IT &computer MCQ section 4 MCQ Questions & Answers Detailed Explanation

Answer: (d)

Electronic waste or E-waste is the collective term for discarded electrical or electronic devices such as computers, mobile phones, etc that enter the waste stream from various sources.

E-waste contains a significant concentration of substances that are highly toxic and are hazardous to human health and the environment.

Answer: (c)

The overall design or description of the database is known as database schema or intension of the database and is specified while designing the database.

The data in the database at a particular point of time is known as database instance of database state or snapshot. The database state is also called an extension of the schema.

Answer: (b)

Random-Access Memory (RAM) is a type of short memory because it is volatile. The stored information is lost if power is removed. All RAM except the CMOS RAM used for the BIOS is volatile.

ROM, on the other hand, is nonvolatile. RAM is the most common type of memory found in computers and other devices, such as printers.

Answer: (a)

An arithmetic-logic unit (ALU) is the part of a computer processor (CPU) that carries out arithmetic and logic operations on the operands in computer instruction words. It performs all arithmetic computations, such as addition and multiplication, and all comparison operations.

Answer: (c)

A flip-flop is a circuit that has two stable states and can be used to store state information. The circuit can be made to change state by signals applied to one or more control inputs and will have one or two outputs.

It is the basic storage element in sequential logic. Flip-flops and latches are a fundamental building block of digital electronics systems used in computers, communications, and many other types of systems.

Answer: (a)

Electronic commerce, commonly known as e-commerce, is the buying and selling of products or services over electronic systems such as the Internet and other computer networks.

Electronic commerce draws on such technologies as electronic funds transfer, supply chain management, Internet marketing, online transaction processing, electronic data interchange (EDI), inventory management systems, and automated data collection systems.