Paper 2 Nov1999 Physics

Answer guide for O Level Physics (5054/2) – Paper 2 Theory November 1999

1(a)

arro rrow la labelled led gr gravity/ ty/weigh ight/g/ do downwards on on ca car an and ar arrow labelled friction / F / up along ramp

1

(b)(i)

slows down or reduces speed or stops moving

1

(ii) ii)

decreases ac accelerat ration or or re reduces th the to top sp speed (n (not sl slows do down) or or reaches a constant or terminal velocity 1

(c)(i)

work = force x distance

1

0.099 J or Nm

1

(ii)

0.8 – 0.099 = 0.701 J

2

2(a)

CAB

1

(b)

distance between molecules in gas larger or solid smaller

1

or more space between molecules or fewer molecules in a given volume

1

(c)(i)

molecules in fixed position molecules vibrate

(ii)o (ii)or( r(iii iii))

mole molecu cule less move move thro throug ugho hout ut liq liqui uid d or con conta tain iner er (not (not vibrate)

(ii) (ii)or or(i (iii ii))

mole moleccule ules mov move rand random omly ly

(ii)

molecules ex exchange pa partners / hit or or sl slide pa past ea each ot other

(iii iii)

stra traigh ight li line mo movement or or mo move fr freely or or no no mo molecular fo forces or or move faster /more K.E. accept particles, atoms etc for molecules

4

3(a)

left to right in rod

1

(b)

inwards or towards the magnet (not backward or forward alone)

1

Fleming‘s or left-hand rule or catapult effect mentioned

1

or fields of magnet and current interact directions of field, current and force related to fingers or Fig 3.1 or catapult field sketched or described

1

(c)(i)

moves, rolls etc faster) or moves further

1

(ii)

direction reversed or opposite to (b) or returns to initial position

1

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EITHER

(a)( (a)(i) i)

Corr Correc ectt circ circui uitt e.g. e.g. top top buzze uzzerr conn connec ecti tion on to +ve +ve rail rail from from powe power r supply and bottom buzzer connection to top of switch and bottom of switch to –ve rail 2

(ii)

First column correct LOW HIGH

1

Second column reverse of first column (alternatives for HIGH and LOW are acceptable eg 1/0)

1

OR (b)(i)

A AND (gate) B NAND (gate)

2

Inputs 1 and 0 give output 0 for A and 1 for B A and B outputs are always the opposite of one another or full truth table given or outputs correctly described for all input combinations

2

charge or electrons moves on or off cloth

1

electrons placed on leg or component

1

positive charge on top of or within the aluminium foil

1

negativ tive char harge on the the botto ottom m or extre treme sides ides of th the foil foil and neg

1

the positiv tive (on foil) and negativ tive charge (on (on leg legs) cancel or neutralise each other; the foil (and legs) are only left with negative charge

1

prote roteccts from from a hig high h cur curre ren nt (no (nott a surge and not to cont contro roll cu curre rrent) nt)

1

breaks the circuit or the fuse blows or melts

1

with fuse blown the lamps or circuit are no longer live l ive or cannot cause a shock or if fuse is in neutral wire when fuse blows lamps still live or can cause a shock

1

(b)

P =VI = 60/230 = 0.26A

2

(c )

5/0.26 = 19

2

7(a)

G.M./Geiger (Muller) tube or counter ionisation chamber etc

1

(b)

(fast moving) electron or 0-1e

1

(c)

β-particles are stopped or absorbed

1

(d)(i)

α-particles are stopped by the empty carton or the

1

(ii)

-particles pass through the full carton or there is little or no change γ -particles

5(a) (b)(i) (ii) ii)

6(a 6(a)(i) )(i) (ii)

in reading when a carton passes or s or strong shielding needed

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1


8(a)(i )(i)

the temperature when wax or so solid lid changes to liq liquid or or vi vice versa

2

(ii)

59 0C

1

(b)

5.4 to 6.0 minutes to reach 59 oC from 30 oC at t=0 constant temperature at 59 oC for for at at least least 7 minu minutes tes then then turn turning ing up 2

9(a)

Place two pins in line for incident ray Place two more pins to line up with first pins as viewed through block Join pins on both sides up to block or use ray box Trace incident ray Trace emergent ray using dots or middle of beam

(b)

3

correct angles measured 34-36˚ and 22-24˚ sin i/sin r refrac refracti tive ve index index value value correc correctt 1.4 1.4 - 1.5 1.5 to to 2 or 3 signifi significan cantt figure figuress

(c )

3

Axes lab labelled and correc rect way round using ing at least half gr graph paper for points Points plotted correctly Sensible smooth curve drawn 0 to 80˚ Fine line and fine circled dots or crosses

(d)(i)

4

value obtained when x = 90 o shown on graph or explained or calculation using values from graph i.e. sin -1 (1/n) critical angle 42.5-44 o

2

(ii)

x cannot exceed 90 o or 50 o is greater than critical angle

1

(e)

Difference smaller values of y or lower graph or lower value of C or slope Similarity both go through the origin /or have the same shaped or i >r

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10(a 10(a))

mole moleccule ules hit hit walls lls of of pip pipee; mor moree mo molec lecule ules hit hit walls lls /se /secc or or molecules hit walls more frequently; more molecules inside pipe or molecules more compact 3

(b)(i)

pV = constant = 5060 x 1.000 x 10 5 = 5000 1.012 or 1.01 x 10 5 Pa

3

(ii)

1.2 x103 Pa

1

(iii)

P=dgh h = 1.2 x10/13000 x 10 = 0.12m

3

(c)(i)

down initially on left side and up on right left goes up (or right goes down) after initial change or as it leaks to be the same on both sides 4 or levels slowly move diagram down on left and up on right

(ii)

use a liquid with lower density

1

11(a)(i)

radio (or tv or radar), microwave, IR, UV, gamma

3

(ii) ii)

correct or order fo for 3 regions an and al all th those qu quoted re relativ tive to to vi visibl ible and X-rays (γ either side of X)

(iii)

1

sensible statement e.g. radio- communication microwave-cooking, microwave-cooking, communication IR night or fog vision, remote controls, range finding, heating effect UV tanning, sterilisation, ionisation, fluorescence, vitamin production

(iv) (b)( (b)(i) i)

gamma ionises, causes or kills cancer, detects cracks

3

same sp speed / tr transverse / reflect / refra fract /t /trav ravel in in vacuum / oscilla oscillatio tions ns of electr electric ic and/or and/or magnet magnetic ic fields fields /no medium medium needed needed

1

vibr vibrat atio ions ns of sour source ce caus causee vibr vibrat atio ions ns in atom atoms/ s/mo mole lecu cule les/ s/ti tiss ssue ues/ s/ baby etc back and forth or longitudinal motion described or stated or compressions and rarefactions described reflection from part of the body

(ii)

3

any frequency between 1MHz and 10MHz v =f λ λ equation

λ = v/f =1500/chosen value of f with correct unit

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Paper 2 Nov1999 Physics

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