Computer Fundamental

note!Answer: A) E-mail virus
The Melissa virus of 1999 spread through infected e-mail attachments and was a macro virus that used e-mail to spread.

note!Answer: B) Worm
A worm replicates itself across computers and networks using them as hosts, without needing to attach to a program.

note!Answer: C) A Browser
Internet Explorer is a web browser, a program used to access and view web pages.

note!Answer: B) PrintStream
System.out is a static PrintStream object in the java.lang.System class, used for printing to the standard output.

note!Answer: C) 2^4 - 1
1111 in binary is 8+4+2+1 = 15, which equals 2^4 - 1.

note!Answer: D) 160
Hex A0 = 10×16 + 0 = 160 in decimal. The 'O' is likely a typo for zero.

note!Answer: D) 11000011
C = 1100 and 3 = 0011, so C3 = 11000011 in binary.

note!Answer: C) alphanumeric and other common symbols
ASCII is a 7-bit code representing letters, digits, and common symbols for information interchange.

note!Answer: C) 0110
The 1's complement inverts every bit, so 1001 becomes 0110.

note!Answer: B) 1100
4 is 0100, its 1's complement is 1011, and adding 1 gives 1100.

note!Answer: C) when each decimal digit is represented by four bit binary
Binary Coded Decimal represents each decimal digit separately as a 4-bit binary group.

note!Answer: B) a NOR gate
A NOR gate outputs high only when all of its inputs are low.

note!Answer: C) 2^n
Each of n binary inputs has 2 values, so there are 2^n combinations.

note!Answer: B) 1024 bytes
In computing, 1 KB equals 2^10 = 1024 bytes.

note!Answer: B) keyboard
The keyboard is a primary input device used to enter data into a computer.

note!Answer: A) information
Data processing converts raw data into meaningful information, which is its product.

note!Answer: B) writing
Writing means storing data into a memory or storage location; reading means retrieving it.

note!Answer: A) reading
Reading copies data from memory without erasing it; writing stores data into memory.

note!Answer: A) program
A program is a set of instructions that tells the computer what to do.

note!Answer: C) control unit; arithmetic logic unit and primary storage
The CPU is made up of the control unit, the arithmetic logic unit (ALU) and primary storage (memory).