UCAT: Decision Making

[sunnyrain]

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[89012]

Hello.
I don't quite understand this question. I was wondering if someone was able to explain it to me? What is the 2nd and 3rd column actually telling us?

View attachment 3747
View attachment 3748

Compounds A and B are antifreeze substances, when added at different concentrations (1st column) they drop the freezing temperature of water to the temperatures listed. So for the 3rd question, when the temperature is -6 degrees, basically any compound at any of the concentrations will prevent water from freezing since it drops the temperature below -6 degrees. For question 5, compound A seems to cap at a freezing point of -51 degrees, where as compound B caps at -48 degrees and actually is less effective when used in higher concentrations, so compound A does have a lower freezing point compared to compound B.

 

[sunnyrain]

But since the temperatures go below -6 degrees, doesn't that mean, the substances don't prevent the freezing? Since they're making the compounds more frozen?

 

[89012]

But since the temperatures go below -6 degrees, doesn't that mean, the substances don't prevent the freezing? Since they're making the compounds more frozen?

So for example, compound A at 20% concentration will drop the water's freezing temperature to -7 degrees. If the external temperature is -6 degrees, this is technically "warmer" than -7 degrees, meaning the water will not freeze. The same goes for all the other concentrations for both compounds as it drops the temperature of the water lower than -6 degrees.

But since the temperatures go below -6 degrees, doesn't that mean, the substances don't prevent the freezing? Since they're making the compounds more frozen?

I think what you're misunderstanding is what action the compounds have on water? They don't actually decrease the temperature of the water, they change the freezing point of water from its usual freezing temperature (0 degrees). Correct me if I'm wrong.

 

[sunnyrain]

Ohhh, that makes so much more sense! Thank you for your help!!

 

[AJ]

Hi guys, would love if I could get some step by step working for these types of questions (algebra). Thanks

 

[N182]

View attachment 3757Hi guys, would love if I could get some step by step working for these types of questions (algebra). Thanks

Let incorrect answers be x. Then correct answers must be 24+x. We know:
I+C=30
so x+24+x=30
2x+24=30
2x=6
x=3
So they answer 3 incorrect and 27 correct. (alternatively you can guess and check but this might be more time-consuming).
14 of the correct answers are history so 27-14=13 must be geography
2 of the incorrect answers are history so 3-2=1 must be geography

 

[sevun]

I always have trouble with questions where they give Venn diagrams with different shapes and you have to pick the correct statement based on data presented in the diagram: eg. More than 30% of young doctors participate in yoga, and so you look at the shape representing doctors, then the shape representing yoga etc. and figure it out using numbers from the Venn diagram. Anybody found any helpful tips on doing these questions?


Also, could anyone please share their tips when it come to selecting strongest argument questions?
I found that I used to be quite good, but on the official resources, each answer is often quite wordy and seem valid, even though some are clearly not related to the point. Other times, there doesn't seem to be one argument which stands out and I get confused between two/three of the options.

I've looked through the past posts and people say pick the option which addresses all aspects of the question, but sometimes the options either don't appear to address any aspects (brain gets confused) or two of them do and I can't pick between them.

 

[fm8]

Hey!
I have a question regarding DM that had recently been discussed on this forum,

so all apples are red.... and the statement states that .. some apples are red, would this be YES or NO?

Someone previously had stated it is a NO, and some implies not all.
however im looking at the the DM tutorial on the actual UCAT site, and the question states

children are either boys or girls. some of mrs B's children are girls, the rest are asleep.

statement is: Some of the sleeping children are boys - YES (reason states that - all of the boys are asleep, and there is at least one)

so now this confuses me,

what are your thoughts ??

 

[A1]

so all apples are red.... and the statement states that .. some apples are red, would this be YES or NO?

We have discussed this before in the DM thread. All => Some is a valid syllogism as shown in this
> File:Modus Barbari.svg - Wikipedia

However an MSO user has received an email from UCAT that for UCAT, Some is less than All (thus to be treated as not the same as All).

 

[sevun]

Condition: "Red cars without wheels have turbos."
Stem: "At least some red cars have turbos."

Personally I would say YES. The condition is alluding to the fact that there are red cars with wheels and red cars without wheels. Those with wheels may/may not have turbos. Those without wheels WILL have turbos. Thus the conclusion can be made that "At least some red cars have turbos".

Hm I'm not sure if I agree with this. In one of the DM banks on the official UCAT sites, they had a question like some plants are creepers without branches, and the question was There are some creepers with branches. The answer to this was No, since we do not know whether there are creepers with branches, only without.

 

[sevun]

For 3/5 here, I was wondering if the answer should have been No:

It is similar to the psychologists question that has been asked many times before, but I got the wrong answer, even though I used the same logic from before. The way I read this question is not all atoms that have neutrons have protons. But for atoms with neutrons and more than one electron, they 100% of the time contain protons. Am I wrong?

 

[Daniel456]

How do you even solve this question? Is it possible to do it in 90 sec? There are so many combinations!!

 

[2xq]

View attachment 3762

How do you even solve this question? Is it possible to do it in 90 sec? There are so many combinations!!

its possible to do in 90 secs. i literally just eyeballed the problem.

1st bit of info. BC and S same consumption.
2nd but Coffee Lightest (thus 8kg)
3rd opening weight of S is heavier than BC but lighter than C. From Heaviest to Lightest itll be C>S>BC
4th V halved and C 2nd highest consumption. so we know that V (28 to 14)

now we know that because BC and S are same consumption, the closing minus opening are same thus (BC 15 to 13 and S 17 to 15. 2kg each)

now because V opening was 28 and BC and S have 15 and 17, C must start with 21 and must end with 16 (2nd highest consumption and heavier than S when starting)

21-16 is 5kg

 

[Daniel456]

its possible to do in 90 secs. i literally just eyeballed the problem.

1st bit of info. BC and S same consumption.
2nd but Coffee Lightest (thus 8kg)
3rd opening weight of S is heavier than BC but lighter than C. From Heaviest to Lightest itll be C>S>BC
4th V halved and C 2nd highest consumption. so we know that V (28 to 14)

now we know that because BC and S are same consumption, the closing minus opening are same thus (BC 15 to 13 and S 17 to 15. 2kg each)

now because V opening was 28 and BC and S have 15 and 17, C must start with 21 and must end with 16 (2nd highest consumption and heavier than S when starting)

21-16 is 5kg

When you break it down like that, it seems so much easier! Thanks a lot =)

 

[realwalterwhite]

Kind of a stupid question, but can many = all?

I also would like to know this? Does anyone know?

 

[sevun]

I also would like to know this? Does anyone know?

I emailed them and they said it is equal to some and not all!

 

[kcx]

Hi, could someone please explain the last conclusion 'either more or less than'?? Does this not mean either more than 5 feet tall or less than 5 feet tall.

 

[N182]

View attachment 3774
Hi, could someone please explain the last conclusion 'either more or less than'?? Does this not mean either more than 5 feet tall or less than 5 feet tall.

Yeah so basically x<5 or x>5 basically everything except x=5, which is clearly said in the stem.

 

[kcx]

Yeah so basically x<5 or x>5 basically everything except x=5, which is clearly said in the stem.

I see, I assumed that not equal to 5 is less than five. Thanks for the help!