McqMate
1. 
= ∈{ } w has at least as many occurrences of (110)’s as (011)’s}. Let L {w 0,1 * 2 = ∈{ } w has at least as many occurrence of (000)’s as (111)’s}. Which one of the following is TRUE? 
A.  L1 is regular but not L2 
B.  L2 is regular but not L1 
C.  Both L1 and L2 are regular 
D.  Neither L1 nor L2 are regular 
Answer» B. L2 is regular but not L1 
2. 
A spanning tree for a simple graph of order 24 has 
A.  12 edges 
B.  6 edges 
C.  23 edges 
D.  None of above. 
Answer» C. 23 edges 
3. 
If G is a simple connected 3regular planar graph where every region is bounded by exactly 3 edges, then the edges of G is 
A.  3 
B.  4 
C.  6 
D.  5 
Answer» C. 6 
4. 
If G is a connected planar graph of v vertices e edges and r regions then 
A.  ve+r=2 
B.  ev+r=2 
C.  v+er=2 
D.  None of above. 
Answer» A. ve+r=2 
5. 
A Hamiltonian cycle in a Hamiltonian graph of order 24 has 
A.  12 edges. 
B.  24 edges 
C.  23 edges 
D.  None of above. 
Answer» B. 24 edges 
6. 
If G is a simple connected 3regular planar graph where every region is bounded by exactly 3 edges, then the edges of G is 
A.  3 
B.  4 
C.  6 
D.  5 
Answer» C. 6 
7. 
The following grammar

A.  is type 3 
B.  is type 2 but not type 3 
C.  is type 1 but not type 2 
D.  is type 0 but not type 1 
Answer» B. is type 2 but not type 3 
8. 
The following grammar

A.  is type 3 
B.  is type 2 but not type 3 
C.  is type 1 but not type 2 
D.  is type 0 but not type 1 
Answer» C. is type 1 but not type 2 
9. 
The following grammar

A.  is type 3 
B.  is type 2 but not type 3 
C.  is type 1 but not type 2 
D.  is type 0 but not type 1 
Answer» A. is type 3 
10. 
P, Q, R are three languages. If P & R are regular and if PQ=R, then 
A.  Q has to be regular 
B.  Q cannot be regular 
C.  Q need not be regular 
D.  Q has to be a CFL 
Answer» C. Q need not be regular 
11. 
Which of the following is true with respect to Kleene’s theorem?

A.  1 only 
B.  2 only 
C.  Both 1 and 2 are true statements 
D.  None is true 
Answer» C. Both 1 and 2 are true statements 
12. 
Automaton accepting the regular expression of any number of a ' s is: 
A.  a* 
B.  ab* 
C.  (a/b)* 
D.  a*b*c 
Answer» A. a* 
13. 
Grammars that can be translated to DFAs: 
A.  Left linear grammar 
B.  Right linear grammar 
C.  Generic grammar 
D.  All of these 
Answer» B. Right linear grammar 
14. 
Two strings x and y are indistinguishable if: 
A.  δ*(s, x) = δ* (s, y), i.e. the state reached by a DFA M on input x is the same as the state reached by M on input y 
B.  if for every string z Є ∑* either both xz and yz are in language A on ∑* or both xz and yz are not in A 
C.  Both above statements are true 
D.  None of the above 
Answer» C. Both above statements are true 
15. 
Given an arbitrary nondeterministic finite automaton NFA with N states, the maximum number of states in an equivalent minimized DFA is at least: 
A.  N2 
B.  2N 
C.  2N 
D.  N! 
Answer» C. 2N 
16. 
Regular expressions are 
A.  Type 0 language 
B.  Type 1 language 
C.  Type 2 language 
D.  Type 3 language 
Answer» A. Type 0 language 
17. 
The regular expression 0*(10)* denotes the same set as 
A.  (1*0)*1* 
B.  0+(0+10)* 
C.  (0+1)*10(0+1)* 
D.  None of the above 
Answer» B. 0+(0+10)* 
18. 
Consider the NFA M shown below. Let the language accepted by M be L. Let L1 be the language accepted by the NFA M1, obtained by changing the accepting state of M to a nonaccepting state and by changing the nonaccepting state of M to accepting states. Which of the following statements is true? 
A.  L1 = {0,1}* − L 
B.  L1 = {0,1}* 
C.  L1 is a subset of L 
D.  L1 = L 
Answer» A. L1 = {0,1}* − L 
19. 
Which of the statements is true: 
A.  The complement of a regular language is always regular. 
B.  Homomorphism of a regular language is always regular. 
C.  Both of the above are true statements 
D.  None of the above 
Answer» C. Both of the above are true statements 
20. 
The regular sets are closed under: 
A.  Union 
B.  Concatenation 
C.  Kleene closure 
D.  All of the above 
Answer» D. All of the above 
21. 
Any given transition graph has an equivalent: 
A.  regular 
B.  DFSM (Deterministic Finite State Machine) 
C.  NDFSM 
D.  All of them 
Answer» D. All of them 
22. 
A language is regular if and only if 
A.  Accepted by DFA 
B.  Accepted by PDA 
C.  Accepted by LBA 
D.  Accepted by Turing machine 
Answer» A. Accepted by DFA 
23. 
Which of the following is not a regular expression? 
A.  [(a+b)*(aa+bb)]* 
B.  [(0+1)(0b+a1)*(a+b)]* 
C.  (01+11+10)* 
D.  (1+2+0)*(1+2)* 
Answer» B. [(0+1)(0b+a1)*(a+b)]* 
24. 
Consider the regular language L = (111+111111)*. The minimum number of states inany DFA accepting this language is 
A.  3 
B.  5 
C.  8 
D.  9 
Answer» D. 9 
25. 
How many strings of length less than 4 contains the language described by the regular expression (x+y)*y(a+ab)*? 
A.  7 
B.  10 
C.  12 
D.  11 
Answer» D. 11 
26. 
Which of the following is TRUE? 
A.  Every subset of a regular set is regular 
B.  Every finite subset of a nonregular set is regular 
C.  The union of two nonregular sets is not regular 
D.  Infinite union of finite sets is regular 
Answer» B. Every finite subset of a nonregular set is regular 
27. 
The minimum state automaton equivalent to the above FSA has the following number of states 
A.  1 
B.  2 
C.  3 
D.  4 
Answer» B. 2 
28. 
Which one of the following languages over the alphabet {0,1} is described by the regular expression: (0+1)*0(0+1)*0(0+1)*? 
A.  The set of all strings containing the substring 00. 
B.  The set of all strings containing at most two 0’s. 
C.  The set of all strings containing at least two 0’s. 
D.  The set of all strings that begin and end with either 0 or 1. 
Answer» C. The set of all strings containing at least two 0’s. 
29. 
Let w be any string of length n is {0,1}*. Let L be the set of all substrings of w. What is the minimum number of states in a nondeterministic finite automaton that accepts L? 
A.  n1 
B.  n 
C.  n+1 
D.  2n1 
Answer» C. n+1 
30. 
Which of the following are regular sets? 
A.  I and IV only 
B.  I and III only 
C.  I only 
D.  IV only 
Answer» A. I and IV only 
31. 
A minimum state deterministic finite automation accepting the language L={W W ε {0,1}*, number of 0s and 1s in are divisible by 3 and 5, respectively} has 
A.  15 states 
B.  11 states 
C.  10 states 
D.  9 states 
Answer» A. 15 states 
32. 
Let P be a regular language and Q be contextfree language such that Q ∈ P. (For example, let P be the language represented by the regular expression p*q* and Q be {pnqn n∈ N}). Then which of the following is ALWAYS regular? 
A.  P ∩ Q 
B.  P – Q 
C.  ∑* – P 
D.  ∑* – Q 
Answer» C. ∑* – P 
33. 
Given a Nondeterministic Finite Automation (NFA) with states p and r as initial and final states respectively and transition table as given below:

A.  5 
B.  4 
C.  3 
D.  2 
Answer» C. 3 
34. 
Which one of the following statement is true for a regular language L over {a} whose minimal finite state automation has two states? 
A.  L must be either {an I n is odd} or {an I n is even} 
B.  L must be {an I n is odd} 
C.  L must be {an I n is even} 
D.  L must be {an I n = 0} 
Answer» A. L must be either {an I n is odd} or {an I n is even} 
35. 
The …………. is said to be ambiguous if there exist at least one word of its language that can be generated by the different production tree . 
A.  CFL 
B.  CFG 
C.  GTG 
D.  None of the given 
Answer» B. CFG 
36. 
Type1 Grammar is known as_____________ 
A.  CFG 
B.  CSG 
C.  REGULAR 
D.  All 
Answer» B. CSG 
37. 
If G is “S → a S/a”, then L(G) = ? 
A.  a* 
B.  ^ 
C.  {a}+ 
D.  Both (a) & (c) 
Answer» C. {a}+ 
38. 
“S →a S”, what is the type of this production? 
A.  Type 0 
B.  Type 1 
C.  Type 2 
D.  Type 3 
Answer» D. Type 3 
39. 
A→abA a type __________productions 
A.  Type 0 
B.  Type 1 
C.  Type 2 
D.  Type 3 
Answer» B. Type 1 
40. 
The following CFG is in S → AB**spaceB → CD**spaceB → AD**spaceB → b**spaceD → AD**spaceD → d**spaceA → a**spaceC → a 
A.  Chomsky normal form but not strong Chomsky normal form 
B.  Weak Chomsky normal form but not Chomsky normal form 
C.  Strong Chomsky normal form 
D.  Greibach normal form 
Answer» C. Strong Chomsky normal form 
41. 
The language accepted by a Push down Automata: 
A.  Type0 
B.  Type1 
C.  Type2 
D.  Type3 
Answer» C. Type2 
42. 
Which of the following problems is undecidable? 
A.  Membership problem for CFGs 
B.  Ambiguity problem for CFGs 
C.  Finiteness problem for Finite state automata FSAs 
D.  Equivalence problem for FSAs 
Answer» B. Ambiguity problem for CFGs 
43. 
Which one of the following statement is FALSE? 
A.  contextfree languages are closed under union 
B.  contextfree languages are closed under concatenation 
C.  contextfree languages are closed under intersection 
D.  contextfree languages are closed under Kleene closure 
Answer» C. contextfree languages are closed under intersection 
44. 
Which of the following statement is wrong? 
A.  Any regular language can be generated by a contextfree grammar 
B.  Some nonregular languages cannot be generated by any CFG 
C.  the intersection of a CFL and regular set is a CFL 
D.  All nonregular languages can be generated by CFGs. 
Answer» D. All nonregular languages can be generated by CFGs. 
45. 
Which of the following strings is not generated by the following grammar? S → SaSbS ε 
A.  aabb 
B.  abab 
C.  aababb 
D.  aaabb 
Answer» D. aaabb 
46. 
Which of the following regular expression identity is true? 
A.  r(*) = r* 
B.  (r*s*)* = (r + s)* 
C.  (r + s)* = r* + s* 
D.  r*s* = r* + s* 
Answer» B. (r*s*)* = (r + s)* 
47. 
A language L is accepted by a FSA iff it is 
A.  CFL 
B.  CSL 
C.  Recursive 
D.  Regular 
Answer» D. Regular 
48. 
Consider the following

A.  A leftmost derivation 
B.  A rightmost derivation 
C.  Both leftmost and rightmost derivation 
D.  Neither leftmost nor rightmost derivation 
Answer» D. Neither leftmost nor rightmost derivation 
49. 
Consider the following language L = {anbncndn n ≥ 1} L is 
A.  CFL but not regular 
B.  CSL but not CFL 
C.  Regular 
D.  Type 0 language but not type 1 
Answer» B. CSL but not CFL 
50. 
A language is represented by a regular expression (a)*(a + ba). Which of the following strings does not belong to the regular set represented by the above expression? 
A.  aaa 
B.  aba 
C.  abab 
D.  aa 
Answer» C. abab 
51. 
Which of the following denotes Chomskianhiearchy? 
A.  REG ⊂ CFL ⊂ CSL ⊂ type0 
B.  CFL ⊂ REG ⊂ type0 ⊂ CSL 
C.  CSL ⊂ type0 ⊂ REG ⊂ CFL 
D.  CSL ⊂ CFL ⊂ REG ⊂ type0 
Answer» A. REG ⊂ CFL ⊂ CSL ⊂ type0 
52. 
The concept of FSA is much used in this part of the compiler 
A.  Lexical analysis 
B.  Parser 
C.  Code generation 
D.  Code optimization 
Answer» A. Lexical analysis 
53. 
The following grammar G = (N, T, P, S)**spaceN = {S, A, B, C, D, E}**spaceT = {a, b, c}**spaceP : S → aAB**spaceAB → CD**spaceCD → CE**spaceC → aC**spaceC → b**spacebE → bc is 
A.  is type 3 
B.  is type 2 but not type 3 
C.  is type 1 but not type 2 
D.  is type 0 but not type 1 
Answer» C. is type 1 but not type 2 
54. 
The following CFG is in S → aBB**spaceB → bAA**spaceA → a**spaceB → b 
A.  Chomsky normal form but not strong Chomsky normal form 
B.  Weak Chomsky normal form but not Chomsky normal form 
C.  Strong Chomsky normal form 
D.  Greibach normal form 
Answer» D. Greibach normal form 
55. 
Which of the following statements is wrong? 
A.  The regular sets are closed under intersection 
B.  The class of regular sets is closed under substitution 
C.  The class of regular sets is closed under homomorphism 
D.  Context Sensitive Grammar(CSG) can be recognized by Finite State Machine 
Answer» D. Context Sensitive Grammar(CSG) can be recognized by Finite State Machine 
56. 
Context free grammar is not closed under 
A.  Product operation 
B.  Union 
C.  Complementation 
D.  kleene star 
Answer» C. Complementation 
57. 
Let the class of language accepted by finite state machine be L1 and the class of languages represented by regular expressions be L2 then 
A.  L1 
B.  L1>=L2 
C.  L1 U L2 = .* 
D.  L1=L2 
Answer» D. L1=L2 
58. 
Which of the following statement is wrong? 
A.  Any regular language has an equivalent contextfree grammar. 
B.  Some nonregular languages can’t be generated by any contextfree grammar 
C.  Intersection of context free language and a regular language is always contextfree 
D.  All languages can be generated by context free grammar 
Answer» D. All languages can be generated by context free grammar 
59. 
Grammar that produce more than one Parse tree for same sentence is: 
A.  Ambiguous 
B.  Unambiguous 
C.  Complementation 
D.  Concatenation 
Answer» A. Ambiguous 
60. 
The language accepted by a Push down Automata: 
A.  Type 0 
B.  Type 1 
C.  Type 2 
D.  Type 3 
Answer» C. Type 2 
61. 
The PDA is called nondeterministic PDA when there are more than one out going edges from……… state: 
A.  START or READ 
B.  POP or REJECT 
C.  READ or POP 
D.  PUSH or POP 
Answer» C. READ or POP 
62. 
Let L be a language defined over an alphabet ∑,then the language of strings , defined over ∑, not belonging to L denoted by LC or L. is called : 
A.  Non regular language of L 
B.  Complement of the language L 
C.  None of the given 
D.  All of above 
Answer» B. Complement of the language L 
63. 
All NonNull words of the CFL can be generated by the corresponding CFG which is in CNF i.e the grammar in CNF will generate the same language except the: 
A.  String 
B.  Regular language 
C.  Null string 
D.  None of the above 
Answer» C. Null string 
64. 
Let L={w (0 + 1)* w has even number of 1s}, i.e. L is the set of all bit strings with even number of 1s. Which one of the regular expression below represents L? 
A.  (0*10*1)* 
B.  0*(10*10*)* 
C.  0*(10*1*)*0* 
D.  0*1(10*1)*10* 
Answer» B. 0*(10*10*)* 
65. 
Consider the following Finite State Automaton The language accepted by this automaton is given by the regular expression 
A.  b*ab*ab*ab 
B.  (a+b)* 
C.  b*a(a+b)* 
D.  b*ab*ab 
Answer» C. b*a(a+b)* 
66. 
Let L1 be a recursive language. Let L2 and L3 be languages that are recursively enumerable but not recursive. Which of the following statements is not necessarily true? 
A.  L2L1 is recursively enumerable 
B.  L1L3 is recursively enumerable 
C.  L2 intersection L1 is recursively enumerable 
D.  L2 union L1 is recursively enumerable 
Answer» B. L1L3 is recursively enumerable 
67. 
Let L denotes the language generated by the grammar S – OSO/00. Which of the following is true? 
A.  L = O 
B.  L is regular but not O 
C.  L is context free but not regular 
D.  L is not context free 
Answer» B. L is regular but not O 
68. 
Let S and T be language over ={a,b} represented by the regular expressions (a+b*)* and (a+b)*, respectively. Which of the following is true? 
A.  ScT (S is a subset of T) 
B.  TcS (T is a subset of S) 
C.  S=T 
D.  SnT=Ø 
Answer» C. S=T 
69. 
Which of the following pairs have DIFFERENT expressive power? 
A.  Deterministic finite automata (DFA) and NonDeterministic finite automata(NFA) 
B.  Deterministic push down automata (DPDA) and Nondeterministic pushdown automata 
C.  Deterministic singletape Turing machine and Nondeterministic singletape Turing Machine 
D.  Singletape Turing machine and multitape Turing machine 
Answer» B. Deterministic push down automata (DPDA) and Nondeterministic pushdown automata 
70. 
Match all items in Group 1 with correct options from those given in Group 2. List I List II**spaceP. Regular Expression 1. Syntax analysis**spaceQ. Push down automata 2. Code Generation**spaceR. Dataflow analysis 3. Lexical analysis**spaceS. Register allocation 4. Code optimization 
A.  P4, Q1, R2, S3 
B.  P3, Q1, R4, S2 
C.  P3, Q4, R1, S2 
D.  P2, Q1, R4, S3 
Answer» B. P3, Q1, R4, S2 
71. 
A minimum state deterministic finite automation accepting the language L = {W W € {0,1}* , number of 0's and 1's in W are divisible by 3 and 5 respectively has 
A.  15 states 
B.  11 states 
C.  10 states 
D.  9 states 
Answer» A. 15 states 
72. 
Any Language generated by an unrestricted grammar is: 
A.  Recursive 
B.  Recursively Enumerable 
C.  Not Recursive 
D.  None of the above 
Answer» A. Recursive 
73. 
The Family of recursive language is not closed under which of the following operations: 
A.  Union 
B.  Intersection 
C.  Complementation 
D.  None of the above. 
Answer» D. None of the above. 
74. 
PCP is: 
A.  Decidable 
B.  Undecidable 
C.  Sometimes Decidable 
D.  None of the 
Answer» B. Undecidable 
75. 
If PCP is decidable then MPCP is 
A.  Decidable 
B.  Undecidable 
C.  Can’t Say 
D.  None of the 
Answer» C. Can’t Say 
76. 
Consider a language L for which there exists a Turing machine ™, T, that accepts every word in L and either rejects or loops for every word that is not in L. The language L is 
A.  NP hard 
B.  NP complete 
C.  Recursive 
D.  Recursively enumerable 
Answer» D. Recursively enumerable 
77. 
Consider the following statements

A.  I only 
B.  I and II 
C.  I and III 
D.  II and III 
Answer» B. I and II 
78. 
Recursively enumerable languages are not closed under 
A.  Union 
B.  homomorphism 
C.  complementation 
D.  concatenation 
Answer» C. complementation 
79. 
Which of the following problem is undecidable? 
A.  Membership problem for CFL 
B.  Membership problem for regular sets 
C.  Membership problem for CSL 
D.  Membership problem for type 0 languages 
Answer» D. Membership problem for type 0 languages 
80. 
Recursive languages are 
A.  A proper superset of CFL 
B.  Always recognized by PDA 
C.  Are also called type 0 languages 
D.  Always recognized by FSA 
Answer» A. A proper superset of CFL 
81. 
Consider the following problem x. Given a Turing machine M over the input alphabet Σ, any state q of M. And a word w Є Σ*, does the computation of M on w visit the state q? Which of the following statements about x is correct? 
A.  X is decidable 
B.  X is undecidable but partially decidable 
C.  X is undecidable and not even partially decidable 
D.  X is not a decision problem 
Answer» A. X is decidable 
82. 
If a language is denoted by a regular expression L = ( x )* (x y x ), then which of the following is not a legal string within L ? 
A.  yx 
B.  xyx 
C.  x 
D.  xyxyx 
Answer» D. xyxyx 
83. 
Given A = {0,1} and L = A*. If R = (0n1n, n > 0), then language L ∪ R and R are respectively 
A.  Regular, regular 
B.  Not regular, regular 
C.  Regular, not regular 
D.  Context free, not regular 
Answer» D. Context free, not regular 
84. 
If L1 and L2 are context free language and R a regular set, then which one of the languages below is not necessarily a context free language? 
A.  L1 L2 
B.  L1 ∩ L2 
C.  L1 ∩ R 
D.  L1 ∪ L2 
Answer» B. L1 ∩ L2 
85. 
The logic of pumping lemma is a good example of 
A.  Pigeonhole principle 
B.  Divideandconquer technique 
C.  Recursion 
D.  Iteration 
Answer» A. Pigeonhole principle 
86. 
For two regular languages L1 = (a + b)* a and L2 = b (a + b ) *, the intersection of L1 and L2 is given by 
A.  (a + b ) * ab 
B.  ab (a + b ) * 
C.  a ( a + b ) * b 
D.  b (a + b ) * a 
Answer» D. b (a + b ) * a 
87. 
Pumping lemma is generally used for proving that 
A.  Given grammar is regular 
B.  Given grammar is not regular 
C.  Whether two given regular expressions are equivalent or not 
D.  None of these 
Answer» B. Given grammar is not regular 
88. 
What is the highest type number which can be applied to the following grammar? S —>Aa, A —> Ba, B —>abc 
A.  Type 0 
B.  Type 1 
C.  Type 2 
D.  Type 3 
Answer» C. Type 2 
89. 
Following syntaxdirected translation scheme is used with a shift reduction (bottom up) parser that perform the action in braces immediately after a reduction by the corresponding production

A.  0202021 
B.  1202020 
C.  1020202 
D.  None of these 
Answer» A. 0202021 
90. 
FSM can recognize 
A.  Any grammar 
B.  Only CG 
C.  Both (a) and ( b ) 
D.  Only regular grammar 
Answer» D. Only regular grammar 
91. 
Basic limitation of FSM is that it 
A.  Cannot remember arbitrary large amount of information 
B.  Sometimes fails to recognize grammars that are regular 
C.  Sometimes recognizes grammars are not regular 
D.  None of these 
Answer» A. Cannot remember arbitrary large amount of information 
92. 
Which of the following are decidable?

A.  1 and 2 
B.  1 and 4 
C.  2 and 3 
D.  2 and 4 
Answer» B. 1 and 4 
93. 
If L and L¯ are recursively enumerable, then L is 
A.  Regular 
B.  Context free 
C.  Context sensitive 
D.  Recursive 
Answer» D. Recursive 
94. 
Which of the following problems is undecidable? 
A.  Membership problem for CFGs 
B.  Ambiguity problem for CFGs. 
C.  Finiteness problem for FSAs. 
D.  Equivalence problem for FSAs. 
Answer» B. Ambiguity problem for CFGs. 
95. 
Fred created a new automaton model which is a push down automaton but with two stacks and the added ability of having commands which do not read input tape but which can pop from one stack and push into the other.This new automaton can recognize (choose strongest result) 
A.  Context Free Language 
B.  Context sensitive language 
C.  Regular language 
D.  Languages recognizable by Turing machine 
Answer» D. Languages recognizable by Turing machine 
96. 
Which of the following statements is/are FALSE?

A.  1 and 4 only 
B.  1 and 3 only 
C.  2 only 
D.  3 only 
Answer» C. 2 only 
97. 
Consider a string s over (0+1)*. The number of 0’s in s is denoted by no(s) and the number of 1’s in s is denoted by n1(s). The language that is not regular is 
A.  L = {s ε (0+1)* I for every prefix s’ of s, I no(s’)n1(s’) I ≤ 2} 
B.  L = {s ε (0+1)* I no(s) mod 7 = n1(s) mod 5 = 0} 
C.  L = {s ε (0+1)* I no(s) is a 3 digit prime} 
D.  L = {s ε (0+1)* I no(s)n1(s) I ≤ 4 
Answer» D. L = {s ε (0+1)* I no(s)n1(s) I ≤ 4 
98. 
Which one of the following is true regarding FOTRAN? 
A.  It is a context free language 
B.  It is a context sensitive language 
C.  It is a regular language 
D.  None of the above 
Answer» B. It is a context sensitive language 
99. 
Which statement is true? 
A.  The PDA must have one accept state and one reject state 
B.  The PDA must have one accept state and two reject state 
C.  The PDA must have two accept state and two reject state 
D.  There is no reject state in the PDA. 
Answer» D. There is no reject state in the PDA. 
100. 
TM is more powerful than FSM because 
A.  The tape movement is confined to one direction 
B.  It has no finite state control 
C.  It has the capability to remember arbitrary long sequences of input symbols 
D.  None of these 
Answer» B. It has no finite state control 