This set of LISP Multiple Choice Questions & Answers (MCQs) focuses on “Predicates – 1”.
1. What is a procedure that returns a value that signals true or false?
a) List
b) Predicates
c) Data
d) None of the mentioned
View Answer
Explanation: A predicate is a procedure that returns a value that signals true or false.
2. Which primitive tests two arguments to see if their values are the same expression?
a) Equal
b) Eql
c) Eq
d) =
View Answer
Explanation: Equal primitive tests two arguments to see if their values are the same expression. It works on atoms and lists.
3. Which predicate tests to see if its first argument is an element of its second argument?
a) EQ
b) =
c) MEMBER
d) None of the mentioned
View Answer
Explanation: MEMBER will return what is left of the list when the matching symbol is encountered.
4. What is meant by keyword argument?
a) Arguments that follows a keyword
b) Lists
c) Data
d) Procedure
View Answer
Explanation: It is used to modify a procedure’s basic behaviour along the line.
5. Which is used to produce a procedure object from a procedure name?
a) EQ
b) #
c) EQUAL
d) None of the mentioned
View Answer
Explanation: From procedure name to produce procedure object # is used always.
6. What is the output of the given statement?
span class="sy0"> * (equal (+ 2 2) 3)
a) T
b) NIL
c) F
d) Both NIL & F
View Answer
Explanation: As 4 is not equal 3, it is printing NIL.
Output:
NIL
7. What is the output of the given statement?
span class="sy0"> * (= '(this is a list) 1)
a) T
b) NIL
c) Error
d) None of the mentioned
View Answer
Explanation:= is used to test two numbers only.
8. What is the output of the given statement?
*(setf sentence '(a rough road leads to stars)) *(member 'stars sentence)
a) Stars
b) Road
c) Sentence
d) Leads
View Answer
Explanation: Member is used to see if its first argument is an element of its second argument.
Output:
(STARS)
9. What is the output of the given statement?
span class="sy0"> * (setf pairs '((maple shade) (apple fruit))) * (member '(maple shade) pairs)
a) Shade
b) Maple
c) T
d) Nil
View Answer
Explanation: Any symbol beginning with a colon is said to be a keyword.
Output:
NIL
10. What is the output of the given statement?
span class="sy0"> * (setf predicate #'equal) * (member '(maple shade) '((maple shade) (apple fruit)) :test predicate)
a) T
b) NIL
c) ((MAPLE SHADE) (APPLE FRUIT))
d) None of the mentioned
View Answer
Explanation: Procedure object is build from the procedure by using #, So it is printing ((MAPLE SHADE) (APPLE FRUIT)).
Output:
((MAPLE SHADE) (APPLE FRUIT))
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