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 oceans are waters. Some waters are boats.

Conclusions:

I. Some boats are oceans.

II. All waters are boats

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

We cannot say that some boats are oceans and also all waters cannot be boats, hence, neither of the options is valid. 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: All fishes are thick in size. Some fishes are heavy.

Conclusions:

I. All sharks are thick in size.

II. All dolphins are not thick in size

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 one statement is particular, the conclusion must be also same and should be free from any intermediate term. So, it is valid that 'Some sharks are thick in size'. I is a cumulative result of this conclusion and the first statement. Thus, only I 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: Some papers are pens. Some pencils are pens.

Conclusions:

I. Some pens are pencils.

II. Some pens are papers.

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 statements are particular, no definite conclusion is valid. However, conclusion I is the opposite of second statement, while conclusion II is the opposite of the first statement. So, both of them hold 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: 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 cars are cows. All fans are cows.

Conclusions:

I. All cars are fans.

II. Some fans are cars.

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 'cars' 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 boats are pilgrims. All pilgrims are pious.

Conclusions:

I. All pious are pilgrims.

II. Some boats are pious.

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

From the statement ‘all pilgrims are pious’ and ‘some boats are pilgrims’ we can get that ‘some boats are pious definitely’. So conclusion II is definitely true. But conclusion I is not true. Hence, option B.

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 mangoes are shiny. No shiny things are cheap.

Conclusions:

I. All mangoes are cheap.

II. Shiny mangoes are not cheap.

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

Clearly, the conclusion must be broad but not positive and should not contain the intermediate term. So, it is valid that 'No mango is cheap'. Since all mangoes are shiny, we may substitute 'mangoes' with shiny mangoes'. Thus, conclusion II 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 8 - Statements: Some blankets are covers. All covers are papers. All papers are bags.

Conclusions:

I. Some bags are blankets.

II. Some papers are blankets.

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 the conclusions are correct in this regard. 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 9 - Statements: Some rubbers are windows. Some windows are pencils. All pencils are boxes.

Conclusions:

I. Some windows are boxes.

II. Some rubbers are boxes.

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

Some rubbers are boxes is not possible. We cannot say forcefully that some rubbers are boxes but some windows are boxes because some windows are pencils and all pencils are boxes. Hence, option A is correct.

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

Q 10 - Statements: Some computers are TVs. Some TVs are radios.

Conclusions:

I. Some computers are radios.

II. Some radios are computers.

III. All radios are TVs.

IV. All TVs are computers.

Options:

A - I is valid

B - II is valid

C - Both I or II are valid

D - None of the above is valid

Answer : D

Explanation

None of the above conclusions are having mere possibilities of becoming true. Hence, option D is correct.


reasoning_logical_deduction.htm

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