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Worksheets

N5 Validity (S4)

Total questions: 30

Worksheet time: 15mins

Name
Class
Date
1.

P1: All girls are hilarious.

P2: Nobody who is hilarious has hair.

C: No girls have hair.

a)

Valid

b)

Invalid

2.

P1: All teachers work too much.

P2: Nobody who works too much enjoys their job.

C: No teacher enjoys their job.

a)

Invalid

b)

Valid

3.

P1: All people who gossip make people feel bad.

P2: Nobody who makes people feel bad has ever been funny.

C: Nobody who gossips has ever been funny.

a)

Valid

b)

Invalid

4.

P1: All pigs are intelligent creatures.

P2: No intelligent creatures should be eaten.

C: No pigs should be eaten.

a)

Invalid

b)

Valid

5.

P1: All humans are born.

P2: Some who are born will die.

C: Some humans will die.

a)

Invalid

b)

Valid

6.

P1: All people over 90 live in England.

P2: Some people who live in England hate marmite.

C: Some people over 90 hate marmite.

a)

Valid

b)

Invalid

7.

P1: All philosophy students have to study logic.

P2: Some students who study logic will study philosophy at university.

C: Some philosophy students will study philosophy at university.

a)

Valid

b)

Invalid

8.

P1: All vegan food is healthy food.

P2: Some healthy food is really tasty.

C: Some vegan food is really tasty.

a)

Invalid

b)

Valid

9.

P1: All kittens are adorable.

P2: Ebba is adorable.

C: Ebba is a kitten.

a)

Valid

b)

Invalid

10.

P1: All Watson’s kids have good teachers.

P2: Michael has good teachers.

C: Michael is a Watson’s kid.

a)

Valid

b)

Invalid

11.

P1: All people from Bath believe in UFOs.

P2: Ollie believes in UFOs.

C: Ollie is from Bath.

a)

Invalid

b)

Valid

12.

P1: All people who work in the UK pay taxes.

P2: Juan pays taxes.

C: Juan works in the UK.

a)

Valid

b)

Invalid

13.

P1: If we agree to quiz each other on Philosophy, we will both get an A.

P2: We agreed to quiz each other on Philosophy.

C: We will both get an A.

a)

Valid

b)

Invalid

14.

P1: If you go out with me, I will buy you a new hat.

P2: You have agreed to go out with me.

C: I will buy you a new hat.

a)

Valid

b)

Invalid

15.

P1: If I study hard, then I will get an A

P2: I will study hard

C: I will get an A

a)

Valid

b)

Invalid

16.

P1: If there is smoke in this place, there is fire on your face.

P2: There is smoke in this place.

C: There is fire on your face.

a)

Invalid

b)

Valid

17.

P1: If I am in Edinburgh, then I am in Scotland.

P2: I am not in Edinburgh.

C: I am not in Scotland.

a)

Valid

b)

Invalid

18.

P1: If I make a lot of money, then I will be happy.

P2: I won’t make a lot of money.

C: I won’t be happy.

a)

Valid

b)

Invalid

19.

P1: If you’ve seen Games of Thrones, then you hate season 8.

P2: You haven’t seen Game of Thrones.

C: You didn’t hate season 8.

a)

Valid

b)

Invalid

20.

P1: If Bob finds out, then he’ll break up with Sandra.

P2: Bob didn’t find out.

C: Bob will not break up with Sandra.

a)

Valid

b)

Invalid

21.

P1: If I study hard, then I will get an A

P2: I got an A

C: I studied hard

a)

Invalid

b)

Valid

22.

P1: If it’s brown, flush it down.

P2: I flushed it down.

C: Therefore, it was brown.

a)

Invalid

b)

Valid

23.

P1: If taxes are lowered, I will have more money to spend.

P2: I have more money to spend.

C: Taxes must have been lowered.

a)

Valid

b)

Invalid

24.

P1: If she loves her, she’ll marry her

P2: She married her.

C: She loves her.

a)

Invalid

b)

Valid

25.

P1: If people tell lies, then they'll always get what they want.

P2: People do not always get what they want.

C: People don't tell lies.

a)

Valid

b)

Invalid

26.

P1: If I study hard, then I will get an A

P2: I will not get an A

C: I will not study hard

a)

Valid

b)

Invalid

27.

P1: If it is sunny, then I will wear my sunglasses

P2: I will not wear my sunglasses.

C: It is not sunny.

a)

Valid

b)

Invalid

28.

P1: If I am happy, then I smile.

P2: I am not smiling

C: I am not happy.

a)

Invalid

b)

Valid

29.

P1: All people born before 1066 were under 6ft

P2: Some people under 6ft are obsessed with Kant

C: Some people born before 1066 were obsessed with Kant

a)

Valid

b)

Invalid

30.

P1: All cans of peas are past their expiration date.

P2: This soya milk is past its expiration date.

C: This soya milk is a can of peas.

a)

Invalid

b)

Valid