Paper 2 Jun 2001 Physics

Answer guide for O Level Physics (5054/2) – Paper 2 Theory June 2001

1(a) (b) (c)

2(a)

(b) (c)

3(a) (b)(i) (ii) (iii)

4(a)

(b)(i) (ii)

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Use of a fiducial mark or subtraction of length of spring from original length 0.6-0.67 (kg) 10 x mass (N) graph lower or smaller extensions (for the same mass) or more mass needed for the same extension weight or pull of gravity or the force on spring less for the same mass

slowing down / decelerating / braking / retarding comes to rest or reaches 0m/s or has uniform deceleration (not deceleration at constant speed ) AB and EF distance = speed x time or area under graph attempts such as 1/2 x 60 x7, 210, 190 x 7, 1330, 1/2 x (190+250) x 7 1540m

X down on top of drum and weight /W down along midline +2mm P = F/A 100000 x 0.3 or F = P.A 30000N 8000 or 10000x0.8 total pressure = 100000 + 8000 = 108000 Pa

temperature involving change of liquid to gas or vapour at constant temperature or when liquid boils / bubbles form (or temperature when s.v.p. =atmospheric pressure) 18/22 x 100 or proportionality shown 81.8 or 82 oC only rapid/ quick acting / remote sensing / wider range / higher temps / small size

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Answer guide for O Level Physics (5054/2) – Paper 2 Theory June 2001

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

6(a)

(b)(i) (ii) (iii)

7(a) (b) (c) (d)(i) (ii)

8(a) (b)(i)

(ii)

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good conductor of electricity or has low resistance easily or strongly magnetised /demagnetised or concentrates flux or becomes an electromagnet current in primary coil or from a.c. supply sine wave with same period ( +3mm at any point) and larger amplitude amplitude 6V (+ 2mm on grid, or calculation shown)

current alters (increases or decreases) current increases as resistance decreases or vice versa (or resistance inversely proportional to current) capacitor / capacitance capacitor or A is being charged or receiving energy capacitor or A is releasing charge or energy / discharging / there is a p.d. across C

(smoke) particles or their movements are small light reflects / scatters (off smoke particles) random direction shown on track with > 3 segments (not if all deviations at wall) smoke particles are hit by air molecules/particles there are many air molecules or air molecules move at random or at high speed

GM tube / GM counter/ (photographic) film/ ionisation chamber / cloud chamber /solid state detector / spark counter B either B halves in 1 hour or half life is 1 hour A and C have half lives of 2 and 3 hours or halve in more than 1 hour or in 1 hour less than halve or (in any time) B falls by greater ratio/factor ratio/factor compared numerically with A and C in same time A 20 B 25

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Answer guide for O Level Physics (5054/2) – Paper 2 Theory June 2001

9(a)(i)

(ii)

(iii) (b)(i)

(ii)

(iii)

10(a)

(b)(i)

(c)

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K.E. of wind/air input electrical energy is output or appears at end of correct chain (not electricity) 1 air/wind entering or blades have more kinetic energy (arriving/sec) 2 more energy collected or more air enters / passes through / hits blades 3 less energy is wasted or more useful energy produced or more energy passes to generator or less friction solar / hydroelectric / nuclear / geothermal / tidal etc. stated or described D = M/V 1.2 x 540000 648000kg K.E. = ∫ mv2 ∫ x648000x62 11664000 J P = E/t 11664000 /60 194400 W

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in parallel independent action or in series both on/off together explanation in terms of break of circuit or own switch in parallel in parallel brightness/voltage/current larger or correct or working values in parallel lamps have 12V or in series lamps have 6V or share voltage 4 or resistance in series higher 1 R =V/I 2.0 A used 6Ω 2 P =VI 24W Resistance varies or Voltage and current are not proportional Calculation to show this or graph not a straight line or temperature rises 4 conduction through material eg glass, wire, cap or from glass to air convection within gas inside bulb or in air outside bulb radiation by rays /waves /light /infra-red from any part any one detailed point about a mechanism, e.g. atoms pass on vibrations/ density changes in convection/ hot air rises 4 or convection currents form / electromagnetic waves emitted

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Answer guide for O Level Physics (5054/2) – Paper 2 Theory June 2001

11(a)(i)

(ii) (b)(i) (ii)

(iii) (iv)

molecules of air/jar vibrate or move backwards and forwards along line of motion / longitudinal motion / compressions & rarefactions sound decreases in loudness or cannot be heard sound needs a medium / sound does not travel in a vacuum sound travels faster in earth/solid/ground shortest distance d = speed x time 320 x 0.1 32 m 32 / 0.02 1600 m/s 1 all light or sound is reflected back into earth or slow medium no ray refracts or escapes i > critical angle and ray moves from more to less dense or slow to fast medium 2 ray 4 refracts /bends away from normal (proves sound faster) or ray 5 undergoes or all ray 5 is reflected total internal reflection occurs from slow to fast medium

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