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Logical Deduction Online Quiz
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.
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: Every boy is a student. Every student is inexperienced.
Conclusions:
I. Every boy is inexperienced.
II. Some inexperienced are students.
Options:
A - Only conclusion I is correct.
B - Only conclusion II is correct.
C - Either I or II is correct.
Answer : E
Explanation
'Every' is equivalent to 'All'. Since both the statements are broad and affirmative, the conclusion must be broad and affirmative and should not contain the intermediate term. So, conclusion I is valid. 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 2 - Statements: Some swords are plastic. All swords are rusty.
Conclusions:
I. Some rusty things are plastic.
II. Some rusty things are not plastic.
Options:
A - Only conclusion I is correct.
B - Only conclusion II is correct.
C - Either I or II is correct.
Answer : A
Explanation
Since one statement is particular, conclusion must not contain any middle term. So, I is valid. Since both the statements are affirmative, conclusions cannot be negative. Thus, II does not 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 3 - Statements: All poles are pillars. Some boats are not poles.
Conclusions:
I. All pillars are boats.
II. Some boats are not pillars.
Options:
A - Only conclusion I is correct.
B - Only conclusion II is correct.
C - Either I or II is correct.
Answer : D
Explanation
Clearly, the term 'pillars' is distributed in both the conclusions without being distributed in any of the statements. So, none of the conclusions 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 books are bibles. Some bibles are mirrors.
Conclusions:
I. Some mirrors are books.
II. No book is mirror.
Options:
A - Only conclusion I is correct.
B - Only conclusion II is correct.
C - Either I or II is correct.
Answer : C
Explanation
Both the statements are particular so no definite conclusion is valid. Here occurrence of both the conclusions is equally likely. Thus, either I or 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 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.
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 women are mothers. All mothers are sisters.
Conclusions:
I. All women are sisters.
II. Some women are not sisters.
Options:
A - Only conclusion I is correct.
B - Only conclusion II is correct.
C - Either I or II is correct.
Answer : A
Explanation
As all women are mothers and all mothers are sisters then we can directly infer that all women are sisters. Hence, conclusion I is correct. But conclusion II is not correct. Hence, option A is the answer.
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 dolls are mirrors. All bottles are mirrors. All bikes are bottles.
Conclusions:
I. All bikes are mirrors.
II. Some mirrors are bikes.
Options:
A - Only conclusion I is correct.
B - Only conclusion II is correct.
C - Either I or II is correct.
Answer : E
Explanation
Both conclusion I and II are true. Hence, option E is chosen.
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 books are ants. Some ants are pillows. No dog is pillow.
Conclusions:
I. There is possibility that some dogs are ants.
II. Some dogs are definitely books.
Options:
A - Only conclusion I is correct.
B - Only conclusion II is correct.
C - Either I or II is correct.
Answer : A
Explanation
Surely there is possibility that some dogs are ants. But we cannot say that some dogs are definitely books. 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 greens are ripe. All ripe are mango.
Conclusions:
I. All greens are definitely mango.
II. There is a possibility that all mangoes are green.
Options:
A - Only conclusion I is correct.
B - Only conclusion II is correct.
C - Either I or II is correct.
Answer : E
Explanation
Both the conclusions are true. As all greens are ripe and all ripe are mango, hence, all green are definitely mango. Conclusion II also holds true. This is because there is a clear possibility that all mangoes are green.
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:
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.