CSEC Physics · 1991 · Paper 2

27 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)(i)3 marksCalculate the energy consumption of the refrigerator per month.
2. 1(a)(ii)3 marksAssuming 1 month = 30 days, determine the average power consumption of the refrigerator in watts.
3. 1(b)(i)3 marksState the names of each of the three pins.
4. 1(b)(ii)2 marksExplain why the manufacturer insists the earth/third pin must not be removed, even though the refrigerator functions with two pins.
5. 1(c)5 marksGiven the refrigerator volume of 0.40 m³, air density of 1.29 kg m⁻³, specific heat capacity of air of 600 J kg⁻¹ K⁻¹, and 1 kW h = 3.6 × 10⁶ J, calculate the electrical energy in kilowatt-hours needed to cool the air…
6. 2(a)(i)2 marksDescribe what is seen through the microscope when observing the illuminated graphite particles for a few seconds.
7. 2(a)(ii)1 markState what change in observation would occur if warmer water were used instead.
8. 2(a)(iii)2 marksState the conclusions that can be drawn from these observations.
9. 2(b)3 marksThe average speed of a perfume molecule at room temperature is approximately 100 m/s, but the scent travels across a room much more slowly. Explain this difference.
10. 2(c)(i)2 marksExplain why adding more air into a car tyre increases its internal pressure.
11. 2(c)(ii)2 marksExplain why the pressure in a car tyre increases when it gets hot.
12. 2(d)4 marksNitrous oxide gas inside a cylinder exerts a pressure of 5.0 × 10⁵ Pa at 17 °C. Calculate its new pressure when heated to 37 °C before use.
13. 3(a)4 marksComplete the statement of Newton's 1st Law: 'An object remains at rest...' and Newton's 3rd Law: 'If an object A exerts a force on object B...'
14. 3(b)2 marksUse Newton's first law to explain why a passenger on a bus falls forward when the bus stops suddenly.
15. 3(c)(i)2 marksOn the provided diagram of the Moon orbiting Earth, draw the force or forces acting on the Moon.
16. 3(c)(ii)2 marksExplain how Newton's third law applies in this case.
17. 3(d)(i)3 marksDraw on the diagram the force or forces acting on the ball at point A and at point B.
18. 3(d)(ii)3 marksState the magnitude of the acceleration of the ball at point A and at point B.
19. 4(a)(i)2 marksDetermine the number of neutrons and the number of protons in this nuclide.
20. 4(a)(ii)2 marksAn electron is represented as ⁰₋₁e. Explain whether a mass number of 0 implies that the electron has zero mass.
21. 4(b)5 marksComplete the balanced nuclear equation for the alpha decay of uranium-238 to thorium-234, and the subsequent beta decay of thorium-234 to protactinium (symbol Pa).
22. 4(c)(i)5 marksPlot a graph on the grid showing the decay of the 8.00 g mass over a period of 15 days.
23. 4(c)(ii)1 markUsing the graph or calculation, determine how much of the radioactive material remains after 5 days.
24. 4(c)(iii)1 markDetermine the mass of the material remaining after 9 days if the external pressure were increased by a factor of 10.
25. 5(a)4 marksIdentify the parts of the eye labelled A, B, C, and D.
26. 5(b)4 marksThe eye shown in Figure 4 is long-sighted. Draw rays on the diagram to illustrate how the converging lens corrects this defect.
27. 5(c)8 marksComplete the scale ray drawing to determine the position and magnification of the image.