Multiple choice questions on digital logic circuits, computer architecture, and binary arithmetic.

Here are the answers to the multiple-choice questions: 1. A Combinational circuit is a type of digital circuit whose output depends only on? A combinational circuit's output is determined solely by its current inputs, without any memory of past inputs. The correct answer is B. 2. The amount of time required to read a block of data from a disk into memory is composed of seek time, rotational latency time and transfer time. Rotational latency refers to? Seek time is the time taken for the read/write head to move to the correct track. Rotational latency is the time taken for the desired sector on the platter to rotate under the read/write head. Transfer time is the time taken to actually read or write the data. The correct answer is C. 3. What characteristic of RAM memory makes it NOT suitable for permanent storage? RAM (Random Access Memory) is volatile, meaning it requires power to maintain the stored information. When the power is turned off, the data is lost. This makes it unsuitable for permanent storage. The correct answer is C. 4. What is result of the following in sign-absolute notation? 0110100 - 01001100. Step 1: Convert the binary numbers to decimal. The first bit represents the sign (0 for positive, 1 for negative). The remaining bits represent the magnitude. For 0110100: Sign bit is 0, so it's positive. Magnitude is 110100_2 = 1 · 2^5 + 1 · 2^4 + 0 · 2^3 + 1 · 2^2 + 0 · 2^1 + 0 · 2^0 = 32 + 16 + 4 = 52_10. So, 0110100 = +52_10. For 01001100: Sign bit is 0, so it's positive. Magnitude is 1001100_2 = 1 · 2^6 + 0 · 2^5 + 0 · 2^4 + 1 · 2^3 + 1 · 2^2 + 0 · 2^1 + 0 · 2^0 = 64 + 8 + 4 = 76_10. So, 01001100 = +76_10. Step 2: Perform the subtraction. +52_10 - (+76_10) = 52 - 76 = -24_10 Step 3: Convert the result back to sign-absolute notation. The result is -24_10. The sign bit for a negative number is 1. The magnitude of 24 in binary: 24 ÷ 2 = 12 remainder 0 12 ÷ 2 = 6 remainder 0 6 ÷ 2 = 3 remainder 0 3 ÷ 2 = 1 remainder 1 1 ÷ 2 = 0 remainder 1 Reading remainders from bottom up: 11000_2. To match the 8-bit format of the options, the 7-bit magnitude for 24 is 0011000_2. Combining the sign bit and magnitude: 10011000_2. Comparing with the options: A. 00101000 = +40_10 B. 10101000 = -40_10 C. 00010100 = +20_10 D. 10011000 = -24_10 The correct answer is D. 5. An Example of universal gate A universal gate is a logic gate that can implement any Boolean function without the need for any other gate type. NAND and NOR gates are universal gates. The correct answer is C. Send me the next one 📸