Paper 4 May 1999 Physics
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- Words: 1,481
- Pages: 16
Centre Number
Candidate Number
Candidate Name
UNIVERSITY OF CAMBRIDGE LOCAL EXAMINATIONS SYNDICATE General Certificate of Education Ordinary Level
5054/4
PHYSICS PAPER 4 Alternative to Practical Monday
21 JUNE 1999
Morning
1 hour
Candidates answer on the question paper. Additional materials: Electronic calculator and/or Mathematical tables Protractor Ruler (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. INFORMATION FOR CANDIDATES The number of marks is given in brackets [ ] at the end of each question or part question.
FOR EXAMINER’S USE 1 2 3 4 5 TOTAL
This question paper consists of 12 printed pages and 4 blank pages. SB (SLC / JB) QF92361/1 © UCLES 1999
[Turn over
1
;
2
A metal bob attached to a length of thread is held in a clamp as shown in Fig. 1.1. The bob is made to swing by moving it to one side and then releasing it.
clamp
rule
l
1 : 23.8
thread
;
the stopwatch reads 1 min : 23.8 s
bob
Fig. 1.1
The metre rule is used to measure the distance l between the centre of the bob and the clamp. The stopwatch is used to measure the time t for 20 complete swings. In the experiment, the time for 20 swings is measured for different values of l. In each case, the time T for one swing is calculated. (a) Explain how you would use the metre rule to measure the value of l when l is about 90 cm. You should mention any additional apparatus you would use. You may draw a diagram if you wish. ..................................................................................... ..................................................................................... ..................................................................................... ..................................................................................... ..................................................................................... ..................................................................................... [3]
5054/4 S99
For Examiner’s Use
3 (b) The stopwatch shown in Fig. 1.1 can measure time to the nearest 0.1 s. One value for T was T = 1.03 s. Why is it desirable to measure the time for at least 20 swings in order to determine this value of T ?
For Examiner’s Use
.......................................................................................................................................... .......................................................................................................................................... .......................................................................................................................................... ......................................................................................................................................[2] (c) On Fig. 1.2, show the numbers on the face of the stopwatch when t = 106.6 s.
:
.
Fig. 1.2 [1]
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[Turn over
4 2
The circuit shown in Fig. 2.1 contains a thermistor which is immersed in oil. The power supply provides a constant potential difference of 2.0 V. power supply + –
A V 2.0 V thermometer
P
;;;;;;;;;;; ;;;;;;;;;;; Q oil ;;;;;;;;;;; ;;;;;;;;;;; ;;;;;;;;;;; ;;;;;;;;;;; ;;;;;;;;;;;
thermistor
heater
Fig. 2.1 (a) The table below contains some information about the thermistor. Complete the table, given that I = V/R and that V = 2.0 V. temperature of thermistor/°C resistance of thermistor/Ω
0
50
100
100
20
5.0
current through thermistor/A
0.10
5054/4 S99
[2]
For Examiner’s Use
5 (b) To measure the current, there is a choice of two ammeters X and Y. The scale on the face of each meter is shown in Fig. 2.2.
1
2
3 4
0
0
5
1
0.1
0.2
0.3
For Examiner’s Use
0.4
0.5
1
0.
AMPS
AMPS
X
Y Fig. 2.2
Which meter would you choose, given that the temperature of the oil is always between 0 °C and 100 °C? choice of meter ..................................... reason for your choice ...................................................................................................... ......................................................................................................................................[2] (c) There is a potential difference between the wires dipping into the oil. This may cause a very small current in the oil from wire P to wire Q. What could you do to the apparatus to show, experimentally, that this current is very small? .......................................................................................................................................... .......................................................................................................................................... ......................................................................................................................................[2]
5054/4 S99
[Turn over
6 3
A small steel ball is dropped through a hole in a card and falls through a clear plastic tube before hitting a glass surface, as shown in Fig. 3.1. There is a rubber band on the outside of the tube. This band may be moved along the tube. hole
card
;;
plastic tube
clamp
ball
rubber band 14.5 cm
h
glass surface t
Fig. 3.1 When the ball bounces on the glass surface, it rises up inside the tube to a height shown as h in Fig. 3.1. The top of the bounce is marked by the position of the rubber band. In one series of experiments, a ball of mass 1.0 g is dropped from the hole arranged at a fixed height of 14.5 cm above different pieces of glass. The thickness t of the glass is different for each piece of glass. The area of the top surface is the same for each piece of glass. The height h of the bounce is measured each time. The graph of Fig. 3.2 represents the results of the experiment. On the graph, the thick horizontal line, at h = 14.5 cm, represents the height of the hole.
5054/4 S99
For Examiner’s Use
For Examiner’s Use
7 15 height of hole = 14.5 cm 14 13 12 11 h / cm 10 9 8 7 6 5 4 3 2 1 0
4
8
12
16
20 t / mm
Fig. 3.2 (a) One particular piece of glass has a thickness of 20 mm. (i)
h height of bounce Determine the ratio ––––––––––––––– = –––– . 14.5 height of hole
h ratio –––– = ...................................... 14.5 (ii)
The potential energy E of the ball when at the hole is given by E = mg x height. What fraction of this energy is transferred to the glass on impact? ................................................................................................................................... [2] 5054/4 S99
[Turn over
8 (b) (i)
Describe what you would observe when the ball hits glass of thickness t = 2 mm. ................................................................................................................................... ...................................................................................................................................
(ii)
Comment on the amount of energy transferred to the glass when t = 2 mm. ................................................................................................................................... ................................................................................................................................... [3]
(c) The area of the top surface of the glass is the same for each piece of glass. As t increases, what other physical property of the glass increases? ......................................................................................................................................[1]
5054/4 S99
For Examiner’s Use
9 BLANK PAGE
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[Turn over
10 4
A hot thermometer is allowed to cool on a day when room temperature is 24.0 °C. Temperature-time observations are taken every 0.25 min (15 s). The results of the cooling experiment are shown in the graph of Fig. 4.1 on page 11. The excess temperature θ at any moment is given by
θ = temperature of the thermometer – room temperature. The excess temperature at the points A and B are
θA = 30 °C, θB = 15 °C. (a) (i)
Near to the points A and B are two broken lines. These lines are shown drawn over a time interval of 0.25 min. For each interval, determine the fall F in temperature which occurred.
fall in temperature in 0.25 min for A, FA = ................................................................. fall in temperature in 0.25 min for B, FB = ................................................................. (ii)
Determine the ratio θA/θB and the ratio FA/FB.
θA/θB = ...................................... FA/FB = ...................................... (iii)
Using the values you have obtained in (ii), write a conclusion about the rate of cooling of the thermometer and its excess temperature. In your answer, give an approximate relation between these quantities. ................................................................................................................................... ................................................................................................................................... [4]
(b) Why is it reasonable to assume that the temperature of the room did not change during the experiment? ......................................................................................................................................[1] (c) The thermometer is held inside a large beaker during the cooling. Why is this good experimental practice? ......................................................................................................................................[1]
5054/4 S99
For Examiner’s Use
11
65
temperature of thermometer °C
60
A; hA = 30 °C
55
50 time interval of 0.25 min
45
B; hB = 15 °C
40
time interval of 0.25 min
35
30
25
room temperature = 24.0 °C
20 0
0.5
1.0
1.5
2.0
2.5
3.0 time / min
3.5
Fig. 4.1
5054/4 S99
[Turn over
For Examiner’s Use
12 5
The apparatus shown in Fig. 5.1 is used in a lens experiment. object lens translucent screen image on screen rule
Fig. 5.1 The object is a triangular hole cut in a card. The image is formed on the screen. The height h of the image and the image distance v are measured for different positions of the object. The values obtained are shown in the table. v/mm
150
245
310
350
400
h/mm
10
28
43
49
61
(a) Using the grid on page 13, plot the graph of v/mm (y-axis) against h/mm (x-axis). Draw a straight line which is the best fit for the plotted points. [5] (b) The rule, shown along the side of the apparatus, is used to determine the values of v. Explain how you would avoid making a parallax error when taking these measurements. You may draw a diagram or draw on Fig. 5.1.
.......................................................................................................................................... ......................................................................................................................................[1]
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13
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14 BLANK PAGE
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15 BLANK PAGE
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16 BLANK PAGE
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Candidate Number
Candidate Name
UNIVERSITY OF CAMBRIDGE LOCAL EXAMINATIONS SYNDICATE General Certificate of Education Ordinary Level
5054/4
PHYSICS PAPER 4 Alternative to Practical Monday
21 JUNE 1999
Morning
1 hour
Candidates answer on the question paper. Additional materials: Electronic calculator and/or Mathematical tables Protractor Ruler (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. INFORMATION FOR CANDIDATES The number of marks is given in brackets [ ] at the end of each question or part question.
FOR EXAMINER’S USE 1 2 3 4 5 TOTAL
This question paper consists of 12 printed pages and 4 blank pages. SB (SLC / JB) QF92361/1 © UCLES 1999
[Turn over
1
;
2
A metal bob attached to a length of thread is held in a clamp as shown in Fig. 1.1. The bob is made to swing by moving it to one side and then releasing it.
clamp
rule
l
1 : 23.8
thread
;
the stopwatch reads 1 min : 23.8 s
bob
Fig. 1.1
The metre rule is used to measure the distance l between the centre of the bob and the clamp. The stopwatch is used to measure the time t for 20 complete swings. In the experiment, the time for 20 swings is measured for different values of l. In each case, the time T for one swing is calculated. (a) Explain how you would use the metre rule to measure the value of l when l is about 90 cm. You should mention any additional apparatus you would use. You may draw a diagram if you wish. ..................................................................................... ..................................................................................... ..................................................................................... ..................................................................................... ..................................................................................... ..................................................................................... [3]
5054/4 S99
For Examiner’s Use
3 (b) The stopwatch shown in Fig. 1.1 can measure time to the nearest 0.1 s. One value for T was T = 1.03 s. Why is it desirable to measure the time for at least 20 swings in order to determine this value of T ?
For Examiner’s Use
.......................................................................................................................................... .......................................................................................................................................... .......................................................................................................................................... ......................................................................................................................................[2] (c) On Fig. 1.2, show the numbers on the face of the stopwatch when t = 106.6 s.
:
.
Fig. 1.2 [1]
5054/4 S99
[Turn over
4 2
The circuit shown in Fig. 2.1 contains a thermistor which is immersed in oil. The power supply provides a constant potential difference of 2.0 V. power supply + –
A V 2.0 V thermometer
P
;;;;;;;;;;; ;;;;;;;;;;; Q oil ;;;;;;;;;;; ;;;;;;;;;;; ;;;;;;;;;;; ;;;;;;;;;;; ;;;;;;;;;;;
thermistor
heater
Fig. 2.1 (a) The table below contains some information about the thermistor. Complete the table, given that I = V/R and that V = 2.0 V. temperature of thermistor/°C resistance of thermistor/Ω
0
50
100
100
20
5.0
current through thermistor/A
0.10
5054/4 S99
[2]
For Examiner’s Use
5 (b) To measure the current, there is a choice of two ammeters X and Y. The scale on the face of each meter is shown in Fig. 2.2.
1
2
3 4
0
0
5
1
0.1
0.2
0.3
For Examiner’s Use
0.4
0.5
1
0.
AMPS
AMPS
X
Y Fig. 2.2
Which meter would you choose, given that the temperature of the oil is always between 0 °C and 100 °C? choice of meter ..................................... reason for your choice ...................................................................................................... ......................................................................................................................................[2] (c) There is a potential difference between the wires dipping into the oil. This may cause a very small current in the oil from wire P to wire Q. What could you do to the apparatus to show, experimentally, that this current is very small? .......................................................................................................................................... .......................................................................................................................................... ......................................................................................................................................[2]
5054/4 S99
[Turn over
6 3
A small steel ball is dropped through a hole in a card and falls through a clear plastic tube before hitting a glass surface, as shown in Fig. 3.1. There is a rubber band on the outside of the tube. This band may be moved along the tube. hole
card
;;
plastic tube
clamp
ball
rubber band 14.5 cm
h
glass surface t
Fig. 3.1 When the ball bounces on the glass surface, it rises up inside the tube to a height shown as h in Fig. 3.1. The top of the bounce is marked by the position of the rubber band. In one series of experiments, a ball of mass 1.0 g is dropped from the hole arranged at a fixed height of 14.5 cm above different pieces of glass. The thickness t of the glass is different for each piece of glass. The area of the top surface is the same for each piece of glass. The height h of the bounce is measured each time. The graph of Fig. 3.2 represents the results of the experiment. On the graph, the thick horizontal line, at h = 14.5 cm, represents the height of the hole.
5054/4 S99
For Examiner’s Use
For Examiner’s Use
7 15 height of hole = 14.5 cm 14 13 12 11 h / cm 10 9 8 7 6 5 4 3 2 1 0
4
8
12
16
20 t / mm
Fig. 3.2 (a) One particular piece of glass has a thickness of 20 mm. (i)
h height of bounce Determine the ratio ––––––––––––––– = –––– . 14.5 height of hole
h ratio –––– = ...................................... 14.5 (ii)
The potential energy E of the ball when at the hole is given by E = mg x height. What fraction of this energy is transferred to the glass on impact? ................................................................................................................................... [2] 5054/4 S99
[Turn over
8 (b) (i)
Describe what you would observe when the ball hits glass of thickness t = 2 mm. ................................................................................................................................... ...................................................................................................................................
(ii)
Comment on the amount of energy transferred to the glass when t = 2 mm. ................................................................................................................................... ................................................................................................................................... [3]
(c) The area of the top surface of the glass is the same for each piece of glass. As t increases, what other physical property of the glass increases? ......................................................................................................................................[1]
5054/4 S99
For Examiner’s Use
9 BLANK PAGE
5054/4 S99
[Turn over
10 4
A hot thermometer is allowed to cool on a day when room temperature is 24.0 °C. Temperature-time observations are taken every 0.25 min (15 s). The results of the cooling experiment are shown in the graph of Fig. 4.1 on page 11. The excess temperature θ at any moment is given by
θ = temperature of the thermometer – room temperature. The excess temperature at the points A and B are
θA = 30 °C, θB = 15 °C. (a) (i)
Near to the points A and B are two broken lines. These lines are shown drawn over a time interval of 0.25 min. For each interval, determine the fall F in temperature which occurred.
fall in temperature in 0.25 min for A, FA = ................................................................. fall in temperature in 0.25 min for B, FB = ................................................................. (ii)
Determine the ratio θA/θB and the ratio FA/FB.
θA/θB = ...................................... FA/FB = ...................................... (iii)
Using the values you have obtained in (ii), write a conclusion about the rate of cooling of the thermometer and its excess temperature. In your answer, give an approximate relation between these quantities. ................................................................................................................................... ................................................................................................................................... [4]
(b) Why is it reasonable to assume that the temperature of the room did not change during the experiment? ......................................................................................................................................[1] (c) The thermometer is held inside a large beaker during the cooling. Why is this good experimental practice? ......................................................................................................................................[1]
5054/4 S99
For Examiner’s Use
11
65
temperature of thermometer °C
60
A; hA = 30 °C
55
50 time interval of 0.25 min
45
B; hB = 15 °C
40
time interval of 0.25 min
35
30
25
room temperature = 24.0 °C
20 0
0.5
1.0
1.5
2.0
2.5
3.0 time / min
3.5
Fig. 4.1
5054/4 S99
[Turn over
For Examiner’s Use
12 5
The apparatus shown in Fig. 5.1 is used in a lens experiment. object lens translucent screen image on screen rule
Fig. 5.1 The object is a triangular hole cut in a card. The image is formed on the screen. The height h of the image and the image distance v are measured for different positions of the object. The values obtained are shown in the table. v/mm
150
245
310
350
400
h/mm
10
28
43
49
61
(a) Using the grid on page 13, plot the graph of v/mm (y-axis) against h/mm (x-axis). Draw a straight line which is the best fit for the plotted points. [5] (b) The rule, shown along the side of the apparatus, is used to determine the values of v. Explain how you would avoid making a parallax error when taking these measurements. You may draw a diagram or draw on Fig. 5.1.
.......................................................................................................................................... ......................................................................................................................................[1]
5054/4 S99
13
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14 BLANK PAGE
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15 BLANK PAGE
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16 BLANK PAGE
5054/4 S99
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