Centre Number
Candidate Number
Candidate Name
UNIVERSITY OF CAMBRIDGE LOCAL EXAMINATIONS SYNDICATE Joint Examination for the School Certificate and General Certificate of Education Ordinary Level
5054/4
PHYSICS PAPER 4 Alternative to Practical Thursday
2 NOVEMBER 2000
1 hour
Candidates answer on the question paper. Additional materials: Electronic calculator and/or Mathematical tables Protractor Ruler (300 (300 mm)
TIME
1 hour
INSTRUCTIONS TO CANDIDATES Write your name, Centre number and candidate number in the spaces at the top of this page. Answer all questions. Write your answers in the spaces provided on the question paper. pap er. INFORMATION FOR CANDIDATES The number number of marks is given given in brackets brackets [ ] at the end of each question or part question. question.
FOR EXAMINER’S USE 1 2 3 4 5 TOTAL
This question paper consists of 8 printed pages and 4 blank pages. MML LOC 2122 4/99 QK07965 © UCLES 2000
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Fig. 1.1 shows a micrometer screw screw gauge set to measure the diameter of a steel ball.
0 5 mm
0 45 40
sleeve
Fig. Fig. 1.1 (a) The micrometer measures to the nearest 1/100th of a millimetre. Write down the value value of 1 cm + 1/100th of a millimetre as a decimal, and using the unit mm. 1 cm + 1/100 1/100th mm = ................................ mm
[1]
(b) The upper scale is calibrated in millimetres. The lower scale is marked so that its divisions are half-way between the millimetres on the upper scale. On the sleeve, there are 50 equally spaced divisions. When the sleeve turns once as indicated on Fig. 1.1, the sleeve sleeve moves 0.5 0.5 mm to the right. Explain Explain how you know that that the reading of the gauge in Fig. Fig. 1.1 is 7.94 mm.
.......................................................................................................................................... .......................................................................................................................................... .......................................................................................................................................... .............. ..................... .............. ............... ............... .............. .............. .............. .............. ............... ............... .............. .............. .............. .............. ............... ............... .......... ... [3] (c) Explain how you would find out whether the gauge has a zero error. .......................................................................................................................................... .......................................................................................................................................... .............. ..................... .............. ............... ............... .............. .............. .............. .............. ............... ............... .............. .............. .............. .............. ............... ............... .......... ... [2] 5054/4 W00
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A ray of light passes through a glass prism. The path of the ray is located by using four pins. In Fig. 2.1, a ray is incident on the side of an equilateral prism. Two Two optical pins P1 and P2 are used to mark the path of this incident ray. Two more pins P3 and P4 are used to locate the path of the emergent ray. ray. (a) On Fig. Fig. 2.1 2.1,, (i) draw neat and thin lines to show the path of the incident ray and the path of the emergent ray (label both lines), (ii) draw a line to show the path of the refracted ray through the glass (label this line). [2]
P2 P3
P1
P4
Fig. Fig. 2.1 (b)
(i) On Fig. 2.1, draw a normal at the point of incidence and also also at the point of emergence. Make your line for each normal at least 6 cm in length. (ii) Measure 1.
the angle of incidence, angle of incidence = ....................
2.
the angle of emergence, (this is the angle between the emergent ray and the normal at the point of emergence). angle of emergence = .................
(iii) Give a reason for for making the length of each normal at least 6 cm. .................................................................................................................................. [4]
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(a)
(i) Explain what is meant by by the mark “ °C ” at the upper end of a thermometer. thermometer. Your Your answer should refer to the two fixed points of the thermometer. .................................................................................................................................. .................................................................................................................................. .................................................................................................................................. (ii) State one precaution, other than avoiding parallax error, that you should take when using a school laboratory thermometer, to ensure accurate measurement of temperature. .................................................................................................................................. .................................................................................................................................. [3]
(b) Part of a thermometer is shown in Fig. 3.1. This is a full-scale diagram. diagram.
30
40
50
60
part of the thermometer reading in C °
Fig. Fig. 3.1 Complete the following sentences about using the thermometer. The smallest division on the scale represents a temperature change of ......................... The smallest change in temperature which could be estimated is .................................. ................................ .. The position of the mercury meniscus may be estimated to be ....................................... [3]
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Fig. 4.1 shows a wooden metre rule suspended from a horizontal pivot that passes through a small hole in the rule.
pivot (through a hole) d
centre of mass C
mark on metre rule direction of swing reference line Fig. Fig. 4.1 The rule is displaced as shown and, when released, swings freely. The time t , for at least 10 oscillations, is measured. The time T , for one complete oscillation, is calculated using the values for t and the number N of oscillations. The procedure is repeated and an average value T AV for T is obtained. The distance d , between the pivot and the centre of mass C, is measured. The experiment is repeated for different values of d . (a) Draw up a table in which you can record the experimental values for N , t , T , T AV and d .
[2] (b) State the relation between t , N and T . relation ............................
[1]
(c) At the bottom of the rule, a short mark is made along the centre line of the rule, as shown in Fig. 4.1. Before swinging the rule, a vertical vertical reference line is placed below this short line on the rule. Explain why the stopwatch is started and is stopped as the mark on the rule passes the vertical reference line. In your answer, refer to the speed of the bottom of the rule. .......................................................................................................................................... .............. ..................... .............. ............... ............... .............. .............. .............. .............. ............... ............... .............. .............. .............. .............. ............... ............... .......... ... [1] 5054/4 W00
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(d) The graph of T AV / s against against d / cm is a curved curved line, line, as shown in in Fig. 4.2.
6
T AV / / s s
5
4
3
2
1.5 0
5
10
15
20
25
30
35
40
45
50
d / cm / cm
Fig. Fig. 4.2 (i) At what value of d does T AV have a minimum value? d = ...........................
(ii) Estimate the value of d when T AV = 6.0 6.0 s. estimate of d = .......................................................................................................... [2] 5054/4 W00
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This experiment experiment compares the resistance per metre of two wires labelled P and Q in Fig. 5.1.
P
Q
B +
V
– jockey
A
C
l
slide wire switch
Fig. Fig. 5.1 Both P and Q are made of the same material. The lengths LP of P and LQ of Q are measured and found to be LP = 500 500 mm, 640 mm. LQ = 640
The jockey (sliding contact) is placed so that the length l of the slide wire AC is 900 900 mm. The potential difference V between B and C is read from the voltmeter. voltmeter. A further three sets of readings for l and V are taken. The values for l are between between 800 mm and and 400 mm. The voltmeter connections are now reversed and the experiment repeated for three sets of readings for l between 300 mm and 0 (zero). These readings are shown as negative readings in the row of values for V . The readings taken are given in the table. l /mm
0
10 0
300
400
580
750
900
volts V / volts
– 0.71
– 0.51
– 0.11
0.10
0.47
0.80
1.09
(a) Plot the graph of V /V (y -axis) -axis) against l / mm ( x-axis). Scale your graph so that the -axis starts at –0.80 V and ends at +1.4 V. Remember that the values will go from V -axis –0.80 V to to 0 and then up to +1.4 V. Also scale your graph so that the l-axis starts at 0 and ends at 1000 1000 mm. Draw Draw the the most most appropri appropriate ate line line throug through h the the plotte plotted d point points. s. [4] (b) From the graph, determine (i) the value V 0 for V at l = 0,
V 0 = ......................
(ii) the value V 1 for V at l = 1.00 1.00 m (1000 (1000 mm mm). ).
V 1 = ......................
[1]
(c) Calculate a value for the ratio r of the resistance resistance per metre of the wires P and Q using the equation V 1 x 500 r = –––––––– . –V 0 x 640 r = ..................
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