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 sticks are drums. Some drums are heavy.

Conclusions:

I. All heavy are either drums or sticks.

II. Some heavy are drums.

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

Option I is not correct because both the statements are particular, so no definite conclusion can be ascertained but II conclusion 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 3 - Statements: Many trams are trucks. All trucks are trains.

Conclusions:

I. Some trams are trains.

II. No truck is a tram.

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 the first statement is particular, conclusion must not contain any middle term. 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 4 - Statements: Some tabs are windows. All windows are laptops.

Conclusions:

I. Some laptops are tabs.

II. All laptops are tabs.

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

Only option A is correct. Because some laptops are tabs but all laptops cannot be tabs. So, 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 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: 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: 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: All lizards are mangoes. Some mangoes are streets. All streets are mountains.

Conclusions:

I. Some mountains are mangoes.

II. Some mountains are lizards.

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 mountains are mangoes is the only possible answer. But some mountains are lizards is not correct. Hence, option A is correct.

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

Q 9 - Statements: Some bags are pockets. No pocket is a packet.

Conclusions:

I. No bag is a packet.

II. Some bags are not pouches.

III. Some pockets are bags.

IV. No pocket is a bag.

Options:

A - I is valid

B - II is valid

C - Both II and III are valid

D - All are valid

Answer : C

Explanation

Since one statement is particular and the other is not positive, the conclusion must be particular but not positive and should not contain the intermediate term. So, II is valid. III is the opposite of the first statement and thus it also holds true.

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

Q 10 - Statements: Some towels are bed sheets. Some pillows are towels. All bed sheets are pillows.

Conclusions:

I. Some towels are pillows.

II. Some pillows are bed sheets.

III. Some bed sheets are towels.

Options:

A - I is valid

B - II is valid

C - III is valid

D - All are valid

Answer : D

Explanation

I is the opposite of the second statement, II is the opposite of the third statement and III is the opposite of the first statement and as such, all three of them follow.


reasoning_logical_deduction.htm

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