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# Despite their acronymic similarity, LEDs and LCDs represent distinct

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SC Moderator
Joined: 23 Sep 2015
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Re: Despite their acronymic similarity, LEDs and LCDs represent distinct  [#permalink]

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05 Oct 2018, 08:36
1
u1983

Following lines are used for Q3:

LCDs that are capable of producing color images, such as in televisions and computers, reproduce colors by blocking out particular color wavelengths from the spectrum of white light until only the desired color remains. The variation of the intensity of light permitted to pass through the matrix of liquid crystals enables LCD displays to present images full of gradations of different colors.

you have to think about a choice which is similar to the given system. let me tell you this in simple terms. hope you know light has 7 colours. the text says that when light pass through matrix it send out 1 colour while absorbs the rest. so one can see that colour only.

on similar pattern find a system which can filter something while let go other. Only B does . Big boxes will be stopped. small will be passed.

In other options everything will pass. Hope it is helpful.
_________________
Thanks!
Do give some kudos.

Simple strategy:
“Once you’ve eliminated the impossible, whatever remains, however improbable, must be the truth.”

GMAT Ninja YouTube! Series 1| GMAT Ninja YouTube! Series 2 | How to Improve GMAT Quant from Q49 to a Perfect Q51 | Time management

My Notes:
Reading comprehension | Critical Reasoning | Absolute Phrases | Subjunctive Mood
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Re: Despite their acronymic similarity, LEDs and LCDs represent distinct  [#permalink]

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05 Oct 2018, 08:41
aragonn wrote:
u1983

Following lines are used for Q3:

LCDs that are capable of producing color images, such as in televisions and computers, reproduce colors by blocking out particular color wavelengths from the spectrum of white light until only the desired color remains. The variation of the intensity of light permitted to pass through the matrix of liquid crystals enables LCD displays to present images full of gradations of different colors.

you have to think about a choice which is similar to the given system. let me tell you this in simple terms. hope you know light has 7 colours. the text says that when light pass through matrix it send out 1 colour while absorbs the rest. so one can see that colour only.

on similar pattern find a system which can filter something while let go other. Only B does . Big boxes will be stopped. small will be passed.

In other options everything will pass. Hope it is helpful.

This is exactly why I got confused........ I got B..... in the similar line of reasoning...... But the OA is C.......
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Please let me know if I am going in wrong direction.
Thanks in appreciation.
SC Moderator
Joined: 23 Sep 2015
Posts: 1746
Re: Despite their acronymic similarity, LEDs and LCDs represent distinct  [#permalink]

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05 Oct 2018, 08:44
u1983 wrote:
aragonn wrote:
u1983

Following lines are used for Q3:

LCDs that are capable of producing color images, such as in televisions and computers, reproduce colors by blocking out particular color wavelengths from the spectrum of white light until only the desired color remains. The variation of the intensity of light permitted to pass through the matrix of liquid crystals enables LCD displays to present images full of gradations of different colors.

you have to think about a choice which is similar to the given system. let me tell you this in simple terms. hope you know light has 7 colours. the text says that when light pass through matrix it send out 1 colour while absorbs the rest. so one can see that colour only.

on similar pattern find a system which can filter something while let go other. Only B does . Big boxes will be stopped. small will be passed.

In other options everything will pass. Hope it is helpful.

This is exactly why I got confused........ I got B..... in the similar line of reasoning...... But the OA is C.......

Dude OA is given as B for Q3. I guess you are looking at someother question and mixed up.
_________________
Thanks!
Do give some kudos.

Simple strategy:
“Once you’ve eliminated the impossible, whatever remains, however improbable, must be the truth.”

GMAT Ninja YouTube! Series 1| GMAT Ninja YouTube! Series 2 | How to Improve GMAT Quant from Q49 to a Perfect Q51 | Time management

My Notes:
Reading comprehension | Critical Reasoning | Absolute Phrases | Subjunctive Mood
RC Moderator
Joined: 24 Aug 2016
Posts: 804
Concentration: Entrepreneurship, Operations
GMAT 1: 630 Q48 V28
GMAT 2: 540 Q49 V16
Re: Despite their acronymic similarity, LEDs and LCDs represent distinct  [#permalink]

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05 Oct 2018, 08:47
aragonn ...... Thanks a bunch .

aragonn wrote:
u1983 ------ I have explained Q1 in above post, let me know if it is not clear, I will try to bring in more light. Line of text are given.

1. According to the passage, the application of an electrical signal or current to both an LED and an LCD pixel results in which of the following?
Alternatively, applied electrical signals uncoil the crystals, causing the filters to block light and the pixel to become opaque
releases a photon, a specifically colored particle of light.

C. The LED becomes bright, but the LCD pixel ceases to transmit light. - no

I completely agree that 'uncoil' is a definite clue. But just for my curiosity , could u pls direct me to the part from where I can infer the first part of option C : |The LED becomes bright|
_________________
Please let me know if I am going in wrong direction.
Thanks in appreciation.
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Re: Despite their acronymic similarity, LEDs and LCDs represent distinct  [#permalink]

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05 Oct 2018, 08:52
aragonn wrote:
u1983 wrote:
aragonn wrote:
u1983

Following lines are used for Q3:

LCDs that are capable of producing color images, such as in televisions and computers, reproduce colors by blocking out particular color wavelengths from the spectrum of white light until only the desired color remains. The variation of the intensity of light permitted to pass through the matrix of liquid crystals enables LCD displays to present images full of gradations of different colors.

you have to think about a choice which is similar to the given system. let me tell you this in simple terms. hope you know light has 7 colours. the text says that when light pass through matrix it send out 1 colour while absorbs the rest. so one can see that colour only.

on similar pattern find a system which can filter something while let go other. Only B does . Big boxes will be stopped. small will be passed.

In other options everything will pass. Hope it is helpful.

This is exactly why I got confused........ I got B..... in the similar line of reasoning...... But the OA is C.......

Dude OA is given as B for Q3. I guess you are looking at some other question and mixed up.

No Man... I think something is jumbled up here.......... to test my hypothesis 'Please click option B at Q3 at the trimmer block ..... u will understand what happened. ...... let me know !!
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Please let me know if I am going in wrong direction.
Thanks in appreciation.
SC Moderator
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Posts: 1746
Re: Despite their acronymic similarity, LEDs and LCDs represent distinct  [#permalink]

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05 Oct 2018, 08:55
u1983 wrote:
aragonn ...... Thanks a bunch .

aragonn wrote:
u1983 ------ I have explained Q1 in above post, let me know if it is not clear, I will try to bring in more light. Line of text are given.

1. According to the passage, the application of an electrical signal or current to both an LED and an LCD pixel results in which of the following?
Alternatively, applied electrical signals uncoil the crystals, causing the filters to block light and the pixel to become opaque
releases a photon, a specifically colored particle of light.

C. The LED becomes bright, but the LCD pixel ceases to transmit light. - no

I completely agree that 'uncoil' is a definite clue. But just for my curiosity , could u pls direct me to the part from where I can infer the first part of option C : |The LED becomes bright|

We know that P1 is for LED P2 is for LCD. Lets focus on this part "The LED becomes bright". Following lines prove that. more over its full form is "light-emitting diodes".

When electric current flows through the p-n junction between layers, an n-type electron falling into a p-type hole releases a photon, a specifically colored particle of light.
_________________
Thanks!
Do give some kudos.

Simple strategy:
“Once you’ve eliminated the impossible, whatever remains, however improbable, must be the truth.”

GMAT Ninja YouTube! Series 1| GMAT Ninja YouTube! Series 2 | How to Improve GMAT Quant from Q49 to a Perfect Q51 | Time management

My Notes:
Reading comprehension | Critical Reasoning | Absolute Phrases | Subjunctive Mood
SC Moderator
Joined: 23 Sep 2015
Posts: 1746
Re: Despite their acronymic similarity, LEDs and LCDs represent distinct  [#permalink]

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05 Oct 2018, 08:57
Ah got it. inside box, answer is given as B out side its given as C. workout sir we need a fix here. make both as B
_________________
Thanks!
Do give some kudos.

Simple strategy:
“Once you’ve eliminated the impossible, whatever remains, however improbable, must be the truth.”

GMAT Ninja YouTube! Series 1| GMAT Ninja YouTube! Series 2 | How to Improve GMAT Quant from Q49 to a Perfect Q51 | Time management

My Notes:
Reading comprehension | Critical Reasoning | Absolute Phrases | Subjunctive Mood
RC Moderator
Joined: 24 Aug 2016
Posts: 804
Concentration: Entrepreneurship, Operations
GMAT 1: 630 Q48 V28
GMAT 2: 540 Q49 V16
Re: Despite their acronymic similarity, LEDs and LCDs represent distinct  [#permalink]

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Updated on: 05 Oct 2018, 09:07
aragonn wrote:
u1983 wrote:
aragonn ...... Thanks a bunch .

aragonn wrote:
u1983 ------ I have explained Q1 in above post, let me know if it is not clear, I will try to bring in more light. Line of text are given.

1. According to the passage, the application of an electrical signal or current to both an LED and an LCD pixel results in which of the following?
Alternatively, applied electrical signals uncoil the crystals, causing the filters to block light and the pixel to become opaque
releases a photon, a specifically colored particle of light.

C. The LED becomes bright, but the LCD pixel ceases to transmit light. - no

I completely agree that 'uncoil' is a definite clue. But just for my curiosity , could u pls direct me to the part from where I can infer the first part of option C : |The LED becomes bright|

We know that P1 is for LED P2 is for LCD. Lets focus on this part "The LED becomes bright". Following lines prove that. more over its full form is "light-emitting diodes".

When electric current flows through the p-n junction between layers, an n-type electron falling into a p-type hole releases a photon, a specifically colored particle of light.

Please excuse me if I am bothering you too much......... But again that is my point.

When applied electricity LED becomes bright ( as it releases photon).
But in the OA i.e.,D................ the 1st part is mentioned as 'The LED becomes dark,' ........... This is the point of my confusion.
_________________
Please let me know if I am going in wrong direction.
Thanks in appreciation.

Originally posted by u1983 on 05 Oct 2018, 09:03.
Last edited by u1983 on 05 Oct 2018, 09:07, edited 1 time in total.
RC Moderator
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Re: Despite their acronymic similarity, LEDs and LCDs represent distinct  [#permalink]

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05 Oct 2018, 09:05
aragonn wrote:
Ah got it. inside box, answer is given as B out side its given as C. workout sir we need a fix here. make both as B

Thanks ........ I got one more correct ( I am such a self-bragger !!!! )
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Re: Despite their acronymic similarity, LEDs and LCDs represent distinct  [#permalink]

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05 Oct 2018, 12:47
Manager
Joined: 21 Jun 2017
Posts: 234
Concentration: Finance, Economics
WE: Corporate Finance (Commercial Banking)
Re: Despite their acronymic similarity, LEDs and LCDs represent distinct  [#permalink]

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22 Oct 2018, 10:38
10 mins, alll correct. Perks of being an Electronics engineer
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Re: Despite their acronymic similarity, LEDs and LCDs represent distinct  [#permalink]

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22 Oct 2018, 22:34
2. The author most likely mentions “plasma” in the third paragraph in order to

A. provide an example of a technology that operates differently than LCDs
B. reinforce the importance of the commercial development of LCDs
C. describe the contrasting workings of another technology
D. indicate the greater number of applications for LCDs
E. explain the features of a competing type of display

For this question, I picked C but then I realized I made a blunder.

The author just mentioned about plasma ( like an example) but did not describe it.

Just a doubt

The amount of power required to untwist the crystals to display images is much lower than that required for analogous processes using other technologies, such as plasma. The dense array of crystals displays images from computer sources extremely well, with full color detail, no flicker, and no screen burn-in.

The BOLD and Underlined portion explains about the LCDs right and not Plasma? daagh GMATNinja bb
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Despite their acronymic similarity, LEDs and LCDs represent distinct  [#permalink]

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24 Oct 2018, 08:54
u1983 wrote:
workout .... need ur help on this piece pls (specifically 1 & 3 - really interested about the reasons for the wrong ones)

u1983
Answer to question # 1 lies in the sentences below:

LCD technology: Within a pixel, liquid crystals in their relaxed, coiled state rotate the polarization of ambient light enough to make surrounding filters transparent.

LED technology: Alternatively, applied electrical signals uncoil the crystals, causing the filters to block light and the pixel to become opaque. i.e not transperent

Answer to Question #3 is in the sentence below

LCDs that are capable of producing color images, such as in televisions and computers, reproduce colors by blocking out particular color wavelengths from the spectrum of white light until only the desired color remains.

So analogy is following

So LCDs can be programmed so, that they can scan only certain colors, just like the use of rigid sizing boxes at an airport security checkpoint in order to allow the passage of certain sizes of luggage while excluding other sizes of luggage
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Re: Despite their acronymic similarity, LEDs and LCDs represent distinct  [#permalink]

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04 Apr 2019, 21:45

2. The author most likely mentions “plasma” in the third paragraph in order to

A. provide an example of a technology that operates differently than LCDs
B. reinforce the importance of the commercial development of LCDs
C. describe the contrasting workings of another technology
D. indicate the greater number of applications for LCDs
E. explain the features of a competing type of display

The amount of power required to untwist the crystals to display images is much lower than that required for analogous processes using other technologies, such as plasma.
Why is it A. They have mentioned analogous process. Option A tells the operates differently.
Re: Despite their acronymic similarity, LEDs and LCDs represent distinct   [#permalink] 04 Apr 2019, 21:45

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