Computer Science/IT MCQs
Topic Notes: Computer Science/IT
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
171
The process of converting a digital signal to an analog signal is done by a:
Answer:
Digital-to-Analog Converter (DAC)
** A DAC performs the reverse operation of an ADC. It takes a digital signal (a sequence of binary numbers) and converts it into a continuous analog signal. This is used, for example, to produce sound from a digital audio file.
172
"Garbage In, Garbage Out" (GIGO) is a concept related to which characteristic of a computer?
Answer:
Accuracy
** GIGO emphasizes that the accuracy of a computer's output is directly proportional to the accuracy of the input data and instructions. If the input is flawed, the output will also be flawed, regardless of the computer's processing capabilities.
173
The computers we use in our daily lives, like laptops and smartphones, are examples of:
Answer:
Digital computers
** Almost all modern computing devices, from personal computers to servers, are digital computers. They operate on binary data, which allows for a high degree of accuracy and flexibility.
174
The use of plagiarism detection software in academic institutions is an application of computers in:
Answer:
Examination and education integrity
** These software tools use computer algorithms to compare submitted work against a vast database of existing documents to identify potential plagiarism, thus upholding academic honesty.
175
Computers that are used in large organizations such as insurance companies and banks, where many people frequently need to use same data, are____?
Answer:
mainframe computers
Mainframe computers are powerful computers designed for high-volume, transaction-based applications. They are used by large organizations like banks and insurance companies because they can reliably process a massive number of concurrent transactions and support thousands of users accessing the same data simultaneously.
176
What type of computer is classified as being of moderate size?
Answer:
Mini
A mini computer, or minicomputer, is a class of multi-user computers that falls in the middle range of the computing spectrum, between the largest mainframe computers and the smallest microcomputers. They were popular in the 1960s and 1970s for business and scientific applications.
177
The digital divide refers to:
Answer:
The gap between those who have access to modern information and communication technology and those who do not.
** This is a significant social issue related to the application of computers in daily life, as lack of access can lead to disadvantages in education, employment, and social participation.
178
The characteristic of a computer that allows it to perform millions of calculations in a fraction of a second is:
Answer:
Speed
** Computers are incredibly fast devices. Their speed is a result of their electronic components and the ability of the CPU to execute instructions at an extremely high rate.
179
**The term 'hertz' (Hz) is used to measure what in a computer?**
Answer:
Processing speed of the CPU
** The clock speed of a processor is measured in hertz (Hz), typically in gigahertz (GHz) for modern CPUs. It indicates how many processing cycles the CPU can execute per second.
180
The use of computers in education to provide learning materials and courses online is known as:
Answer:
E-learning
** E-learning, or electronic learning, encompasses all forms of education and training that are delivered electronically, often over the internet.