The '+' sign is used for representing OR operation.

The 1's complement of a number is obtained by changing all the ones to zeros and vice versa.

A thread of execution is the smallest sequence of programmed instructions that can be managed independently by an operating system. It is sometimes called a lightweight process. It is a basic unit of CPU utilization.

&num gives the address of the variable num.

An optical fiber is a very thin fiber made of glass that functions as a waveguide for light. It transmits signals in the form of light i.e. the visible part of the spectrum.

Computer can only perform tasks that it has been programmed to do. Computer cannot do any work without instructions from the user. It executes instructions as specified by the user and does not take its own decisions.

Paging is a memory-management scheme that permits the physical-address space of a process to be non-contiguous.

FLOPS (for FLoating-point Operations Per Second) is a measure of computer performance. It is especially used in fields of scientific calculations.

A kernel is a central component of an operating system. It acts as an interface between the user applications and the hardware. The sole aim of the kernel is to manage the communication between the software (user level applications) and the hardware (CPU, disk memory etc.)

A stack is a last in first out type of data structure. Here, the insertion and deletion of elements can be done only from one end.

A register is one of a small sets of data holding places that are part of a computer processor.

The default value of static variables is garbage.

Arranging the records in some logical order is referred to as sorting.

If block need not always be associated with an else block. However, an else block is always associated with an if block.

Inheritance is the process of forming a new class from an existing class or base class.The base class is also known as parent class or super class, the new class that is formed is called derived class.Derived class is also known as a child class or sub class. Inheritance helps in reducing the overall code size of the program, which is an important concept in object-oriented programming.