1) .................. number system is used by the computer ? a) Decimal b) Binary c) Hexadecimal d) Octal 2) Convert (1011) in to decimal number? a) 10 b) 12 c) 11 d) 16 3) What are the symbols used to represent digits in the binary number system? a) 0,1 b) 0,1,2 c) 0 through 8 d) 1,2 4) Convert the binary number 1100111 a) 010 b) 123 c) 147 d) 137 5) Decimal number stored in to a computer in the form of ....? a) Hexadecimal b) Binary c) Octal d) Any form

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