GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 16 Jan 2019, 04:25

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel
Events & Promotions in January
PrevNext
SuMoTuWeThFrSa
303112345
6789101112
13141516171819
20212223242526
272829303112
Open Detailed Calendar
  • The winning strategy for a high GRE score

     January 17, 2019

     January 17, 2019

     08:00 AM PST

     09:00 AM PST

    Learn the winning strategy for a high GRE score — what do people who reach a high score do differently? We're going to share insights, tips and strategies from data we've collected from over 50,000 students who used examPAL.
  • Free GMAT Strategy Webinar

     January 19, 2019

     January 19, 2019

     07:00 AM PST

     09:00 AM PST

    Aiming to score 760+? Attend this FREE session to learn how to Define your GMAT Strategy, Create your Study Plan and Master the Core Skills to excel on the GMAT.

Electrical engineers have developed an energy-efficient type of light

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

 
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 52140
Electrical engineers have developed an energy-efficient type of light  [#permalink]

Show Tags

New post 05 Jan 2019, 05:35
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

64% (01:31) correct 36% (01:37) wrong based on 117 sessions

HideShow timer Statistics

Electrical engineers have developed an energy-efficient type of light bulb that can replace the traditional incandescent bulb. The new bulb, known as the electronic lamp, operates by using a high frequency radio signal rather than the filament featured in incandescent bulbs. Although the electronic lamp currently costs 20 times as much as its traditional counterpart, its use will prove more cost effective in the long run. While a 100-watt incandescent bulb lasts 6 months if burned for 4 hours daily, a 25-watt electronic lamp used for the same amount of time each day lasts up to 14 years.

The argument above assumes that


A. the typical household use of a light bulb is approximately 4 hours a day

B. aside from its greater efficiency, the electronic lamp resembles the incandescent light bulb in most aspects

C. the type of light cast by the electronic lamp is different from that cast by an incandescent bulb

D. the price of electronic lamps will decrease as they are produced in increasingly greater quantities

E. a 100-watt incandescent light bulb does not provide significantly more light than a 25-watt electronic lamp

_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

Manager
Manager
User avatar
S
Joined: 28 Aug 2018
Posts: 190
CAT Tests
Re: Electrical engineers have developed an energy-efficient type of light  [#permalink]

Show Tags

New post 05 Jan 2019, 05:59
IMO E

conclusion: its use will prove more cost effective in the long
prethink: there are NO certain factors that reduce the efficiency of the regular bulb to Electronic bulb

A. the typical household use of a light bulb is approximately 4 hours a day---incorrect, stated in passage

B. aside from its greater efficiency, the electronic lamp resembles the incandescent light bulb in most aspects---incorrect, conclusion is concerned about cost and efficiency

C. the type of light cast by the electronic lamp is different from that cast by an incandescent bulb---Incorrect, quality of light is not the concern

D. the price of electronic lamps will decrease as they are produced in increasingly greater quantities---Incorrect, no long term concern

E. a 100-watt incandescent light bulb does not provide significantly more light than a 25-watt electronic lamp ---Correct, if the input remains the same but the output decreases significantly than the efficiency decreases
_________________

"Press +1 KUDOS"

Be very critical of my Post
Ask as many questions of my post possible

Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 52140
Re: Electrical engineers have developed an energy-efficient type of light  [#permalink]

Show Tags

New post 10 Jan 2019, 03:15
Bunuel wrote:
Electrical engineers have developed an energy-efficient type of light bulb that can replace the traditional incandescent bulb. The new bulb, known as the electronic lamp, operates by using a high frequency radio signal rather than the filament featured in incandescent bulbs. Although the electronic lamp currently costs 20 times as much as its traditional counterpart, its use will prove more cost effective in the long run. While a 100-watt incandescent bulb lasts 6 months if burned for 4 hours daily, a 25-watt electronic lamp used for the same amount of time each day lasts up to 14 years.

The argument above assumes that


A. the typical household use of a light bulb is approximately 4 hours a day

B. aside from its greater efficiency, the electronic lamp resembles the incandescent light bulb in most aspects

C. the type of light cast by the electronic lamp is different from that cast by an incandescent bulb

D. the price of electronic lamps will decrease as they are produced in increasingly greater quantities

E. a 100-watt incandescent light bulb does not provide significantly more light than a 25-watt electronic lamp


KAPLAN OFFICIAL EXPLANATION:



E

Here we need to identify an assumption. The author attempts to demonstrate that the "electronic lamp" can replace the incandescent bulb (that's the conclusion) because although the electronic lamp now costs much more, it will prove more cost effective in the long run (that's a summary of the evidence). He backs up this claim with numbers: A 25-watt electronic lamp can last 28 times longer than a 100-watt incandescent bulb while costing only 20 times as much as the bulb (thaT's the-hard evidence). There's one factor missing from the equation, though, and that's the amount of light the electronic lamp supplies. For the numbers given to support the author's conclusion, the electronic lamp and the normal bulb must each throw about the same amount of light. Otherwise, we might need 15 lamps for every bulb; and if this were the case, the argument would be dead wrong. Unless we assume, as (E) says, that the light produced by the lamp and the bulb is approximately equal, the evidence is meaningless.

(A) isn't assumed because the figure 4 hours a day doesn't have to represent typical household use; it need only provide a standard by which the lights can be compared. (B) is contradicted by the author. Since the electronic lamp operates by radio waves instead of a filament, it's clear that there are important structural aspects in which it differs from incandescent bulbs. (C) would actually make us doubt the reasonableness of the author's conclusion, so clearly it isn't assumed. If the electronic lamp is supposed to be a replacement for the incandescent bulb, its light should be similar to that produced by the bulb. (D) misconstrues why the electronic lamp is claimed to be cost effective in the long run-the point is that it lasts longer, not that it will become cheaper. The author is arguing that current electronic lamps are more cost effective, not that future lamps will be.
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

GMAT Club Bot
Re: Electrical engineers have developed an energy-efficient type of light &nbs [#permalink] 10 Jan 2019, 03:15
Display posts from previous: Sort by

Electrical engineers have developed an energy-efficient type of light

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


Copyright

GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.