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: Some devils are angels. All social workers are angels

Conclusions:

I. Some devils are social workers.

II. Some social workers are devils

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 I type proposition. So, the intermediate term 'angels' forming the significance is not distributed. The second statement is an A type proposition. So, the intermediate term 'angels' forming the significance is not distributed. Since the intermediate term 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 3 - Statements: Some cold drinks are toxic. Some toxic are hazardous.

Conclusions:

I. All cold drinks are hazardous.

II. No cold drinks are hazardous.

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

We are not sure whether all cold drinks are hazardous is true or no cold drinks are hazardous is true but the chances of occurrence of both the options is equally likely 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 4 - Statements: Most teachers are boys. Some boys are principals.

Conclusions:

I. Some principals are boys.

II. Some teachers are principals.

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 particular, no definite conclusion is valid. However, conclusion I is the opposite of the second statement and thus 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 5 - Statements: All mobiles are roads. All roads are calls.

Conclusions:

I. All calls are mobiles.

II. Some calls are mobiles.

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 roads are calls’ and ‘all mobiles are roads’, we can deduce that ‘some calls are mobiles’ but ‘ all calls are mobiles’ is certainly not on the cards. 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 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 apples are green in colour. No green-coloured things are cheap.

Conclusions:

I. All apples are cheap.

II. Green-colored apples 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 apple is cheap'. Since all apples are green in colour, we may substitute apples with 'golden-colored apples. Thus, 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: 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: All ships are buses. No hotel is bus. All bikes are hotels.

Conclusions:

I. No bike is ship.

II. No bus is bike.

III. No ship is hotel.

Options:

A - I is valid

B - II is valid

C - III is valid

D - All are valid

Answer : D

Explanation

All ships are buses. No hotel is bus.

Since both the statements are broad and one statement is not positive, the conclusion must be broad but not positive (E-type) and should not contain the intermediate term. So, it is valid that 'No train is hotel'. Thus, III is valid. All bikes are hotels. No hotel is bus. As discussed above, it is valid that 'No bike is bus'. II is the opposite of this conclusion and so it holds true. All trains are buses. No bike is bus. Again, it is valid that 'No train is bike'. I is the opposite of this conclusion and so it holds true.

reasoning_logical_deduction.htm
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