Logical Reasoning Question For SBI PO

Directions (1-5): Do as
directed in each of the following questions.
to Albert Einstein’s famous theory of relativity, time travel is theoretically
possible. Assuming that time travel were to be made possible through some
technological breakthrough, it would be advantageous to send someone back in
time to prevent the assassination of Archduke Franz Ferdinand in 1914 and thus
keep World War I from ever occurring. 

Which of the following assumptions can be
from above argument?

(1) It is not possible to
alter a significant current in world history merely by changing a single event.

(2) The technology
necessary for time travel is likely to be developed in the near future.
(3) If Franz Ferdinand had
not been assassinated, some other catalytic event would have led to the start
of World War I.
(4) The assassination of
Franz Ferdinand was the crucial event that triggered the start of World War I.
(5) None of these
airlines have requested all their passengers to check the status of flight
operations before leaving their homes as heavy fog is causing immense problems
to normal flight operations. 

Which of the following assumption(s) is/are
in the above statement?
(1) The majority of the
air passengers may check the flight status before starting their journey to the
(2) The Govt. may take
serious objection to the notice issued by the airline company.
Majority of the passengers may cancel their tickets and postpone their journey
till the situation becomes normal.
Both (1) and (2)                      
(5) None of these
the film Jurassic Park, scientists
create live dinosaurs by replicating dinosaur DNA found inside an insect that
had bitten a dinosaur and was then trapped in amber. Although such a feat has
not yet been accomplished, one day modern science will probably succeed in
recreating prehistoric creatures in a similar manner.

All of the following
assumptions underlie the conclusion of the passage above EXCEPT

(1) the genetic
information in DNA is sufficient to permit the recreation of an entire animal.
(2) it will someday be
possible to accurately replicate DNA in a laboratory.
(3) enough DNA can be
extracted from an insect to recreate an entire animal.
(4) scientists will never
fully understand how DNA functions.
(5) None of these
A large number of people die every year due
to drinking polluted water during the summer. Which of the following can be an
effective step to solve the above problem?

(A) The government should make adequate arrangements to
provide safe drinking water to all its citizens.
(B) People should consume minimal amount of water during
The people should be educated
about the dangers of drinking polluted water.

(1) Only A            
(2) Only B
(3) Only C
(4) Only A and B  
(5) Only A and C
March 1917, under pressure from communist revolutionaries, Tsar Nicholas II of
Russia abdicated his throne. Sixteen months later, the Tsar and his immediate
family, including Alexis, the heir apparent, were executed on orders of the new
communist government because its leaders believed that all vestiges of the old
regime had to be obliterated for the security of the new regime. 

The leaders of
the new communist government must have made which of the following assumptions?

(1) Executing the Tsar and
his heir would send a clear message to all in Russia concerning the
ruthlessness of the new regime.
(2) If Nicholas or Alexis
had remained alive, he could have provided a rallying point for supporters of
the old regime.
(3) A communist regime
could theoretically be compatible with a government ruled by a Tsar.
(4) The populace of Russia
would be overwhelmingly supportive of the decision to execute the Tsar and his
Both (1) and (2)
questions are based on statement given below and the sentences labeled (A),
(B), (C) and (D) as given below.
The cases of food poisoning due to consumption of liquor in
rural areas are far greater than such cases in urban areas. Hence it can be
concluded that the liquor supplied in rural areas is of low quality than that
supplied in urban areas.

(A) The prices of
liquor are lower in rural areas than in urban areas.
(B) Percentage of people consuming liquor is more in rural
areas than in urban areas.
(C) There are many unauthorized spurious liquor shops in the rural areas.
(D) Number of people suffering from food poisoning due to
consumption of liquor as a percentage of people who consume liquor is almost
equal for both urban areas and rural areas.
6.    Which
of the above statements numbered (B), (C) and (D) if true will most weaken the given argument?
(1) Only D            
(2) Both B and D  
(3) Only C
(4) Only B            
(5) None of these
7.    Which
of the above statements numbered (A), (B), (C) and (D) if true will strengthen the given argument?
(1) Only A            
(2) Only B            
(3) Only C
(4) Both A and D  
(5) A, C and D
The district administration has issued a circular to all the farmers
under its jurisdiction advising them for not using pesticides indiscriminately
as it may pollute the ground water.
Which of the following can be assumed from
the given statement?
(1) People may stop using ground water if the farmers
continue to use pesticides indiscriminately.
(2) The polluted ground water can
cause health problems.
(3) Farmers may refrain from using pesticides
(4) People in the district are
majorly dependent on ground water for drinking use.
(5) None of these
(9 – 10):
questions are based on statement given below and the sentences labeled (A),
(B), (C) and (D) as given below.
number of people diagnosed with dengue fever (which is contracted from the bite
of an infected mosquito) in North India this year is twice the number diagnosed
last year. The authorities have concluded that measures to control the mosquito
population have failed in this region.
(A) An
effective diagnostic test was introduced about nine months ago
(B) The
incidence (number of cases per thousand) of malaria, also contracted from
mosquito bites, has increased
(C) A
very high proportion of the cases were diagnosed in people of neighboring
(D) More
cases are now reported because of increases in administrative efficiency
9.    Which
of the above statements numbered (A), (B), (C) and (D) if true will weaken the given argument?
(1) Only A                        
(2) Only D            
(3) Only C
(4) Both C and D              
(5) Both A and D
10.  Which
of the above statements numbered (A), (B), (C) and (D) if true will most supports the given argument?
(1) Only D            
(2) Only A            
(3) Only C
(4) Only B            
(5) None of these

Solutions (1-10)
1. (4) If (4) is not true we cannot
reach the conclusion stated above.
2. (1) Only (1) is implicit in the given
statement as it is a desired effect.
(2) and (3) are not relevant as they
are neither the root cause nor the desired effect.
3. (4) Choice (4) is not even remotely
related to the passage.
4. (5) (B) is extreme. (A) and (C) are relevant and preventive. Hence both are
effective to solve the problem.
(2) Choice (2)
suggests how Nicholas could have been a threat to the new regime.

6. (2) (A) is irrelevant and (C)
supports the given argument. (B) weakens the argument by saying that since more
people consume liquor in rural areas hence it is normal that the cases of food
poisoning are more in rural areas. Similarly (D) also weakens the argument.

7. (3) Only (C) supports the argument
saying that there are
many unauthorized spurious liquor shops in the rural areas due to which
the low quality liquor
supplied in rural areas.
(3) (1), (2) and (4)
are irrelevant as nothing is mentioned about them.
The district administration has issued
a circular to make the farmers aware of hazards that indiscriminate use of
pesticides poses to ground water and plead them to refrain from the same. Hence
(3) is an assumption in the given statement.
The authorities conclude
that measures to control mosquitoes have failed. (C) is irrelevant in the
present context. (A) weakens the given argument by saying that the increase is
because of the effective test and (D) also weakens the argument by saying that
more cases are registered this year because of
increases in administrative efficiency. However (B) supports the argument saying that as another
mosquito-borne disease is increasing, it is more likely to indicate that
mosquitoes are not controlled.


10. (4)

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