Logical Deduction - General Inteligence & Reasoning MCQ Questions and Answers

31

Statements : All windows are doors. No door is wall.

Conclusions :
I. No window is wall.
II. No wall is door.

A) Only conclusion I follows B) Only conclusion II follows C) Either I or II follows D) Neither I nor II follows E) Both I and II follow

Discuss

Answer & Solution

Answer: Option E

Solution:

Since both the premises are universal and one premise is negative, the conclusion must be universal negative. Also, the conclusion should not contain the middle term. So, I follows. However, II is the converse of the second premise and thus it also holds,

32

Statements : Most teachers are boys. Some boys are students.

Conclusions :
I. Some students are boys.
II. Some teachers are students.

A) Only conclusion I follows B) Only conclusion II follows C) Either I or II follows D) Neither I nor II follows E) Both I and II follow

Discuss

Answer & Solution

Answer: Option A

Solution:

Since both the premises are particular, no definite conclusion follows. However, I is the converse of the second premise and thus it holds.

33

Statements : No man is a donkey. Rahul is a man.

Conclusions :
I. Rahul is not a donkey.
II. All men are not Rahul.

A) Only conclusion I follows B) Only conclusion II follows C) Either I or II follows D) Neither I nor II follows E) Both I and II follow

Discuss

Answer & Solution

Answer: Option A

Solution:

Since on premise is negative, the conclusion must be negative. Conclusion II cannot follow as it contains the middle term. So, only I follows.

34

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

Conclusions :
I. Some books are pencils.
II. No book is pencil.

A) Only conclusion I follows B) Only conclusion II follows C) Either I or II follows D) Neither I nor II follows E) Both I and II follow

Discuss

Answer & Solution

Answer: Option C

Solution:

As discussed above, the conclusion must be particular negative and should not contain the middle term. So, it follows that 'Some books are not pencils'. However, I and II involve only the extreme terms and form a complementary pair. Thus, either I or II follows.

35

Statements : All men are married. Some men are educated.

Conclusions :
I. Some married are educated.
II. Some educated are married.

A) Only conclusion I follows B) Only conclusion II follows C) Either I or II follows D) Neither I nor II follows E) Both I and II follow

Discuss

Answer & Solution

Answer: Option E

Solution:

Since one premise is particular, the conclusion must be particular and should not contain the middle term. So, I follows. II is the converse of I and thus it also holds.

36

Statements : All tubes are handles. All cups are handles.

Conclusions :
I. All cups are tubes.
II. Some handles are not cups.

A) Only conclusion I follows B) Only conclusion II follows C) Either I or II follows D) Neither I nor II follows E) Both I and II follow

Discuss

Answer & Solution

Answer: Option D

Solution:

Both the premises are A type propositions. So, in either, the middle term 'handles' forming the predicate is not distributed. Since the middle term is not distributed even once in the premises, no definite conclusion follows

37

Statements : No magazine is cap. All caps are cameras.

Conclusions :
I. No camera is magazine.
II. Some cameras are magazines.

A) Only conclusion I follows B) Only conclusion II follows C) Either I or II follows D) Neither I nor II follows E) Both I and II follow

Discuss

Answer & Solution

Answer: Option C

Solution:

As discussed above, the conclusion must be particular negative and should not contain the middle term. So, it follows that 'Some cameras are not magazines'. However, I and II involve only the extreme terms and form a complementary pair. Thus, either I or II follows.

38

Statements : All huts are mansions. All mansions are temples.

Conclusions :
I. Some temples are huts.
II. Some temples are mansions.

A) Only conclusion I follows B) Only conclusion II follows C) Either I or II follows D) Neither I nor II follows E) Both I and II follow

Discuss

Answer & Solution

Answer: Option E

Solution:

As discussed above, it follows that 'All huts are temples'. I is the converse of this conclusion and so it holds. II is the converse of the second premise and so it also holds.

39

Statements : Some books are tables. Some tables are mirrors.

Conclusions :
I. Some mirrors are books.
II. No book is mirror.

A) Only conclusion I follows B) Only conclusion II follows C) Either I or II follows D) Neither I nor II follows E) Both I and II follow

Discuss

Answer & Solution

Answer: Option C

Solution:

Let's break down this logical deduction question!

First, let's understand the statements:
* Some books are tables: This means a part of the 'books' group overlaps with the 'tables' group.
* Some tables are mirrors: This means a part of the 'tables' group overlaps with the 'mirrors' group.

Now, let's analyze the conclusions:
* Conclusion I: Some mirrors are books: The statements don't directly link books and mirrors. It's possible, but not guaranteed. There's no direct connection established that *requires* some mirrors to be books.
* Conclusion II: No book is mirror: Again, the statements don't directly link books and mirrors to say definitively that they *cannot* overlap. It's possible there is *no* overlap, but it's not a certainty based on the given information.

Notice that Conclusions I and II are contradictory. They cannot both be true at the same time (either some mirrors *are* books, or *no* mirror is a book). But they *could* both be false (some mirrors might be books, and some might not).

The 'Either...or...' situation arises when we have contradictory conclusions, and there's no definitive information to support either one individually.

Since we cannot definitively say that *either* conclusion I or conclusion II *must* be true, but one of them has to be true given their contradiction, the answer is:

Option C: Either I or II follows

40

Statements : All trucks fly. Some scooters fly.

Conclusions :
I. All trucks are scooters.
II. Some scooters do not fly.

A) Only conclusion I follows B) Only conclusion II follows C) Either I or II follows D) Neither I nor II follows E) Both I and II follow

Discuss

Answer & Solution

Answer: Option D

Solution:

Since the middle term 'fly' is not distributed even once in the premises, no definite conclusion follows.