GCSE OCR 21st Century Science P7 Specimen Paper + Mark Scheme (Higher)

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Preview of GCSE OCR 21st Century Science P7 Specimen Paper + Mark Scheme (Higher)

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SPECIMEN H
GENERAL CERTIFICATE OF SECONDARY EDUCATION
TWENTY FIRST CENTURY SCIENCE A183/02
PHYSICS A
Unit A183: Module P7 (Higher Tier)
Candidates answer on the question paper
A calculator may be used for this paper
OCR Supplied Materials: Duration: 1 hour
None
Other Materials Required:
Pencil
Ruler (cm/mm)
Candidate Candidate
Forename Surname
Centre Number Candidate Number
INSTRUCTIONS TO CANDIDATES For Examiner's
Write your name clearly in capital letters, your Centre Number and Candidate Use
Number in the boxes above.
Max Mark
Use black ink. Pencil may be used for graphs and diagrams only.
Read each question carefully and make sure that you know what you have to do 1 10
before starting your answer. 2 10
Answer all the questions.
Write your answer to each question in the space provided, however additional 3 7
paper may be used if necessary. 4 5
INFORMATION FOR CANDIDATES 5 6
Your quality of written communication is assessed in questions marked with a 6 8
pencil (). 7 14
A list of useful relationships is printed on pages 2 and 3.
The number of marks for each question is given in brackets [ ] at the end of the TOTAL 60
question or part question.
The total number of marks for this paper is 60.
This document consists of 20 pages. Any blank pages are indicated.
© OCR 2011 [QN 600/1072/1] OCR is an exempt Charity Turn over

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TWENTY FIRST CENTURY SCIENCE DATA SHEET
Useful Relationships
The Earth in the Universe
distance = wave speed x time
wave speed = frequency x wavelength
Sustainable Energy
energy transferred = power x time
power = voltage x current
energy usefully transferred
efficiency = x 100%
total energy supplied
Explaining Motion
distance travelled
speed =
time taken
change in velocity
acceleration =
time taken
momentum = mass x velocity
change of momentum = resultant force x time for which it acts
work done by a force…read more

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Observing the Universe
1
lens power =
focal length
focal length of objective lens
magnification =
focal length of eyepiece lens
speed of recession = Hubble constant x distance
pressure × volume = constant
pressure
= constant
temperature
volume
= constant
temperature
energy = mass x [speed of light in a vacuum]2
© OCR 2011 SPECIMEN Turn over…read more

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Answer all the questions.
1 The photograph shows stars forming.
SciencePhotoLibrary R590/049
(a) When a large amount of gas in space is compressed a star is formed.
As the gas compresses the temperature of the gas increases.
As the temperature increases, the pressure in the gas changes.
Explain how the pressure changes.
Your answer should include
what happens to the pressure
how the behaviour of the particles of the gas changes.
...............................................................................................................................................
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..........................................................................................................................................…read more

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When the temperature is high enough, nuclei can fuse together to form new elements. This
releases energy.
(i) Complete the equation for this fusion reaction with the names of the elements.
4 ................................................... ......................................... + energy
[2]
(ii) Describe how energy is released inside the Sun and transferred from the centre of the
Sun into space.
Your answer should include the energy process happening.
You should write about the processes in the correct order.…read more

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In the 1950s there were two main theories about how the Universe began.
(a) Here are some astronomical statements.
Each statement agrees with what is being said by Ryle, or by Hoyle, or by both of them, or
by neither of them.
Put a tick () in the correct box after each statement.
statement Ryle Hoyle both neither
In the past, all the galaxies would
have been close together.
There is no pattern in the age of
galaxies.
The Universe will eventually stop
expanding.…read more

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The graph shows the speed at which some galaxies are moving away from the Earth.
in km/s 70000
60000
in km/s
50000
Earth
Earth
40000
from
from
30000
away
away
20000
velocity
velocity
10000
0
0 100 200 300 400 500 600 700 800 900 1000
distance
distance from Earth
from in Mpc
Earth in Mpc
(i) Describe the relationship shown by the graph.
.............................................................................................................................................
......................................................................................................................................... [1]
(ii) Use data from the graph to calculate a value for the Hubble constant.
Hubble constant = ........................................…read more

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The Hubble constant is used to calculate the distance to galaxies.
How does decreasing the Hubble constant affect the distances calculated for distant
galaxies?
Explain your answer.
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.........................................................................................................................................…read more

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The diagram shows the stages in the life of a low mass star such as the Sun.
Complete the labels for the different stages on the diagram.
The Sun as it appears now has been done for you.…read more

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Complete and label a similar diagram for the later stages in the life of a star with very high
mass.…read more

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