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Test: Logical Deductions - 2 - UPSC MCQ


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10 Questions MCQ Test CSAT Preparation - Test: Logical Deductions - 2

Test: Logical Deductions - 2 for UPSC 2024 is part of CSAT Preparation preparation. The Test: Logical Deductions - 2 questions and answers have been prepared according to the UPSC exam syllabus.The Test: Logical Deductions - 2 MCQs are made for UPSC 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Logical Deductions - 2 below.
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Test: Logical Deductions - 2 - Question 1

Direction: In the following question, two statements are given followed by three or four conclusions numbered I, II, III and IV. You have to take the given statements to be true even if they seem to be at variance from the commonly known facts and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts.

Statements: All branches are flowers. All flowers are leaves.

Conclusions:
I. All branches are leaves.
II. All leaves are branches.
III. All flowers are branches.
IV. Some leaves are branches.

Detailed Solution for Test: Logical Deductions - 2 - Question 1

Since both the premises are universal and affirmative, the conclusion must be universal affirmative and should not contain the middle term. So, it follows that 'All branches are leaves'. Thus, I follows. IV is the converse of this conclusion and so it also holds.

Test: Logical Deductions - 2 - Question 2

In each of the following questions two statements followed by four conclusions numbered I, II, III and IV are given, You have to take the two given statements to take true even if they seem to be at variance from commonly known facts. Read all the conclusions and then decide which of the given conclusions logically follows from the statements.

Statements
All branches are flowers.
All flowers are leaves.

Conclusions
I. All branches are leaves.
II. All leaves are branches.
III. All flowers are branches.
IV. Some leaves are branches.

Detailed Solution for Test: Logical Deductions - 2 - Question 2

Solution

The correct option is B Both I and IV follow
Mediate term of the following statement is
All branches are flowers (A - type)
All flowers are leaves (A - type)
A+A→A type
All branches are leaves
(Conclusion I follows)
All branches are leaves
Conversion
Some leaves are branches
(Conclusion IV follows)

Test: Logical Deductions - 2 - Question 3

Direction: In the following question, two statements are given followed by three or four conclusions numbered I, II, III and IV. You have to take the given statements to be true even if they seem to be at variance from the commonly known facts and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts.

Statements: All politicians are honest. All honest are fair.

Conclusions:
I. Some honest are politicians.
II. No honest is politician.
III. Some fair are politicians.
IV. All fair are politicians.

Detailed Solution for Test: Logical Deductions - 2 - Question 3

Clearly, it follows that 'All politicians are fair'. I is the converse of the first premise, while III is the converse of the above conclusion. So, both I and III hold.

Test: Logical Deductions - 2 - Question 4

Direction: In the following question, two statements are given followed by three or four conclusions numbered I, II, III and IV. You have to take the given statements to be true even if they seem to be at variance from the commonly known facts and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts.

Statements: Some clothes are marbles. Some marbles are bags.

Conclusions:
I. No cloth is a bag.
II. All marbles are bags.
III. Some bags are clothes.
IV. No marble is a cloth.

Detailed Solution for Test: Logical Deductions - 2 - Question 4

Since both the premises are particular, no definite conclusion follows. However, I and III involve only the extreme terms and form a complementary pair. Thus, either I or III follows.

Test: Logical Deductions - 2 - Question 5

Direction: In the following question, two statements are given followed by three or four conclusions numbered I, II, III and IV. You have to take the given statements to be true even if they seem to be at variance from the commonly known facts and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts.

Statements: Some tables are TVs. Some TVs are radios.

Conclusions:
I. 
Some tables are radios.
II. Some radios are tables.
III. All radios are TVs.
IV. All TVs are tables.

Detailed Solution for Test: Logical Deductions - 2 - Question 5

Since both the premises are particular, no definite conclusion follows.

Test: Logical Deductions - 2 - Question 6

Direction: In the following question, two statements are given followed by three or four conclusions numbered I, II, III and IV. You have to take the given statements to be true even if they seem to be at variance from the commonly known facts and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts.

Statements: All terrorists are guilty. All terrorists are criminals.

Conclusions:
I. 
Either all criminals are guilty or all guilty are criminals.
II. Some guilty persons are criminals.
III. Generally criminals are guilty.
IV. Crime and guilt go together.

Detailed Solution for Test: Logical Deductions - 2 - Question 6

Since the middle term 'terrorists' is distributed twice in the premises, the conclusion cannot be universal. So, it follows that 'Some guilty persons are criminals'. Thus, II holds.

Test: Logical Deductions - 2 - Question 7

Direction: In the following question, two statements are given followed by three or four conclusions numbered I, II, III and IV. You have to take the given statements to be true even if they seem to be at variance from the commonly known facts and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts.

Statements: Some books are pens. No pen is pencil.

Conclusions:
I. 
Some pens are books.
II. Some pencils are books.
III. Some books are not pencils.
IV. All pencils are books.

Detailed Solution for Test: Logical Deductions - 2 - Question 7

Since one premise is particular and the other negative, the conclusion must be particular negative and should not contain the middle term. Thus, III follows. I is the converse of the first premise and so it also holds.

Test: Logical Deductions - 2 - Question 8

Direction: In the following question, two statements are given followed by three or four conclusions numbered I, II, III and IV. You have to take the given statements to be true even if they seem to be at variance from the commonly known facts and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts.

Statements: Some houses are offices. Some offices are schools.

Conclusions:
I. 
Some schools are houses.
II. Some offices are houses.
III. No house is school.
IV. Some schools are offices.

Detailed Solution for Test: Logical Deductions - 2 - Question 8

Since both the premises are particular, no definite conclusion follows. However, I and III involve only the extreme terms and form a complementary pair. So, either I or III follows. II is the converse of the first premise while IV is the converse of the second premise. Thus, both of them hold.

Test: Logical Deductions - 2 - Question 9

Direction: In the following question, three statements are given followed by four conclusions numbered I, II, III and TV. You have to take the given statements to be true even if they seem to be at variance with commonly known facts and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts.

Statements: All buildings are windows. No toys is building. Some tigers are toys.

Conclusions:
I. 
Some tigers are buildings.
II. Some windows are tigers.
III. All toys are tigers.
IV. Some windows are toys.

Detailed Solution for Test: Logical Deductions - 2 - Question 9

No toy is building. All buildings are windows.

Since the middle term 'buildings' is distributed twice and one premise is negative, the conclusion must be particular negative and should not contain the middle term.

So, it follows that 'Some windows are not toys'.

Some tigers are toys. No toy is building.

Since one premise is particular and the other premise is negative, the conclusion must be particular negative and should not contain the middle term. So, it follows that 'Some tigers are not buildings'.

Test: Logical Deductions - 2 - Question 10

Direction: In the following question, three statements are given followed by four conclusions numbered I, II, III and TV. You have to take the given statements to be true even if they seem to be at variance with commonly known facts and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts.

Statements: Some papers are cats. All cats are bats. No bat is horse.

Conclusions:
I. Some papers are horses.
II. No horse is cat.
III. Some bats are papers.
IV. All papers are bats.

Detailed Solution for Test: Logical Deductions - 2 - Question 10

Some papers are cats. All cats are bats.

Since one premise is particular, the conclusion must be particular and should not contain the middle term. So, it follows that 'Some papers are bats'. III is the converse of this conclusion and so it holds.

All cats are bats. No bat is horse.

Since both the premises are universal and one premise is negative, the conclusion must be universal negative and should not contain the middle term. So, it follows that 'No cat is horse'. II is the converse of this conclusion and so it holds.

Some papers are bats. No bat is horse.

Since one premise is particular and the other negative, the conclusion must be particular negative and should not contain the middle term. So, it follows that 'Some papers are not horses'.

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