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Electronics and Communication Engineering (ECE) Exam  >  Electronics and Communication Engineering (ECE) Test  >  Electronic Devices  >  Test: Optical Absorption - Electronics and Communication Engineering (ECE) MCQ

Optical Absorption - Free MCQ Practice Test with solutions, GATE ECE Engineering


MCQ Practice Test & Solutions: Test: Optical Absorption (5 Questions)

You can prepare effectively for Electronics and Communication Engineering (ECE) Electronic Devices with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: Optical Absorption". These 5 questions have been designed by the experts with the latest curriculum of Electronics and Communication Engineering (ECE) 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 15 minutes
  • - Number of Questions: 5

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*Answer can only contain numeric values
Test: Optical Absorption - Question 1
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A photo diode is illuminated by light with 700 nm wavelength and power of 4 mW. If the open circuit current produced is 1mA then the internal quantum efficiency of photo diode is


Detailed Solution: Question 1

Current generated I = P0 × R
Given P0 = 4 mw

*Answer can only contain numeric values
Test: Optical Absorption - Question 2
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A Germanium sample of dimensions 1 cm x 1 cm is illuminated with a 20 mW, 600 nm laser light source as shown in the figure. The illuminated sample surface has a 100 nm of loss-less Silicon dioxide layer that reflects one-fourth of the incident light. From the remaining light, one-third of the power is reflected from the Silicon dioxide-Germanium interface, one-third is absorbed in the Germanium layer, and one-third is transmitted through the other side of the sample. If the absorption coefficient of Germanium at 600 nm is 3 x 104 cm-1 and the bandgap is 0.66 eV, the thickness of the Germanium layer, rounded off to 3 decimal places, is ______ μm.


Detailed Solution: Question 2

Incident power = 20 mW = Pi

Reflected power (Pr) from SiO2 is one-fourth, i.e

Power left will be:

From this  power, the power reflected from Ge Interface is:

Now, the power absorbed in the Germanium layer is:

Power Transmitted through the other side of the sample is:

The power entering Germanium Sample = Power absorbed + Power Transmitted, i.e.


α = absorption coefficient

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Test: Optical Absorption - Question 3
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A silicon semiconductor slab has absorption coefficient of 102 cm-1 at wavelength of 1 μm. If 90% of the incident flux is to be absorbed then the thickness of the slab required is:

*Multiple options can be correct
Test: Optical Absorption - Question 4
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Photons absorbed in matter are converted to heat. A source emitting n photon/sec of frequency ν is used to convert 1kg of ice at 0°C to water at 0°C. Then, the time T taken for the conversion

Detailed Solution: Question 4

Concept:

The amount of energy released or absorbed is given by
E = mL
where m is the mass of the substance and L is the Latent Heat.

Solution:
Energy used in the conversion of ice to water is given by 
⇒ mL = 1000 g x 80 cal g-1 = 80000 cal
The energy of the photon absorbed is given by
⇒ nT x E = nT x hν
⇒ nThν = mL

Test: Optical Absorption - Question 5
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The absorption coefficient of semiconductor materials is strongly dependent on __________

Detailed Solution: Question 5

In some common semiconductors, there is a variation in absorption curves for materials. It is found that they are each suitable for different wavelength and related applications. This is due to difference in band gap energies. Thus absorption coefficient depends on wavelength.

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About this Electronics and Communication Engineering (ECE) Practice Test

This test contains 5 MCQs on Optical Absorption with detailed solutions for each question. It is part of the Electronic Devices course on EduRev, designed to align with the current Electronics and Communication Engineering (ECE) syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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If you found this Optical Absorption MCQ Test helpful, you can further enhance your Electronics and Communication Engineering (ECE) preparation with in-depth courses on EduRev, for all the subjects and topics available in Electronic Devices course. The course offers:
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  • MCQ Test: variety of questions as per the pattern of Electronics and Communication Engineering (ECE) exam
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