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Syllogisms Questions and Answers

Important Instructions
71.

In the question given below consists of five or six statements followed by options consisting of three statements put together in a specific order. Choose the option which indicates a valid argument containing logically related statements that is, where the third statement is conclusion drawn from preceding two statements.

A. An eagle lays eggs.
B. All birds lay eggs.
C. Some birds can fly.
D. An eagle cannot fly.
E. An eagle is a bird.
F. An eagle cannot swim.

Answer: B

Correct answer: BEA

Taking B and E as the premises: all birds lay eggs, and an eagle is a bird. It follows that an eagle lays eggs, which is A. The other segments - about flying and swimming - are neither needed nor derivable.

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72.

Statements: All green are blue. All blue are white.

Conclusions:

1. Some blue are green.

2. Some white are green.

3. Some green are not white.

4. All white are blue.

Answer: A

Correct answer: Only (1) and (2)

All green are blue gives some blue are green, conclusion 1; and since all green are blue and all blue are white, all green are white, whence some white are green, conclusion 2. Conclusion 3 contradicts that, and conclusion 4 reverses a universal.

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73.

The question given below has a set of three or four statements. Each set of statements is further divided into three segments. Choose the alternative where the third segment in the statement can be logically deduced using both the preceding two, but not just from one of them.

Statement-

I. No key is door.
II. All doors are pens.
III. Some pens are houses.

Conclusion -

I. No key is house.
II. Some pens are doors.

Answer: B

Correct answer: Only II follows

Conclusion II is simply the converse of the second statement: if all doors are pens then certainly some pens are doors. Conclusion I asks about keys and houses, and the statements link them only through pens - a middle term that is not distributed - so nothing follows there. Only II follows.

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74.

The question given below has a set of three or four statements. Each set of statements is further divided into three segments. Choose the alternative where the third segment in the statement can be logically deduced using both the preceding two, but not just from one of them.

Statement -

I. All fruits are lions
II. All lions are foxes
III. Some foxes are beggars

Conclusion -

I. All fruits are foxes.
II. Some fruits are beggars.

Answer: A

Correct answer: Only I follows

All fruits are lions and all lions are foxes, so all fruits are foxes - conclusion I. Conclusion II asks about beggars, and we know only that some foxes are beggars; those need not be the fruits. Only I follows.

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75.

In the question given below consists of five or six statements followed by options consisting of three statements put together in a specific order. Choose the option which indicates a valid argument containing logically related statements that is, where the third statement is conclusion drawn from preceding two statements.

Statement -

A. Cars are birds.
B. Some birds are ants.
C. Cars are ants.
D. Some Cars are ants.
E. Some Cars are not ants.
F. No car is ant.

Answer: B

Correct answer: ADB

Taking A and D as the premises: cars are birds, and some cars are ants. Those cars are birds and they are ants, so some birds are ants, which is B. The premises must be the first two segments and the conclusion the third, and only this order works.

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76.

Statements:

I. Some rulers are dancers.

II. All dancers are short.

Conclusions:

I. Some rulers are short.

II. All rulers are short.

Answer: A

Correct answer: If only conclusion I follows

Some rulers are dancers and all dancers are short, so those rulers are short - some rulers are short, conclusion I. Conclusion II makes it all rulers, which a particular statement cannot support. Only I follows.

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77.

Statements: All the books are papers. Some papers are journals. Some journals are calendars.

Conclusions:

1. Some journals are books.

2. Some calendars are papers.

3. Some books are journals.

4. Some books are calendars.

Answer: D

Correct answer: None of the four

The chain runs books → papers by a universal, but from papers onward it is all particulars - some papers are journals, some journals are calendars - and those need not be the same papers or journals. None of the four follows.

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78.

The question given below has a set of three or four statements. Each set of statements is further divided into three segments. Choose the alternative where the third segment in the statement can be logically deduced using both the preceding two, but not just from one of them.

Statement -

I. Some guns are hammers.
II. Some hammers are bullets.
III. Some bullets are axes.

Conclusion -

I. Some axes are hammers.
II. Some bullets are guns.
III. Some axes are guns

Answer: D

Correct answer: None follows

All three statements are particular - some guns are hammers, some hammers are bullets, some bullets are axes - and a chain of “some” carries nothing along it. None follows.

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79.

Statements: All the books are pencils. No pencil is eraser.

Conclusions:

1. All the pencils are books.

2. Some erasers are books.

3. No book is eraser.

4. Some books are erasers.

Answer: A

Correct answer: Only (3)

All books are pencils and no pencil is an eraser, so nothing that is a book can be an eraser - no book is an eraser, conclusion 3. Conclusions 2 and 4 assert the opposite, and conclusion 1 reverses a universal.

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80.

Statements:

I. Some students are bad.

II. Some bad are good.

Conclusions:

I. Some students are good.

II. All good are bad.

Answer: D

Correct answer: If neither conclusion I nor II follows

Both statements are particular, and the bad who are students need not be the bad who are good, so nothing links students to good. Conclusion II makes a universal out of a particular. Neither follows.

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