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2.  Fill in the blanks using the words from the help box.
                                                 ON, binary, base-2 system, 12, bit

                      a.   A __________ is a smallest unit of data represented in the computer.

                      b.   The digit 1(one) represents the electronic state __________.
                      c.   The binary number system is also known as __________.
                      d.   In the hexadecimal number system, the letter C = __________.
                      e.   The computer system understands __________ numbers.

                  3.  Answer in one or two words.
                      a.   What is a group of eight bits called?                                        ____________
                      b.   What is the decimal number system is also known as?                          ____________

                      c.   Which number system uses symbols, 0 to 9 and A to F?                         ____________
                  4.  Think and answer.
                      a.   What is an octal number system?

                           ____________________________________________________________________________
                      b.   What do you understand by the number system? Give an example.

                           ____________________________________________________________________________

                      c.   What do you mean by base in a number system?
                           ____________________________________________________________________________
                      d.   How do you represent data on a computer?

                           ____________________________________________________________________________

                           ____________________________________________________________________________
                      e.   How can we convert a binary number into a decimal number? Give an example.
                           ____________________________________________________________________________

                           ____________________________________________________________________________

                      f.   Write the rules to subtract two binary numbers.
                           ____________________________________________________________________________

                           ____________________________________________________________________________

                  5.  Solve the following:
                      a.   Convert these into the given number system and write their results.
                            (i)  (101)  to decimal number system    __________
                                    2
                           (ii)  (250)  to binary number system     __________
                                    10
                           (iii)  101011  to decimal number system    __________
                                     2
                           (iv)  10111011  to decimal number system   __________
                                      2
                      b.   Perform the following operations on binary numbers:
                            (i)  Subtract (1101)  from (100110)     ____________
                                             2             2
                           (ii)  Add (1000)  and (101) 2            ____________
                                          2


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