CSEC Physics · 1992 · Paper 2

35 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)3 marksIdentify air, mercury, and aluminium as good or poor thermal and electrical conductors by writing 'GOOD' or 'POOR' in the spaces provided.
2. 1(b)(i)1 markIndicate on the diagram by means of an arrow, the direction of heat flow between the mixture and the ice/salt.
3. 1(b)(ii)2 marksExplain why the inner container is made of a good thermal conductor while the outer container is made of a poor thermal conductor.
4. 1(c)(i)3 marks0.30 kg of ice at 0 °C is placed in a container. Calculate how much energy is required to completely melt the ice. (Specific latent heat of fusion of ice = 3.3 x 10^5 J kg^-1)
5. 1(c)(ii)3 marksCalculate how much energy is required to raise the temperature of the melted ice to 15 °C. (Specific heat capacity of water = 4.2 x 10^3 J kg^-1 K^-1)
6. 1(c)(iii)4 marksSome water at 30 °C is added to 0.30 kg of ice at 0 °C. The ice melts and the final temperature of all the water is 15 °C. Use your answers to (i) and (ii) above to determine the mass of water added.
7. 2(i)2 marksA student suggests artificial satellites can remain in orbit because they have escaped the earth's gravity. Explain why these satellites would not stay in orbit if the student's suggestion were correct.
8. 2(ii)3 marksA weather satellite orbits at a height of 800 km above the surface of the earth. Calculate the time taken for radio waves to arrive at the earth's surface after being transmitted from the satellite. (Speed of…
9. 2(iii)3 marksIf the mass of the satellite is 27 kg, what is the gain in gravitational potential energy by the satellite as it is lifted from the earth's surface to its orbital height? (Assume that there is no change in the force of…
10. 2(iv)5 marksIf the satellite takes 100 minutes to complete one revolution of the earth, calculate its speed and kinetic energy given that the length of its orbit is 4.5 x 10^7 m.
11. 2(v)3 marksThe radio signal is received from the satellite by an aerial with a concave parabolic reflector. With the aid of a diagram, explain why a parabolic reflector is used.
12. 3(a)(i)1 markName the scientist referred to in the statement about the total amount of mass-energy remaining constant.
13. 3(a)(ii)3 marksGive the equation for the mass-energy relationship in a nuclear reaction. State clearly what EACH symbol represents.
14. 3(b)(i)1 markWhat is the total mass of the uranium nucleus and the neutron?
15. 3(b)(ii)2 marksWhat is the total mass of the two nuclei and the two neutrons produced as a result of the fission of 235_92 U?
16. 3(b)(iii)3 marksHow much energy is produced as a result of the fission reaction? (Speed of light = 3.0 x 10^8 m s^-1)
17. 3(c)(i)2 marksState TWO DISADVANTAGES of generating electrical energy using nuclear fission reactors.
18. 3(c)(ii)4 marksScientists estimate that every second the sun's mass is reduced by 4 x 10^9 kg. Name and explain the process that leads to this reduction in mass.
19. 4(a)(i)4 marksWrite in the name of the components labelled A, B, C and D on the dotted lines provided.
20. 4(a)(ii)1 markThe terminals X and Y are connected to a 2 Ω resistor. The peak value of the potential difference is 4 V. Calculate the peak value of the output current.
21. 4(a)(iii)3 marksThe coil makes 10 revolutions in one second. On the axes provided, sketch a graph to represent the variation of output current with time during the first two revolutions of the coil. Indicate the scale used on EACH axis.
22. 4(a)(iv)1 markIf the number of turns of wire on the coil is increased, with no other change, state the effect, if any, on the frequency of the output current.
23. 4(a)(v)1 markIf the number of turns of wire on the coil is increased, with no other change, state the effect, if any, on the peak value of the output current.
24. 4(a)(vi)1 markIf instead of increasing the number of turns of wire, the speed of rotation of the coil is increased with no other change, state the effect, if any, on the frequency of the output current.
25. 4(a)(vii)1 markIf instead of increasing the number of turns of wire, the speed of rotation of the coil is increased with no other change, state the effect, if any, on the peak value of the output current.
26. 4(b)4 marksA mechanic states that a transformer cannot be used with the d.c. dynamo to obtain a higher potential difference as transformers work only with alternating current. State whether the mechanic is correct and explain your…
27. 5(a)(i)2 marksDraw the waves after they have passed through the gap.
28. 5(a)(ii)1 markWhat name is given to this effect?
29. 5(b)(i)2 marksFrom the information given for the squawker in the table, calculate the velocity of sound.
30. 5(b)(ii)2 marksDetermine the missing frequency range and insert it in the table above.
31. 5(b)(iii)1 markAn observer notices that when she stands at X, she hears equally well from the three speakers. However, when she stands at Y, she hears mainly from one speaker and much less from the others. From which speaker does she…
32. 5(b)(iv)2 marksWith reference to the data in the table and diagram on page 10, give an explanation for her observations while at Y.
33. 5(c)(i)2 marksCompare the loudness and pitch of waveforms P and Q.
34. 5(c)(ii)2 marksCompare the loudness and pitch of waveforms Q and R.
35. 5(c)(iii)2 marksExplain in what other way sounds P and Q differ.