# Logical Validity and Invalidity MCQs with Answers

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## Logical Validity and Invalidity Online MCQs with Answers

A valid argument is one where:
a) The conclusion is true
b) The premises are true
c) The conclusion follows logically from the premises
d) The premises and conclusion are unrelated

c) The conclusion follows logically from the premises

An invalid argument is one where:
a) The conclusion is false
b) The premises are false
c) The conclusion does not follow logically from the premises
d) The premises and conclusion are unrelated

c) The conclusion does not follow logically from the premises

Which of the following statements is true?
a) All valid arguments have true premises
b) All invalid arguments have false premises
c) All valid arguments have true conclusions
d) All invalid arguments have false conclusions

b) All invalid arguments have false premises

In a valid argument, if the premises are true:
a) The conclusion must be true
b) The conclusion is likely to be true
c) The conclusion may or may not be true
d) The conclusion is false

c) The conclusion may or may not be true

In an invalid argument, if the premises are true:
a) The conclusion must be true
b) The conclusion is likely to be true
c) The conclusion may or may not be true
d) The conclusion is false

c) The conclusion may or may not be true

A valid argument can have:
a) False premises and a true conclusion
b) True premises and a false conclusion
c) False premises and a false conclusion
d) True premises and a true conclusion

a) False premises and a true conclusion

An argument is valid if:
a) It is persuasive
b) It is based on personal opinions
c) The conclusion follows logically from the premises
d) The premises are true

c) The conclusion follows logically from the premises

An argument is invalid if:
a) It is persuasive
b) It is based on personal opinions
c) The conclusion follows logically from the premises
d) The premises are true

c) The conclusion does not follow logically from the premises

If an argument is valid, which of the following statements is true?
a) The conclusion is necessarily true
b) The premises are necessarily true
c) The conclusion is probably true
d) The premises are probably true

a) The conclusion is necessarily true

If an argument is invalid, which of the following statements is true?
a) The conclusion is necessarily false
b) The premises are necessarily false
c) The conclusion is probably false
d) The premises are probably false

c) The conclusion is probably false

Which of the following arguments is valid?
a) If it is raining, then the ground is wet. The ground is wet. Therefore, it is raining.
b) If it is raining, then the ground is wet. It is not raining. Therefore, the ground is not wet.
c) If it is raining, then the ground is wet. The ground is wet. Therefore, it is not raining.
d) If it is raining, then the ground is wet. The ground is not wet. Therefore, it is not raining.

a) If it is raining, then the ground is wet. The ground is wet. Therefore, it is raining.

Which of the following arguments is invalid?
a) All cats are mammals. Fluffy is a mammal. Therefore, Fluffy is a cat.
b) All birds can fly. Penguins are birds. Therefore, penguins can fly.
c) All squares have four sides. This shape has four sides. Therefore, this shape is a square.
d) All dogs have fur. Fido has fur. Therefore, Fido is a dog.

c) All squares have four sides. This shape has four sides. Therefore, this shape is a square.

If an argument is valid, which of the following statements is true?
a) The conclusion is necessarily true
b) The premises are necessarily true
c) The conclusion is probably true
d) The premises are probably true

a) The conclusion is necessarily true

If an argument is invalid, which of the following statements is true?
a) The conclusion is necessarily false
b) The premises are necessarily false
c) The conclusion is probably false
d) The premises are probably false

c) The conclusion is probably false

A valid deductive argument is one in which:
a) The premises provide strong evidence for the conclusion
b) The conclusion is true
c) The conclusion follows logically from the premises
d) The premises and conclusion are unrelated

c) The conclusion follows logically from the premises

An invalid deductive argument is one in which:
a) The premises provide strong evidence for the conclusion
b) The conclusion is true
c) The conclusion does not follow logically from the premises
d) The premises and conclusion are unrelated

c) The conclusion does not follow logically from the premises

Which of the following arguments is valid?
a) All dogs have tails. Fido is a dog. Therefore, Fido has a tail.
b) All cats have fur. Fluffy has fur. Therefore, Fluffy is a cat.
c) All birds can fly. Penguins are birds. Therefore, penguins can fly.
d) All squares have four sides. This shape has four sides. Therefore, this shape is a square.

a) All dogs have tails. Fido is a dog. Therefore, Fido has a tail.

Which of the following arguments is invalid?
a) All humans are mortal. Socrates is mortal. Therefore, Socrates is human.
b) All cats have tails. Fluffy has a tail. Therefore, Fluffy is a cat.
c) All birds can fly. Penguins are birds. Therefore, penguins can fly.
d) All squares have four sides. This shape has four sides. Therefore, this shape is a square.

a) All humans are mortal. Socrates is mortal. Therefore, Socrates is human.

a) Can have false premises and a false conclusion
b) Can have false premises and a true conclusion
c) Can have true premises and a false conclusion
d) Can have true premises and a true conclusion

d) Can have true premises and a true conclusion

A logically invalid argument:
a) Can have false premises and a false conclusion
b) Can have false premises and a true conclusion
c) Can have true premises and a false conclusion
d) Can have true premises and a true conclusion

c) Can have true premises and a false conclusion

If an argument is valid, which of the following statements is true?
a) The conclusion is necessarily true
b) The premises are necessarily true
c) The conclusion is probably true
d) The premises are probably true

a) The conclusion is necessarily true

If an argument is invalid, which of the following statements is true?
a) The conclusion is necessarily false
b) The premises are necessarily false
c) The conclusion is probably false
d) The premises are probably false

c) The conclusion is probably false

A valid argument guarantees that:
a) The conclusion is true
b) The premises are true
c) The conclusion is likely to be true
d) The premises and conclusion are unrelated

c) The conclusion is likely to be true

An invalid argument guarantees that:
a) The conclusion is false
b) The premises are false
c) The conclusion is likely to be false
d) The premises and conclusion are unrelated

c) The conclusion is likely to be false

A logically valid argument:
a) Is always true
b) Is always false
c) Can have true or false premises and a true conclusion
d) Can have true or false premises and a false conclusion

c) Can have true or false premises and a true conclusion

A logically invalid argument:
a) Is always true
b) Is always false
c) Can have true or false premises and a true conclusion
d) Can have true or false premises and a false conclusion

d) Can have true or false premises and a false conclusion

A valid argument is one that:
a) Is persuasive and convincing
b) Is based on personal opinions and beliefs
c) Follows the rules of logic
d) Reflects bias and prejudice

c) Follows the rules of logic

An invalid argument is one that:
a) Is persuasive and convincing
b) Is based on personal opinions and beliefs
c) Follows the rules of logic
d) Reflects bias and prejudice

b) Is based on personal opinions and beliefs

Which of the following arguments is valid?
a) All cats have tails. Fluffy is a cat. Therefore, Fluffy has a tail.
b) All birds can fly. Penguins are birds. Therefore, penguins can fly.
c) All dogs have fur. Fido has fur. Therefore, Fido is a dog.
d) All squares have four sides. This shape has four sides. Therefore, this shape is a square.

b) All birds can fly. Penguins are birds. Therefore, penguins can fly.

Which of the following arguments is invalid?
a) All dogs have tails. Fido is a dog. Therefore, Fido has a tail.
b) All birds can fly. Penguins are birds. Therefore, penguins can fly.
c) All cats have tails. Fluffy is a cat. Therefore, Fluffy has a tail.
d) All squares have four sides. This shape has four sides. Therefore, this shape is a square.

c) All cats have tails. Fluffy is a cat. Therefore, Fluffy has a tail.

If an argument is valid, which of the following statements is true?
a) The conclusion is necessarily true
b) The premises are necessarily true
c) The conclusion is probably true
d) The premises are probably true

a) The conclusion is necessarily true

If an argument is invalid, which of the following statements is true?
a) The conclusion is necessarily false
b) The premises are necessarily false
c) The conclusion is probably false
d) The premises are probably false

c) The conclusion is probably false

A logically valid argument:
a) Can have false premises and a false conclusion
b) Can have false premises and a true conclusion
c) Can have true premises and a false conclusion
d) Can have true premises and a true conclusion

d) Can have true premises and a true conclusion

A logically invalid argument:
a) Can have false premises and a false conclusion
b) Can have false premises and a true conclusion
c) Can have true premises and a false conclusion
d) Can have true premises and a true conclusion

c) Can have true premises and a false conclusion

If an argument is valid, which of the following statements is true?
a) The conclusion is necessarily true
b) The premises are necessarily true
c) The conclusion is probably true
d) The premises are probably true

a) The conclusion is necessarily true

If an argument is invalid, which of the following statements is true?
a) The conclusion is necessarily false
b) The premises are necessarily false
c) The conclusion is probably false
d) The premises are probably false

c) The conclusion is probably false

A valid argument guarantees that:
a) The conclusion is true
b) The premises are true
c) The conclusion is likely to be true
d) The premises and conclusion are unrelated

c) The conclusion is likely to be true

An invalid argument guarantees that:
a) The conclusion is false
b) The premises are false
c) The conclusion is likely to be false
d) The premises and conclusion are unrelated

c) The conclusion is likely to be false

A logically valid argument:
a) Is always true
b) Is always false
c) Can have true or false premises and a true conclusion
d) Can have true or false premises and a false conclusion