skema jawapan modul tembak 32

8/9/2019 Skema Jawapan Modul Tembak 32

1/11

SKEMA JAWAPAN MODUL TEMBAK 32

Skema Bahagian B

SET 1

Number Answer Mark

9 (a) Pressureis defined as normal force perunit area//p=F/A, where p=pressure, F =

force and A=area

(b)!"epth of sinkin# in "ia#ram 9$ is deeper than in "ia#ram 9$% l

!&he wei#ht of the man in "ia#ram 9$% and "ia#ram 9$ is e'ual //

!Area of contact with the sand in "ia#ram 9$% is lar#er than "ia#ram 9$

! the hi#her the dept of sinkin#, the hi#her the pressure

!th hi#her the area contact, the lower the pressure

(c)(i)

(ii)

the fan blow air out of the ent

produce a partial acuum area in the acuum cleaner

difference in pressure occurs/atmospheric pressure is hi#her than the

pressure inside the acuum cleander

forced is eerted in/pushed in the dirt

(d) aspect ep!anati"n

*se oil +ncompressible/no air buble

i#h boilin# point/low

densit-

"oes not eaporate easil-/li#hter

.mall Master piston &o produce hi#h pressure

i# slae piston &o produce a bi# force on the disc

Aluminium/steel for

tansmision pipe

.tron#/does not rust easil-

%

%

%

%

%

&otal %0

SET 2

0 (a) (i) 1lectroma#net is a deice in which ma#netism is produced b- an electric

current // temporar- ma#net made b- windin# a coil round a soft iron core

and ma#netic field produce when current flow$

(ii) 2urrent flow in dia#ram 0$% is more than 0$ // ice ersa$

&he amount of iron filin# attracted b- iron core in "ia#ram 0$% is

more than 0$ // ice ersa$

&he ma#netic stren#th in dia#ram 0$% is more than 0$ // ice ersa$

Amount of iron filin# attracted increase when current increase &he ma#netic field stren#th increase when current increase

(b) 3hen too hi#h current flow, ma#netic field stren#th become er-

stron# / wire epand

electroma#net pull the soft iron armature / pulled to the ri#ht b-

sprin# P$

release the catch, contact separate and current does not flow

3hen reset button is pressed, sprin# 4 pulls the soft iron armature back

to its ori#inal position

(c) (i) 3hen the coil rotates the coil cut across the ma#netic field lines

+nduced current flow in the coil$

&he current maimum when the coil cut the ma#netic field at ri#ht an#le

// current decreased (become 5ero) when the coil moe in parallel with

ma#netic field lines

&he direction of current flow determine b- usin# Flemin#6s ri#ht hand

(Ma 7


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rule

After 90o the direction of current in the eternal circuit reersed/

8)

(ii) M"#i$icati"n Ep!anati"n

2han#e slip rin#s with

commutator

&o reerse contact with brushes so that the

current flow in same direction in eternal

circuit

*se stron#er ma#net &o increase the ma#netic field stren#th*se more number of turn

for the coil/ +ncrease the

speed of rotation

+ncrease the rate of chan#e of ma#netic

field/increase the induced current

%

%

%

T"ta! 2%

SET 3

9 (a) A phenomenon when li#ht trael in different medium with different densities

chan#e in speed and direction // the bendin# of li#ht when traellin#

throu#h different medium

(b) &he refractie inde of A : the refractie inde of

&he refracted an#le of medium A ; refracted an#le of medium

&he densit- of medium A : densit- of medium

&he #reater the refractie inde the smaller the an#le of refraction

&he #reater the refractie inde the #reater the ratio of sin i to sin r

(c)


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%

%

T"ta!2%

SKEMA BA&A'(AN )

SET 1

(a) Archimedes Principle

(b) $ &otal densit- of ship *densit- of water

%$ uo-ant Force +&otal wei#ht of ship

(c) (i) &o ensure the ship will not be oerload // ensure the safet- of ship (ii) &o enable the ship to trael safel- in different densities of sea water

(d)

0

(e) (i) ?olume of water displaced = ?olume of wooden block

= m

@

= A00

B

= B$CD 0!BmB

(ii) 3ei#ht of load E 3ei#ht of wooden block = wei#ht of water displaced

3ei#ht of load E 3ei#ht of wooden block = @ ? #

3ei#ht of load E (B 0) = 000 B$CD 0!B 0

3ei#ht of load E (B 0) = BC$D

3ei#ht of load = BC$D B0

= C$D N

Mass of load = 0$CD k#

T"ta! 2%

SET 2

$ (a) (i) &hermal e'uilibrium states that the net rate of heat flow from one medium to

3

)ha,acte,istics -eas"n

.treamlined shape &o reduce water resistance

i#h stren#th of metal &o withstand hi#h water pressure

3ide base cross section area .o that ship can float//preent from

oerturn // ship more stable // ship notsink deeper

i#h olume of air space in

the ship

Produce air buo-ant force// ship can

float

.tructure P .treamlined shape, i#h stren#th of

metal, 3ide base cross section area,

i#h olume of air space in the ship


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another medium and ice ersa is 5ero// temperature for both medium is the same$

(ii) ! Place the thermometer under the ton#ue

! eat transfer from the bod- to the mercur-

! &he temperature rises // len#th of mercur- increases

! 3hen the e'uilibrium state is achiees take the readin# of thermometer$

(b) (i) 00 2

(ii) eat supplied b- metal block = heat #ained b- the water //

m cG = m % c%G %

0$%D 900 (00 G) = 0$D 8%00 (G !%9)

G = %C$C8 2

(iii) No heat loss to the surroundin#

(c) Aspect 1planation

>ar#e numbers of fin blade ! +ncrease surface area // release heat 'uickl- //

en#ine cools 'uickl-

i# si5e of fan 2an suck more air // more air can be blow to

the en#ine

i#h boilin# point Not easil- to apori5e // the olume of li'uid

reduce slowl- // takes a lon#er time to boil

i#h specific heat capacit- &akes a lon#er time to become hot // the rise

in temperature is slow

. is chosen >ar#e numbers of fin blade,bi# si5e of fan,

hi#h boilin# point, hi#h specific heat capacit-

0

SET 3 T"ta! 2%

%$ (a) "epth // densit- //#

(b) !Pressure increased with hei#ht

!Pressure in +? bottle is #reater than the patient6s ein!Medicine flowin# from +? bottle because hei#ht produced difference in pressure//

Medicine flow from hi#her pressure to lower pressure

! #raitational pull // wei#ht of li'uid

(c) 2hoices 1planation

Made of concrete .tron#er / Not eas- to break

// metal can rust easil-

low densit- li#hter / the structure that hold the tank

able to withstand the wei#ht of tank

thicker wall at the bottom //

"ia#ram

able to withstand the hi#her pressure at

the bottom

hei#ht from #round is hi#h to produce a #reater difference in

pressure

< is chosen Made of concrete, low densit-,

thicker wall at the bottom, hei#ht from

#round is hi#h0

(d) (i) !Atmospheric pressure at both side is e'ual

!Pressure does not depends on si5e of arm

(ii) Patm E h- # = P atm E h%#

( 0 0 !%) ( %00 ) ( 0 ) = ( H 0 !%) ( ) ( 0 )

= CD0 k#m!B

T"ta! 2%

4


5/11

KE-TAS 3

Question 1 Marks Answer

(a)(i) 1 Stating the correct manipulated variable.Length of wire// l

(ii) 1 Stating the correct responding variable.Potential difference// Voltage// V

(iii) 1 Stating a correct fixed variable.Thickness of wire// resistivity of wire// type of wire

Tabulating results of the experiment ( marks!1. Labels l and V are shown". Correct unit for l and V#. ll readings of l are correct to one decimal place$. !ini"u" # correct readings for V to 1 or $ deci"al place

. ll readings of V are correct to 1 deci"al place

l % cm V/V

$%&% %&' or %&'%

'%&% %& or %&%

%&% 1&$ or 1&$%

*%&% 1& or 1&%

1%%&% 1& or 1&%

&lotting the l against V graph ( marks!

1 & V on the y+a,is and l on the ,+a,is&$ -& .nits stated for both l and V correctly# C& The scales on both a,es are regular and not an odd scale&' & 0 points plotted correctly from table(reading is wrong plotting fro" table correct "ark canbe given)0 2& # points plotted correctly from table& 3& Line of best fit&4 5& 5raph si6e a "in7"u" of 08' (0 bo,es on y+a,is ' bo,es on ,+a,is)&

(d) 1 Stating the correct relationshipV is directly proportional to l // V 9 l

(e)(i)(ii)

11

Volt"eter reading decrease:esistance decrease

5


6/11

Question " Marks Answer

(a)(i) 1 h is directly proportional to t$ // h 9 t$

(ii) 11

1

1& ;how on graph with appropriate vertical and/or hori6ontal linecorresponding to '' c"

$& t

$

< %&%**#& t < (%&$ +%%) s

(b) # 1& rawing the gradient triangle Triangle si6e a "ini"u" of *ver , * horof c"$& ;ubstitution (values fro" student=s triangle)#& nswer with correct unit '' cms"

(c) (i) (ii) 1#

u < % "s +11& ;how that h < " t$$& ;ubstitution of the gradient > g < 0%%#& nswer with correct unit& 1''' cms" or 1' ms"

(c) 1 ?hen "easuring the values of h "ake sure the eyes are perpendicularto the scale on the "etre rule to avoid paralla, error&

)*M+A, 1"

Contoh ;et 1Marking Scheme Paper 3 Physics Mid Year SBP 2007

Question

Marks

Marking Scheme

1 a (i)

1 State the manipulated variable correctly;The distance object

(ii) 1 State the responding variable correctly;The image distance(iii) 1 State one !ed variable"

The focal length

6


7/11

b1

1

1

1

1

1

#abulate $u$ v$u

and

v

correctly in the table%

& Shows a table which have u, v,u

and

v

B State the correct nit of /cm, v/cm,u

/cm-1 and

v

!cm"1

' #ll vales of v are correct

( $ales ofu

are correct

) $ales ofv

are correct

* #ll vales of are consistent

(c)(ra+ the graph o, W against h.# " %abel &"a'is and '"a'is correctl& " States the nit at the a'is correctl& " oth a'es with the even and niform scale*+ " 5 ,oints correctl& ,lotted*- " a smooth best straight line

. " minimm si/e of the gra,h is 5 ' 4S0ares of 2 ' 2 cm*

d 1 State the correct relationship based on the

candidate-s graph . negative gradient striaght line

graph/v

decrease linearl& to

u

e 1 State 1) correct precaution so as to produce anaccurate result o, the e!perimentThe ,osition of the e&e ,er,endiclar when taes thereading to avoid errors de to ,aralla'!s&stematic error

#otal Marks

Question

Marks Marking scheme 1ote

bjectdistance (cm)

mage distancev (cm)

u

(cm"1)v

(cm"

1)4 2472 725 74235 2673 728 7393 37 733 73325 375 74 72

2 67 75 71

1umber o, 4 Score6 55 4

3"4 32 2

1 1


8/11

2 a (i) 1 State the relationship bet+een ! and

a

correctly

!is directl& ,ro,ortional toa

(ii) 1

1 1

a

: 725

Sho+ hori5ontal line parallel to the a!is +ith the

a

a!is

' : 7425 m

(iii) 1 a : 2722 m

b (i)

1

1

1

'alculate the gradient o, the graph and state thevalue

+ithin the acceptable range

Show the triangle with an acce,table si/e ( 4 ' 4 s0aresof 2 cm)Substitute correctly . according to the candidate-s

graph/

m :9$0

%D$%

State the correct value o, the gradient +ith unit : 275 m2

b (ii) 1

1

1

State :D

Gradient

Substitute the gradient ,rom b .i/ correctly

:D

D$%

State the correct ans+er +ith unit

: 75 m

c

1

State 1) correct precaution so as to produce anaccurate result o, the e!periment

The e',eriment mst be held on the


9/11

&rocedure/1& The apparatus is set up as shown in the diagra" above&$& The piston of the syringe is adAusted until the volu"e of air in the syringe is 1%% c" #at at"osphericpressure& The syringe is connected to a -ourdon gauge and the pressure of the air in the syringe is observed andrecorded&'& The piston is then pushed in so that the volu"e of air trapped is % c"#& The pressure is again recordedthis procedure is repeated for enclosed volu"es of *%c"# 4% c"#and % c"#&

Tabulating data

Volu"e V/c"# Pressure P/Pa

1%%%

*%

4%

%

Anal0sing data

Soalan "%2

nference/the strength of electro"agnetis" depends on the current in the coil&

,0pothesis/The larger the current in the coil the stronger the strength of electro"agnetis"

Aim/To study the relationship between the si6e of current carried by the coil and the strength ofelectro"agnetis"&

ariable/!anipulated variable@ current 7:esponding variable@ strength of electro"agnetis" (nu"ber of pins collected)3i,ed variable@ no of turns

Apparatus /pins soft iron rod insulated copper wire connecting wires& Power supply a""eter rheostat switch retort stand with cla"p&

Arrangment of Apparatus

8

>!>a

$!cm

3


10/11

&rocedure/1&The switch is closed and the power supply is switched on & The rheostat is adAusted to obtain the current 7< %&0 &$& The no of pins attracted to soft iron rod is counted& The values of current 7 is repeated with 7 < 1&%1&0 $&% and $&0

Tabulating data

Current7/ Bo pin attractB%&0

1&%

1&0

$&%

$&0

Anal0sing data

Soalan #%3

nference/The buoyont force depent on the volu"e of an obAect

,0pothesis/The higher the volu"e(or depth of iron bar/surface area) the higher thebuoyant force

Aim of experiment@ To investigate the relationship between volu"e and buoyant force

ariables in the experiment/!anipulated variable@Volu"e:esponding variable@:eading of the spring balance(-3)3i,ed/ constant variables@Volu"e of the water

+ist of apparatus and materials* ?easring c&linder a metal rod s,ring

balance and metre rle beaer water retord stand

Arrangement of apparatus

&rocedure1& The "eter rule was clipped to the retort stand beside of the iron bar&$& The volu"e of the iron bar is set at h < $%&% c" ##& The reading of the spring balance is recorded&'& ;tep $ and # is repeated for the height h< $0&% c" #%&% c" #0&% c" and '%&% c"&Tabulation of data

Tabulating data Anal0sing data

Volu"eV/c"# ?eight ?/B

%&0

1&%1&0

$&%

$&0

1

@

!#

V/c"#

?/B


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skema jawapan modul tembak 32

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