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Theory of Computation
Finite Automata and Regular Language
Push Down Automata and Context Free Language
Recursively Enumerable Language and Turing Machine
Undecidability
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GATE CSE
Undecidability
Theory of Computation
Previous Years Questions
START HERE
Marks 1
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Which of the following decision problems are undecidable? $$\,\,\,\,\,\,\,\,\,\,{\rm I}.\,\,\,\,\,\,\,\,\,\,$$ Given $$...
GATE CSE 2016 Set 1
GO TO QUESTION
Let $$\sum \, $$ be a finite non - empty alphabet and let $${2^{\sum {{}^ * } }}$$ be the power set of $$\sum {{}^ * .\,...
GATE CSE 2014 Set 3
GO TO QUESTION
Which of the following problems are decidable? $$1.$$ Does a given program ever produce an output? $$2.$$ If L is a cont...
GATE CSE 2012
GO TO QUESTION
Which of the following are decidable? $$1.$$ Whether the intersection of two regular languages is infinite $$2.$$ Whethe...
GATE CSE 2008
GO TO QUESTION
Which of the following statements is false?
GATE CSE 1996
GO TO QUESTION
Marks 2
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Which of the following languages are undecidable? Note that $$\langle M\rangle $$ indicates encoding of the Turing machi...
GATE CSE 2020
GO TO QUESTION
Language $${L_1}$$ is polynomial time reducible to language $${L_2}$$ . Language $${L_3}$$ is polynomial time reducible ...
GATE CSE 2015 Set 3
GO TO QUESTION
Which one of the following problems is un-decidable?
GATE CSE 2014 Set 3
GO TO QUESTION
Which of the following is/are undecidable? $$1.$$ $$G$$ is a $$CFG.$$ Is $$L\left( G \right) = \Phi ?$$ $$2.$$ $$G$$ is...
GATE CSE 2013
GO TO QUESTION
Consider three decision problems $${P_1},$$ $${P_2}$$ and $${P_3}.$$ It is known that $${P_1}$$ is decidable and $${P_2}...
GATE CSE 2005
GO TO QUESTION
Consider the following problem $$X.$$ Given a Turing machine $$M$$ over the input alphabet $$\sum , $$ any state $$q$$ o...
GATE CSE 2001
GO TO QUESTION
Which one of the following is the strongest correct statement about a finite language over some finite alphabet $$\sum ?...
GATE CSE 1991
GO TO QUESTION
It is decidable whether:
GATE CSE 1990
GO TO QUESTION
Which of the following problems are un-decidable?
GATE CSE 1989
GO TO QUESTION
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