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Free GRE Full Length CBT Test 18

Question: 1

Passage

By contrast, in the sciences it is difficult to identify greatness without the benefit of historical perspective. Any scientific theory might be disproved tomorrow, thereby demoting the theorist’s contribution to the status of historical footnote. Or the theory might withstand centuries of rigorous scientific scrutiny. In any event, a theory may or may not serve as a springboard for later advances in theoretical science. A current example involves the ultimate significance of two opposing theories of physics: wave theory and quantum theory. Some theorists now claim that a new so-called “string” theory reconciles the two opposing theories, at least mathematically. Yet “strings” have yet to be confirmed empirically. Only time will tell whether string theory indeed provides the uniting laws that all matter in the universe obeys. In short, the significance of contributions made by theoretical scientists cannot be judged by their contemporaries, but only by scientists who follow them. In the realm of business, in some cases great achievement is recognizable immediately, while in other cases it is not. In sum, there have been many great individuals, particularly in the arts and in business, whose achievements were broadly recognized as great even during their own time.

Choose the correct answer

Based on the contents of the passage, it would be justified to conclude that the string theory

  1. is still in a hypothetical stage
  2. can be recognised as a great work of art only with the passage of time
  3. can be validated only by those scientists who have postulated the theory
  4. is of no consequence in Physics as of now
  5. has been verified practically

Correct Answer: A

Explanation:

The string theory is based on the concepts of Physics and so there is no question of recognising it as a work of art and hence, B is incorrect. It has been clearly brought out that the significance of theories like this can be best judged by scientists who follow them and not their contemporaries. Therefore, C is incorrect. The information, “string theory reconciles the two opposing theories, at least mathematically. Yet “strings” have yet to be confirmed empirically”, leads to the conclusion that the string theory has not yet been verified empirically or practically. This means that since it reconciles two opposing theories “mathematically”, it is in a hypothetical stage. However, this does not imply that it is of no consequence in Physics as of now. In view of the above, it is evident that A is the correct answer.

Question: 2

Passage

It is fascinating to find how the Bengalis, the Marathas, the Gujaratis, the Tamils, the Andhras, the Oriyas, the Assamese, the Kannads, the Malayalis, the Sindhis, the Punjabis, the Pathans, the Kashmiris, the Rajputs, and the great central block comprising the Hindustani-speaking people, have retained their peculiar characteristics for hundreds of years, have still more or less the same virtues and failings of which old traditions or records tell us, and yet have been throughout these ages distinctively Indian, with the same national heritage and the same set of moral and mental qualities. There was something living and dynamic about this heritage, which showed itself in ways of living and a philosophical attitude to life and its problems. Ancient India, like ancient China, was a world in itself; a culture and a civilization, which gave shape to all things. Foreign influences poured in and often influenced that culture and were absorbed. Disruptive tendencies gave rise immediately to an attempt to find a synthesis. Some kind of a dream of unity has occupied the mind of India since the dawn of civilization. That unity was not conceived as something imposed from outside, standardization of externals or even of beliefs. It was something deeper and, within its fold the widest tolerance of belief and custom was practised and every variety acknowledged and even encouraged.

Choose the correct answers

Based on the contents of the passage, it can be concluded that the Assamese, the Sindhis and the Rajputs

  1. have always had different cultural characteristics
  2. have traditions that conform to knowledge based on old records
  3. speak Hindustani
  4. have idiosyncratic Indian values
  5. have similar moral ethics

Correct Answer: A, B, D and E

Explanation:

As per the classification being referred to by the author, the Assamese, the Sindhis, the Rajputs and the “great central block comprising the Hindustani-speaking people” are different people. Therefore, C is clearly incorrect. The beginning of the passage makes it amply clear that the Assamese, the Sindhis and the Rajputs “have retained their peculiar characteristics for hundreds of years, have still more or less the same virtues and failings of which old traditions or records tell us, and yet have been throughout these ages distinctively Indian, with the same national heritage and the same set of moral and mental qualities”. This implies that A, B, D and E are all correct.

Question: 3

One religious civilization becomes the (1) ----------- of the next, and although all religions exist for the same (2) -----------, with the same essence of the faiths that have preceded them, each one (3) ----------- a unique link in the family of human civilizations as a whole.

Blank 1 Blank 2 Blank 3
  1. mother
  2. relative
  3. demand
  1. command
  2. factor
  3. purpose
  1. represents
  2. manages
  3. designs

Correct Answer: Mother, purpose and represents

Explanation:

The first blank here has to be completed with a word that can explain the relationship of the ascending civilizations, that too abiding by the grammatical structure of the sentence. The option, ‘demand’ is rejected outright. Among the rest two options, ‘mother’ provides a more defined relationship of the civilizations, therefore, it is the correct answer.

The next blank here has to be completed with a word that can explain the direction which the civilizations take for existence. The option ‘command’ seems irrelevant in the context of religion. Among the other two options, ‘factors’ can be an answer, but the meaning conveyed by it is better explained by ‘purpose’ which is therefore, the correct answer.

The last blank in the passage needs a word that can describe a trait of religious civilizations as such. We should notice the words that follow the blank and then choose an answer. The options ‘manages’ and ‘designs’ change the meaning of the sentence which do not seem acceptable in the context. The most relevant option given to us is thus, ‘represents’ which tells about the way in which each of the religious civilizations have denoted the entire family of human civilizations as such.

Question: 4

3x2-2, 3x2 +3, 5x2-10 are in A.P. and x2+15x-54=0

Column A Column B
x -18
  1. Quantity A is greater
  2. Quantity B is greater
  3. The quantities are equal
  4. The relationship cannot be determined from the information given

Correct Answer: A

Explanation:

Since the terms 3x2-2, 3x2 +3 and 5x2-10 are in AP, we have
2(3x2+3) = (3x2-2)+(5x2-10)
6x2+6=3x2-2+5x2-10
6x2-3x2-5x2=-2-10-6
-2x2=-18
x2=9
x=-3,3

x2+15x-54=0
x2+18x-3x-54=0
x(x+18)-3(x+18)=0
(x-3)(x+18)=0
x=3, -18

The value of x is 3.

Option A is correct.

Question: 5

There are 20 students in a group. In how many ways can two representatives be chosen?

Correct Answer: 190

Explanation:

Two representatives out of 20 can be chosen in C(20,2) ways
C(20,2)=20!/[(20-2)!2!]
= 20!/(18!2!)
= 20*19/2
= 190

Question: 6

The average of n numbers is n. If each number is multiplied by n, which of the following will be the new average? Indicate the correct option.

  1. 2n
  2. n
  3. n3
  4. n2
  5. n/2

Correct Answer: D

Explanation:

Average = Sum of observations/number of observations
n = Sum/n
Sum = n*n

Each observation is multiplied by n. Hence, the sum of the observations is equal to the old sum multiplied by n.
New sum = Old sum*n = n*n*n
Average = n*n*n/n=n2
Option D is true.

Question: 7

Which of the following statements is true with respect to the English alphabets? Indicate all correct statements.

  1. 26 single letter words with or without meaning can be formed
  2. 26*26 two-letter words with or without meaning and with distinct letters can be formed
  3. 26*25*24 three-letter words with or without meaning can be formed
  4. 26*25*24*23 four-letter words with or without meaning and with distinct letters can be formed
  5. 26*25*24*23*22 five-letter words with or without meaning can be formed

Correct Answer: A and D

Explanation:

Number of single letter words with or without meaning are=26
Option A is true.
Number of two-letter words with or without meaning and with distinct letters = 26*25
Option B is false.
Number of three-letter words with or without meaning without any condition on repetition = 26*26*26
Option C is false.
Number of four-letter words with or without meaning and with distinct letters = 26*25*24*23
Option D is true.
Number of five-letter words with or without meaning without any condition on repetition = 26*26*26*26*26
Option E is false.

Question 8

While this may be the position on the Pakistan side of the border, the situation in entire Afghanistan continues to be chaotic. A professional Afghan army which the Karzai government was to raise is nowhere near its planned strength, thus encouraging the warlords in their defiance of Kabul. The warlords also refuse to share revenues with Kabul, and often hobnob with the Taliban to blackmail the Karzai government. Both Islamabad and Kabul should know that the issue needs political handling more than resort to force. The two governments should also better coordinate their efforts against Al-Qaeda and the Taliban since the misunderstandings between the two have often enabled the Taliban to exploit these differences to their advantage.

Which sentence makes it apparent that the issue of security has not been given due precedence by the Afghan government?

The correct answer is B. (A professional Afghan … Kabul)

Explanation

The issue of security has been referred to in the entire passage. The correct answer would be the sentence that refers to an aspect which indicates lack of interest in maintaining security in the country. The second sentence brings out that the warlords are defiant due to lack of a professional Afghan army in the required strength. This is one of the reasons for a chaotic situation in Afghanistan. None of the other sentences directly refer to the fact that the issue of security has not been given due importance or precedence. Therefore, B is the correct answer.

Question 9

The present times can see a -------------- and conversion in the neighborhood patterns of the cities and also the internal composition of neighborhoods.

  1. Variance
  2. Switch
  3. Transformation
  4. Stagnation
  5. Transmutation

Correct Answer: A, B, C and E

Explanation

The blank in the sentence has to be filled using a word that adds to the meaning of the word ‘conversion’ that has been used in the second part of the sentence. The words in the list, all except ‘Stagnation’ are suited to its meaning, thus, this is the only wrong answer among the five given options.


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