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Online CAT 2009: Punch Of the Week (14-July-09)

Author: Sureshbala

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Every week Learnhub's team will post one question each on Verbal Ability and Quantitative Ability of the GMAT Test Preparation
Members can post their answers along with explanations for the next one week.
After one week, Learnhub's team will post the official answer along with the explanation.Besides answering the previous week's questions, Learnhub's Team will come up with the next set of questions for that week as well.

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"Punch Of The Week" Team Members

This Week's Punches

Critical Reasoning
Heavy snow fall in the Sierra Nevada Mountains is usually preceded by subzero temperatures in northwestern Canada. When snow fall is high in Canada's northwestern provinces, the same storm typically produces heavy snows in the Sierra Nevadas. Therefore, subzero temperatures cause winter snow storms to rebuild as they move down from Canada to the Sierra Nevadas.
Which selection contains the same type flaw as that contained in the passage above?

(A) Professional golfers tend to have lean builds. Therefore, professional golfers typically have healthy eating habits.
(B) People tend to write larger when they use wide-ruled notebook paper than when they use narrow-ruled paper. Therefore, people write more neatly on the wideruled paper.
(C) Students who participate in debate in high school often end up as trial lawyers. Therefore, participating in high school debate must somehow influence students to attend law school.
(D) During the hottest part of the day, song birds do not visit unshaded feeders. Therefore, song birds must visit the feeders before dawn.
(E) The kind of shows on Broadway can impact the type of shows premiered during new television seasons. Therefore, if the new Broadway shows feature aliens as characters in

Quantitative Ability
If P + Q varies directly with P - Q ,then P^2 + Q^2

varies directly with

I. PQ

$III. \frac{P}{Q}$

A. Only I
B. Only II
C. Both I and II
D. Both I and III
E. Both II and III

Click here for last week's Punch and explanatory answers for the same

Posted on 22-July-09

So,folks here are the correct answers

Critical Reasoning
The correct answer is C.

The author of this passage uses a false correlation in his argument. He assumes that subzero temperatures lead to heavy snow storms in the Sierra Nevada Mountains. The author doesn't recognize that some other weather condition might lead to both the subzero temperatures and the heavy snow storms. As you look over the answer selections, it appears that selection C makes the same mistake. In C, it is assumed that participation in high school debate must influence students to attend law school. Instead, perhaps a student's interest in public affairs or some other subject causes her to take high school debate classes and go to law school. The argument doesn't contemplate another possible cause. Thus, selection C is the correct answer. The other selections also contain flaws, but they do not pattern the same defect contained in the passage.

Quantitative Ability
The correct answer is C.

Given that $P+Q \alpha (P-Q)$
$\Rightarrow P+Q=k(P-Q),$ where k is the proportionality constant
$\Rightarrow P+Q)(P+Q)=k(P-Q)(P+Q)$
$\Rightarrow P^2 + Q^2 + 2PQ = k(P^2- Q^2)$
$\Rightarrow P^2+Q^2=k(P^2-Q^2 )-2PQ$
$\Rightarrow P^2+Q^2$ varies directly with both $P^2-Q^2 \quad and \quad PQ.$
Hence, option C.

Click here for the next week's Punch