Answering Technique Physics Paper-3

8/11/2019 Answering Technique Physics Paper-3

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Answering Question Technique

Physics SPM (4531/3)

Paper 3 (40 ar!s) Tie" 1 1/# hours

Section A [#$ ar!s%

(# questions& Answer a'' Questions ro this section& Tie suggeste or section A is *0 inutes)

Section A +Question 1 (1* ar!s)

a). Identify / State variables (3 marks)

b). Data tabulation (7 marks)

c). Drawing gra! (" #arks)

d). State relations!i between resonding variable and maniulative variable based on gra! ($ marks)

a)& ,entiy / State -aria.'es

#aniulative %ariable& '!ysical uantity w!ic! its value can be fied by t!e eerimenter beforecarry out eeriment*esonding %ariable& '!ysical uantity t!at c!ange its value in resond to t!e c!anges+ied %ariable& '!ysical uantity t!at is set to remain constant t!roug! out t!e eeriment.e.g.

.) Ta.u'ation o ata in a ta.'e (Section A Question1 )

Ta.u'ate resu'ts or a'' -a'ues o l T an T#

in the space pro-ie

n the graph paper pro-ie p'ot a graph o T# against l

$

#aniulative variable& ,engt!- l of t!e endulum

*esonding variable& 'eriod of oscillation- T

onstant %ariable& #ass of t!e bob/umber ofoscillation

iagra 1&1

l 2 30&0 c t 2 s

T2 s T# 2s#

iagra 1&#

l 2 40&0 c t 2 s

T2 s T# 2s#



Mar!ing riteria or Ta.'e

$. S!ows a table (e.g. w!ic! !ave l - 0 and 01 correctly in t!e table)1. State t!e correct unit of l /cm- 0/s and 0 1/s1 3. 2ll values of maniulative variable- l are correct. 2ll values of resonding variable- 0 are correct". 2ll values of derived variables- 01 are correct4. 2ll values of resonding variable 0 are consistent in decimal laces7. 2ll values of derived variables- 01 are consistent in decimal laces

( 7 5 6 7 marks )

c) rawing o 6raph ro ata in ta.'e (Section A +Question 1)+ 5 ar!s

Mar!ing riteria or 6raph

$. ,abel 8ais and 98 ais correctly1. States t!e unit at t!e aes correctly3. :ot! aes wit! t!e even and uniform scale. " oints correctly lotted

". 2 smoot! best straig!t line4. #inimum si;e of t!e gra! is (base) " (!eig!t) suares of 1 1 cm ($/1 t!e si;e of gra!

aer)

umber of 5 Score4 ""

38 31 1

1



$ $Tips or P'otting A 6oo 6raph

• If t!e gra! lotted aear an abnormal oint- lease c!eck • +ollow instruction for lotting gra!- if 01 against l -01 must be in t!e ais (If ot!erwise marks

for labeling will be deducted)• 2s far as ossible start your gra! from t!e <rigin- if not will !ave roblem in answering in t!e

following section• +or finding t!e gradient draw a triangle as big as ossible- i.e. using t!e w!ole gra! and label t!e

base and !eig!t• 7oth aes must be label wit! symbol of uantity and unit

) State re'ationship .etween anipu'ati-e -aria.'e an responing -aria.'e(Section A Question 1 )

$. ===. is directly roortional to====( 2 straig!t line gra! asses t!roug! t!e origin)

1. ===.. is linearly roortional to ===..

[ straig!t line intercet at ais (ositive gradient)>

3. ===.. is decreasing linearly wit! ===== [ 2 straig!t line intercet at ais (negative gradient)>

. ===== is inversely roortional to ==== [ 2 curved gra! wit! negative gradient >

". ?!en ===.. increases- ===. increases [ 2 curved gra! wit! ositive gradient>

(2void using 01 increases l increases instead use T# 'inear'y proportiona' to l or increases linearly (leastadvisible) . <t!er eamle e8ponentia' proportiona'- in-erse'y proportiona'- irect'y proportiona'.)

Section A+Q #+ Questions n 6raph ( 1# ar!s )&

Ana'ysis o graph gi-en ( 10 or 11 ar!s)

3



(a)& in the 'ength su.erge when container is epty

Answer" 5 c

(.)&, l is 19&#5 c what is the weight o 'ea shots

Answer" 0&#5 :

(c)& The re'ationship .etween l ; w is gi-en .y the equation&

<2=>/1000%l +0&1 in > o 'iqui (g 2 10 +#)

Answer&2 =(0&4+0&1):%/=(?0&#5+0&10)%2# :+1 (? on-ert unit to .ecause g gi-en is in s+#)

equate 2# with >g/1000 ro the equation

thereore # 2 >g/1000

>2 # 8 1000 / 10



>2 #00 !g / 3

2llocation of marksa) State relations!i of variables ($ mark)State relations!i of variables. e.g.& ?!at !aens to l as < increases @ b). alculation of gradient- values (by etraolation or interolation)- derived values- determine values based on t!e gra! given ($A marks) (S!ow on t!e gra! !ow you obtain t!e gradient. Substitute t!e gradient into t!e euation to get B)

[Cradient&8 0riangle almost $/1 t!e si;e of t!e gra!>traolation8values etend off8side t!e range.Interolation8 value determine on t!e gra! (one uantity corresond to anot!er)S!ow on t!e gra!- !ow to determine t!e value of < if value of l is $7.1" cm.(Interolation)?!at is t!e lengt! submerged w!en container is emty (traolation)

c). 'recautions ($ mark) e.g. State one recaution t!at can be taken to imrove t!e accuracy of t!e readings in t!is eeriment.

Precautionary Steps or ,n-estigation @8perient

o. 0ye ofeerimentinvolving

'recaution t!at can be taken

$ ,ig!t a. eeriment must be carried out in a darkened room b. lens- obEect and screen must be in linec. make sure t!at t!e line of vision is erendicular wit! t!e scale of metrerule w!ile reading t!e scale to avoid aralla error

1. Sring a. make sure t!e sring is not loaded beyond t!e elastic limit (t!at is t!esring returned to its original lengt! w!en t!e load is taken off) b. make sure t!at t!e line of vision is erendicular wit! t!e scale of metre

rule w!ile reading t!e scale to avoid aralla error 3. lectric a. make sure t!at all connections are secure/ tig!t to avoid current leakage b. 0!e switc! s!ould be off after t!e readings are taken to revent wiresfrom !eating u/ resistance increasesc. make sure t!at t!e line of vision is erendicular wit! t!e scale of metrerule w!ile reading t!e scale to avoid aralla error

. Feat a. liuid is stirred constantly so t!at temerature rises evenly b. 2luminium block is wraed wit! insulating material to avoid !eat lossc. t!ermometer bulb must be smeared wit! oil to give better t!ermalcontact wit! t!e block d. make sure t!at t!e line of vision is erendicular wit! t!e scale of metre

rule w!ile reading t!e scale to avoid aralla error " #easuringinstrumentinvolvingammeter-voltmeter-metre rule==

a. make sure t!at t!e line of vision is erendicular wit! t!e scale of metrerule w!ile reading t!e scale to avoid aralla error b. 0ake into account ;ero error of t!e instrument

GHnaccetable answer& 2void aralla error (wit!out elanation)

"



@8ap'e" Question # n Section A

( Question # +Sectioon A ear #00$)

(a) (i) State re'ationship .etween a an h

Answer " a is irect'y proportiona' to h

(ii) eterine -a'ue o a when h2 0&30

Answer" a2 1&5 s+#

(.) a'cu'ate the graient o the graph Show on the graph how you eterine

Answer" 2 (1&0+0&5)/(0&#0+1&10)

2 5&0 s+#

(c) is gi-en .y the oru'a 2 g / l where g is the gra-itationa' acce'eration an l is the 'ength othe inc'ine p'ane& ,n the e8perient l 2 #&0 & a'cu'ate the -a'ue o g

Answer" 2 g/l 5 2 g/# thereore g 2 5 8 # 2 10 s+#

() Stuent repeats e8perient& Bsing inc'ine p'ane o l 2 1&5 an raise en to height h 2 0&10

Bsing the oru'a a 2 (g/l )8 h an the -a'ue o g in (.) ca'cu'ate a

Answer" a2 (g/l ) 8 h

2(10/1&5 )8 0&10 2 0&*9 s+#

4



Section B =1# ar!s%

(Answer any one question ro this section& Tie suggeste or section 7 is 30 inutes)

Question on @8perient raewor!

a). Identify variable & Fig!lig!t and relate t!e !ysical uantities to t!e closest terms. 'ay secial attention

to uantities w!ic! varye.g. 3 Section : '3 S'# 1AAJDiagram 3.$ and 3.1 s!ow a worker us!ing a w!eelbarrow on a soft ground. Fe notice t!at t!e tyre sinksdeeer into t!e ground w!en t!e w!eelbarrow is loaded

uantities w!ic! are varied & ?eig!t on w!eelbarrow (*elated variable 6 +orce)-0yre sinks deeer (*elated variable 6 'ressure)

b). ?riting 0ec!niue & i) Inference ($ mark) :ased on observation82n initial interretation or elanation concerning t!e observation. It can be true or false. ormally use terms like deends on- influenced by affected by

(<bservation8 2ction involve senses in gat!ering information about an obEect or event) #aniulative variable affects t!e resonding variable *esonding variable is deends on t!e maniulative variable *esonding variable is influenced by t!e maniulative variable

e.g& :igger force causes t!e tyre sink deeer :igger ressure causes t!e tyre to sink deeer 'ressure eerted on t!e ground by t!e tyre is deendent on t!e force acted on t!e tyre

(not encourage to write inference same as !yot!esis)

ii) Fyot!esis ($ mark)

Fyot!esis& 2 statement of an eected outcome t!at usually states t!e relations!i between twovariables w!ic! will undergo a direct eeriment test?!en t!e maniulative variable increases/decreases t!e resonding variable increases/ decreases

e.g & 0!e greater t!e force- t!e greater t!e ressure

• Fyot!esis only refer to t!e eerimental frame work not t!e diagram given(ot encourage writing !yot!esis base on diagram)

7



iii) 2im ($ mark) 0o study/investigate t!e relations!i between maniulative variable and t!e resonding variablee.g. 0o investigate t!e relations!i between force and ressure

iv) 0yes of variables& #aniulative- *esonding- +ied (<nly one fied variable needed) (1 marks) %ariable& '!ysical uantity t!at can be varied in an eeriment

( State the -aria.'es that can .e easure ) ncourage to write oerational definition for variables.e.g. Pressure is t!e epression make on t!e lasticine by t!e mass. +orce is taken as t!

Mass dro from t!e !eig!t of "A cm)e.g.&#aniulated variable& #ass of obEect*esonding variable& Det! of deressiononstant variable & Feig!t of obEect dro(%ariable must be re'ate with the e8perient and t!e common one- e.g.&t!e Perio o osci''ation- notencourage to write tie or 10 osci''ations)

v) ,ist of aaratus and material. ($ mark) State all t!e imortant aaratus usede.g. 'lasticine- weig!t/obEect of "Ag- $AAg- $"Ag- 1AAg and 1"Ag and metre rule

o. '!ysical uantity #easuring 2aratus$ ,engt!/Distance/Det!/Feig!t/tension #eter rule1 #ass ,ever balance/0rile beam balance3 0ime of oscillations/'eriod Stowatc! 0em erature 0!ermometer

" urrent 2mmeter/Calvanometer 4 +orce Sring balance7 Diameter of wire #icrometer screw gaugeJ %elocity/2cceleration 0icker timer and ticker taeK Cas %olume Syringe$A Cas 'ressure :ourdon gauge$$ 'otential difference %oltmeter $1 #agnetic field strengt! umber of nails attracted$3 ?avelengt! #eter rule$ ontrol current *!eostat$" ?ater volume #easuring cylinder/:eaker

$4 *esistant of wire 2mmeter and %oltmeter ( * 6 %/I )

vi). 2rrangement of aaratus& ($ mark)

Draw a fully labeled diagram

J

($ mark)



c). #et!od/'rocedure& (0!ree imortant statements) (3 marks) i). Start t!e eeriment wit! maniulative variable& ===.. (a ractical value) ii). *esonding variable is measured and recorded (ways and !ow@) iii). *eeat t!e eeriment times wit! different values of maniulated variable 1A- 3A- A- A g (mention all t!e remaining)e.g.$. 'lasticine wit! uniform t!ickness is laced on t!e table1. Dro "A g obEect on t!e from a fied !eig!t ! (obEect must be uniform si;e like suare s!ae not round)

3. *emove t!e weig!t and measure t!e det!- d of t!e deression on t!e lasticine using metre rule. *eeat t!e stes by using weig!ts of $AA g- $"A g- 1AA g- and 1"A g

d). 0abulation of data ($ mark)

e). 2nalysis of data& (State and sketc! a gra!) ($ mark)State & 2 gra! of resonding variable against maniulated variable is lotted or s!ow t!e sketc! wit! aes labeled ( can wit!out t!e real s!ae of t!e gra!)

#aniulated%ariable / unit

*esonding%ariable/ unit

88State

2ll t!e 888blank888 %alues888

Mass / g epth / c

"A$AA$"A

1AA1"A

K

*es. %ar /unit

#ani. %ar/ unit



G Do not describe irrelevant eeriment. #aimum mark for irrelevant eeriment is only 4 will lose Jmarks (asects may be awarded marks are & inference- !yot!esis or aim- tabulation of data and analysis ofdata )

amle&

:T escri.e e8perient on ass an perio o osci''ation

$A

ierent ass

ierent ina' 'ength

o spring

Answering Technique Physics Paper-3

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