# Practice Test: Question Set - 06

**1. The concept of grammar is much used in this part of the compiler**

- (A) Lexical
analysis

- (B) Parser

- (C) Code
generation

- (D) Code
optimization

**2. Which of the following CFG's can't be simulated by an FSM?**

- (A) S --> Sa
| b

- (B) S
--> aSb | ab

- (C) S -->
abX, X --> cY, Y --> d | aX

- (D) None of
these

**3. The productions**

E—>E+E

E—>E—E

E-->E*E

E —> E / E

E —> id

- (A) Generate an
inherently ambiguous language

- (B) Generate an
ambiguous language but not inherently so

- (C) Are unambiguous

- (D) Can generate
all possible fixed length valid computation for carrying out addition, subtraction,
multiplication and division, which can be expressed in one expression

**4. Consider the following right-linear grammar G = (N, T, P, S) N = {S}**

P : S ? aS|aA T = {a, b}

A ? bA|b**Which of the
following regular expression denotes L(G)?**

- (A) (a + b)*

- (B) a(ab)*b

- (C) aa*bb*

- (D) a*b*

**5. Define for the context free language**

L< {0;1} init (L) = { u | u v Îµ L for some v in {0, 1}}

**If L { w | w is nonempty and has an equal
number of 0's and 1's}, then init (L) is set of all binary strings**

- (A) With unequal
numbers of 0's and 1's

- (B) Including
the null string

- (C) Both (a) and
(b)

- (D) None of
these

**6. Set of regular languages over a given alphabet set is closed under**

- (A) Union

- (B) Complementation

- (C) Intersection

- (D) All of these

**7. The following CFG is in**

S ? AB

B ? CD B ? AD

B ? b

D ? AD

D ? d

A ? a

C ? a

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- (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

**8. In a context-free grammar**- (A) Îµ can't be
the right hand side of any production

- (B) Terminal
symbols can't be present in the left hand side of any production

- (C) Number of
grammar symbols in the left hand side is not greater than the number of grammar
symbols in the right hand side

- (D) All of these

**9. Which of the following regular expressions denotes a language comprising of all possible strings over S = {a, b} of length where n is a multiple of 3.**- (A) (a + b + aa
+ bb + aba + bba)*

- (B) (aaa + bbb)*

- (C) ((a + b)(a +
b)(a + b))*

- (D) (aaa + ab +
a) + (bbb + bb + a)

**10. Context free grammar is not closed under**- (A) Product

- (B) Union

- (C) Complementation

- (D) Kleene Star

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