7540 01 Que 20090508
7540 01 Que 20090508
7540 01 Que 20090508
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No. 7 5 4 0 0 1
Paper Reference(s)
Physics
Ordinary Level Question Leave
Number Blank
Paper 1 1
Advice to Candidates
Write your answers neatly and in good English.
In calculations, show all the steps in your working.
Total
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Answer ALL the questions.
1. The diagram shows a lorry of mass 30 000 kg travelling at a steady speed of 25 m/s on a
horizontal road.
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(1)
(b) A car travelling in the same direction and in front of the lorry brakes sharply and
comes to a halt 20 m in front of the lorry.
(i) The lorry driver has a reaction time of 0.60 s before applying the brakes. Show,
by calculation, that the lorry does not collide with the car during this 0.60 s.
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(3)
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(c) When a driver applies the brakes, the distance travelled during braking is the braking
distance. The mass of the lorry is thirty times the mass of the car. The lorry and the
car have the same speed.
Explain why they both can have the same braking distance.
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(2) Q1
(Total 7 marks)
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2. The photograph shows the Leaning Tower of Pisa in Italy.
(a) In the 16th century Galileo Galilei is said to have experimented by dropping different
size cannonballs from the top of the tower. People thought that a heavier cannonball
would fall more quickly than a lighter one.
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(1)
(b) When such an experiment is carried out using modern timing equipment it is found
that a heavier cannonball reaches the ground slightly sooner than a lighter one.
Explain why this happens.
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(2)
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(c) A heavy cannonball is dropped from point A and takes 3.2 s to reach the ground.
Calculate the height of A above the ground.
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(2)
(d) Calculate the speed of this heavy cannonball as it hits the ground.
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(2) Q2
(Total 7 marks)
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3. The diagrams show a water manometer connected to a laboratory gas supply. The first
diagram shows the water levels in the two arms when the gas tap was closed, the second
when the gas tap had been opened.
Manometer Manometer
Water Water
(a) Why were the water levels the same in both arms when the gas tap was closed?
.......................................................................................................................................
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(1)
(b) When the gas tap was opened the levels of the water changed until there was a final
difference of 0.14 m as shown.
(i) Explain why the water levels changed when the gas tap was opened.
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(1)
(ii) Explain why the water levels stopped changing when the difference reached
0.14 m even though the gas tap was still open.
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(2)
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(c) Calculate the pressure difference due to a column of water 0.14 m high.
[Density of water = 1000 kg/m3]
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(2)
(d) Give a reason why this water manometer would be unsuitable for measuring a gas
pressure of 150 000 Pa.
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(1)
(e) What practical change could be made to this manometer to allow it to be used to
measure a pressure of 150 000 Pa?
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(1) Q3
(Total 8 marks)
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4. The photograph shows a wind turbine that generates electricity.
(b) When the power available from the wind is 150 MW, the wind turbine produces
60 MW of electrical power. Calculate the efficiency of this wind turbine.
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(2)
(c) A disadvantage of using wind turbines is that they are expensive to build. Give one
advantage of using wind turbines to generate electricity.
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(1) Q4
(Total 4 marks)
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5. The diagram shows an arrangement that can be used to investigate how the pressure of
dry air depends on temperature. The initial temperature of the water in the beaker and the
reading on the pressure gauge are recorded and then the Bunsen burner is turned on. A
number of sets of measurements are recorded.
Thermometer
Pressure gauge
Beaker
Stirrer
Dry air
(a) Give two precautions which should be taken before recording each set of readings.
1 ....................................................................................................................................
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2 ....................................................................................................................................
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(2)
(b) The initial temperature and pressure of the dry air were 27 °C and 102 kPa. Calculate
the pressure when the temperature is 77 °C.
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(3)
(c) At what temperature would the pressure of the dry air become zero?
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(1) Q5
(Total 6 marks)
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6. (a) A generator supplies current to a filament lamp.
0.6 ±
0.4 ±
0.2 ±
Current / A 0± Time / s
0
±
±
0.01 0.02 0.03 0.04
±0.2 ±
±0.4 ±
±0.6 ±
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(1)
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(2)
(c) On the diagram draw the current–time graph for a current with the same peak value
and half the frequency of the current shown above.
(2) Q6
(Total 7 marks)
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7. The diagram shows a dry cell and a metal conductor.
(a) Using the above symbols and others, complete the circuit diagram to show how the
resistance of the metal conductor could be determined.
(2)
(b) The potential difference across the metal conductor is 1.4 V and the current is
0.0020 A. Calculate the resistance of the metal conductor.
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(2)
(c) The same potential difference is applied to a metal conductor of double the length.
(d) Apart from length, state two other variables that would affect the resistance of a metal
conductor.
1 ....................................................................................................................................
2 ....................................................................................................................................
(2) Q7
(Total 7 marks)
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8. The diagram shows a transformer which provides power for a lamp. The transformer
consists of two coils wrapped around a metal core.
1000 turns
240 Va.c.
Lamp
12 V a.c.
Core
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(1)
(b) The right coil has 1000 turns. Calculate the number of turns on the left hand coil.
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(2)
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(1)
(ii) State why the core is made from magnetically soft material.
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(1) Q8
(Total 5 marks)
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9. (a) Name a source of background radiation.
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(1)
(b) The diagram shows a radioactive source with a detector placed a distance d from it.
Ratemeter
Detector
Source
d
In an experiment d was varied and the count rate in counts per minute (cpm) was
recorded. The results are shown below.
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(1)
(ii) Explain why the recorded count rate was greater at a distance of 10 cm than at a
distance of 8 cm from the source.
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(2)
(Total 6 marks)
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10. During a thunderstorm a student calculates that if she is at a distance of 1000 m from the
storm she should hear the thunder 2.90 s later than seeing the lightning flash.
(a) (i) Calculate the value of the speed of sound that she used in her calculation.
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(2)
(ii) Explain why there is a big time difference between seeing the lightning and
hearing the thunder.
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(2)
(b) The diagram shows the relative positions of the student and a tall building during a
thunderstorm.
Tall building
Lightning
Student
Using a stopwatch she records a time of 2.95 s between seeing the lightning and
hearing the thunder.
(i) Give two reasons for her recorded time being longer than her calculated time of
2.90 s.
1 .............................................................................................................................
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2 .............................................................................................................................
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(2)
(ii) She also hears a second quieter sound. Explain why she hears this second
sound.
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(1) Q10
(Total 7 marks)
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11. The diagram shows the tracks of the rays in the formation of an image by a magnifying
glass.
Lens
b
c
a
................................................................................................................................
(1)
................................................................................................................................
(1)
a b c
(1)
(ii) image distance,
a b c
(1)
(iii) object distance,
a b c
(1)
(iv) magnification.
(Total 6 marks)
TOTAL FOR PAPER: 70 MARKS
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