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: All beams are rays. All sun are rays.

Conclusions:

I. Some sun are beams.

II. No sun is beams.

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 'rays' is not present even for a single time in the statements, no definite conclusion can be ascertained.

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: All lovers are singers. All film directors are lovers

Conclusions:

I. All film directors are singers.

II. Some lovers are film directors.

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 affirmative, the conclusion must be broad affirmative and should not contain the intermediate term. So, conclusion I is valid. Conclusion II is the opposite of the second statement and so 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 3 - Statements: All markers are chalks. All chairs are chalks.

Conclusions:

I. Some marker are chairs.

II. Some chalks are marker.

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 : B

Explanation

Since the intermediate term 'chalks' is not distributed even once in the statements, no definite conclusion is valid. However, conclusion II is the opposite of the first statement and so it 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 4 - Statements: Some books are pens. No pen is pencil.

Conclusions:

I. Some books are pencils.

II. No book is pencil.

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 : C

Explanation

Only option C is correct. Because either of the options can be correct. Each has equal chance to occur. So, option c 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 5 - Statements: All snakes are trees. All trees are cats.

Conclusions:

I. All snakes are cats.

II. All cats are snakes.

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

Since both the statements are broad and affirmative, the conclusion must be broad and affirmative. II conclusion being affirmative, distributes the term 'cats'.

Since the term 'cats' is distributed in II without being distributed in any of the statements, so conclusion II cannot follow. Thus, only I 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: All plates are bamboo. Some bamboos are balls. No bowl is a ball.

Conclusions:

I. Some bowls are bamboo.

II. No bowl is bamboo.

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 : C

Explanation

From the above statements, it is clear that there are equal chances that some bowls are bamboo and no bowl is bamboo. Hence, option C 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: All bacteria are amoeba. No fish is amoeba. Some amoebas are fungi.

Conclusions:

I. There is possibility that some fishes are amoeba.

II. Some bacteria are fish.

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

Option A is correct because surely there is possibility that some fishes are amoeba. But some bacteria are fish is not possible. 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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