IGCSE Information & Communication Technology Paper-1: Specimen Questions with Answers 20 - 21 of 46

Question number: 20

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Appeared in Year: 2009

Essay Question▾

Describe in Detail

A floor turtle can use the following instructions:

Table of the Instruction and meaning

Instruction

Meaning

PENUP

Lift the pen

PENDOWN

Lower the pen

LEFT t

Turn left t degrees

RIGHT t

Turn right t degrees

FORWARD n

Move n mm forward

BACKWARD n

Move n mm backward

Write the set of instructions to draw this shape?

Instructions to draw this shape

Instructions to Draw this Shape

Explanation

Pendown

  • Left 90

  • Forward 20

  • Right 90

  • Forward 60

  • Right 90

  • Forward 120

  • Right 90

  • Forward 45

Penup

Forward 5

Pen down

  • Right 90

  • Forward 50

  • Left 90

Question number: 21

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Appeared in Year: 2009

Short Answer Question▾

Write in Short

Which of the following components are required for video conferencing?

Microphone and webcam

Microphone and Webcam

Table of the Microphone and webcam

Microphone

Mouse

DVD ROM

Joystick

Magnetic tape

Light pen

Magnetic ink characters

Digital camera

Optical marks

Trackball

Floppy disk

Webcam

Explanation

Microphone and webcam

The components of a video conferencing system include:

  • A network for data transfer, usually a high-speed broadband Internet connection, which uses similar technology as voice over Internet protocol (VoIP). Local area network (LAN) and integrated services digital network (ISDN) connections are occasionally used as well.

  • Two or more video cameras or webcams that provide video input.

  • Two or more microphones either located on the individual or within the device that provide audio input.

  • A computer screen, monitor, TV or projector that can broadcast video output.

  • Headphones, laptop speakers or professional speakers that can be used for audio output.

  • Hardware or software based coding and decoding technology, called codecs, which can compress analog audio and video (AV) data into digital packets on the distributing end and then decompress the data at the endpoint.

  • Acoustic echo cancellation (AEC) software which reduces audio delays and supports real time

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