4.3 Quiz Validity


1. It is a clear day, for if it is a clear day in Montana you can see forever. And just look: you can see forever.

a) This argument is valid.
b) This argument in invalid.
2. It is a clear day, for if it is a clear day in Montana you can see forever. And just look: you can see forever.
It is a clear day, for if it is a clear day in Montana you can see forever. And just look: you can see forever.


a) The main conclusion is: it is a clear day.
b) The main conclusio is: if it is a clear day you can see forever in Montana.
c) The main conclusion is: you can see forever.
3. He bought blue stained glass windows for the back of his house. I thought he was going to go with clear glass. Clearly I was wrong.

a) This argument is valid
b) This argument is invalid.
4. If God does not exist., then everything is permitted. Since the pure light of reason tells us that God exists, it follows that not everything is permitted.

a) This argument is valid
b) This argument is invalid
5. If God does not exist, then everything is permitted. But even atheists believe that not everything is permitted. The conclusion is obvious: God exists.

a) This argument is valid.
b) Thsi argument is invalid.
6. Jack will fall only if Jill does. Since Jill fell down, Jack will fall down.

a) This argument is valid.
b) This argument is invalid.
7. All ravens are black. This bird is a black, so it is a raven.

a) This argument is valid.
b) This argument is invalid.
8. All non black things are non ravens. This bird is black, so it is raven.

a) This argument is valid.
b) This argument is invalid
9. If people don't get involved in politics, then they don't deserve a good government. But people are involved in politics, so they deserve a good government.

a) This argument is valid
b) This argument is invalid.
10. If people deserve a good government, then people need to get involved in politics. But people are involved in politics, so they deserve a good government.

a) This argument is valid.
b) This argument is invalid.
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