GCAT Syllogistic Reasoning 2

Question 1

All doctors are scientists. Some scientists are professors. Which conclusion is valid?

Accepted Answer

No conclusion can be drawn about doctors and professors.

Answer

The link between doctors and professors cannot be established because 'some scientists are professors' does not tell us which scientists.

Question 2

No fish are mammals. All whales are mammals. Which conclusion follows?

Accepted Answer

No whales are fish.

Answer

Since no fish are mammals and all whales are mammals, whales and fish share no members.

Question 3

All A are B. All B are C. No C are D. What can be concluded about A and D?

Accepted Answer

No A are D.

Answer

A is a subset of B, B is a subset of C, and C excludes D entirely, so A cannot be D.

Question 4

Some managers are leaders. All leaders are communicators. Which must be true?

Accepted Answer

Some managers are communicators.

Answer

The managers who are leaders must also be communicators, so at least some managers are communicators.

Question 5

All poets are dreamers. No dreamer is a banker. Which is valid?

Accepted Answer

No poet is a banker.

Answer

Poets are dreamers and dreamers exclude bankers, so poets and bankers cannot overlap.

GCAT - General Cognitive Ability Test Practice Test