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diff --git a/tests/1/questions.tex b/tests/1/questions.tex new file mode 100644 index 0000000..62e1106 --- /dev/null +++ b/tests/1/questions.tex @@ -0,0 +1,46 @@ +\begin{questions} + + \question Lucy records using her camera. The camera saves the + audio and video parts of the recording seperately. Lucy transfers + recording to her computer. The audio file has a size of 12.8 kB. + Audio is recorded at a sample rate of 320 kB per second. The audio + resolution is 32 bits. + + \begin{parts} + + \part[5] In minutes, how many seconds was the recording. + \vspace{\stretch{1}} + + \part[5] A video file consists of many still frames. Each + frame is a normal image. The size of a video file can + therefore be expressed as: + + \begin{align*} + \mbox{Video file size} = \mbox{Number of frames} \times + \mbox{Size of each frame} + \end{align*} + + If each frame is 1920 pixels wide and 1080 pixels high in + resolution, and the bit depth of 24 bits, what is the file + size of the video file. + \vspace{\stretch{1}} + + \pagebreak + + \part[1] Lucy combines the audio and video to form a file. She + then runs a lossy compression algorithm on the resulting file. + What is lossy compression? + \vspace{\stretch{1}} + + \part[3] The file size after compression is reduced by 20\%. + What is the final file size? + \vspace{\stretch{1}} + + \part[1] State an assumption made for part (d). + \vspace{\stretch{1}} + + \end{parts} + \droptotalpoints + +\end{questions} + |