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7/24/2019 Xii Year Phy Grand Test
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The Professors Academy
HE PROFESSORS ACADEMY
Darakhshan CampusTEST
XII PhysicsCourse Instructor: Waleed Ahmed Khan Time:2 Hours
NOTE: ATTEMPT ALL THE QUESTIONS
Q1 M.C.QS
1 !n the "ahrenheit scale a temperature o# $2%C &ill I
'erecorded as appro(imately:
(a) 10(b) 30 (c) 40 (d) 1052 A chan)e in temperature o# 2* Co is
e+ui,alent to a chan)e in
temperature on the "ahrenheit scale o# appro(imately:(a) 0.9 (b)
20K (c) 6.7 (d) 36
- I# .T / 2*%C0 then in Kel,in scale .T /(a) 0K (b) 20K (c) 293K
(d) 200K
I# the ,olume o# a )as is dou'led &ithout chan)in)
itstemperature0 its pressure is:(a) reduced to of original value
(b) reduced to of original value
(c) not c!anged (d) double The ,olume o# a )i,en mass o# a )as
&ill 'e dou'led at
atmospheric pressure0 i# its temperature is chan)ed #rom2*%C
to:(a) 300" (b) 423" (c) 573" (d) 600"
3 All o# the #ollo&in) e(press appro(imately the same
pressuree(cept:(a) 1 at# (b) 15 lb$in2 (c) 15lb$ft2 (d) 30 in
%g
4 The chan)ed o# state #rom solid to li+uid is called:
(a) va&ori'ation (b) fuion (c) diuion (d) none of t!ee5 The
heat supplied or remo,ed &hich causes a chan)e o# state
&ithout a chan)ed in temperature is called:(a) latent !eat
(b) latent !eat of va&ori'ation(c) &eci*c latent !eat(d)
none of t!ee
6 At the meltin) point any #urther supplied heat ener)y is
usedto o,ercome the attracti,e #orces that hold the molecules
in7(ed positions in a solid That is &hy:(a) +inetic energ, of
#olecule doe not increae
(b) t!e #olecule ac-uired #ore &otential energ, and are able
to lide
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7/24/2019 Xii Year Phy Grand Test
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The Professors Academy
over one anot!er and !ence olid li-ue*e(c) t!e te#&erature
doe not rie (d) all of t!ee
1* The 8I unit o# speci7c latent heat o# #usion is:(a) (b) / (c)
$+g (d) $+g/K
11 The phenomenon o# #ree9in) o# ice &ith increase in
pressureand then re#ree9in) 'y remo,al o# pressure is kno&n
as:(a) va&ori'ation (b) condenation (c) regelation (d) none
oft!ee
12 The product o# molecular &ei)ht and speci7c heat is
called:(a) !eat ca&acit, (b) &eci*c !eat (c) #olar
&eci*c !eat (d)none of t!ee
1- The de,ice used in method o# mi(tures is:(a) baro#eter (b)
volt#eter (c) t!er#o#eter (d) calori#eter
1 olt9mann;s constant is related to uni,ersal )as constantand
A,o)adro;s no 'y:
(a) (b) (c) (d) none of t!ee15.The speci7c heat at constant
pressure is al&ays )reater than
the speci7c heat at constant ,olume 'ecause:(a) t!e ecienc, at
contant &reure i greater(b) onl, a contant &reure i
reverible(c) t!e contant &reure &roce i
Q2 (a)Deri*e the e+ression: P = 1/3 V-2
(b)+y-en -as is resent in a tank o' *ol.e 112c3at initial
ress.re 2at and
ha*in- a ass o' 0k- hen ress.re is increased . to 0at ho .ch ass
o' the -as
can be inserted into the tank!
Q3 (a)rite a short note on Bietallic therostat and Bi etallic
theroeter!
(dra d!a"ra#$ %&r& '&&$ar)
(b) A -lass 'lask contains c3o' erc.ry at 3#o hen the 'lask and
its contents are
heated . to %#o
!4ind ho .ch erc.ry ill be abo*e the ark!5erc.ry 1%2+1#
$6$1 , 7-lass8+1#$6$1
Q* (a) De'ine 4irst 9a o' herodynaics and aly it on a syste
ha*in- no
in*ol*eent o' heat!
(b) ;' teerat.re o' hot reser*oir o' a carnot en-ine is 6K and
it is desired to
increase its e''iciency 'ro &&< to 6&< ho .ch
de-ree the teerat.re o' cold
reser*oir be decreased=
Address: 31/216, Darakhshan Society, Malir Kalaboard, Behind
Nehal Hosital, Karachi! "hone: #332$33%&161
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7/24/2019 Xii Year Phy Grand Test
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The Professors Academy
ALLAH THE ALL MIGHTY ;HELP THOSE WHO HELP THEMSELVES
Address: 31/216, Darakhshan Society, Malir Kalaboard, Behind
Nehal Hosital, Karachi! "hone: #332$33%&161
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