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Public Service Commission Examination Computer Operator 2013 1. A small or intelligent device is so called because it contains within it a a. Computer b. Microcomputer c. Programmable d. Sensor Correct Answer: Sensor 2. Each IP packet must contain a. Only source address b. Only destination address c. Source and destination address d. Source or destination address Correct Answer: Source and   destination address 3. The two basic types of record access methods are a. Sequential and random b. Sequential and indexed c. Direct and immediate d. Online and realtime Correct Answer: Sequential and random 4. Which of the following memories needs refresh a. SRAM b. DRAM c. ROM d. All of above Correct Answer: DRAM 5. First Generation computers used to have processing speed in a. Microsecond b. Millisecond c. Nanosecond d. Picosecond Correct Answer: Millisecond 6. USB stands for a. Unique serial bus b. Unique save data...

What is Logic Gates? Introduction Logic gates serve as the building blocks to digital logic circuits using combinational logic. We're going to consider the following gates: NOT gates (also called inverters), AND gates, OR gates, NAND gates, NOR gates, XOR gates, and XNOR gates. We'll also discuss the concept of gate deltay. NOT gates NOT gates or inverters have a single bit input and a single bit of output. This is a diagram of a NOT gate. It is a triangle with a circle on the right. The circle indicates "negation". The truth table defines the behavior of this gate.   x     z   0 1 1 0 where x is the input and z is the output. AND 2 gates AND 2 gates have two bits of input and a single bit of output. The subscript, 2, indicates how many inputs this AND gate has. For example, AND 3 gates have 3 inputs. The output of AND 2 gate is 1 only if both inputs are...