Mensa IQ Test Mensa IQ Syllogisms and Logical Arguments 4

Question 1

All writers are readers. No readers are illiterate. Therefore:

Accepted Answer

No writers are illiterate

Answer

All W→R and No R→I (Celarent) → No W→I.

Question 2

Argument: 'You should agree with me because everyone in our town does.' This is which fallacy?

Accepted Answer

Ad populum (appeal to the crowd)

Answer

Appealing to popular opinion as proof of truth is the ad populum fallacy.

Question 3

Premise: If P then Q. Premise: P is true. What can we conclude?

Accepted Answer

Q is true

Answer

Modus ponens: P→Q; P → Q.

Question 4

No herbivores eat meat. Cows are herbivores. Zebras are herbivores. Which MUST be true?

Accepted Answer

Neither cows nor zebras eat meat

Answer

Both are herbivores, and no herbivore eats meat → neither cows nor zebras eat meat.

Question 5

'Since we allow people to drive at 16, we should allow them to vote at 16.' This argument uses:

Accepted Answer

Argument from analogy

Answer

It draws a parallel between two activities at the same age — an argument by analogy.

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