Answer / chaitanya

In Prolog, backtracking is a process adopted by Prolog.  When a sub-goal fails in Prolog, the Prolog system moves its steps backwards to the previous goal and tries to re-satisfy it. Backtracking enables Prolog to find all alternative solutions to a given query.

What is the output of the given statement? * (setf toss ‘(heads tails tails tails heads tails)) * (delete ‘heads toss) * toss a) Heads tails b) Heads tails tails tails tails c) Heads d) None of the mentioned

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 What is the output of the following statement in LISP? * (setf thing ‘point r 1) * (case thing (circle (*pi r r))(sphere (* 4 pi r r)) (otherwise 0)) a) 1 b) 0 c) 12.566 d) None of the mentioned

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 Which is a procedures supplied by user in terms of primitives? a) Custom b) User-defined c) Definite d) All of the mentioned

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 What is the output of the given statement? * (setf pressure -3) * (when-plusp pressure (print ‘alarm)); a) T b) Nil c) Alarm d) None of the mentioned

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Explain what is backtracking in Prolog?

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Which do not evaluate their arguments in LISP? a) List b) Procedure c) Setf d) Macros

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Which creates reader procedures for getting things out of an instance fields? a) Structure in LISP b) Defstruct c) Class d) Object

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 What is the output of the given statement? * (endp ‘(this is not empty)) a) T b) NIL c) Error d) None of the mentioned

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 What is the output of the following statement? * (setf meals ‘(breakfast lunch tea dinner)) * (cons (first meals) (last meals)) a) Breakfast b) Lunch c) Dinner d) Both a & c

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 Which hides details behind abstraction boundaries? a) Procedures b) Procedure abstraction c) Recursion d) Both a & b

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What is a data type in which expressions are stored in places identified by integer indexes in LISP? a) Structure b) List c) Array d) None of the mentioned

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 Explain why PROLOG language is stated as a procedural language?

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