**1) Context free Grammar is ?**

- A Compiler
- A language expression
- A regular expression
- None of these

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**Answer = B**

**Explanation: Context free Grammar generate the context free languages. These are defined by the rule of the form A -> b Where A a non terminal and b is the string of terminals.**

**2) The idea of an automation with a stack as auxiliary storage... ?**

- Finite automata
- Push down automata
- Deterministic automata
- None of these

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**Answer = B**

**Explanation: Push down automata manipulate the stack, as a part of performing a transition.**

**3) A Pushdown automata is.....if there is at most one transition applicable to each configuration ?**

- Deterministic
- Non Deterministic
- Finite
- Non Finite

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**Answer = A**

**Explanation:If in every situation only one transition is available as continuation of computation, then the result is a deterministic push down automation (DPDA).**

**4) The graphical representation of the transition of finite automata is ?**

- Finite diagram
- State diagram
- Node diagram
- E-R diagram

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**Answer = B**

**Explanation: State diagram is called the graphical representation of Finite automata.**

**5) If two sets A and B have no common elements i.e (A intersection B) has no element then such sets are known as ?**

- Intersection
- Union
- Disjoint
- Complement

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**Answer = C**

**Explanation:If two sets have no element in common then they are called disjoint sets.**

**6) The domain D of the relation R is defined as the.... ?**

- Set of all elements of ordered pair which belongs to R
- Set of all last elements of ordered pair which belongs to R
- Set of all first elements of ordered pair which belongs to R
- None of these

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**Answer = C**

**Explanation: No explanation for this question**

**7) 'A language is regular if and only if it is accepted by a finite automation' ?**

- The given statement is true
- The given statement is false
- The given statement is partially true
- Sometime true, sometimes false

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**Answer = A**

**Explanation: A regular language is accepted by the finite automation. Every regular language is context free.**

**8) Which of the following does not belong to the context free grammer?**

- Terminal symbol
- Non-terminal symbol
- Start symbol
- End symbol

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**Answer = D**

**Explanation:Context free grammar consist of terminal symbols, non terminal symbols, set of production rules, a start symbol but does not have any End symbol.**

**9) A regular grammar is a..... ?**

- Context free grammar
- Non context free grammar
- English grammar
- None of above

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**Answer = A**

**Explanation: Regular grammar is context free grammar. Such a grammar restricts its rules to a single non terminal on the left hand side and right hand side consisting of a single terminal.**

**10) The context free language are closed under... ?**

- Union
- Kleene star
- Concatenation
- All of above

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**Answer = D**

**Explanation: Context free language is closed under union, kleene star and concatenation.**

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