3.2 Quiz Critical tThinking By Example


1. "The band won't go on stage unless they are paid first." This sentence is logically equivalent to which of the following:

a) If they go on stage, then the band is paid first.
b) If the band is paid first, then they will go on stage.
c) If they don't go on stage, then the band is not paid first.
2. "The band won't go on stage unless they are paid first." According to this sentence being paid first is a __________ condition for going on stage.

a) Necessary
b) Sufficient
c) Necessary and sufficient
d) Neither necessary not sufficient
3. "The band won't go on stage unless they are paid first." According to the previous sentence, not being paid first is a _________condition for not going on.

a) Necessary
b) Sufficient
c) Necessary and sufficient
d) Niether necessary nor sufficient
4. "The band won't go on stage unless they are paid first." According to the previous sentence, going on stage is a _______condition for being paid first.

a) Necessary
b) Sufficient
c) Necessary and sufficient
d) Neither necessary nor sufficient
5. "Only if they are out of chicken, will CarlosI stoop to ordering beef." Accordign to the previous sentence, Carlos ordering chicken is a _______condition for being out of beef.

a) Necessary
b) Sufficient
c) Necessary and sufficient
d) Neither necesary nor sufficient
6. "Only if they are out of chicken, will CarlosI stoop to ordering beef." Accordign to the previous sentence, being out of chicken is a _______condition for Carlos ordering beef. .

a) Necessary
b) Sufficient
c) Necessary and sufficient
d) Neither necessary nor sufficient
7. He drives to work when it rains. According to the previous sentence, his driving to work is a __________condition for it raining

a) Necessary
b) Sufficient
c) Necessary and sufficient
d) Neither necesary nor sufficient
8. He drives to work when it rains. According to the previous sentence, his not driving to work is a __________condition for it not raining

a) Necessary
b) Sufficient
c) Necessary and sufficient
d) Neither necessary nor sufficient
9. He drives to work when it rains. According to the previous sentence, it not raining is a __________condition for him not driving.

a) Necessary
b) Sufficient
c) Necessary and sufficent
d) Neither necessary nor sufficient
10. If you don't come to class, then you won't pass the course. The contrapositive of the previous sentence is

a) If you come to pass you will pass the course.
b) If you don't pas the course, then you didn't go to class.
c) If you pass the course, then you came to class.
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