Consider the following knowledge base

represented as a set of Prolog facts:

age(harry,13).
age(draco,14).
age(ron,13).
age(hermione,13).
age(dumbledore,60).
age(hagrid,30).

Which of the following queries return in a single answer

all

the age numbers recorded in the knowledge base? (A solution which returns duplicates is equally acceptable with one that does not).

Consider the following program:

likes(marie, pizza).
likes(marco, pizza).
likes(Person, pizza) :- italian(Person).
italian(marco).

What would the output of the following

query be?

?- setof(Person, likes(Person, pizza), Persons).

Consider the following Prolog program:

all_0s([ ]).

all_0s([0|Tail]) :- all_0s(Tail).

We query the above program with the

following goal:

                          ?-

all_0s([0, 0,

1, 0]). 

Which of the following is not

a

valid constant in Prolog?

Which of the following pairs of terms can unify?

A) cd(29, beatles, sgt_pepper).

     cd(A,B, help).

B) f(foo, _).

     f(A1, bar).

Choose all the queries that will not

succeed.

Consider the following program:

likes(marie, pizza).
likes(marco, pizza).
likes(Person, pizza) :- italian(Person).
italian(marco).

What would the output of the following

query be?

?- findall(Person, likes(Person, pizza), Persons).

If the query below is executed in Prolog:

?- [X|L] = [1,2,3,4,5].

which of the following instantiations correspond

to the right answer?

Which of the following programs represent

the specification:

Consider the following Prolog program:

teaches(chris, history).
teaches(chris, english).
teaches(chris, drama).
teaches(maria, physics).               
studies(alice, english).
studies(jake, english).
studies(emily, drama).
studies(alex, physics).

What is an expected output of the query

below, which uses a cut (!)?

?- teaches(chris, Course), !, studies(Student, Course).