IGCSE Information & Communication Technology Paper-1: Specimen Questions with Answers 20 - 21 of 46
Question 20
Appeared in Year: 2009
Describe in Detail Subjective▾
A floor turtle can use the following instructions:
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?
EditExplanation
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 21
Appeared in Year: 2009
Write in Short Short Answer▾
Which of the following components are required for video conferencing?
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