8/12/2019 Half Yearly Question Paper Info ClassXII SETB

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DELHI PUBLIC SCHOOL GHAZIABAD

HALF YEARLY EXAMINATION -2012

INFORMATICS PRACTICES (CLASS- XII)

SET-B

TIME ALLOWED: 3 HOUR MM !0

8/12/2019 Half Yearly Question Paper Info ClassXII SETB

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N"#$ 1 A%&'$ #$ *"++"',% ./$,"%& *#$ $*/++ $,% #$ #$4#

2 M5& $ ,6$% ,% *"%# "* $ ./$,"%

1 A%&'$ #$ *"++"',% ./$,"%&:

(a) Write the purpose of the following:-(i) Repeater (ii) Router

(b)

(c)

Write the full forms of the following:-

(i) FTP (ii) FSF (iii)G! (i") F#$SS%ompare an& contrast coa'ial an& optical fiber cable

(&) What is *enial of Ser"ice+ ,ow &oes it affect nternet access+

(e) *efine P a&&ress in computer networ.ing+ Gi"e two characteristics

(f) *istinguish between open source software an& proprietar/ software with respect to licensingcost an& securit/

2 A%&'$ #$ *"++"',% ./$,"%&:

(a) Which transmission me&ium shoul& be use& to transfer &ata across two continents at "er/ highspee&+

(b) Write a short note on firewall

(c) #ist the main &ifference between client an& ser"er computer machine(&) ame an/ two enco&ing use& for n&ian #anguage computing

(e) 0rrange the following communication channels in ascen&ing or&er of their &ata transmission

rates

thernet %able2 $ptical Fiber2 Telephone %able2 %o-a'ial %able

3 A%&'$ #$ *"++"',% ./$,"%&:

(a) State True or False:-

(i) 0 relation create& in 3/S4l can contain more than one %an&i&ate 5e/(ii) n an R*63S Referential ntegrit/ can be maintaine& using Foreign 5e/

(b) 'plain an/ two string functions with e'ample in 37S8#

(c) Write a comman& in 37S8# to &ispla/ first four characters of the string 9 03 T, 6ST(&) What is the purpose of *%# comman&s in 37S8#+

(e) *efine %artesian Pro&uct

(f) Which .e/wor& is use& to remo"e &uplicate rows from the result set of a select 4uer/+(g) ame the function which is use& to get the current time in 3/S8#

(h) What is null "alue in 3/S8# &atabase+ %an /ou use nulls in arithmetic e'pressions+

(i) Write the main &ifference between count(attribute name)an& count(;)function

(D

(&) W# ',++ 9$ #$ "/#8/# "* #$ ,6$% 8" 9$+"': -int a = E>

while(a=@)

A if (a?H ==@)

a = aI1> D