Revision Paper Set - 14 YASASS CTI – The Computer Class Contact No : 0767247879, 0725102060, 0112827849 1 A Software Developer is using a microphone to collect various sounds for his new game. He is also using a sound editing app. When collecting sounds, the Software Developer can decide on the Sampling Resolution he wishes to use. (a) (i) What is meant by Sampling Resolution ? [2] .............................................................................................................................................................. .............................................................................................................................................................. .............................................................................................................................................................. (ii) Describe how Sampling Resolution will affect, how accurate the stored digitized sound will be ? ............................................................................................................................................................. ............................................................................................................................................................. ........................................................................................................................................................ [2] (b) The Software Developer will include images in his new game. (i) Explain the term Image Resolution. [3] ............................................................................................................................................................ ............................................................................................................................................................ ............................................................................................................................................................ (ii) The Software Developer is using 16-colour bitmap images. How many bits would be used to encode data for one pixel of his image ? ................................................................................. [1] (iii) One of his images is 16384 pixels wide and 512 pixels high. He decides to save it as a 256 colour bitmap image. Calculate the size of the image file in GiB. [5] ........................................................................................................................................................... ........................................................................................................................................................... ........................................................................................................................................................... ........................................................................................................................................................... ........................................................................................................................................................... ........................................................................................................................................................... ........................................................................................................................................................... ........................................................................................................................................................... 1 (c) Describe any file compression techniques the developer may use. [4] ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. 2 An 8 – bit register contains the value ; 0 0 1 1 0 1 1 0 (a) Write down the Denary value of this register. [1] ................................................................................................................................................................. (b) The contents of this register undergo a logical shift one place to the right. (i) Show the result of this right shift. [2] (ii) Write down the Denary value following this right shift. [1] ........................................................................................................................................................... (iii) State with reasons, the effect of this Left shift on the denary value in the original register. [3] .............................................................................................................................................................. .............................................................................................................................................................. .............................................................................................................................................................. .............................................................................................................................................................. .............................................................................................................................................................. (c) The contents of this register, at the start of the question, now undergo a logical shift two places to the right. (i) Show the result of this right shift. [2] 2 (ii) Write down the Denary value following this right shift. [1] ........................................................................................................................................................... (iii) State with reasons, the effect of this Right shift on the denary value in the original register. [4] .............................................................................................................................................................. .............................................................................................................................................................. .............................................................................................................................................................. .............................................................................................................................................................. .............................................................................................................................................................. 3 Describe following terms given below. (a) What is known as a Data Packet ? [3] ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. (b) What is called Packet Header ? [3] ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. (c) What is called Payload ? [1] ................................................................................................................................................................. (d) What is called Packet Trailer ? [2] ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. 3 (e) What is called Packet Switching ? [4] ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. (f) In Packet Switching what is known as a “Node” and explain the task of a Node ? [4] ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. (g) What is known as “hopping” ? [2] ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. (h) What is known as Real Time Streaming ? [3] ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. (i) What is known as a Parity bit ? [3] ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. (j) What is known as Parity Checking ? [3] ................................................................................................................................................................. ................................................................................................................................................................. 4 ................................................................................................................................................................. ................................................................................................................................................................. (k) What is known as Parity Block ? [2] ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. (l) What is called Check Sum ? [5] ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. (m) What is called Automatic Repeat Request ? [5] ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. (n) What is known as an acknowledgement ? [2] ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. (o) What is known as a “Timeout” in Data Transmission ? [2] ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. 5
