PHYSI

CS
May2020

IMMACULATEHEARTGI RLS’SCHOOL–NYAKI BALE

S.4PHYSI CS–GUI DI
NGQUESTI ONS
1.(a)Def inethet erms
(i
) Heat
(i
i) Temper ature
(i
ii
) Ther momet er
(
b)(i)St at
ethr eeef f
ectsofheartonabody .
(
ii
)Def inethet ermsLowerandUpperf ixedpoint
s.
(
ii
i)Describebr i
eflyhowt hel
owerandupperf i
xedpointscanbe
determined
insepar ateexperiments.
(
c)Onagast her momet er,t
hetemperat
urewasshownas600mm ati ce
pointand
820mm atst eam point.I
f655mm ofmer cur
ycorrespondsto
temperatureQ,
calculatethev alueofQ.

2.(
a)Def i
net hermomet r
icpr oper
ty.
(
b)St at
ef ourquali
ti
esofagoodt her momet ricli
qui
d.
(
c)St at
eadv antagesofmer cur
yov eralcohol asather
momet r
icli
qui
d.
(
d)St at
eadv antagesofal coholovermer cur
yasat her
momet r
icli
qui
d.
(
e)St at
er easonswhywat ercannotbeusedast her
momet r
icl
iqui
d.
(
f)Dr awandl abel
(i)simpleliqui
d-i
n-glassthermomet er
(
ii)cl
ini
cal t
hermomet er.
(
g)Descr i
bet hefeaturesofal i
qui
d- i
n-glassthermometerandexplai
nhow
i
ts
sensit
ivi
tycanbei ncreased.

3.(
a)Def
inet
hef
oll
owi
ngt
ermsasappl
i
edt
oheatt
ransf
er:
 (
i) Conduct i
on
(
ii
) Conv ecti
on
(
ii
i) Radi
ation

(b)Disti
nguishbetweenbadandgoodconduct orsofheatandgi v
e
exampl esof
each.
(c)Describeasimpl eexperi
menttocompar ether
mo- conducti
v i
tyof
various
materi
als.
(d)Describeanexper i
mentt oshowthatconvecti
ontakesplacei nliquids.
(e)Describewiththeai dofadiagr
am anexperimenttoshowt hatwat eris
abad
conductorofheat.
(f)Stat
eandexpl aintheeffect
sandappli
cationsofconv ect
ioninf l
uids.
(g)Describethestructureandmodeofactionofav acuum flask.

4.(
a)Stategasl aws.
(
b)Descr ibehowChar l
es’l
awcanbev er
ifi
ed.
(
c)Whati smeantbyabsol ut ezero?
(
d)Thev olumeofaf i
xedmassofagasatconst antpressurei
stri
pledas
i
ts
temper aturei
ncreasesfrom 0oC.Det erminethefi
naltemperatur
eof
t
hegas.
(
e)Distinguishbetweensat uratedandunsat urat
edvapour.
(
f)Disti
ngui shbetweensatur at
edv apourpressureandunsaturat
edv apour
pressur e.
(
g)St at
et hef act
orsthataf
f ectboil
ingpointofagivenli
quid.

5.(a)Statethel awsofr ef
racti
onofl i
ght .
(b)Descr i
behowt herefr
activeindexofgl assinform ofaglassblockcan
be
determined.
(c)Ar ayofl i
ghttrav
elli
ngf r
om airtogl assi sref
ract
ionatanangl eof35o.
I
ft he
ref
racti
vei ndexofglassis1. 52,calculatetheangleofincidence.
(d)Def i
net hetermsfocal pointandf ocal l
engthasappl i
edtolenses.
(e)Descr i
bebr i
efl
yhowal enscamer awor ks.
2
 (
f)Stat
ethedi
ffer
encesandsimil
ari
ti
esbetweenalenscameraandaney
e.
(
g)(i
)Defi
nepowerofal ens.
(i
i
)Adiver
ginglenshasafocall
engthof20cm.Calcul
atei
tspower
.

6.(a)Stat
et heNewt on’slawsofmot i
on.
(b)Defi
net heter m moment um.
(c)(i
)Statet hel awofconser v ati
onofl inearmoment um.
(
ii
)Distinguishbet weenel asticandinel asticcoll
isions.
(i
ii
)Abal lofmass5kgmov ingwi thav elocityof10ms-1makesaheadon
col
lisionwi t
hanot herbal lofmass2kgwi t
hav eloci
tyof5ms-1.Ifthe
two
bodiesst i
ckt ogetheraf t
ercol l
isi
on, calcul
atet heircommonv elocity
.
-1
(d)Abulletofmass10gi sf i
redf rom agunatav elocityof400ms .I fthe
gunhas
amassof5kg, fi
ndther ecoi lvel
ocit
yoft hegun.
(e)Agirlofmass60kgst andsonawei ghingscal einal if
t.Whati
st he
readi
ngin
newtonswhent helif
tmov es
(i
) upwar dswi t
hanaccel eratonof2ms-2.
i
(i
i) downwar dswi thanaccel erat
ionof2ms-2
(i
ii
) downwar dswi thaconst antvelocityof3ms-1
(i
v) f all
sf r
eelywhent hecabl ebreaks.

7.(a)Def inet heterm momentofaf or

ce.
(b)St atethepr incipleofmoments.
(c)Descr i
bebr i
eflyhowt hemassofamet rer
ulecanbedet ermined.
(d)Amet reruleofmass100ghadal oadofmass200gsuspendf r
om it
s
oneend.
I
ft hemet rerulebalanceshori
zontall
yonaknifeedge,deter
mi nethe
position
oft hekni f
eedge.
(e)(i
)Def i
net het erm centr
eofgravi
ty.
(i
i)Howwoul dy oudet er
mine,
byex peri
ment,
thecentreofgrav i
tyofan
i
rregularlami na?
(
iii
)Expl ainwhati smeantbystabl
e, unst
abl
eandneut r
alequil
ibri
um.
Giveone
exampl eofeach.

3
8.(
a)Whatar ecat hoder ays?
(
b)Howcancat hoder aysbeproduced?
(
c)Statef ourproper ti
esofcathoder ays.
(
e)(i
)Whati smeantbyt hetermr adioact
ivi
ty?
(i
i
)Thehal f
-l
ifeofar adi
oacti
veel ementXi s24days,cal
cul
atet
hemass
remai ni
ngunchangedof0. 64gofXaf t
er120days.
(
f)Statetheef fectofmagnet i
cfieldon
(i
)gammar ay s
(i
i
)bet apar t
icl es
(i
i
i)alphapar ticles

9.(a)(i
)Def inethet erm electromot i
v ef
or ceandi nternalr
esist
anceofacell.
(i
i)Acel li
sj oinedi nserieswi thar esistanceof2Ωandacur r
entof
0.25A
fl
owst hroughi t.Whenasecondr esistanceof2Ωi sconnect edin
parall
el
wi ththefirstthecur r
entt hrought hecel l
increasesto0.3A.Whati st
he
e.m.fandi nternalresistanceoft hecel l
?
(b)Descr i
behowagol dleafel ectroscopecanbechar gedposit
ivelyby
i
nduct ion.
(c)Expl ai
nthewor kingofal i
ght ningconduct or.
(d)(i
)Whati smeantbyel ectri
cf ield?
(i
i)Def i
neneut r
alpointasappl i
edtoel ectrostati
cs.
(
ii
i)Drawel ectri
cf i
eldpat ternbet weenanegat i
velychargedpointanda
neutral
metalplate.

10.
(a)Def i
net hetermsbelowasappl i
edt owaves
(i) ampl i
tude
(ii
) f requency
(ii
i) wav el
ength
(iv) wav efront
(b)Descr ibebriefl
yhowt heveloci
tyofsoundinaircanbedet
ermined.
(c)Ast udentst andingbetweentwov ert
ical
cli
ff
sand480m fr
om the
near estcliff
,
shouted.Shehear dthefir
stechoaf t
er3secondsandthesecondecho
after2
secondsl ater
.Usethisinf
ormationtocalcul
ate
4
 (i
) t hev elocit
yofsoundi nair
(i
i) t hedi stancebetweenthecliff
s.
(d)(i)Disti
nguishbet weenrefracti
onanddiff
racti
onofwav es.
(
ii)Drawadi agram toshowhowpl anewavesaredi
ffractedthrougha
narrow
gap/ sli
t.
(
iii
)Witht heaidofadi agram showhowci r
cularwavesarer ef
lectedbya
str
aightbar ri
er.

11.
(a)Whati smeantbyt het erm magnet isat
ion?
(b)Statethetypesofmagnet isati
on.
(c)Howcanamagnetl oseit
smagnet ism?
(d)(i
)Whati smeantbymagnet i
cfiel
dandaneut r
alpointasappli
edto
magneti
sm?
(
ii
)Drawmagnet i
cfieldsduet oabarmagnetpl acedwithit
snorthpole
faci
ng
thegeographicsout hoft heearth.
(e)Stateanyimpor t
antdi f
ferencesbet weensofti
ronandsteeland
indi
catewhich
youwoul dselectforuseas
(i
)amagnet i
ckeeper
(i
i)thecoreofanel ectromagnet .

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