IJC H1 PHY P2

© IJC 20 CANDI NAME CLASS PHYS Paper 2 Candida No Add READ T Write yo hand in Write in You ma working Do not fluid. For Se c Answer For Sec Answer At the togethe The num each qu 011 INN JC in p Hig IDATE S SICS 2 Structured ates answe ditional Mate THESE INS our name, . n dark blue o ay use a s o g. use staples ction A r all questio ction B r any two q end of the er. mber of ma uestion or p Innova Ju NOVA JU C 2 PREL preparation gher 1 d Questions er on the Qu erials are re STRUCTION class and i or black pe oft pencil f o s, paper clip ons. uestions. examinatio arks is given part question This d unior College 8 UNIOR C IMINARY for Genera s uestion Pap equired. NS FIRST ndex numb n on both s or any diag r ps, highlight on, fasten a n in the bra n. document c e 8866/Prelim2 OLLEGE Y EXAMIN l Certificate per ber on all t h ides of the rams, graph ters, glue o all your w o ackets [ ] a t consists of 1 2 E NATION e of Educatio INDEX NU he work yo u paper. hs or roug h r correction ork securel y t the end of 19 printed p 2 on Advance UMBER u h n y f pages. For Sectio 1 2 3 4 5 Sectio 6 7 8 Tot [T ed Level 88 15 Se Examiner’ on A 2 3 4 5 on B 6 7 8 tal [Tuurn over 66/02 ep 2011 2 hours s Use 8 9 8 6 9 20 20 20 80 urn over

2 © IJC 2011 8866/Prelim2 [Turn over For Examiner’s Use Data speed of light in free space, c = 3.00 x 108 m s-1 elementary charge, e = 1.60 x 10-19 C the Planck constant, h = 6.63 x 10-34 J s unified atomic mass constant, u = 1.66 x 10-27 kg rest mass of electron, me = 9.11 x 10-31 kg rest mass of proton, mp = 1.67 x 10-27 kg acceleration of free fall, g = 9.81 m s-2 Formulae uniformly accelerated motion, s= u t + ½ a t2 v2 = u2+ 2as work done on/by a gas, W = pV hydrostatic pressure, p = gh resistors in series, R= R 1 + R2 + … resistors in parallel, 1/R = 1/R 1 + 1/R2 + …

3 © IJC 2011 8866/Prelim2 [Turn over For Examiner’s Use Section A Answer all the questions in this section. 1 (a) Complete Fig. 1.1 to show each quantity and its base units. Quantity Base Unit speed m s -1 density kg m 2 s-3 voltage [3] Fig. 1.1 (b) Two parallel strings S 1 and S2 are attached to a disc of diameter 12 cm, as shown in Fig. 1.2. Fig. 1.2 The disc is free to rotate about an axis normal to its plane. The axis passes through the centre C of the disc. A lever of length 30 cm is attached to the disc. When a force F is applied at right angles to the lever at its end, equal forces are produced in S 1 and S 2. The disc remains in equilibrium. (i) On Fig. 1.2, show the direction of the force in each string that acts on the disc. [1] string S2 string S1 force F lever C 30 cm 12 cm disc

4 © IJC 2011 8866/Prelim2 [Turn over For Examiner’s Use (ii) For a force F of magnitude 150 N, determine 1. the moment of force F about the centre of the disc, moment = N m [1] 2. the torque of the couple produced by the forces in the strings, torque = N m [1] 3. the force in S1. force = N [2]

5 © IJC 2011 8866/Prelim2 [Turn over For Examiner’s Use 2 A steady stream of water strikes a wall horizontally without rebounding, and, as a result, exerts a force on the vertical wall. (a) With reference to Newton’s Laws of motion, (i) state and explain why the momentum of the water changes as it strikes the wall, [3] (ii) explain why the water exerts a constant force on the wall. [1] (b) Water arrives at the wall at a rate of 18 kg s -1. It strikes the wall horizontally, at a speed of 7.2 m s-1 without rebounding. Calculate (i) the change in momentum of the water in one second, change in momentum = kg m s -1 [2] (ii) the force exerted by the water on the wall. force = kg m s -2 [1] (c) State and explain the effect on the magnitude of the force if the water rebounds after striking the wall. [2]

6 © IJC 2011 8866/Prelim2 [Turn over For Examiner’s Use 3 (a) What do you understand by progressive wave? [1] (b) A radar transmitter produces pulses of microwaves each with a mean power P = 2.0 MW which are emitted uniformly in all directions. A small spherical target of effective area S is placed at a distance of 50 km from the transmitter. The target reflects k of the energy incident on it uniformly in all directions as shown in Fig 3.1. Fig. 3.1 (i) Calculate the mean intensity of the emitted pulse at a range of 50 km. intensity = W m -2 [2] (ii) Given that S = 1.0 m2. Calculate the power received by a target. power = W [2] (iii) Assuming that the fraction of energy reflected is k = 0.50, calculate the mean intensity of the reflected pulse when received back at the transmitter. intensity = W m -2 [3] transmitter target 50 km

7 © IJC 2011 8866/Prelim2 [Turn over For Examiner’s Use 4 A household electric lamp is rated as 240 V, 60 W. The filament of the lamp is made from tungsten and is a wire of constant radius 6.0 x 10 6 m. The resistivity of tungsten at the normal operating temperature of the lamp is 7.9 x 107  m. (a) State Ohm’s law. [1] (b) For the lamp at its normal operating temperature, (i) calculate the current in the lamp, current = A [1] (ii) show that the resistance of the filament is 960 . [1] (c) Calculate the length of the filament. length = m [2] (d) Comment on your answer to (c). [1]

© IJC 20 5 The t chang voltme Fig. 5 resista 011 thermistor i ges in a ro o eter has inf 5.2 shows ance of the s connect e om. The bat finite resista the variat i thermistor 8 ed into the ttery of e.m ance. The va on with t e in the range 8 8866/Prelim2 circuit of F m.f. 1.50 V h alue of R is Fig. 5.1 emperature, e 12 °C to 2 Fig. 5.2 R 2 Fig. 5.1 in has negligib s given to be measure d 24 °C. order to m o ble internal e 4800 . d in degre e [T onitor tem p resistance es Celsius , urn over E perature and the , of the For Examiner’s Use

9 © IJC 2011 8866/Prelim2 [Turn over For Examiner’s Use (a) State the resistance of the thermistor when it is placed at 12 oC. resistance =  [1] (b) Deduce the reading on the voltmeter at 12 oC. reading = V [2] (c) The circuit is now placed in a room at an unknown temperature T. The voltmeter reading is 1.13 V. Find T. temperature = C [3] (d) The voltmeter is later found to be non-ideal with a resistance of 8.0 k . Find the value of the voltmeter when it is set up in Fig. 5.1 at a temperature of 12 oC. value = [2] (e) Suggest one way to ensure the reading in (d) is as close to the true reading as possible. [1]

© IJC 20 6 A car 5.0o t The l increa (a) D ( ( ( ( 011 r starts fro m to the horizo length of t h ases at a co Determine, (i) its ac (ii) the tim (iii) the ga (iv) the ga Answe m rest and ontal, as illu he road is onstant rate for this car celeration, me taken to ain in kineti ain in gravit 8 er two of th travels upw ustrated in F 450 m an d e and is 28 traveling up o travel the l c energy, tational pote 10 8866/Prelim2 Section B he questions wards along