couple questions on practice DATs

[sherry225]

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Hi,

I was doing some practice questions on DAT. However, I run into a couple questions. I was wondering if anyone can help me out on these. Much thanks!

1. (Chem) How do you compare the magnitude of heat of vaporization and heat of fusion on a heating curve? I thought I learned that you compare them by looking at how "long" each plateau is. However,on Kaplan's DAT final #69, the heat of vaporization is clearly shorter than the heat of fusion......but the answer said that the heat of vaporization is greater? I'm confused......

2. (Bio) one of the questions on topcore 1 asked about the Ascaris and Turbatrix. Do we need to know the specific genus on the real DAT? I know we should know the phylums that were mentioned in the Kaplan book, but how about class, order, family, genus, and species names of certain animals? If we should know some of them, which ones should we really know?

3. (math) also one of topscore 1 question. Two chords AB and CD interesect in a circle at point E. If AE=4, AB=5, CE=2, then what's DE?
Answer is 2


Thanks very much!

 

[HBomb]

I'll take a cut at this:
1. The DAT answer is wrong. In fact, for this question, because the answer choice is wrong, there is no correct answer choice. Good catch on this one.

3. This is how you work this problem:For two intersecting chords, length AE x length EB = length CE x length ED
So since AE = 4, and AB = 5, then EB = 1. Plug this in along with CE =2 and you get length ED = 2.

2. Good question on #2. I'm not sure. I don't think I had anything at the species level. I guess it's good to know the common organisms that belong in the major animal phyla. What I'm saying is that in this case, you should know the characterizations of the animal phyla. In this case, you should know some things about phylum nematoda (round worm, longitudinal muscles, no circular muscles, etc) and that it's good to know the ascaris worm and turbatrix falls under it. But again, I'm not sure if anything beyond the phylum level is required.

 

[sherry225]

HBomb,

Thanks for your help! 🙂