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4.  The decimal number (345)  is equivalent to ..........................
                                            10
                  a.  (101011001)                               b.  (110111001)
                                 2                                             2
                  c.  (111011101)                               d.  (111110001)
                                 2                                             2
               5.  In binary addition, 0 + 1 is equal to ..........................
                  a.  0                                         b.  1

                  c.  10                                        d.  2

            B.  Write ‘T’ for true and ‘F’ for false.
               1.  A number system is simply a manner of counting.                                       ...............
               2.  The base of decimal number system is 8.                                               ...............

               3.  The word binary comes from 'Bi-' meaning two.                                         ...............
               4.  The octal number system is used as a shorthand

                  representation of long binary numbers.                                                 ...............
               5.  The hexadecimal number system consists of 16 digits.                                  ...............

            C.  Fill in the blanks using the words given below.


                                                 binary, 0, 2, 8, 10, decimal number



               1.  In binary subtraction, 1 – 1 equals to ...................................

               2.  The base of binary number system is ...................................
               3.  The base of .................................. system is 10.

               4.  In binary addition, 1 + 1 is equal to ...................................

               5.  The octal number system consists of .................................. digits.

               6.  Computer system understands .................................. numbers.
            D.  Short answer type questions:
               1.  What is an octal number system?

                  .....................................................................................................................................................................................................

               2.  How many bits are there in 1 nibble?

                  .....................................................................................................................................................................................................
               3.  What do you mean by base in a number system?

                  .....................................................................................................................................................................................................
            E.  Long answer type questions:

               1.  What is number system? Explain.
               2.  What are the rules  to convert a decimal number into a binary number?

               3.  Write the rules to subtract two binary numbers.

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