HSSC Computer Notes - 1

1. Which unit is responsible for converting the data received from the user into computer understandable format?
 a) Memory Unit
 b) Arithmetic & Logic Unit
c) Input Unit
d) Output Unit

 Answer: c
 Explanation: The Input Unit converts the data, which the user enters into a language which the computer understands, i.e. it converts the data into binary format. The Output Unit is responsible for giving the results in user understandable format. The Storage Unit is responsible for storing the data after immediate results of processing whereas; the ALU is responsible for various arithmetic and bitwise operations.

2. The only language which the computer understands is ______________
a) Assembly Language
b) Binary Language
d) C Language
 ---- Answer: b 
Explanation: The Computer understands only binary language which is written in the form of 0s & 1s. A computer can understand assembly language but an assembler is required which converts the assembly language to binary language. Similarly, for understanding high level languages, compilers/interpreters are required.

Computer System Basic 

Computer System Parts 

 3. The smallest unit of data in computer is ________________
a) Byte
b) Nibble
c) Bit
d) KB

 Answer: c 
Explanation: A bit is defined as the smallest unit of data in a computer system. It is used as a short form of Binary Digit. A bit can have only two values 0 or 1. A nibble comprises of 4 bits, a byte is a collection of 8 bits whereas KB (Kilobyte) is equal to 1024 bytes.

 4. One nibble is equivalent to how many bits?
a) 2
b) 4
c) 8
d) 1

 Answer: b 

Explanation: A nibble is defined as a unit of data which comprises of 4 binary digits or half of 8-bit byte. Therefore, 1 nibble = 4 bits. A bit is the smallest unit of data in a computer system. A byte = 8 bits, therefore, half of a byte=4 bits=a nibble.

 5. Which of the following describes the correct format of an input instruction?
a) IN 82
b) INPUT 82
c) INP 82
d) 82 INP

 Answer: a 

Explanation: The input/output instructions are used to transfer information between external peripherals and the CPU. The correct format of an input instruction is: IN 8-bit port address. Here, IN 82 is the correct option, where 82 is the designated port address. All the other options are invalid.

Advantage of computer  

Reliability of computer


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