100 Hardest CR Questions on the Forum

Question

100 Hardest Critical Reasoning Questions

Are you familiar with the GMAT Club's timer? We have pulled timer results from our database and analyzed every question in the forum. Based on those results, we have compiled a list of the hardest questions in each of the question forums we have. Below I am presenting to you the top 100 questions from CR forum.

Critical Reasoning (CR)
Rank	Title	Topics
1	At present the Hollywood Restaurant has only standard-height	Weaken/Debatable OA
2	Beginning in 1997, high school seniors in State Q have been	Conclusion/Numbers & Percent
3	The rise in free, do-it-yourself instructions on the	Inference
4	In Patton City, days are categorized as having heavy	Conclusion/CR Resources
5	In Patton City, days are categorized as having heavy	Inference/Must be True
6	A veterinary pharmaceutical manufacturer implemented	Debatable OA/Evaluate Argument
7	Studies have shown that a large percentage of car accidents	Inference
8	Two types of earthworm, one black and one red-brown, inhabit	Strengthen/Numbers & Percent
9	When cable TV consumers evade cable access fees by	Assumption
10	Modern navigation systems, which are found in most of today	Bold Face CR/Numbers & Percent
11	In a monogamous culture, 100% of the adults are married. The	Inference/Cause and Effect
12	Iridium, a hard, whitish metal similar to platinum, is	Strengthen
13	Gasoline Cars in Papula Country	Weaken
14	According to recent research, a blindfolded person whose	Assumption
15	Recently, the research and development departments at major	Assumption
16	Recently, some critics of the U.S. government have pointed	Weaken
17	Certain instruments used in veterinary surgery can be made	Additional Evidence/Must be True
18	The rise in free,do-it-yourself instructions on the internet	Inference
19	Lark Manufacturing Company initiated a voluntary Quality	Strengthen/Weaken
20	Psychologist: Though popularized by the media and even some	Strengthen
21	Greek tragedy, one of the enduring pillars of our belief	Resolve Paradox
22	The Daisygen Company genetically engineers flowers which are	Assumption
23	Literary critics are concerned by a recent trend in book	Evaluate Argument
24	Nearly all mail that is correctly addressed arrives at its	Must be True
25	Advocates argue that five-cent bottle deposits charged on	Evaluate Argument
26	Consumer Advocate: The new soft drink, Mango Paradise,	Assumption
27	Biologists have noted reproductive abnormalities in fish	Weaken
28	Last January, in an attempt to lower the number of traffic
29	In order to raise revenue, the federal government planned a	Strengthen
30	Surveys show that every year only 10 percent of cigarette	Conclusion/Numbers & Percent
31	Left-handed persons have an advantage over right-handed	Inference
32	In the modern era, society should accept the premise that	Weaken/CR Resources/Debatable OA
33	Instead of blaming an automobile accident on driver error,	Assumption
34	The snack food market has recently seen an explosion in the	Additional Evidence
35	Brunhilda: Economists have predicted that our generation	Evaluate Argument/Logical Flaw/Method of Reasoning
36	Ellen: All three of Shirley's children have the measles!	Assumption
37	Farmers get water at subsidized rates that are much lower	Evaluate Argument
38	Doctors in Britain have long suspected that patients who	Weaken
39	In a survey of all 14,000 undergraduates in a University, ov	Method of Reasoning
40	In a forest often visited by the residents of a small town..	Additional Evidence/Debatable OA
41	In response to years of increasing congestion at airport X,	Strengthen
42	Delta products, Inc., has recently switched at least partly	Bold Face CR
43	Choi: All other factors being equal, children whose parents	Logical Flaw
44	In the late nineteenth century, the archaeologist Charles	Assumption/Out of Scope - Too Hard
45	Proponents of airline industry deregulation argued that airl	Assumption
46	In 1986, the city of Los Diablos had 20 days on which air	Additional Evidence/Numbers & Percent
47	A product that represents a clear technological advance over	Bold Face CR
48	Archaeologists have recently found in various grave sites in	Method of Reasoning
49	Because the government of Laconia provided considerable tax	Bold Face CR
50	Research has shown that impoverished people in this country	Similar Reasoning
51	Some say that an asteroid colliding with Earth was	Assumption/Similar Reasoning
52	Critic: Works of literature often present protagonists who	Assumption
53	A product that represents a clear technological advance over	Bold Face CR
54	Now problems require new solutions. And new problems arise	Assumption/CR Resources
55	A Management protocol system	Conclusion
56	Wider use of central counterparties (CCPs)	Bold Face CR
57	A major film studio announced the release date of a movie	Debatable OA
58	If one of the effects of a genetic mutation makes a	Must be True
59	People who listen to certain recordings of music are in	Conclusion
60	Zero CO2 economy - a tricky one	Evaluate Argument
61	In 1986, the city of Los Diablos had 20 days on which air	Strengthen
62	If something would have been justifiably regretted if it had	Assumption
63	Since the new publisher took control, a news magazine s
64	Epidemiologist: In Brazil, schistosomiasis and malaria are	Strengthen
65	Studies show that children who listen too much classic music	Similar Reasoning
66	In one-round sealed-bid auctions, each prospective buyer	Resolve Paradox
67	Tiger beetles are such fast runners that they can capture	Weaken/Strengthen
68	All German philosphers, except for Marx, are idealists.	Inference
69	Michael: Marriage is increasingly a dying institution.	Assumption
70	The solution to any environmental problem that is not the	Assumption
71	In the years since the city of London imposed strict	Assumption
72	The subway system in New City has recently been running a	Strengthen
73	Which of the following most logically completes the passage	Complete the Passage
74	Dr. A: The new influenza vaccine is useless at best and	Similar Reasoning
75	On a recent expedition to a remote region of northern	Resolve Paradox
76	In a study of factors affecting employee satisfaction ,	Logical Flaw
77	At present the Hollywood Restaurant has only standard-height	Weaken
78	For the writers who first gave feudalism its name, the	Must be True
79	CR---Mayor of Plainsville	Assumption
80	Publicity campaigns for endangered species are unlikely to	Assumption
81	On a recent expedition to a remote region of northern	Resolve Paradox
82	The noise caused by airplanes during takeoff and landing	Bold Face CR
83	The Earth s rivers constantly carry dissolved salts into its	Assumption
84	Recent advances in surgical procedures have not decreased
85	Products with innovative and appealing designs relative to	Bold Face CR
86	Radio stations with radio data system (RDS) technology	Assumption
87	Monarch butterflies, whose average life span is nine months,	Complete the Passage
88	Doctor: While a few alternative medicines have dangerous	Weaken
89	In the Business program at a university, all candidates for	Must be True/CR Resources
90	A team of researchers from MIT studied the effects of	Weaken
91	On some hot days the smog in Hillview reaches unsafe levels,	Logical Flaw
92	A new species of fish has just been discovered living in	Inference
93	Choi: All other factors being equal, children whose parents	Evaluate Argument
94	Automobile manufacturers often offer incentive programs
95	The climbing season of 2006 was the deadliest on record for	Resolve Paradox
96	Each week, the Department of Defense sends food packages	Inference
97	Assumption-- Singing in the rain umbrella	Assumption
98	Radio Stations with radio data system (RDS) technolodgy	Assumption
99	Although the price of gasoline can sometimes reach uncomfort	Evaluate Argument
100	From an article in the Wall Street Chronicle: ...	Must be True

A note about difficulty and how we determine the hardest questions - we use the GMAT Club timer and user statistics. We use both % of correct answers as well as the average time used. Though this list is very accurate, please keep in mind that minor shifts are expected over time.

bagdbmba · Accepted Answer

GNPTH - you wish has come true :wink:

Here it's for SC https://gmatclub.com/forum/100-hardest-sc-questions-on-the-forum-162101.html

Carcass · Answer

You deserve...... :-D

bagdbmba · Answer

Simply superb. I wish if we could get another 100 :wink:

avohden · Answer

Is there a reason that some of the questions are duplicates (eg. 86 & 98, 4 & 5, and 43 & 93)?

bb · Answer

Thank you - I did not have time to clean this list; that's the main reason, but in reality it is just some questions do get discussed multiple times... esp the hard ones. That's mostly because users do not use the search function. I will clean it up - we have also found a few questions that need to be pulled off this list due to incorrect answers - thank you WaterFlowsUp!

avohden · Answer

BB- I can save you a little time regarding duplicates. I copied and pasted the list into excel, then sorted and the list by topic. It enabled me to see the duplicates easily since they were right next to each other. I found a couple more duplicates. Entire List included here: 
1 & 77, 3 & 18, 4 & 5, 43 & 93, 46 & 61, 47 & 53, 75 & 81, 86 & 98. Funny - I noticed that since you have two independent samples from each of the duplicates the results are surprisingly similar (e.g 4 & 5, 47 & 53 and 75 & 81.

avohden · Answer

I must say that this list is very helpful to refine your skills as you improve and reach the upper level of CR. Kudos x 100. :-D

On another note - I did a quick analysis of the results on the list and thought it may be useful in terms of what people struggle with. The top categories of the top 100 CR questions are as follows (list factors out duplicates and does not include unspecified categories: Assumption - 24% Weaken - 11% Inference - 9% Strengthen - 9% Bold Face - 8% Evaluate the Arg - 8% Hope its useful.

Gnpth · Answer

Wow, Good list BB :good

Hope if possible doing it for SC as well :roll:

Thanks Avohden For you analysis of the repeat questions. Kudos to you both..

WaterFlowsUp · Answer

Friends , Thanks so much for liking the list. I can't emphasis further on how much I am thankful to BB for such an important list. To enhance the goodness , BB has come up with a new set of SC questions. Avohden , great job. Even I missed out that redundant part of the list. I would request users to solve those questions and provide us the feedback if anything is found debatable. BB, Welcome

. I suppose it might be better if we can have "EXCEPT" tag to correctly specify. I found 1 question to be faulty, which needs to be removed off the list along with the redundant ones. We also need proper tagging on the source, this is because few sources are unpopular for coming up with the faulty questions and debatable OAs. 1 more request, can we have the list expanded to 200? Thanking all for the support and coordination.

pqhai · Answer

Thanks BB, excellent work!
Best.

lilugmat · Answer

Thank you for sharings. I must improve this section.

Posted from my mobile device

manishbhusal · Answer

Are these Questions avaliable in Pdf format by any chance ?

ssmohanta · Answer

The questions here seems to be pretty tough at least timing wise.
I just visited this thread after solving the hard section from GMATPrep but found the questions here way too difficult.

StoicBread · Answer

This thread is garbage. It's riddled with wrong OA's and poorly written, non-GMAC questions.

Carcass · Answer

First of all, you could say the same concept more politely. Respecvting who does this job for the community.
Secondly, the questions are from several sources such as MGMAT and others..........

Thank you

StoicBread · Answer

Yes, I apologize for the harsh language. GMATClub is a immensely helpful tool for those studying for the test.

I will put it in politer terms: The moderators should look through this thread for wrong OA's and poorly written questions.

Carcass · Answer

Look at this one for instance instead-of-blaming-an-automobile-accident-on-driver-error-137260.html

From MGMAT yet it adheres to the rules for posting a question on the board.

I do really think is a good question written by a well-established prep company.

There is nothing wrong in the compilation provided by the gmatclub

StoicBread · Answer

There are a few where the OA provided is questionable. I've been going through most and can't remember which ones exactly.

Again, I apologize for my harsh remarks.

mr.adsingh · Answer

Is there any overlap with GMATprep Tests?

Thanks
AD

100 Hardest CR Questions on the Forum

Prep Toolkit

Top 5 GMAT Debrief Videos

615 to 715 in 15 Days (Ria's Strategies)

More than Quant/Verbal Abilities: Speed vs. Accuracy

745 with Only Self-Prep and GMAT Club

From 555 to 765: 210-point Improvement

Perfect 805 Score Debrief by Julia

My Rewards

GMAT Critical Reasoning (CR) Questions

100 Hardest CR Questions on the Forum

Prep Toolkit

615 to 715 in 15 Days (Ria's Strategies)

More than Quant/Verbal Abilities: Speed vs. Accuracy

745 with Only Self-Prep and GMAT Club

From 555 to 765: 210-point Improvement

Perfect 805 Score Debrief by Julia

My Rewards