Critical Reasoning

HI! Friends,
It's been almost three months since I am preparing for GMAT ( THE GMAT) .. I was wondering what is best way to learn critical reasoning , I was looking on the internet, Reading the articles , watching videos. Have been to one coaching institute, But nothing worked for me. It's always said take the Gmat Critical reasoning that somebody is actually arguing with you, and you have to deny his or argument .. and all those strengthening, weakling, assumptions and so on......
Whenever I am answering any question wrongly I read the explanation but if the say if you are doing one thing in this way why can't I do it that? And why you answer is the best ? why .. why.. why.. and there is no answer to that. So what I realize is that its best to put all those questions on the forum and than start fighting ( Not like the same that we have on our streets ) but almost like that we have in our friends when we say lets have some drink ( Beer ) and they say no its time for whisky... and then we go with all the stupid reasons in this world and start proving one better than another ( with the condition that both will have the same drink )
Lets do it that way I am putting up questions and I would request you guys if you are investing your time in reading the question and answering it, then just don't wait for correct answer and check whether you are right or wrong and move on. Infect put your thoughts with it may if are you able to answer it right because what I feel answering the question without looking at the answer chooses, will help you in increasing your speed by many times . Just give it a thought if I can guess this is the can be the assumption and then If I go for answer choices , there are very few chances of answering the question wrong.
So guys
Best of luck for the set of 5 questions.



Q.1 -
Although its purpose is laudable, the exclusionary rule, which forbids a court to consider evidence seized in violation of the defendant's constitutional rights, has unduly hampered law-enforcement efforts. Even when the rights violation was a minor or purely technical one, turning on a detail of procedure rather than one the abrogation of some fundamental liberty, and even when it has been clear that the police officers were acting in good faith, the evidence obtained has been considered tainted under this rule and may not even by introduced. In consequence, defendants who were undoubtedly guilty have been set free, perhaps to steal, rape, or murder again.
The author of the passage above assumes all the following EXCEPT:

a) Some of the defendants set free under the exclusionary rule have been guilty of serious criminal offenses.
b) Most cases in which the exclusionary rule has been invoked have involved purely technical violations of constitutional principles.
C) The number of cases whose outcome has been affected by exclusionary rule is significant.
D) The constitutional rights of criminal defendants should be protected.
E) Merely technical violations of the rules concerning evidence should be treated differently from deliberate assaults upon human rights.

Q.2-
Gloria : Those who advocate tuition tax credits for parents whose children attend private schools maintain that people making no use of a government service should not be forced to pay for it. Yet those who choose to buy bottled water rather than drink water from the local supply are not therefore exempt from paying taxes to maintain the local water supply.
Roger: Your argument is illogical. Children are required by law to attend school. Since school attendance is a matter not of choice, but of legal requirement, it is unfair for the government to force some parents to pay for it twice.
Which of the following responds by Gloria would best refute Roger's charge that her argument is illogical
a) Those who can afford the tuition at a high-priced private school can well bear the same tax burden as those whose children attend public schools.
b) If tuition tax credits are granted, the tax burden on parents who choose public schools will rise to an intolerable level.
c) Both bottled water and private schools are luxury items, and it is unfair that some citizens should be able to afford then while others cannot.
d) Although drinking water is not required by law, its it necessary for all people, and therefore my analogy is appropriate.
e) The law does not say that parents must send their children to private schools, only that the children must attend some kind of school, whether public or private.

Q.3 -
Since the passage of the state's Clear Air Act ten years ago, the level of industrial pollutants in the air has fallen by an average of 18 percent. This suggests that the rule restrictions on industry embodied in the act have worked effectively. However, during the same period the state has also suffered through a period of economic decline. The number of businesses in the state has fallen by 10 percent, and the number of workers employed has fallen by 12 percent. It is probable that business decline, rather than regulations in the act, is responsible for at least half of the decline in the pollution.

Which of the following is an assumption made in the passage above?
a) The amount of air pollution in a given area is likely to be proportional to the number of businesses and workers active in that area.
b) The restrictions on business activity in other states are less stringent that are those embodied in the Clean Air Act.
c) Most businesses in the state have obeyed the regulations embodied in the clean Air Act.
d) The economic decline of the state can be attributed, in part, to the effects of the Clean Air Act.
e) The Clean Air Act has been only very slightly successful in achieving the goal of reduced air pollution.

Q.4-
Since the passage of the state's Clear Air Act ten years ago, the level of industrial pollutants in the air has fallen by an average of 18 percent. This suggests that the rule restrictions on industry embodied in the act have worked effectively. However, during the same period the state has also suffered through a period of economic decline. The number of businesses in the state has fallen by 10 percent, and the number of workers employed has fallen by 12 percent. It is probable that business decline, rather than regulations in the act, is responsible for at least half of the decline in the pollution.
Which of the following, if true, would most seriously weaken the conclusion drawn in the passage above?
a) Due to its small budget, the state office charged with enforcement of the Clean Air Act has prosecuted only two violators of the law since its passage.
b) Amendments to the Clean Air Act that were enacted six years ago have substantially strengthened its restrictions on industrial air pollution.
c) Several large corporations left the state during the last ten years partly in order to avoid compliance with Clean Air Act.
d) During the last ten year, economic conditions in the nation as a whole have been worse than those with in state.
e) Of the businesses that ceased operating in the state during the last ten years, only 5 percent were engaged in air-polluting industries.

Q.5 -
A nutritionist studying the efforts of massive doses of vitamin C found that of group of 600 people who regularly took 1,500 mg of vitamin C daily for a year, fewer than 9 percent suffered serious cases of flu; of a group of 600 people who took 250 mg of vitamin C (the standard recommended daily allowance) daily for a year, 34 percent suffered at least one serious case of flu; and group of 600 people who took no vitamin C for a year ( other than found in the food in a balanced diet ), 32 percent suffered at least one serious case of flu.
Which of the following hypothesis is best supported by the evidence above?
a) Doses of vitamin C that exceed the standard recommended daily allowance by 500 percent will reduce the incidence of serious cases of flu by 25 percent.
b) Massive doses of vitamin C can help to prevent serious case of flu.
c) A balanced diet contains less than 250 mg of vitamin C.
d) The effectiveness of vitamin C in preventing serious cases of flu increases in direct proportion of the amount of vitamin C taken.
e) Vitamin C is helpful in preventing diseases.