CSEC Physics · May/June 2015 · Paper 2

29 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)8 marksPlot a graph, on page 3, of Activity (A) versus Time (t).
2. 1(b)12 marksUsing your graph, calculate the average half-life of the sample, determined from the average of two or three values.
3. 1(c)2 marksUse the graph to determine the activity of the sample after 25 days.
4. 1(d)(i)2 marksState TWO types of radioactive emissions.
5. 1(d)(ii)1 markWhich type of radioactive emission is the most dangerous to human tissue?
6. 2(a)(i)1 markIn the box below, state the equation that relates C to c.
7. 2(a)(ii)2 marksState the name of the physical quantity that each letter represents. C: c:
8. 2(a)(iii)2 marksDistinguish between 'C' and 'c'.
9. 2(b)2 marksA substance which has a melting point of 80 °C is cooled from 90 °C to a complete solid at its melting point. Sketch a graph in Figure 1 to represent the statement above.
10. 2(c)(i)4 marksto heat the water to 100 °C
11. 2(c)(ii)3 marksto heat the water from 100 °C to steam at 100 °C.
12. 2(c)(iii)1 markto completely convert the water from 37 °C to steam at 100 °C. (Specific heat capacity of water = 4200 J kg⁻¹ K⁻¹ Specific latent heat of vaporization of water = 2.3 × 10⁶ J kg⁻¹)
13. 3(a)(i)1 markExplain what is meant by the term 'electrical resistance'.
14. 3(a)(ii)6 marksComplete Table 2 to provide information regarding electrical meters.
15. 3(b)(i)6 marksReading on A₁
16. 3(b)(ii)2 marksReading on A₂
17. 4(a)6 marksState Newton's three laws of motion.
18. 4(b)(i)3 marksCalculate the initial momentum of a 70 kg test dummy in the car before the crash.
19. 4(b)(ii)3 marksCalculate the average force exerted on the dummy by the seatbelt during the crash if the duration of the collision is 0.1 seconds.
20. 4(b)(iii)3 marksWith the removal of all protective features, the dummy was subjected to another crash test with the same initial speed. This time it was subjected to a 'lethal' decelerating force of 45 000 N. Calculate the duration of…
21. 5(a)(i)4 marksDescribe how the graph of Volume versus Temperature (in Celsius) of a gas can be used to derive the Kelvin scale?
22. 5(a)(ii)2 marksState the mathematical relationship between the Kelvin and Celsius temperature scales.
23. 5(b)(i)4 marksCalculate the volume of the gas if its pressure drops to 1 atmosphere at constant temperature.
24. 5(b)(ii)5 marksAfter resetting the piston, the gas returns to its initial pressure and volume. If the volume is now fixed while the gas is heated to 60 °C, calculate the final pressure of the gas.
25. 6(a)(i)5 marksCopy Figure 3 and draw the ray shown as it emerges on the other side of the lens and its relation to the focus. Show the principal axis and the focal length.
26. 6(a)(ii)1 markWrite, in words or symbols, the formula for the magnification of an object.
27. 6(b)(i)5 marksCalculate the position of the image formed and state on what side of the lens it is located.
28. 6(b)(ii)3 marksCalculate the magnification of the image formed.
29. 6(b)(iii)1 markIs the image formed real or virtual?