Computer objective type question

  OBJECTIVE TYPE QUESTION   

     1)   Best known example of MAN(metropolitan area network) ?

  Ans  cable tv 

      2)   The number of int between 1 and 250 that are divisible by 2,5,7 is ?  

  Ans   3

      3)   in a broadcast network , a layer that is often thin or non existent is?

             Ans  Network layer

     4)    sql command end with?

            Ans  Semicolon

     5)   Which data structure used to implement recursion?

Ans  Stack

     6)   In BCD adder to add 2 decimal digit needs minimum of?

Ans 5 full adder , 2 half adder

    7)   In order to build mod-18 counter the minimum no. of flip flops needed is equal to?

Ans  5

    8)   The dual of switching fun f=x+yz is given by?

Ans  x(y+z)

     9)   Context free grammar is what type of grammar?

 Ans type 2