Organization, CPU, I/O Devices Questions with Solutions
This topic covers how a computer is organised internally and how it communicates with the outside world. The central processing unit (CPU) has three main parts: the arithmetic logic unit (ALU), which performs calculations and comparisons; the control unit (CU), which directs operations; and registers, which hold data temporarily. The topic also covers the system bus (data, address and control buses), the motherboard, and clock speed. Input and output (I/O) devices are the other main part. Input devices include the keyboard, mouse, scanner, microphone, OCR, OMR, MICR and barcode readers. Output devices include monitors, printers (impact and non-impact), plotters and speakers. Exam questions often ask you to classify a device as input, output or both (such as a touchscreen), or to identify which device is used for a particular purpose, such as MICR for bank cheques. Practise the CPU and I/O device questions below. Each answer includes an explanation.
- Q61.
Information travels between components on the motherboard through
A. Flash memoryB. CMOSC. PortsD. BuseseasyAsked in TCS ExamView solution › - Q62.
When a computer is turned on, where does it get the first instructions that it loads into RAM?
A. From RAMB. From ROMC. From the Hard DiskD. From a CDeasyAsked in TCS ExamView solution › - Q63.
What is the name for a thin credit card size device used principally on laptop to expand capabilities?
A. Expansion cardB. Flash cardC. PC cardD. Smart cardmediumAsked in TCS ExamView solution › - Q64.
Which of the following refers to an upside down mouse?
A. TrackpadB. JoystickC. TrackballD. Track pointeasyAsked in TCS ExamView solution › - Q65.
Which of the following is not an example of output device?
A. SpeakerB. PlotterC. MicrophoneD. PrintereasyAsked in TCS ExamView solution › - Q66.
Which of the following is hardware?
A. AssemblerB. ServerC. CompilerD. InterpretereasyAsked in TCS ExamView solution › - Q67.
Which of the following units is used to supervise each instruction in the CPU?
A. Control unitB. AccumulatorC. ALUD. Control RegistereasyAsked in NIMCET 2012View solution › - Q68.
For I/O mapped I/O:
A. Memory and I/O addresses are distinctB. Not all data transfer instructions can be used for I/OC. Both (A) and (B)D. None of thesemediumAsked in NIMCET 2010View solution › - Q69.
Why is the width of a data bus so important to the processing speed of a computer?
A. The narrower it is, the greater the computer's processing speed.B. The wider it is, the more data can fit into the main memory.C. The wider it is, the greater the computer's processing speed.D. The wider it is, the slower the computer's processing speed.easyAsked in NIMCET 2009View solution › - Q70.
On receiving an interrupt from an I/O device, the CPU:
A. hands over the control of the address and data bus to the interrupting device.B. branches off to the interrupt service subroutine immediately.C. branches off to the interrupt service subroutine after completion of the current instruction.D. None of the above.easyAsked in NIMCET 2009View solution › - Q71.
To access the I/O devices, the status flags are continuously checked in
A. Program controlled I/OB. Memory mapped I/OC. I/O MappedD. None of the aboveeasyAsked in NIMCET 2021View solution › - Q72.
If a processor clock is rated as 2500 million cycles per second, then its clock period is
A. secB. secC. secD. None of the aboveeasyAsked in NIMCET 2022View solution › - Q73.
Which of the following interfaces performs the transfer of data between the memory and the I/O peripheral without involving the CPU?
A. DMAB. Serial interfaceC. Branch interfaceD. DDAeasyAsked in NIMCET 2024View solution › - Q74.
Which of the following does not affect CPU performance?
A. Number of coresB. Cache sizeC. Amount of RAMD. Clock speedeasyAsked in NIMCET 2024View solution › - Q75.
Consider a system running under two types of workloads: (a) CPU-intensive jobs and (b) I/O-intensive jobs. Which of the following statements about programmed I/O and interrupt-driven I/O is correct?
A. Programmed I/O performs better for CPU-intensive jobs, while interrupt-driven I/O performs better for I/O-intensive jobs.B. Programmed I/O performs better in both CPU-intensive and I/O-intensive workloads because it gives the CPU full control.C. Interrupt-driven I/O performs better in both CPU-intensive and I/O-intensive workloads because it always reduces CPU involvement.D. Interrupt-driven I/O performs better for CPU-intensive jobs by freeing the CPU, while programmed I/O performs better for I/O-intensive jobs due to tighter control.mediumAsked in NIMCET 2025View solution ›