal deaths.
Which among the following methods will ensure proper use of getting rid of plastic waste? A. Burning Plastic waste.  B. Reusing it by throwing garbage in it.  C. Minimizing use of plastic.  D. Reusing plastic bags for carrying non -food items. 
Availability of drinking water is continuously decreasing. The government decided to identify those sources of drinking water which getting polluted. The following table depicts the number of polluted sources in a district. Source of drinking water getting polluted Number Wells 24 Handpump 12 Dam 12 Borewell 6 Ponds 18 The pictograph table for the above table will be (A) Source of drinking water getting polluted Number symbol = 6 source Wells Handpump Dam Borewell Ponds (B) Source of drinking water getting polluted Number symbol  = 6 source Wells Handpump Dam Borewell Ponds (C) Source of drinking water getting polluted Number symbol  = 6 source Wells Handpump Dam Borewell Ponds (D) Source of drinking water getting polluted Number symbol  = 6 source Wells Handpump Dam Borewell Ponds
Read the given passage and answer the question that follows. Plastic is extremely harmful for the earth and the environment. Plastic that we use eventually ends up in landfills and it takes hundreds of years to biodegrade. This plastic stays on the earth and pollutes land and oceans. There is a dire need to eliminate the use of plastic and to reduce and recycle the plastic that already exists in the landfills. Which of the following argument could be made from the above passage?
With reference to Fibre-reinforced plastic, consider the following statement: 1. It is a composite material made of a polymer matrix reinforced with fibres. 2. Bakelite was the first fibre-reinforced plastic. Which of the statements given above is/are correct?
Optical fibre is based on which of the following principles? a. Principle of reflection of light b. Principle of refraction of light c. Principle of total internal reflection d. Principle of dispersion of light