AQA Computer Science (8525) Paper 2
Questions And Answers
What bis bthe bname bof bnumbers bwith bbase-10? b- bcorrect banswers✔✔decimal
What bbase bis bbinary? b- bcorrect banswers✔✔Base-2
Why bdo bcomputers buse bbinary? b- bcorrect banswers✔✔Computers bonly bperform bthe
bfunction bof bturning bon bor boff belectrical bcharges; b1 brepresents belectricity bon
bwhereas b0 brepresents belectricity boff.
Why bis bhexadecimal bpreferred bover bbinary? b- bcorrect banswers✔✔simpler bto
brepresent ba bbyte bin b2 bdigits brather bthan b8, bless blikely bto bmake bmistakes, beasier
bto bremember
Convert b00100101 b- bcorrect banswers✔✔37
Convert b0100 bto bdecimal b- bcorrect banswers✔✔4
Convert b01010011 bto bdecimal b- bcorrect banswers✔✔83
Convert bFF bto bbinary b- bcorrect banswers✔✔11111111
Convert bFF bto bdecimal b- bcorrect banswers✔✔255
Convert bAE bfrom bhexadecimal bto bdecimal b- bcorrect banswers✔✔174
Convert bDB bfrom bhexadecimal bto bbinary b- bcorrect banswers✔✔11011011
A bbit bis bthe... b- bcorrect banswers✔✔fundamental bunit bof binformation
A bbit bis beither ba... b- bcorrect banswers✔✔1 bor b0
8 bbits bis bequal bto b- bcorrect banswers✔✔1 bbyte
1000 bbytes bis bequal bto b- bcorrect banswers✔✔1 bkilobyte
,1000 bkilobytes bis bequal bto b- bcorrect banswers✔✔1 bmegabyte
1000 bmegabytes bis bequal bto b- bcorrect banswers✔✔1 bgigabyte
1000 bgigabytes bis bequal bto b- bcorrect banswers✔✔1 bterabyte
00101100 b+ b10001101 b- bcorrect banswers✔✔010111001
A bbinary bshift bto bthe bleft bwill bdo bwhat bto bthe bnumber? b- bcorrect
banswers✔✔Multiply bit bby b2
A bbinary bshift bto bthe brightwill bdo bwhat bto bthe bnumber? b- bcorrect
banswers✔✔Divide bit bby b2
Do ba bbinary bshift bto bthe bleft bon bthe bbinary bnumber b00001011 b- bcorrect
banswers✔✔00010110
What bis ba bcharacter bset? b- bcorrect banswers✔✔A bcollection bof bcharacters bthat ba
bcomputer brecognises bfrom btheir bbinary brepresentation
What bdoes b"ASCII" bstand bfor? b- bcorrect banswers✔✔American bStandard bCode bfor
bInformation bInterchange
How bmany bbits bis bthe boriginal bASCII? b- bcorrect banswers✔✔7
How bmany bvalues bare bin bextended bASCII? b- bcorrect banswers✔✔255
What bhas breplaced bASCII bin bmost bcomputers? b- bcorrect banswers✔✔Unicode
What bis bthe bdefault bencoding bform bin bUnicode? b- bcorrect banswers✔✔16-bit
What bis bCODE_TO_CHAR(65)? b- bcorrect banswers✔✔A
Unicode buses bthe bsame bcodes bas bASCII bup bto b___ b- bcorrect banswers✔✔127
What bis bthe bbenefit bof bUnicode bover bASCI b- bcorrect banswers✔✔Unicode bcan
brepresent bmore bcharacters bthan bASCII, ballowing bfor bmore blanguages band bsymbols
bto bbe brepresented
Define bpixel b- bcorrect banswers✔✔A bsingle bpoint bin ban bimage
What bis bpixel bshort bfor? b- bcorrect banswers✔✔picture belement
How bdo bpixels brelate bto bimages? b- bcorrect banswers✔✔An bimage bis bmade bup bof
bpixels
, How bare bimages bdisplayed? b- bcorrect banswers✔✔They bare bdisplayed bas bmultiple
bpixels bwhich brepresent bthe bcolours bin bthe bimage
Define bcolour bdepth b- bcorrect banswers✔✔Colour bdepth bis bthe bnumber bof bbits
bused bto brepresent beach bpixel.
The bformula bfor bthe bsize bof ba bbitmap? b- bcorrect banswers✔✔width b* bheight
How bis bthe bfile bsize bof ban bimage bcalculated? b- bcorrect banswers✔✔width b* bheight
b* bcolour bdepth
How bdoes bthe bnumber bof bpixels bin ban bimage baffect bthe bfile bsize? b- bcorrect
banswers✔✔The bmore bpixels bin ban bimage, bthe bbigger bthe bfile bsize
Why bmust bsound bbe bconverted bby bcomputers? b- bcorrect banswers✔✔Sound bis
banalogue band bit bmust bbe bconverted bto ba bdigital bform bfor bstorage band bprocessing
bin ba bcomputer.
Define bsample bin bterms bof bsound b- bcorrect banswers✔✔a bmeasure bof bamplitude bat
ba bpoint bin btime.
Define bsampling brate b- bcorrect banswers✔✔Sampling brate bis bthe bnumber bof
bsamples btaken bin ba bsecond band bis busually bmeasured bin bhertz b(1 bhertz b= b1
bsample bper bsecond)
Define bsample bresolution b- bcorrect banswers✔✔Sample bresolution bis bthe bnumber bof
bbits bper bsample
How bdo byou bcalculate bsound bfile bsize? b- bcorrect banswers✔✔File bsize b(bits) b=
bsampling brate bx bsampling bresolution bx bnumber bof bseconds
Why bmight bsomeone bwant bto bcompress bdata? b- bcorrect banswers✔✔To bsave
bstorage bor bto bsend/load bthe bdata bquickly
What bare bthe btwo btypes bof bcompression? b- bcorrect banswers✔✔Lossy band blossless
bcompression
What bis bdata bcompression? b- bcorrect banswers✔✔Reducing bthe bamount bof bspace
bneeded bto bstore ba bpiece bof bdata
What bis bHuffman bcoding? b- bcorrect banswers✔✔Huffman bcoding bis ba blossless bdata
bcompression balgorithm.
How bdoes bHuffman bencoding bwork? b- bcorrect banswers✔✔The bidea bis bto bassign
bvariable-length bcodes bto binput bcharacters, blengths bof bthe bassigned bcodes bare
bbased bon bthe bfrequencies bof bcorresponding bcharacters. bThe bmost bfrequent
Questions And Answers
What bis bthe bname bof bnumbers bwith bbase-10? b- bcorrect banswers✔✔decimal
What bbase bis bbinary? b- bcorrect banswers✔✔Base-2
Why bdo bcomputers buse bbinary? b- bcorrect banswers✔✔Computers bonly bperform bthe
bfunction bof bturning bon bor boff belectrical bcharges; b1 brepresents belectricity bon
bwhereas b0 brepresents belectricity boff.
Why bis bhexadecimal bpreferred bover bbinary? b- bcorrect banswers✔✔simpler bto
brepresent ba bbyte bin b2 bdigits brather bthan b8, bless blikely bto bmake bmistakes, beasier
bto bremember
Convert b00100101 b- bcorrect banswers✔✔37
Convert b0100 bto bdecimal b- bcorrect banswers✔✔4
Convert b01010011 bto bdecimal b- bcorrect banswers✔✔83
Convert bFF bto bbinary b- bcorrect banswers✔✔11111111
Convert bFF bto bdecimal b- bcorrect banswers✔✔255
Convert bAE bfrom bhexadecimal bto bdecimal b- bcorrect banswers✔✔174
Convert bDB bfrom bhexadecimal bto bbinary b- bcorrect banswers✔✔11011011
A bbit bis bthe... b- bcorrect banswers✔✔fundamental bunit bof binformation
A bbit bis beither ba... b- bcorrect banswers✔✔1 bor b0
8 bbits bis bequal bto b- bcorrect banswers✔✔1 bbyte
1000 bbytes bis bequal bto b- bcorrect banswers✔✔1 bkilobyte
,1000 bkilobytes bis bequal bto b- bcorrect banswers✔✔1 bmegabyte
1000 bmegabytes bis bequal bto b- bcorrect banswers✔✔1 bgigabyte
1000 bgigabytes bis bequal bto b- bcorrect banswers✔✔1 bterabyte
00101100 b+ b10001101 b- bcorrect banswers✔✔010111001
A bbinary bshift bto bthe bleft bwill bdo bwhat bto bthe bnumber? b- bcorrect
banswers✔✔Multiply bit bby b2
A bbinary bshift bto bthe brightwill bdo bwhat bto bthe bnumber? b- bcorrect
banswers✔✔Divide bit bby b2
Do ba bbinary bshift bto bthe bleft bon bthe bbinary bnumber b00001011 b- bcorrect
banswers✔✔00010110
What bis ba bcharacter bset? b- bcorrect banswers✔✔A bcollection bof bcharacters bthat ba
bcomputer brecognises bfrom btheir bbinary brepresentation
What bdoes b"ASCII" bstand bfor? b- bcorrect banswers✔✔American bStandard bCode bfor
bInformation bInterchange
How bmany bbits bis bthe boriginal bASCII? b- bcorrect banswers✔✔7
How bmany bvalues bare bin bextended bASCII? b- bcorrect banswers✔✔255
What bhas breplaced bASCII bin bmost bcomputers? b- bcorrect banswers✔✔Unicode
What bis bthe bdefault bencoding bform bin bUnicode? b- bcorrect banswers✔✔16-bit
What bis bCODE_TO_CHAR(65)? b- bcorrect banswers✔✔A
Unicode buses bthe bsame bcodes bas bASCII bup bto b___ b- bcorrect banswers✔✔127
What bis bthe bbenefit bof bUnicode bover bASCI b- bcorrect banswers✔✔Unicode bcan
brepresent bmore bcharacters bthan bASCII, ballowing bfor bmore blanguages band bsymbols
bto bbe brepresented
Define bpixel b- bcorrect banswers✔✔A bsingle bpoint bin ban bimage
What bis bpixel bshort bfor? b- bcorrect banswers✔✔picture belement
How bdo bpixels brelate bto bimages? b- bcorrect banswers✔✔An bimage bis bmade bup bof
bpixels
, How bare bimages bdisplayed? b- bcorrect banswers✔✔They bare bdisplayed bas bmultiple
bpixels bwhich brepresent bthe bcolours bin bthe bimage
Define bcolour bdepth b- bcorrect banswers✔✔Colour bdepth bis bthe bnumber bof bbits
bused bto brepresent beach bpixel.
The bformula bfor bthe bsize bof ba bbitmap? b- bcorrect banswers✔✔width b* bheight
How bis bthe bfile bsize bof ban bimage bcalculated? b- bcorrect banswers✔✔width b* bheight
b* bcolour bdepth
How bdoes bthe bnumber bof bpixels bin ban bimage baffect bthe bfile bsize? b- bcorrect
banswers✔✔The bmore bpixels bin ban bimage, bthe bbigger bthe bfile bsize
Why bmust bsound bbe bconverted bby bcomputers? b- bcorrect banswers✔✔Sound bis
banalogue band bit bmust bbe bconverted bto ba bdigital bform bfor bstorage band bprocessing
bin ba bcomputer.
Define bsample bin bterms bof bsound b- bcorrect banswers✔✔a bmeasure bof bamplitude bat
ba bpoint bin btime.
Define bsampling brate b- bcorrect banswers✔✔Sampling brate bis bthe bnumber bof
bsamples btaken bin ba bsecond band bis busually bmeasured bin bhertz b(1 bhertz b= b1
bsample bper bsecond)
Define bsample bresolution b- bcorrect banswers✔✔Sample bresolution bis bthe bnumber bof
bbits bper bsample
How bdo byou bcalculate bsound bfile bsize? b- bcorrect banswers✔✔File bsize b(bits) b=
bsampling brate bx bsampling bresolution bx bnumber bof bseconds
Why bmight bsomeone bwant bto bcompress bdata? b- bcorrect banswers✔✔To bsave
bstorage bor bto bsend/load bthe bdata bquickly
What bare bthe btwo btypes bof bcompression? b- bcorrect banswers✔✔Lossy band blossless
bcompression
What bis bdata bcompression? b- bcorrect banswers✔✔Reducing bthe bamount bof bspace
bneeded bto bstore ba bpiece bof bdata
What bis bHuffman bcoding? b- bcorrect banswers✔✔Huffman bcoding bis ba blossless bdata
bcompression balgorithm.
How bdoes bHuffman bencoding bwork? b- bcorrect banswers✔✔The bidea bis bto bassign
bvariable-length bcodes bto binput bcharacters, blengths bof bthe bassigned bcodes bare
bbased bon bthe bfrequencies bof bcorresponding bcharacters. bThe bmost bfrequent
