Download Electronics Quiz: Number Systems, Logic Gates, and Microprocessors and more Exams Technology in PDF only on Docsity!
Question 1. Which number system uses base 2? A) Decimal B) Hexadecimal C) Binary D) Octal Answer: C Explanation: The binary number system is base 2, utilizing only two digits: 0 and 1. Question 2. Convert the decimal number 45 to hexadecimal. A) 2D B) 3D C) 2E D) 3E Answer: A Explanation: 45 in decimal converts to 2D in hexadecimal because 45 divided by 16 is 2 with a remainder of 13 (D). Question 3. In sign-magnitude representation, what does the most significant bit (MSB) indicate?
A) Magnitude B) Sign (positive or negative) C) Two's complement value D) Error detection Answer: B Explanation: In sign-magnitude representation, the MSB indicates the sign: 0 for positive, 1 for negative. Question 4. Which code is used to decode decimal digits into a 4-bit binary form? A) Gray code B) BCD (Binary Coded Decimal) C) Excess-3 code D) Parity code Answer: B Explanation: BCD encodes decimal digits into 4-bit binary equivalents, allowing easy decimal-binary conversions. Question 5. Which Boolean law states that A + A' = 1? A) Identity law
C) NAND gate D) XOR gate Answer: C Explanation: NAND gates are universal; any Boolean function can be implemented using only NAND gates. Question 8. Which Karnaugh map minimization method is suitable for simplifying expressions with don't care conditions? A) Quine-McCluskey B) Truth table method C) K-map with X's D) Boolean algebra Answer: C Explanation: K-maps can incorporate don't care conditions using 'X's to optimize minimization. Question 9. In a half-adder, what is the purpose of the carry-out? A) To store sum B) To indicate overflow C) To generate the sum
D) To handle carry from previous addition Answer: B Explanation: The carry-out in a half-adder indicates overflow beyond the current bit, useful for multi-bit addition. Question 10. What type of circuit is used to compare two binary numbers and determine which is greater? A) Multiplexer B) Comparator C) Encoder D) Decoder Answer: B Explanation: A comparator circuit compares two binary numbers and outputs signals indicating their relative values. Question 11. Which hazard is characterized by an unwanted change in output due to differing propagation delays? A) Static hazard B) Dynamic hazard C) Glitch
Answer: A Explanation: The D flip-flop's next state (Q+) equals the input D, making it simple to implement data storage. Question 14. In a synchronous counter, how are flip-flops triggered? A) By external asynchronous signals B) On the rising or falling edge of the clock C) By data input only D) Randomly Answer: B Explanation: Synchronous counters trigger all flip-flops simultaneously on clock edges, ensuring synchronized operation. Question 15. Which type of register shifts data in only one direction? A) Bidirectional register B) Shift register C) Universal shift register D) Parallel register Answer: B
Explanation: A shift register moves data either left or right, depending on its configuration, but in one direction at a time. Question 16. Which counter type cycles through a sequence of states in a circular manner? A) Johnson counter B) Ring counter C) Asynchronous counter D) Up/down counter Answer: B Explanation: A ring counter cycles through states where only one flip-flop is set at a time, forming a circular sequence. Question 17. In a microprocessor architecture, the register used to temporarily hold data during arithmetic operations is called: A) Program Counter (PC) B) Accumulator C) Memory Address Register (MAR) D) Stack Pointer Answer: B
Explanation: Indexed addressing mode adds the contents of an index register to a base address to find the effective memory location. Question 20. Which type of computer architecture emphasizes simplicity and speed by reducing instruction complexity? A) CISC B) RISC C) VLIW D) Superscalar Answer: B Explanation: RISC (Reduced Instruction Set Computing) architecture uses simple instructions executed quickly. Question 21. Booth's algorithm is used for which arithmetic operation? A) Addition B) Subtraction C) Multiplication D) Division Answer: C
Explanation: Booth's algorithm efficiently multiplies binary numbers by reducing the number of necessary addition/subtraction steps. Question 22. The IEEE 754 floating-point standard represents numbers with a sign, exponent, and significand. What is the main advantage of this standard? A) Fixed precision B) Uniform representation of a wide range of values C) Simplifies integer calculations D) Eliminates the need for normalization Answer: B Explanation: IEEE 754 standard provides a uniform way to represent and perform operations on floating-point numbers over a wide range. Question 23. In a memory hierarchy, which component has the fastest access time? A) Cache B) Main memory C) Secondary storage D) Registers Answer: D
Explanation: Paging allows the system to use disk space as an extension of RAM, enabling larger address spaces than physical memory alone. Question 26. Which technique is used to translate virtual addresses to physical addresses efficiently? A) Page replacement B) TLB (Translation Lookaside Buffer) C) Segmentation D) Cache mapping Answer: B Explanation: TLB caches recent address translations, speeding up virtual-to- physical address conversion. Question 27. In programmed I/O, how is data transferred between CPU and peripheral device? A) Automatically using DMA B) Under software control via polling C) Using interrupt signals D) Using dedicated hardware channels Answer: B
Explanation: Programmed I/O relies on the CPU actively polling or controlling data transfer through software instructions. Question 28. Which I/O technique involves a peripheral device directly transferring data to/from main memory without CPU intervention? A) Programmed I/O B) Interrupt-driven I/O C) DMA (Direct Memory Access) D) Polling Answer: C Explanation: DMA allows peripherals to transfer data directly to/from memory, freeing the CPU for other tasks. Question 29. The function of a Programmable Interrupt Controller (PIC) like 8259A is to: A) Generate clock signals B) Manage multiple hardware interrupts C) Control memory access D) Perform arithmetic operations Answer: B
Explanation: Hexadecimal is compact and human-friendly for representing binary data in digital displays. Question 32. Which Boolean identity states that A + A = A? A) Idempotent law B) Null law C) Complement law D) Distributive law Answer: A Explanation: The idempotent law states that OR or AND of a variable with itself yields the same variable. Question 33. The expression A'B + AB' represents which logic function? A) AND B) OR C) XOR D) XNOR Answer: C Explanation: A'B + AB' is the Boolean expression for XOR, which outputs true when inputs differ.
Question 34. Which logic gate is the complement of the OR gate? A) NOR B) NAND C) XOR D) XNOR Answer: A Explanation: NOR is the complement of OR; it outputs true only when both inputs are false. Question 35. Which minimization technique is best suited for functions with many variables and don't care conditions? A) Karnaugh map B) Boolean algebra C) Quine-McCluskey method D) Truth table Answer: C Explanation: Quine-McCluskey algorithm systematically handles multiple variables and don't care conditions for minimization.
B) A sequential state with associated actions C) A hardware gate D) A memory cell Answer: B Explanation: States in an ASM chart represent different sequential conditions with corresponding actions and transitions. Question 39. Which component is used to temporarily store data during instruction execution in a CPU? A) Cache B) Register C) Bus D) ALU Answer: B Explanation: Registers temporarily hold data and instructions during processing within the CPU. Question 40. The primary purpose of the Control Unit in a CPU is to: A) Perform arithmetic operations B) Manage data flow and control signals
C) Store program data D) Handle I/O operations directly Answer: B Explanation: The Control Unit directs data movement and manages control signals to coordinate CPU activities. Question 41. Which instruction format uses no explicit address field? A) Zero address B) One address C) Two address D) Three address Answer: A Explanation: Zero address instructions rely on stack-based operations without explicit addresses, typical in stack architectures. Question 42. In the 8086 microprocessor, the segment registers are used to: A) Store data B) Segment memory into different regions C) Hold the program counter D) Store flags
