Teacher , I have a doubt on what software and hardware is .

Software is a set of instructions, data or programs used to operate computers and execute specific tasks. It is the opposite of hardware, which describes the physical aspects of a computer.

Teacher , I also have a doubt on input and output devices 

Input and output devices are hardware components that allow a user to interact with a computer system. Input devices send data to the computer, while output devices display or produce results based on the computer's processing. Common examples include the keyboard (input) and monitor (output).

What is CPU teacher 

Central processing unit (CPU), computer system, generally composed of the main memory, control unit, and arithmetic-logic unit

Also what is primary , secondary and cache memory?

Primary memory is computer memory that a processor or computer accesses first or directly. Cache memory temporarily stores frequently used instructions and data. Secondary memory is non-volatile and persistent in nature and is not directly accessed by a computer/processor.

Also what’s the units of memory ?

The different types of units of data storage include bits, bytes, kilobytes (KB), megabytes (MB), gigabytes (GB), terabytes (TB), petabytes (PB), and exabytes (EB). Each unit represents a multiple of bytes, with larger units indicating exponentially greater amounts of data.

Also what’s the difference between rom and ram ?

RAM stands for Random Access Memory, and ROM stands for Read Only Memory. RAM is memory that stores the data that you're currently working with, but it's volatile, meaning that as soon as it loses power, that data disappears. ROM refers to permanent memory

Also teacher what’s the difference between system software and application software 

System software provides a platform for other software to run, while application software performs specific tasks for the user, so both are necessary in for your computer to work properly.

What are assemblers , interpreters and compilers?

An assembler translates assembly language into machine code. A compiler translates high-level programming languages into machine code before execution. An interpreter translates and executes high-level code line-by-line during runtime, without generating an executable file.

Teacher what is operating system , system utilities and device drivers ?

An operating system is system software that manages computer hardware and software resources, and provides common services for computer programs. System utility programs are used to list or change information that is related to data sets and volumes, such as data set names . A device driver  is a piece of software that enables communication between an operating system or application and hardware or peripheral devices

Thanks teacher , this will really help me to ace the exam 

No problem !