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 hard workers win. All hard workers eat well.

Conclusions:

I. All those who eat well are hard workers.

II. All those who win eat well.

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 get to any conclusion. All those who eat well are hard workers and all those who win eat well cannot be 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 3 - Statements: Businessman marries only intelligent girls. Tosa is very intelligent.

Conclusions:

I. Tosa will marry a bureaucrat.

II. Tosa will not marry a bureaucrat.

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

The data does not mention whether all intelligent girls are married to Businessman. So, either I or II may follow.

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 Pepsi are tasty. All tasty are healthy.

Conclusions:

I. Some healthy are Pepsi.

II. Some healthy are tasty.

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 options are correct. So, 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 5 - Statements: All boys are honest. Dravid is honest.

Conclusions:

I. Dravid is a boy.

II. All honest persons are boys.

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 can neither conclude that ‘Dravid is a boy’ nor ‘all honest persons are boys’. 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 6 - Statements: All bandages are garlic. All garlic are cakes.

Conclusions:

I. All cakes are bandages.

II. Some cakes are bandages.

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

All cakes cannot be bandages if we look at the statements. But some cakes are definitely bandages. Hence, option B 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 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: 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, 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: All shoes are black. No black things are cheap.

Conclusions:

I. All shoes are cheap.

II. Black shoes 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 shoes is cheap'. Since all shoes are black, we may substitute 'shoes' with black shoes'. Thus, II is valid.

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

Q 10 - Statements: Some canals are streams. Some streams are deserts. All deserts are roads.

Conclusions:

I. Some roads are streams.

II. Some roads are canals.

III. Some deserts are canals.

Options:

A - I is valid

B - II is valid

C - III is valid

D - All are valid

Answer : B

Explanation

Some canals are streams. Some streams are deserts. Since both the statements are particular, no definite conclusion is valid. Some streams are deserts. All deserts are roads. Conclusion II is particular because of sentence.

reasoning_logical_deduction.htm
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