Mensa IQ Test Mensa IQ Deductive Reasoning Puzzles Questions and Answers 2

Question 1

All doctors are professionals. No criminals are professionals. Therefore:

Accepted Answer

No doctors are criminals

Answer

All doctors are professionals; no criminals are professionals — therefore no doctors can be criminals.

Question 2

If it is raining, I carry an umbrella. I am carrying an umbrella. Therefore:

Accepted Answer

It might or might not be raining

Answer

Carrying an umbrella doesn't prove it's raining — you may carry it for other reasons. This is the logical fallacy of affirming the consequent.

Question 3

In a village, the barber shaves all those, and only those, who do not shave themselves. Who shaves the barber?

Accepted Answer

The barber cannot logically exist

Answer

This is Russell's Paradox — if the barber shaves himself, he shouldn't; if he doesn't, he must. The barber cannot logically exist.

Question 4

Four cards show: 3, 8, RED, BLUE. Rule: 'If a card has an even number, the other side is red.' Which cards must you turn over to test the rule?

Accepted Answer

8 and BLUE

Answer

You must check: 8 (to see if it's red) and BLUE (to ensure it doesn't hide an even number). This is the Wason selection task.

Question 5

Three boxes are labeled 'APPLES', 'ORANGES', and 'MIXED'. All labels are wrong. You draw from the 'MIXED' box and get an apple. What does the 'APPLES' box contain?

Accepted Answer

Oranges

Answer

The 'MIXED' box is actually APPLES. The 'APPLES' box can't have apples, so it must have ORANGES.

Mensa Practice Test Practice Test

Mensa Practice Test Practice Test

Mensa IQ Test Mensa IQ Deductive Reasoning Puzzles Questions and Answers 2