IGCSE Computer Science Paper-1: Specimen Questions with Answers 79 - 82 of 164

Question 79

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Short Answer▾

Name the following network topologies:

The Network Topologies

Explanation

The first topology is that of a star network and the second is that of bus network.

  • In a star network topology every host is connected to a central hub.
  • In a bus network topology there is one main cable to which all the other nodes are directly connected.

Question 80

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Give two differences between Flash Memories and CD-RWs.

Explanation

In Flash Memory data is electronically reprogrammed and erased whereas in CD-RWs data is not electronically programmed rather it is re-written.

Flash Memory is non-volatile chip whereas CD-RW (Compact Disc-Rewritable) is a digital optical disc.

Question 81

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Short Answer▾

List two benefits of using a computerized traffic control systems.

Explanation

The Computerized traffic control system facilitates increased efficiency and time management thereby performing the accounting functions more rapidly.

The retrieval, storage and sorting of data becomes easier and quicker along with improved billing accuracy and completeness.

Question 82

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Short Answer▾

What are some of the sensors that can be used in vehicles to avoid collision?

The Figure Show Two Vehicles

Explanation

There are several common and promising systems that can be used on vehicles to avoid collision:

  • Forward collision avoidance system: This includes sensors like cameras, RADAR or LIDAR to alert the driver when the vehicle is getting close to another vehicle in front of it. This system is provided with autonomous braking which reduces the speed of the vehicle thereby mitigating the effect of collision.
  • Adaptive Headlights: These headlights alert drivers to visualize the vehicle movement on dark and curved roads. The headlight illuminates the road ahead based on the vehicle՚s speed and steering wheel movement.
  • Lane departure warning and prevention system: In this system cameras are installed to track the position of the vehicle within the lane alerting the driver about any such danger being faced.
  • Curve speed warning system: This system uses a global positioning system or a digital map. This alerts the driver in case the vehicle is approaching any curve at an over speed.

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