Logical Deduction Online Quiz


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Following quiz provides Multiple Choice Questions (MCQs) related to Logical Deduction. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.

Questions and Answers

The following question, two or three statements are given and after that two conclusions are provided. You have to take the statements to be true though it shows difference from the known facts. At first, read the statements and then go to the conclusions. Among the conclusions, decide which is logically correct and answer the question by choosing the options provided.

Q 1 - Statements: Some kangaroos are chimpanzees. No chimpanzee is Dinosaur.

Conclusions:

I. All kangaroos are chimpanzees.

II. Some dinosaurs are kangaroos.

Options:

A - Only conclusion I is correct.

B - Only conclusion II is correct.

C - Either I or II is correct.

D - Neither I nor II is correct.

E - Both I and II are correct.

Answer : D

Explanation

None of the conclusions is true. Hence, option D is correct.

The following question, two or three statements are given and after that two conclusions are provided. You have to take the statements to be true though it shows difference from the known facts. At first, read the statements and then go to the conclusions. Among the conclusions, decide which is logically correct and answer the question by choosing the options provided.

Q 2 - Statements: No man is beggar. All men are rich.

Conclusions:

I. No beggar man is rich.

II. No rich man is beggar.

Options:

A - Only conclusion I is correct.

B - Only conclusion II is correct.

C - Either I or II is correct.

D - Neither I nor II is correct.

E - Both I and II are correct.

Answer : D

Explanation

The first statement is an E-type proposition, so, the intermediate term 'man' forming the subject is distributed. The second statement is an A-type proposition. So, the intermediate term 'men' forming the subject is distributed. Since the intermediate term is distributed twice, the conclusion cannot be broad. Since one statement is not positive, the conclusion must not be positive. Thus, it is valid that 'Some rich men are not beggar'. Thus, none of the conclusions is valid.

The following question, two or three statements are given and after that two conclusions are provided. You have to take the statements to be true though it shows difference from the known facts. At first, read the statements and then go to the conclusions. Among the conclusions, decide which is logically correct and answer the question by choosing the options provided.

Q 3 - Statements: All poles are pillars. Some boats are not poles.

Conclusions:

I. All pillars are boats.

II. Some boats are not pillars.

Options:

A - Only conclusion I is correct.

B - Only conclusion II is correct.

C - Either I or II is correct.

D - Neither I nor II is correct.

E - Both I and II are correct.

Answer : D

Explanation

Clearly, the term 'pillars' is distributed in both the conclusions without being distributed in any of the statements. So, none of the conclusions is valid.

The following question, two or three statements are given and after that two conclusions are provided. You have to take the statements to be true though it shows difference from the known facts. At first, read the statements and then go to the conclusions. Among the conclusions, decide which is logically correct and answer the question by choosing the options provided.

Q 4 - Statements: All windows are panes. No pane is wall.

Conclusions:

I. No window is wall.

II. No wall is pane.

Options:

A - Only conclusion I is correct.

B - Only conclusion II is correct.

C - Either I or II is correct.

D - Neither I nor II is correct.

E - Both I and II are correct.

Answer : E

Explanation

Since both the statements are broad and one statement is not positive, the conclusion must be broad but not positive. Also, the conclusion should not contain the intermediate term. So, I is valid. However, conclusion II is the opposite of the second statement and thus it also holds true.

The following question, two or three statements are given and after that two conclusions are provided. You have to take the statements to be true though it shows difference from the known facts. At first, read the statements and then go to the conclusions. Among the conclusions, decide which is logically correct and answer the question by choosing the options provided.

Q 5 - Statements: All boys are smokers. Some smokers are lovers.

Conclusions:

I. All smokers are boys.

II. Some lovers are not smokers.

Options:

A - Only conclusion I is correct.

B - Only conclusion II is correct.

C - Either I or II is correct.

D - Neither I nor II is correct.

E - Both I and II are correct.

Answer : D

Explanation

Since the intermediate term 'smokers' is not distributed even once in the statements, no definite conclusion is valid.

The following question, two or three statements are given and after that two conclusions are provided. You have to take the statements to be true though it shows difference from the known facts. At first, read the statements and then go to the conclusions. Among the conclusions, decide which is logically correct and answer the question by choosing the options provided.

Q 6 - Statements: Some books are pens. Some pens are erasers.

Conclusions:

I. All books are erasers.

II. Some erasers are books.

Options:

A - Only conclusion I is correct.

B - Only conclusion II is correct.

C - Either I or II is correct.

D - Neither I nor II is correct.

E - Both I and II are correct.

Answer : D

Explanation

Since both the statements are particular, so no definite conclusion is valid.

The following question, two or three statements are given and after that two conclusions are provided. You have to take the statements to be true though it shows difference from the known facts. At first, read the statements and then go to the conclusions. Among the conclusions, decide which is logically correct and answer the question by choosing the options provided.

Q 7 - Statements: Some bananas are trees. All trees are pens. All pens are boats.

Conclusions:

I. Some boats are bananas.

II. Some pens are bananas.

Options:

A - Only conclusion I is correct.

B - Only conclusion II is correct.

C - Either I or II is correct.

D - Neither I nor II is correct.

E - Both I and II are correct.

Answer : E

Explanation

Both conclusion I and II follow. Hence, option E is correct.

The following question, two or three statements are given and after that two conclusions are provided. You have to take the statements to be true though it shows difference from the known facts. At first, read the statements and then go to the conclusions. Among the conclusions, decide which is logically correct and answer the question by choosing the options provided.

Q 8 - Statements: Some books are ants. Some ants are pillows. No dog is pillow.

Conclusions:

I. There is possibility that some dogs are ants.

II. Some dogs are definitely books.

Options:

A - Only conclusion I is correct.

B - Only conclusion II is correct.

C - Either I or II is correct.

D - Neither I nor II is correct.

E - Both I and II are correct.

Answer : A

Explanation

Surely there is possibility that some dogs are ants. But we cannot say that some dogs are definitely books. Hence, option A is correct.

The following question are given with some conclusions. Choose the options that logically follow the most.

Q 9 - Statements: All heroes are brave. All braves are fair.

Conclusions:

I. Some braves are heroes.

II. No braves is heroes.

III. Some fair are heroes.

IV. All fair are heroes.

Options:

A - I is valid

B - III is valid

C - Both I and III are valid

D - None are valid

Answer : C

Explanation

Clearly, it is valid that 'All heroes are fair'. I is the opposite of the first statement, while III is the opposite of II statement. So, both I and III holds true.

The following question are given with some conclusions. Choose the options that logically follow the most.

Q 10 - Statements: Some sumps are caps. All caps are bats. Some tigers are caps.

Conclusions:

I. Some bats are tigers.

II. Some sumps are bats.

III. All bats are caps.

Options:

A - I is valid

B - II is valid

C - III is valid

D - I and II are valid

Answer : D

Explanation

Some saints are caps. All caps are bats.

Since one statement is particular, the conclusion must be particular and should not contain the intermediate term. So, it is valid that 'Some sumps are bats'. Thus, II is valid. Some tigers are caps. All caps are bats. So, it is valid that 'Some tigers are bats'. I is the opposite of this conclusion and so it holds true.


reasoning_logical_deduction.htm

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