Direct
Indirect
Immediate
All of these
Answer: 4. All of these
Explanation:
CPUs use various addressing techniques to access data and instructions in memory. The most common addressing techniques include:
Direct Addressing: The operand's address is directly specified in the instruction.
Indirect Addressing: The instruction contains the address of a memory location that holds the actual address of the operand.
Immediate Addressing: The operand itself is included in the instruction, so no memory access is needed to fetch the operand.
These techniques are fundamental to how CPUs process instructions and data efficiently.
Utility software
Speed up utilities
Optimizing compilers
None of the mentioned
Answer: 3. Optimizing compilers
Explanation:
Optimizing compilers are designed to generate efficient machine code for pipelined systems. They rearrange instructions to minimize pipeline stalls and maximize throughput by ensuring that the CPU's pipeline is utilized effectively. This is crucial for improving the performance of modern processors.
Superscalar operation
Assembly line operation
Von Neumann cycle
None of the mentioned
Answer: 2. Assembly line operation
Explanation:
Pipelining in CPUs is often compared to an assembly line in manufacturing. Just as an assembly line divides a task into smaller stages performed simultaneously, pipelining divides instruction execution into stages (e.g., fetch, decode, execute, write-back) to improve throughput and efficiency.
1
2
3
4
Answer: 1. 1
Explanation:
In pipelining, each stage (e.g., fetch, decode, execute) is designed to complete its task within one clock cycle. This ensures that instructions flow smoothly through the pipeline without delays, maximizing the CPU's efficiency.
Special memory locations
Special purpose registers
Cache
Buffers
Answer: 3. Cache
Explanation:
Cache memory is used to increase the speed of memory access in pipelined systems. It stores frequently accessed data and instructions closer to the CPU, reducing the time needed to fetch them from slower main memory. This helps prevent pipeline stalls and improves overall performance.
Structural hazard
Stalk
Deadlock
None of the mentioned
Answer: 1. Structural hazard
Explanation:
A structural hazard occurs when multiple instructions in a pipeline compete for the same hardware resource (e.g., memory, ALU). This can cause delays or stalls in the pipeline, reducing its efficiency. Structural hazards are a common issue in pipelined architectures.
Data hazard
Stock
Deadlock
Structural hazard
Answer: 1. Data hazard
Explanation:
A data hazard occurs when an instruction depends on the result of a previous instruction that has not yet completed. This can happen in pipelined systems when instructions are executed out of order or when data is not yet available in the pipeline. Techniques like forwarding and stalling are used to resolve data hazards.
Computer Instruction Set Complement
Complete Instruction Set Complement
Computer Indexed Set Components
Complex Instruction Set Computer
Answer: 4. Complex Instruction Set Computer
Explanation:
CISC stands for Complex Instruction Set Computer. It is a type of CPU architecture that uses a large set of complex instructions, each capable of performing multiple low-level operations. CISC architectures aim to reduce the number of instructions per program, but they can be more complex to implement.
CISC
RISC
ISA
ANNA
Answer: 2. RISC
Explanation:
RISC stands for Reduced Instruction Set Computer. RISC architectures focus on simplifying the instruction set, allowing each instruction to execute in a single clock cycle. This reduces the time of execution and improves performance, especially in pipelined systems.
Reduced number of addressing modes
Increased memory size
Having a branch delay slot
All of the mentioned
Answer: 3. Having a branch delay slot
Explanation:
A branch delay slot is a feature in RISC architectures where the instruction immediately following a branch instruction is executed before the branch takes effect. This helps to minimize pipeline stalls caused by branches, improving performance in pipelined systems.
Cost
Time delay
Semantic gap
All of the mentioned
Answer: 3. Semantic gap
Explanation:
The semantic gap refers to the difference between high-level programming languages and low-level machine instructions. Both CISC and RISC architectures aim to reduce this gap by providing instructions that align more closely with high-level operations, making programming easier and improving efficiency.
RISC
CISC
ISA
IANA
Answer: 1. RISC
Explanation:
Pipelining is a key feature of RISC architectures. RISC processors are designed with simpler instructions that can be executed in a single clock cycle, making them ideal for pipelining. This allows multiple instructions to be processed simultaneously, improving throughput and performance.
Register
Diodes
CMOS
Transistors
Answer: 4. Transistors
Explanation:
In CISC architectures, complex instructions are implemented using transistors on the CPU chip. These instructions are designed to perform multiple low-level operations in a single instruction, reducing the number of instructions needed for a program.
Immediate addressing
Register mode
Implied addressing
Register Indirect
Answer: 1. Immediate addressing
Explanation:
In immediate addressing, the operand is directly specified in the instruction itself. This means the value to be used is part of the instruction, and no additional memory access is required to fetch the operand.
Immediate addressing
Register mode
Implied addressing
Register Indirect
Answer: 2. Register mode
Explanation:
In register mode, the operand is placed in one of the CPU's general-purpose registers (e.g., 8-bit or 16-bit registers). This mode is faster than memory-based addressing because the data is already in the CPU's registers.
3
4
5
6
Answer: 1. 3
Explanation:
An offset in addressing modes is typically determined by adding up to three address elements: a base address, an index, and a displacement. This combination allows for flexible and efficient memory addressing.
TRUE
FALSE
Can be true or false
Cannot say
Answer: 1. TRUE
Explanation:
Zero-address instructions use implied addressing mode, where the operands are implicitly defined by the instruction itself. For example, in stack-based architectures, the operands are always on the top of the stack, so no explicit address is needed.
EA = 5 + R1
EA = R1
EA = [R1]
EA = 5 + [R1]
Answer: 1. EA = 5 + R1
Explanation:
In indexed addressing mode, the effective address (EA) is calculated by adding an offset (5 in this case) to the contents of a register (R1). The formula for the effective address is: EA=5+R1
Indexed with offset
Relative
Direct
Both indexed with offset and direct
Answer: 2. Relative
Explanation:
Relative addressing mode uses the Program Counter (PC) as a base register. The effective address is calculated by adding an offset to the current value of the PC. This mode is commonly used for branching and jump instructions.
Relative
Indirect
Index with Offset
Immediate
Answer: 1. Relative
Explanation:
Relative addressing mode is ideal for changing the normal sequence of instruction execution because it allows branching to a new address relative to the current Program Counter (PC). This is commonly used in loops and conditional jumps.
Positive number
Negative numbers
Infinity
Zero
Answer: 2. Negative numbers
Explanation:
Sign magnitude is a method of representing negative numbers in binary. The most significant bit (MSB) represents the sign (0 for positive, 1 for negative), and the remaining bits represent the magnitude of the number.
Positive number
FALSE
TRUE
Negative Number
Answer: 4. Negative Number
Explanation:
In sign magnitude representation, a sign bit of 1 indicates a negative number, while a sign bit of 0 indicates a positive number.
Zero voltage
Lower voltage level
Higher voltage level
Negative voltage
Answer: 3. Higher voltage level
Explanation:
In a positive logic system, a logic 1 is represented by a higher voltage level, while a logic 0 is represented by a lower voltage level. This is the standard convention in digital systems.
m full adders
m+1 full adders
m-1 full adders
m/2 full adders
Answer: 1. m full adders
Explanation:
An m-bit parallel adder consists of m full adders, one for each bit of the input numbers. Each full adder handles one bit of the addition, including the carry-in and carry-out for the next stage.
Input/Output Subsystem
Peripheral Devices
Interfaces
Interrupt
Answer: 2. Peripheral Devices
Explanation:
Peripheral devices are external devices connected to a computer, such as keyboards, mice, printers, and monitors. They provide input to or receive output from the computer system.
2
3
4
5
Answer: 2. 3
Explanation:
There are three main modes of I/O data transfer:
Programmed I/O: The CPU directly controls the data transfer.
Interrupt-driven I/O: The device interrupts the CPU when it is ready to transfer data.
Direct Memory Access (DMA): The device transfers data directly to/from memory without CPU intervention.
Interrupts
Memory mapping
Program-controlled I/O
DMA
Answer: 4. DMA
Explanation:
Direct Memory Access (DMA) offers the highest speed for I/O transfers because it allows devices to transfer data directly to/from memory without involving the CPU. This reduces CPU overhead and speeds up data transfer.
The I/O devices have a separate address space
The I/O devices and the memory share the same address space
A part of the memory is specifically set aside for the I/O operation
The memory and I/O devices have an associated address space
Answer: 2. The I/O devices and the memory share the same address space
Explanation:
In memory-mapped I/O, I/O devices and memory share the same address space. This means that I/O devices are accessed using the same instructions and addressing modes as memory, simplifying the programming model.
IBM
AT&T Labs
Microsoft
Oracle
Answer: 1. IBM
Explanation:
ISA (Instruction Set Architecture) is a standard developed by IBM to define the set of instructions that a CPU can execute. It serves as the interface between hardware and software.
Single Bus
USB
SCSI
Parallel BUS
Answer: 4. Parallel BUS
Explanation:
The SCSI (Small Computer System Interface) BUS is a parallel bus used to connect devices like hard drives, scanners, and video devices to a processor. It provides high-speed data transfer and supports multiple devices on the same bus.
16 bit
32 bit
64 bit
128 bit
Answer: 2. 32 bit
Explanation:
Many modern controllers use 32-bit registers to handle data and control signals efficiently. This allows them to process larger amounts of data and perform complex operations.
10
100
1000
10000
Answer: 3. 1000
Explanation:
Auxiliary memory (e.g., hard drives, SSDs) has a much slower access time compared to main memory (RAM). Typically, auxiliary memory access time is about 1000 times slower than main memory.
Hit/(Hit + Miss)
Miss/(Hit + Miss)
(Hit + Miss)/Miss
(Hit + Miss)/Hit
Answer: 1. Hit/(Hit + Miss)
Explanation:
The hit ratio is a measure of cache performance and is calculated as: Hit Ratio=Number of Hits+Number of MissesNumber of Hits A higher hit ratio indicates better cache performance.
Magnetic disks
Tapes
Flash memory
Both A and B
Answer: 4. Both A and B
Explanation:
Auxiliary memory includes storage devices like magnetic disks and tapes, which are used for long-term data storage. These devices are slower than main memory but have much larger storage capacities.
Cache
DRAM's
SRAM's
Registers
Answer: 4. Registers
Explanation:
Registers provide the fastest data access because they are located directly within the CPU. They are used to store data that is currently being processed, enabling extremely fast access times.
Secondary storage
Main memory
Register
TLB
Answer: 2. Main memory
Explanation:
The memory hierarchy typically follows this order: Registers → L1 Cache → L2 Cache → Main Memory (RAM) → Secondary Storage. After the L2 cache, the next level is main memory.
Complex Instruction Set Computer
Reduced Instruction Set Computer
ISA
ANNA
Answer: 1. Complex Instruction Set Computer
Explanation:
CISC (Complex Instruction Set Computer) processors often include multiclocks to handle complex instructions that may require multiple clock cycles to execute.
Complex Instruction Set Computer
Reduced Instruction Set Computer
ISA
ANNA
Answer: 2. Reduced Instruction Set Computer
Explanation:
RISC (Reduced Instruction Set Computer) processors primarily use register-to-register data transfer. This simplifies the instruction set and improves performance by reducing memory access.
The RISC processor has a more complicated design than CISC.
RISC Focus on software
CISC Focus on software
RISC has Variable sized instructions
Answer: 2. RISC Focus on software
Explanation:
RISC processors focus on software optimization by using a simpler instruction set. This allows compilers to generate more efficient code, improving overall performance.
CISC
ISA
RISC
ANNA
Answer: 3. RISC
Explanation:
RISC processors require more registers to support their register-to-register operations and reduce the need for memory access. This improves performance by keeping frequently used data in registers.
Semantic gap
Time Delay
Cost
Reduced Code
Answer: 1. Semantic gap
Explanation:
Both CISC and RISC architectures aim to reduce the semantic gap between high-level programming languages and low-level machine instructions. This makes programming easier and improves efficiency.
Micro programmed control unit is found in CISC.
Data transfer is from memory to memory.
In this instructions are not register based.
All of the above
Answer: 4. All of the above
Explanation:
CISC processors have the following characteristics:
They use a microprogrammed control unit.
They support memory-to-memory data transfer.
Instructions are not strictly register-based, allowing for more complex operations.
Register Memory
Cache Memory
Storage Memory
Virtual Memory
Answer: 2. Cache Memory
Explanation:
Cache memory is a small, high-speed memory located between the CPU and main memory. It stores frequently accessed data and instructions to reduce the time needed to access them from slower main memory.
True
False
Answer: 2. False
Explanation:
Cache memory is typically implemented using SRAM (Static RAM) chips, not DRAM (Dynamic RAM). SRAM is faster and more expensive, making it suitable for cache memory.
HIT
MISS
FOUND
ERROR
Answer: 1. HIT
Explanation:
When the CPU finds the required data in the cache memory, it is called a cache hit. This results in faster data access compared to a cache miss, where the data must be fetched from main memory.
Low Rate Usage
Least Rate Usage
Least Recently Used
Low Required Usage
Answer: 3. Least Recently Used
Explanation:
LRU (Least Recently Used) is a cache replacement policy where the least recently accessed data is replaced when the cache is full. This helps to keep the most frequently used data in the cache.
Unique
Inconsistent
Variable
Fault
Answer: 2. Inconsistent
Explanation:
When the data in the cache does not match the data in the main memory, the cache is said to be inconsistent. This can occur due to write operations that update the cache but not the main memory.
Write through
Write within
Write back
Buffered write
Answer: 2. Write within
Explanation:
The common write policies to maintain cache coherence are:
Write through: Data is written to both the cache and main memory simultaneously.
Write back: Data is written only to the cache and later written to main memory when the cache line is replaced.
Buffered write: Data is temporarily stored in a buffer before being written to memory.
Write within is not a valid write policy.
Snoopy writes
Write through
Write within
Buffered write
Answer: 1. Snoopy writes
Explanation:
Snoopy writes is an efficient method for cache updating in multiprocessor systems. It involves monitoring the bus for memory updates and invalidating or updating cache lines accordingly to maintain coherence.
Associative
Direct
Set Associative
Indirect
