Question 1: 1. The method of accessing the I/O devices in which the CPU checks status bits periodically until it finds that the operation is complete. a) Programmed I/O b) Interrupt driven c) direct memory access d) None of the mentioned 2. In Direct Memory Access transfers, the required signals and addresses are given by the a) Processor b) Device drivers c) DMA controllers d) The program itself 3. Consider a memory 1Mx8, the number of address lines is a) 20 b) 21 c) 10 d) 1 4. When transferring data between cpu \& external device, CPU asks the I/O module to check the device status a) True b) False