CSEC Physics · May/June 2009 · Paper 2

36 questions and parts from this paper. Open one to see it in full, then practise it on Quelpr and get it marked against the mark scheme.

1. 1(a)7 marksPlot on page 3, a graph of count rate (R) versus time (t).
2. 1(b)1 markWhat is meant by the 'half-life' of a radioactive sample?
3. 1(c)3 marksDescribe the procedure a student would use to obtain the results in Table 1. State ONE precaution.
4. 1(d)(i)6 marksFrom the graph, make TWO calculations of the half-life of the sample.
5. 1(d)(ii)2 marksFrom your results in (d) (i), calculate the mean (average) half-life.
6. 1(e)(i)6 marksEstimate the count rate of the sample after 425 s
7. 1(e)(ii)6 marksEstimate the count rate of the sample after 4 half-life periods.
8. 2(a)(i)1 markGive the difference between a 'vector quantity' and a 'scalar quantity'.
9. 2(a)(ii)6 marksComplete Table 2 by writing EACH of the physical quantities from the list below in the appropriate column: Mass, Momentum, Displacement, Heat Capacity, Temperature, Half-Life, Upthrust.
10. 2(b)(i)2 marksIn the space below, draw a velocity-time graph to represent the motion of the taxi from the moment the officer signals, to when the taxi comes to a stop.
11. 2(b)(ii)3 marksDetermine the distance travelled by the taxi from the time the police signals until the taxi stops.
12. 2(b)(iii)3 marksIf the speed limit is 80 km h⁻¹, determine whether or not the driver should receive a speeding ticket.
13. 3(a)(i)1 markWhy does Ray A travel in a straight line from the object to the observer?
14. 3(a)(ii)1 markWhat is the name given to the bending of Ray B as it approaches the hot surface?
15. 3(a)(iii)2 marksWith reference to the normal, the temperature and the density of the air, explain the direction of the bending of Ray B at Point x.
16. 3(a)(iv)2 marksThe mirage is a virtual image. With reference to Rays B and C, explain how the mirage is formed and why it is described as a virtual image.
17. 3(b)(i)a)1 markIn terms of the distances a and d, write an expression for the distance travelled by the sound pulse after reflection from the front of the skull to the sound detector
18. 3(b)(i)b)1 markIn terms of the distances a and d, write an expression for the distance travelled by the sound pulse after reflection from the back of the skull to the sound detector.
19. 3(b)(ii)a)2 marksDetermine the difference in distance travelled between the first and the second echo
20. 3(b)(ii)b)1 markDetermine the diameter, d, of the baby's skull.
21. 3(c)(i)3 marksThe object O is 100 m from the centre of the eye lens and the magnification of the eye lens is 0.005. Determine the distance of the retina from the centre of the eye lens.
22. 3(c)(ii)1 markWrite a formula for calculating the magnification of the eye lens using the object height and the image height
23. 4(a)(i)6 marksState the law of the conservation of energy.
24. 4(a)(ii)6 marksWhat is the difference between 'potential energy' and 'kinetic energy'?
25. 4(a)(iii)6 marksDoes the fact that heat is lost when work is done against friction violate the law of conservation of energy? Justify your answer.
26. 4(b)(i)9 marksIf a cyclist of mass 70 kg uses a bicycle of mass 7 kg, how much work must the cyclist do against gravity in order to ascend to 2100 m from sea level (0 m)?
27. 4(b)(ii)9 marksOne particular descent goes from 2100 m to 1600 m. Assuming the work done against friction is 90% of the potential energy change of the cyclist and the cycle, what INCREASE in speed in km/h can a rider attain by the end…
28. 4(b)(iii)9 marksWhat is the average rate of energy conversion of the cyclist and cycle if the descent in part (ii) takes 1 minute at constant speed?
29. 5(a)4 marksSketch the magnetic field associated with (i) a single bar magnet and (ii) between two strong bar magnets with their north poles facing, and in line with, each other.
30. 5(b)(i)5 marksHow is the electromotive force (e.m.f.) generated in the stationary coil?
31. 5(b)(ii)5 marksWhat ADDITIONAL component is needed to be able to charge the batteries?
32. 5(b)(iii)5 marksAt a reasonable cranking rate, the unit generates 6.2 V. Calculate the current in the circuit if the resistance is 310 Ω.
33. 5(c)(i)6 marksHow many turns are needed in the secondary winding if the voltage is stepped up from 6.2 V to 15.5 V?
34. 5(c)(ii)6 marksGiven that the current in the primary winding is 10 mA, what power is transmitted to the secondary windings if the transformer is 77% efficient?
35. 6(a)6 marksDescribe how the specific latent heat of fusion of ice can be determined using the method of mixtures.
36. 6(b)9 marksHow much heat is needed to change this 25 g of ice at 0° C to steam at 100° C?