Free Mensa IQ Critical Thinking Practice Test

Question 1

All roses are flowers. Some flowers fade quickly. Therefore:

Accepted Answer

B. Some roses may fade quickly

Answer

A. All roses fade quickly

Answer

C. No roses fade quickly

Answer

D. All flowers are roses

Question 2

If it is true that 'No X is Y' and 'All Z is X', which must be true?

Accepted Answer

B. No Z is Y

Answer

A. Some Z is Y

Answer

C. All Y is Z

Answer

D. Some X is Z

Question 3

A study shows students who eat breakfast score higher on tests. A teacher concludes breakfast causes better test scores. What flaw exists in this reasoning?

Accepted Answer

B. Correlation does not imply causation

Answer

A. The sample size is too large

Answer

C. The study used too many variables

Answer

D. Test scores are subjective

Question 4

Five people sit in a row. Anna is not at either end. Ben is to the right of Anna. Clara is at the leftmost seat. Dana is between Clara and Anna. Who is at the rightmost seat?

Accepted Answer

C. Eric

Answer

A. Anna

Answer

B. Ben

Answer

D. Dana

Question 5

Which argument contains circular reasoning?

Accepted Answer

B. This book is trustworthy because the author says it is accurate

Answer

A. The sun rises because the earth rotates

Answer

C. Exercise improves health because it strengthens the body

Answer

D. Water boils at 100°C because heat increases molecular energy

Question 6

Three friends each prefer a different sport: football, tennis, or swimming. Alex doesn't like water sports. Blake prefers racket sports. Who likes football?

Accepted Answer

A. Alex

Answer

B. Blake

Answer

C. Charlie

Answer

D. Cannot be determined

Question 7

What is the logical conclusion if: 'All politicians are public figures' and 'Some public figures are dishonest'?

Accepted Answer

C. Some politicians may be dishonest

Answer

A. All politicians are dishonest

Answer

B. Some politicians are public figures

Answer

D. No politicians are dishonest

Question 8

A man is looking at a photograph and says, 'Brothers and sisters I have none, but that man's father is my father's son.' Who is in the photograph?

Accepted Answer

C. The man's son

Answer

A. The man himself

Answer

B. The man's father

Answer

D. The man's nephew

Question 9

Which of the following best identifies the flaw: 'We should not trust John's opinion on the new policy because he dresses oddly.'

Accepted Answer

B. Ad hominem

Answer

A. False dilemma

Answer

C. Straw man

Answer

D. Slippery slope

Question 10

If all Bloops are Razzles and all Razzles are Lazzles, are all Bloops definitely Lazzles?

Accepted Answer

A. Yes

Answer

B. No

Answer

C. Only sometimes

Answer

D. Cannot be determined