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Memory Units Quiz 17 (10 MCQs)

This set of multiple-choice questions evaluates understanding of basic memory units, storage concepts, and computer architecture. It covers CPU memory access, RAM reliability, memory types, and error detection mechanisms like parity bits. The questions assess knowledge of semiconductor memory, including DRAM and ROM, and their functions, as well as the role of memory elements like the Memory Address Register (MAR) and MOS capacitors.

Quiz Instructions

Select an option to see the correct answer instantly.

1. Which of the following memories uses a MOS capacitor as its memory cell?

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

Exam Relevance: Computer Architecture, Digital Electronics, Computer Science Exams

Difficulty: Easy

Concept notes: DRAM (Dynamic Random Access Memory) uses a MOS (Metal-Oxide-Semiconductor) capacitor as its memory cell to store data. The capacitor holds a charge that represents a binary value.

Common Mistakes: A common misunderstanding is that other types of memory like ROM or FIFO also use MOS capacitors. However, these memory types use different storage mechanisms.

Explanations: DRAM uses a MOS capacitor as its memory cell. The capacitor holds a charge that represents a binary value, which is periodically refreshed to maintain the data. ROM (Read-Only Memory) and FIFO (First-In-First-Out) do not use MOS capacitors for their memory cells. ROM typically uses a different type of storage, such as fuses or floating gates, while FIFO is a type of data structure and does not inherently use MOS capacitors.

Option Analysis:

Option A: DRAM uses a MOS capacitor as its memory cell.
Option B: ROM does not use a MOS capacitor as its memory cell.
Option C: FIFO is a data structure and does not inherently use a MOS capacitor.
Option D: Not all the above use a MOS capacitor as their memory cell.

2. To increase the speed of memory access in pipelining, we make use of .....

Correct Answer: Correct answer is: (C) Cache.

Exam Relevance: Computer Architecture, Operating Systems, Computer Organization

Difficulty: Moderate

Concept notes: Cache is a small, fast memory that stores copies of frequently accessed data from the main memory. It reduces the time required to access data by providing faster access to frequently used data.

Common Mistakes: A common misunderstanding is that special memory locations or special purpose registers can significantly increase memory access speed. While these can be useful, they do not provide the same level of speed improvement as cache.

Explanations: Cache is used to increase the speed of memory access in pipelining because it stores frequently accessed data in a faster memory. This reduces the latency associated with accessing data from the main memory, thereby improving overall performance.

Option Analysis:

Option A: Special memory locations do not provide the same level of speed improvement as cache.
Option B: Special purpose registers are used for specific tasks but do not significantly increase memory access speed.
Option C: Cache is a small, fast memory that stores frequently accessed data, reducing memory access time.
Option D: Buffers are used for temporary storage but do not significantly increase memory access speed.

3. What does the Memory Address Register (MAR) do?

Correct Answer: Correct answer is: (B) Hold any memory address about to be used by the CPU. The address might point to data or an instruction.

Exam Relevance: Computer Architecture, Computer Organization, Digital Logic Design

Difficulty: Easy

Concept notes: The Memory Address Register (MAR) is a register in the CPU that holds the address of the memory location to be accessed. It is used to specify the location in memory from which data or instructions are to be fetched or to which data is to be written.

Common Mistakes: A common misunderstanding is that the MAR holds the actual data or instruction, which is incorrect. The MAR only holds the address, not the data itself.

Explanations: The Memory Address Register (MAR) is designed to hold the address of the memory location that the CPU is about to access. This address can point to either data or an instruction. The MAR is crucial for the CPU to know where to read from or write to in memory. It does not store the actual data or intermediate results, which are handled by other registers like the Memory Data Register (MDR) or the Accumulator.

Option Analysis:

Option A: This is incorrect because the MAR does not hold the actual data or instruction. The Memory Data Register (MDR) holds the actual data or instruction fetched from memory or waiting to be written to memory.
Option B: This is correct because the MAR holds the memory address that the CPU is about to use, which can point to either data or an instruction.
Option C: This is incorrect because the MAR does not specifically hold the address of the instruction for each cycle. It holds the address of any memory location that the CPU is about to access.
Option D: This is incorrect because the MAR does not store intermediate results of calculations. The Accumulator or other registers handle intermediate results.

Mnemonic: MAR: Memory Address Register, holds the address, not the data.

4. A device that stores one item of information is

Correct Answer: Correct answer is: (A) Memory element.

Exam Relevance: Computer Science, Digital Electronics, Computer Architecture

Difficulty: Easy

Concept notes: A memory element is a basic unit of storage in a computer system that can hold one bit of information.

Common Mistakes: A common misunderstanding is that other terms like MDR (Memory Data Register) or Memory Guard are basic storage units, but they serve different purposes.

Explanations: A memory element, such as a flip-flop or a capacitor, is designed to store one bit of information. This makes it the correct answer as it directly addresses the question of storing one item of information.

Option Analysis:

Option A: Memory element is the correct term for a basic storage unit that holds one bit of information.
Option B: Block Compaction is a technique used in memory management to reduce fragmentation, not a storage unit.
Option C: MDR (Memory Data Register) is a register that holds data being transferred to or from memory, not a storage unit.
Option D: Memory guard is a security feature to protect memory, not a storage unit.

5. Which of the following is the user programmed semiconductor memory?

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

Exam Relevance: GATE, GRE, JE, CSE

Difficulty: Easy

Concept notes: EPROM (Erasable Programmable Read-Only Memory) is a type of non-volatile memory that can be programmed and erased multiple times. It is user-programmable, making it suitable for applications where the data needs to be updated periodically.

Common Mistakes: A common misunderstanding is that DRAM (Dynamic Random Access Memory) is user-programmable, but DRAM is volatile and does not retain data when power is removed.

Explanations: EPROM is the correct answer because it is a user-programmable semiconductor memory. DRAM is volatile and not user-programmable in the same way. The option "None of the Above" is incorrect because EPROM is indeed a user-programmable memory. The option "All the above" is incorrect because not all the listed options are user-programmable.

Option Analysis:

Option A: DRAM is not user-programmable and is volatile.
Option B: EPROM is user-programmable and non-volatile.
Option C: "None of the Above" is incorrect because EPROM is user-programmable.
Option D: "All the above" is incorrect because not all options are user-programmable.

Mnemonic: EPROM: Erase, Program, Read-Only Memory

6. Computer memory that temporarily stores information is called the .....

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

Exam Relevance: Computer Science Exams, IT Certification Exams, Basic Computing Exams

Difficulty: Easy

Concept notes: RAM stands for Random Access Memory, which is a type of computer memory that temporarily stores information for quick access by the processor.

Common Mistakes: A common misunderstanding is that ROM (Read-Only Memory) is also a temporary storage, but ROM is used for permanent storage of data and instructions.

Explanations: RAM is the correct answer because it is designed to temporarily store data and instructions that the computer's processor needs to access quickly. This makes it ideal for tasks that require fast and frequent data retrieval, such as running applications and processing data.

Option Analysis:

Option A: RAM is the correct answer as it is the type of memory that temporarily stores information.
Option B: ROM stands for Read-Only Memory, which is used for permanent storage and not temporary storage.
Option C: IBM is a company name and not a type of computer memory.
Option D: None of these is incorrect because RAM is the correct answer.

7. Temporary storage for information, including applications and documents. The information must be stored to a permanent device, such as a hard disc or CD-ROM before the power is turned off, or the information will be lost. Computer memory is measured in terms of the amount of information it can store, commonly in megabytes or gigabytes.

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

Exam Relevance: CompTIA A+, CCNA, CIW, ITIL

Difficulty: Easy

Concept notes: Memory in computers refers to the temporary storage of data and programs that are currently in use. It is essential for the operation of the computer as it allows for quick access to information. Memory is measured in units such as megabytes (MB) and gigabytes (GB).

Common Mistakes: A common misunderstanding is that memory is the same as storage. While both are used to hold data, memory is temporary and volatile, meaning data is lost when power is turned off, whereas storage is permanent and retains data even without power.

Explanations: The correct answer is Memory because it accurately describes the temporary storage of information, including applications and documents, which must be saved to a permanent storage device before the power is turned off to avoid data loss. Memory is measured in units such as megabytes and gigabytes, which aligns with the description provided.

Option Analysis:

Option A: Memory is the correct term for temporary storage in a computer.
Option B: Menu refers to a list of options or commands, not a storage unit.
Option C: JavaScript/ECMA script is a programming language, not a storage unit.
Option D: None of the above is incorrect because Memory is the correct answer.

8. In comparison to the internal (main) memory, tape or disk memory is

Correct Answer: Correct answer is: (B) Slower and less expensive.

Exam Relevance: Computer Science Exams, IT Certification Exams, Engineering Exams

Difficulty: Easy

Concept notes: Tape or disk memory is slower than internal (main) memory but is less expensive per unit of storage.

Common Mistakes: A common misunderstanding is that faster memory is always less expensive, which is not true. Internal memory is faster but more expensive compared to tape or disk memory.

Explanations: Tape or disk memory, such as hard drives and solid-state drives, is slower in terms of access time compared to internal (main) memory (RAM). However, tape or disk memory is less expensive per unit of storage. This makes it suitable for long-term storage of large amounts of data, while internal memory is used for temporary storage of data that needs to be accessed quickly.

Option Analysis:

Option A: Incorrect because tape or disk memory is not more expensive than internal memory.
Option B: Correct because tape or disk memory is slower and less expensive than internal memory.
Option C: Incorrect because tape or disk memory is not faster than internal memory.
Option D: Incorrect because tape or disk memory is not faster and less expensive than internal memory.

9. Rom is non-volatile memory

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

Exam Relevance: Computer Science Exams, IT Certification Exams, Engineering Exams

Difficulty: Easy

Concept notes: ROM stands for Read-Only Memory, which is a type of non-volatile memory.

Common Mistakes: A common misunderstanding is that ROM can be easily modified like RAM, but it is designed to retain data even when power is turned off.

Explanations: ROM is a type of non-volatile memory, meaning it retains data even when the power is turned off. This is in contrast to volatile memory like RAM, which loses its data when power is removed. Therefore, the statement that ROM is non-volatile memory is true.

Option Analysis:

Option A: Correct, as ROM is indeed non-volatile memory.
Option B: Incorrect, as ROM retains data without power, making it non-volatile.

10. Which of the following is used to check for errors in RAM chips?

Correct Answer: Correct answer is: (C) Parity chip.

Exam Relevance: Computer Architecture, Digital Electronics, Computer Science Exams

Difficulty: Moderate

Concept notes: Parity chips are used to detect errors in RAM chips by adding an extra bit to each byte of data to ensure the total number of 1s is even or odd.

Common Mistakes: A common misunderstanding is that ROM chips or microprocessor chips are used for error detection in RAM, but they do not have this specific function.

Explanations: Parity chips are specifically designed to detect errors in RAM chips. They add a parity bit to each byte of data, which helps in identifying if any bit has been altered due to errors. This method ensures data integrity by checking the parity of the data bits.

Option Analysis:

Option A: ROM chips are used for storing non-volatile data and do not have error-checking capabilities for RAM.
Option B: Microprocessor chips process data and do not have built-in error-checking mechanisms for RAM.
Option C: Parity chips are used to detect errors in RAM by adding a parity bit to each byte of data.
Option D: EPROM chips are used for storing non-volatile data and do not have error-checking capabilities for RAM.

Frequently Asked Questions

What is the difference between volatile and non-volatile memory?

Volatile memory, such as RAM, loses its data when the power is turned off, while non-volatile memory, like ROM, retains data even without power.

How does a MOS capacitor function in semiconductor memory?

A MOS capacitor stores charge in a thin oxide layer, which represents a bit of data. This charge can be read or written to by the memory controller.

What is the role of the Memory Address Register (MAR) in memory access?

The Memory Address Register holds the address of the memory location that the CPU wants to read from or write to, facilitating memory access.

How does pipelining improve memory access speed?

Pipelining allows multiple instructions to be processed simultaneously, reducing the overall time required for memory access and improving the speed of data retrieval.

What is the purpose of a parity bit in memory?

A parity bit is used for error detection in memory, ensuring data integrity by checking for any changes in the stored data.

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