Valid or Invalid Syllogisms

Authored by Catherine McCaw

Social Studies

9th - 12th Grade

Used 89+ times

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10 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:

All dentists are doctors.
Some dentists are women.
Therefore, some women are doctors.

Valid

Invalid

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:

Many patriots are American.
All heroes are patriots.
Therefore, all heroes are American.

Valid

Invalid

Answer explanation

It doesn't say all patriots are American.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:

All birds are animals.
No cats are birds.
Therefore, no cats are animals.

Valid

Invalid

Answer explanation

It doesn't say all animals are birds.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:

No rationalists are empiricists.
Some rationalists are Europeans.
Therefore, some Europeans are not empiricists.

Valid

Invalid

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:

All pigeons are birds.
All pigeons are winged animals.
Therefore, all winged animals are birds.

Valid

Invalid

Answer explanation

(It doesn’t say all winged animals are pigeons)

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:

All ISIS members are terrorists.
Some ISIS members are not based in the Middle East.
Therefore, some based in the Middle East are not terrorists.

Valid

Invalid

Answer explanation

True, but invalid. The conclusion doesn't follow from the premises.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:

Mammals have lungs.
Fish are mammals.
Therefore, fish have lungs.

Valid

Invalid

Answer explanation

Untrue, but valid.

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Valid or Invalid Syllogisms

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:

All dentists are doctors.
Some dentists are women.
Therefore, some women are doctors.

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:

Many patriots are American.
All heroes are patriots.
Therefore, all heroes are American.

It doesn't say all patriots are American.

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:

All birds are animals.
No cats are birds.
Therefore, no cats are animals.

It doesn't say all animals are birds.

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:

No rationalists are empiricists.
Some rationalists are Europeans.
Therefore, some Europeans are not empiricists.

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:

All pigeons are birds.
All pigeons are winged animals.
Therefore, all winged animals are birds.

(It doesn’t say all winged animals are pigeons)

True, but invalid. The conclusion doesn't follow from the premises.

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:

Mammals have lungs.
Fish are mammals.
Therefore, fish have lungs.

Untrue, but valid.

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:

All Italians eat spaghetti.
Giovanni Rossi eats spaghetti.
Therefore Giovanni Rossi is Italian.

It doesn't say only Italians eat spaghetti. Rossi may well be Italian, but the argument is invalid.

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:

Some monks are Tibetans.
All Tibetans meditate.
Therefore some monks meditate.

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:

All Alphas are Betas.
No Gammas are Betas.
Therefore no Gammas are Alphas.

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Valid or Invalid Syllogisms

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises: All dentists are doctors.Some dentists are women.Therefore, some women are doctors.

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:Many patriots are American.All heroes are patriots.Therefore, all heroes are American.

It doesn't say all patriots are American.

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:All birds are animals.No cats are birds.Therefore, no cats are animals.

It doesn't say all animals are birds.

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:No rationalists are empiricists.Some rationalists are Europeans.Therefore, some Europeans are not empiricists.

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:All pigeons are birds.All pigeons are winged animals.Therefore, all winged animals are birds.

(It doesn’t say all winged animals are pigeons)

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:All ISIS members are terrorists.Some ISIS members are not based in the Middle East.Therefore, some based in the Middle East are not terrorists.

True, but invalid. The conclusion doesn't follow from the premises.

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:Mammals have lungs.Fish are mammals.Therefore, fish have lungs.

Untrue, but valid.

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:All Italians eat spaghetti.Giovanni Rossi eats spaghetti.Therefore Giovanni Rossi is Italian.

It doesn't say only Italians eat spaghetti. Rossi may well be Italian, but the argument is invalid.

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:Some monks are Tibetans.All Tibetans meditate. Therefore some monks meditate.

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:All Alphas are Betas. No Gammas are Betas. Therefore no Gammas are Alphas.

Access all questions and much more by creating a free account

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Social Studies

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:

All dentists are doctors.
Some dentists are women.
Therefore, some women are doctors.

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:

Many patriots are American.
All heroes are patriots.
Therefore, all heroes are American.

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:

All birds are animals.
No cats are birds.
Therefore, no cats are animals.

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:

No rationalists are empiricists.
Some rationalists are Europeans.
Therefore, some Europeans are not empiricists.

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:

All pigeons are birds.
All pigeons are winged animals.
Therefore, all winged animals are birds.

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:

Mammals have lungs.
Fish are mammals.
Therefore, fish have lungs.

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:

All Italians eat spaghetti.
Giovanni Rossi eats spaghetti.
Therefore Giovanni Rossi is Italian.

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:

Some monks are Tibetans.
All Tibetans meditate.
Therefore some monks meditate.

Is this syllogism valid or invalid? Remember: it doesn't have to be true to be valid. Valid means that the conclusion necessarily follows from the premises:

All Alphas are Betas.
No Gammas are Betas.
Therefore no Gammas are Alphas.