Information and Communication Technology MCQ

1071. Sends out signals to co-ordinate how the processor works. It controls how the data moves around parts of the CPU and how it moves between the CPU and memory. Instructions are decoded in the control unit.

Correct Answer: Correct answer is: (A) Control Unit.

Exam Relevance: AP Computer Science Principles, A Level Computer Science, IB Computer Science

Difficulty: Moderate

Concept notes: The control unit is responsible for coordinating the operations of the CPU by sending signals to other parts of the CPU and managing data flow between the CPU and memory.

Common Mistakes: Students may confuse the control unit with the ALU, which performs arithmetic and logical operations, or with registers, which store data temporarily.

Explanations: The control unit is the part of the CPU that directs and coordinates the activities of the other parts. It decodes instructions and sends the necessary control signals to ensure that the data moves correctly between the CPU and memory, as well as within the CPU itself. This makes the control unit essential for the proper functioning of the CPU.

Option Analysis:

Option A: Correct. The control unit is responsible for coordinating the operations of the CPU and managing data flow.
Option B: Incorrect. The ALU performs arithmetic and logical operations, not coordination of CPU functions.
Option C: Incorrect. Registers store data temporarily, but do not control the flow of data or coordinate CPU operations.
Option D: Incorrect. The CPU is the entire processing unit, not a specific component that controls the flow of data.

Mnemonic: Control Unit: "C" for Coordination.

1072. Which key is used in combination with another key to perform a specific task?

Correct Answer: Correct answer is: (D) Control.

Exam Relevance: Computer Science Exams, IT Certification Exams

Difficulty: Easy

Concept notes: The Control key is often used in combination with other keys to perform specific tasks, such as copying, pasting, or closing programs.

Common Mistakes: Students may confuse the Control key with the Function key, which also has special functions but is used differently.

Explanations: The Control key is a modifier key that, when pressed in combination with other keys, performs specific tasks. For example, pressing Control+C typically copies selected text, and Control+V pastes it. This functionality makes the Control key essential for various keyboard shortcuts.

Option Analysis:

Option A: Function keys are used for specific functions but not typically in combination with other keys for general tasks.
Option B: The Space bar is used to insert spaces and is not typically used in combination with other keys for specific tasks.
Option C: Arrow keys are used for navigation and are not typically used in combination with other keys for specific tasks.
Option D: The Control key is used in combination with other keys to perform specific tasks, making it the correct answer.

Mnemonic: Control + C = Copy, Control + V = Paste

1073. File specification books are created primarily for the use of

Correct Answer: Correct answer is: (B) Programmers.

Exam Relevance: Computer Science, Software Engineering, Programming Exams

Difficulty: Easy

Concept notes: File specification books are detailed documents that describe the structure and format of files used in a computer system. They are primarily used by programmers to understand and work with file structures.

Common Mistakes: Students may mistakenly believe that file specification books are primarily used by systems analysts or operators, as these roles also interact with file structures. However, the detailed technical information in these books is most directly useful to programmers.

Explanations: File specification books provide detailed information about file formats, data structures, and file organization. This information is crucial for programmers who need to write code that reads, writes, and manipulates these files. While other roles such as systems analysts and operators may use this information, the primary audience is programmers who need to implement file handling in their code.

Option Analysis:

Option A: Systems analysts use file specification books to understand file structures, but they are not the primary users.
Option B: Programmers use file specification books to write code that interacts with files, making them the primary users.
Option C: Operators may refer to file specification books, but they are not the primary users.
Option D: Managers may have a high-level understanding of file structures, but they are not the primary users of file specification books.

1074. Designed to allow computer/microprocessor to interface with sensors to allow: physical quantities in the real world to be measured; control of processes by comparing sensor data with prestored data and sending out signals to alter process parameters (for example, open/close a valve).

Correct Answer: Correct answer is: (A) Control/measuring.

Exam Relevance: Control Systems, Electrical Engineering, Computer Engineering

Difficulty: Moderate

Concept notes: The correct answer involves the use of computer or microprocessor systems to interface with sensors for measurement and control purposes.

Common Mistakes: Students may confuse the function of a control/measuring system with other software applications like databases or spreadsheets, which do not directly interface with physical sensors.

Explanations: A control/measuring system allows a computer or microprocessor to interface with sensors to measure physical quantities in the real world. It also enables the comparison of sensor data with prestored data and the sending of signals to alter process parameters, such as opening or closing a valve. This functionality is essential for automation and process control in various industries.

Option Analysis:

Option A: Correct. Control/measuring systems interface with sensors to measure physical quantities and control processes.
Option B: Incorrect. Databases are used for storing and retrieving data, not for interfacing with sensors.
Option C: Incorrect. Spreadsheets are used for data analysis and calculations, not for interfacing with sensors.
Option D: Incorrect. Video editing software is used for manipulating video content, not for interfacing with sensors.

1075. What is a substring?

Correct Answer: Correct answer is: (A) A smaller string extracted from a main string.

Exam Relevance: AP Computer Science, SAT Subject Test in Computer Science

Difficulty: Easy

Concept notes: A substring is a contiguous sequence of characters within a string.

Common Mistakes: Students may confuse a substring with a subsequence, which does not need to be contiguous.

Explanations: A substring is defined as a smaller string that is part of a larger string. It is a contiguous sequence of characters within the main string. This means that the characters in the substring appear in the same order and are adjacent in the main string.

Option Analysis:

Option A: Correct. A substring is indeed a smaller string extracted from a main string.
Option B: Incorrect. A substring is not generated by a program; it is a part of an existing string.
Option C: Incorrect. While there are functions to extract substrings, a substring itself is not a function.
Option D: Incorrect. The correct definition is provided in Option A.

1076. How many secondary groups are there in Tally

Correct Answer: Correct answer is: (B) 13.

Exam Relevance: CA Final, CMA, CS Executive

Difficulty: Easy

Concept notes: In Tally, secondary groups are used to classify and organize ledger accounts for financial reporting purposes. The number of secondary groups is predefined and fixed within the software.

Common Mistakes: Students may confuse secondary groups with primary groups or ledger accounts, leading to incorrect answers.

Explanations: Tally software has a predefined structure for financial reporting, which includes 13 secondary groups. These groups are essential for categorizing ledger accounts to generate financial statements accurately. The correct answer is 13 because this is the fixed number of secondary groups in Tally.

Option Analysis:

Option A: 15 is incorrect as it exceeds the predefined number of secondary groups in Tally.
Option B: 13 is the correct number of secondary groups in Tally.
Option C: 28 is incorrect as it is significantly higher than the predefined number of secondary groups in Tally.
Option D: 3 is incorrect as it is much lower than the predefined number of secondary groups in Tally.

1077. A byte is composed of how many bits?

Correct Answer: Correct answer is: (D) 8.

Exam Relevance: AP Computer Science, SAT Subject Test in Computer Science, A-Level Computing

Difficulty: Very Easy

Concept notes: A byte is a unit of digital information that consists of 8 bits.

Common Mistakes: Students may confuse the number of bits in a byte with other common binary units, such as nibbles (4 bits).

Explanations: A byte is defined as a group of 8 bits. This is a fundamental concept in computer science and digital information theory. Each bit can be either a 0 or a 1, and a byte can represent 256 different values (from 0 to 255).

Option Analysis:

Option A: 2 bits is incorrect as it is too small to be a byte.
Option B: 4 bits is incorrect as it is a nibble, not a byte.
Option C: 6 bits is incorrect as it does not match the standard definition of a byte.
Option D: 8 bits is correct as it matches the standard definition of a byte.

Mnemonic: Byte = 8 bits, think "B" for "Byte" and "8" for the number of bits.

1078. A systems programming language for microcomputers in the Intel family is

Correct Answer: Correct answer is: (C) PL/M.

Exam Relevance: Computer Architecture, Operating Systems, Systems Programming

Difficulty: Moderate

Concept notes: PL/M is a systems programming language designed for microcomputers in the Intel family.

Common Mistakes: Students may confuse PL/M with other programming languages that have similar names, such as PL/C or PL/CT.

Explanations: PL/M is specifically designed for systems programming on Intel microcomputers. It was developed by Intel to facilitate the creation of operating systems and other low-level software for their microprocessors. The language is optimized for the Intel architecture and provides features that are essential for systems programming, such as direct hardware access and efficient memory management.

Option Analysis:

Option A: PL/C is not a recognized language for Intel microcomputers.
Option B: PL/CT is not a recognized language for Intel microcomputers.
Option C: PL/M is the correct language for systems programming on Intel microcomputers.
Option D: PLA is not a recognized language for Intel microcomputers.

1079. A set of parallel wires connecting the CPU of a computer to all other input and output devices:

Correct Answer: Correct answer is: (A) Bus.

Exam Relevance: AP Computer Science Principles, A+ Certification, CompTIA IT Fundamentals

Difficulty: Easy

Concept notes: A bus is a set of parallel wires that connect the CPU to other components in a computer system, allowing data to be transferred between them.

Common Mistakes: Students may confuse the bus with the motherboard, which is the main circuit board of a computer, or with the BIOS, which is the firmware that initializes and tests system hardware components.

Explanations: The bus is the correct answer because it is the set of parallel wires that connect the CPU to all other input and output devices, facilitating data transfer. The motherboard, BIOS, and chips are different components with distinct functions in a computer system.

Option Analysis:

Option A: Correct. The bus is the set of parallel wires that connect the CPU to other components.
Option B: Incorrect. The motherboard is the main circuit board of a computer, not the set of parallel wires.
Option C: Incorrect. The BIOS is the firmware that initializes and tests system hardware, not the set of parallel wires.
Option D: Incorrect. Chips are integrated circuits that perform specific functions, not the set of parallel wires.

Mnemonic: Bus = Bunch of wires, System's highway

1080. Which flag of the 8085's flag register is not accessible to programmerdirectly?

Correct Answer: Correct answer is: (C) Auxiliary carry flag.

Exam Relevance: GATE, GRE, Competitive Programming Exams

Difficulty: Moderate

Concept notes: The 8085 microprocessor has several flags in its flag register, including the Zero flag, Carry flag, Auxiliary carry flag, and Parity flag. Among these, the Auxiliary carry flag is not directly accessible to the programmer.

Common Mistakes: Students often confuse the Auxiliary carry flag with the Carry flag, as both are related to carry operations. However, the Auxiliary carry flag is specifically used for BCD (Binary Coded Decimal) arithmetic and is not directly accessible.

Explanations: The Auxiliary carry flag is used to indicate a carry from bit 3 to bit 4 during BCD arithmetic operations. It is not directly accessible to the programmer because it is used internally by the microprocessor for BCD operations. The other flags (Zero, Carry, and Parity) are directly accessible and can be used in conditional branching and other operations.

Option Analysis:

Option A: The Zero flag is directly accessible to the programmer and is used to indicate if the result of an operation is zero.
Option B: The Carry flag is directly accessible to the programmer and is used to indicate if there is a carry or borrow from the most significant bit.
Option C: The Auxiliary carry flag is not directly accessible to the programmer and is used for BCD arithmetic operations.
Option D: The Parity flag is directly accessible to the programmer and is used to indicate the parity of the result (even or odd).

Mnemonic: Auxiliary carry, BCD, not accessible.

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3 thoughts on “Information and Communication Technology MCQ - Set 108”

Peter Ross April 8, 2020
The MCQ is quite entertaining and will help in increasing knowledge also.
Reyaz Ahmad khan December 26, 2020
plz help me in regard with current Affairs
Eshita Nandpal April 11, 2021
Plz give make a part of unit wise

3 thoughts on “Information and Communication Technology MCQ - Set 108”

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