Mensa Mensa IQ Deductive Reasoning Puzzles 4

Question 1

If all geniuses are curious and some curious people are lazy, what must be true?

Accepted Answer

No valid conclusion about geniuses

Answer

The lazy curious people need not include any geniuses, so nothing certain follows about geniuses.

Question 2

A woman points to a photo and says, 'That boy's mother is my mother's only daughter.' Who is the boy to her?

Accepted Answer

Her son

Answer

The speaker is her mother's only daughter, so the boy's mother is herself, making the boy her son.

Question 3

All metals conduct electricity. Copper is a metal. Therefore:

Accepted Answer

Copper conducts electricity

Answer

Copper is a metal and all metals conduct, so copper conducts electricity.

Question 4

In a code, 'MENSA' is written as 'NFOTB'. How is 'IQ' written?

Accepted Answer

JR

Answer

Each letter shifts forward by one, so I becomes J and Q becomes R, giving 'JR'.

Question 5

Some doctors are surgeons. All surgeons are skilled. Some skilled people are tired. Which is valid?

Accepted Answer

Some doctors are skilled

Answer

The doctors who are surgeons must be skilled, so some doctors are skilled.

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