IGCSE Computer Science - ch. 3 hardware

Which of the following is an input device?

• Loudspeaker

• Printer

• Mouse

• Projector

What is the purpose of a QR code?

• Storing URLs or other information for reading by the camera on a smartphone

• Storing video files for playback

• Storing contact information for business cards

• Storing music files for sharing

What is the main advantage of robotics?

• Robots can only perform one task repeatedly

• Robots can replace workers and lead to unemployment

• Robots can reduce human error and work efficiently

• Robots can think and make decisions independently

What is the main function of a barcode scanner?

• Scanning and converting images into electronic form

• Scanning and reading information stored in barcodes

• Controlling a central heating system

• Converting analog signals to digital codes

what is the difference between CPU and microprocessor?

• The microprocessor is not a necessary component of a computer
• different task coverage

• The CPU is larger than the microprocessor
• The CPU and microprocessor are the same thing

what does it mean when a cpu has 3GHz of speed?

• It means the processor can perform 3 million cycles per second.
• It means the processor can perform 3 thousand cycles per second.
• It means the processor can perform 3 trillion cycles per second.
• It means the processor can perform 3 billion instruction per second.

what factors determine CPU speeds?

• Clock speed
• Hard drive capacity
• cache

• Core

draw a Von Neumann structure CPU

where the next instruction located in CPU?

• Instruction register (IR)
• Arithmetic Logic Unit (ALU)
• Memory Address Register (MAR)
• Program Counter (PC)

what instruction MAR has?

• Central Processing Unit
• Input/Output
• Random Access Memory
• Memory Address in RAM